feat: redesign installer on MTK toolkit with component selection

Rewrite the Installer app on the Montauk Toolkit (Canvas + gui/mtk
widgets, theme, hover states, scrollbar) replacing the hand-rolled px_*
renderer and bespoke TrueType usage.

Add a new "Software" step: an expandable checkbox tree for optional
components (Montauk SDK with gcc/g++, binutils, tcc, lua sub-items;
Games; Office; Internet apps; Printing; experimental httpd and SDR).
Unchecked components' paths are excluded from the install copy, with a
longest-path ownership rule so e.g. sdk/tcc installs even when the rest
of the SDK is deselected. The update flow refreshes only the components
the target already has.

Add tri-state checkbox and disclosure-arrow widgets to the MTK toolkit
(anti-aliased, supersampled).

Merge tcc and lua into 0:/sdk (0:/sdk/tcc, 0:/sdk/lua) and drop 0:/lib:
update tcc config.h, lua luaconf.h, both Makefiles, the devkit clean
scope, man pages and montaukos.org notices.

Make printing optional: init skips printd when 0:/os/printd.elf is
absent.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

kernel/src/Api/BuildNo.hpp

@@ -12,4 +12,4 @@
 
 #pragma once
 
-#define MONTAUK_BUILD_NUMBER 29
+#define MONTAUK_BUILD_NUMBER 31

montaukos.org/THIRD-PARTY-NOTICES.txt

@@ -252,7 +252,7 @@ exception, is included on the MontaukOS ISO at 0:/os/licenses/AGPL-3.0-C059.txt.
 10. Tiny C Compiler (TCC)
 ================================================================================
 Shipped as the bundled C compiler (tcc.elf) with its runtime libraries and
-headers on the ISO (0:/lib/tcc/). MontaukOS ships a modified version of TCC
+headers on the ISO (0:/sdk/tcc/). MontaukOS ships a modified version of TCC
 0.9.28rc, ported to target MontaukOS (added platform startup/compatibility
 code and a MontaukOS sysroot).
 
@@ -281,7 +281,7 @@ License: GNU Lesser General Public License, version 2.1 (LGPL-2.1)
 11. Lua
 ================================================================================
 Shipped as the bundled Lua interpreter (lua.elf), Lua 5.4.8, with its static
-library and headers on the ISO (0:/lib/lua/).
+library and headers on the ISO (0:/sdk/lua/).
 
 License: MIT License
 

montaukos.org/docs/man/legal.html

@@ -153,9 +153,9 @@
     * Roboto font, Copyright The Roboto Project Authors - OFL-1.1
     * C059 font (URW Base 35), Copyright (C) (URW)++ Design and Development
       GmbH - AGPLv3 with font-embedding exception
-    * Tiny C Compiler (tcc.elf, 0:/lib/tcc), Copyright (c) Fabrice Bellard and
+    * Tiny C Compiler (tcc.elf, 0:/sdk/tcc), Copyright (c) Fabrice Bellard and
       contributors - LGPL-2.1
-    * Lua (lua.elf, 0:/lib/lua), Copyright (C) Lua.org, PUC-Rio - MIT
+    * Lua (lua.elf, 0:/sdk/lua), Copyright (C) Lua.org, PUC-Rio - MIT
     * Mozilla CA certificate bundle (0:/os/certs), Mozilla CA Certificate
       Program - MPL-2.0
     * Intel Bluetooth firmware (0:/os/firmware/intel), Copyright (c) Intel

programs/GNUmakefile

@@ -295,11 +295,11 @@ gen-syscalls:
 # check-syscalls guards against shipping a stale C API header into the ramdisk.
 tcc: libc check-syscalls
 	$(MAKE) -C src/tcc
-	mkdir -p $(BINDIR)/lib/tcc/include
+	mkdir -p $(BINDIR)/sdk/tcc/include
-	cp -r src/tcc/tcc_include/* $(BINDIR)/lib/tcc/include/
+	cp -r src/tcc/tcc_include/* $(BINDIR)/sdk/tcc/include/
-	cp include/libc/*.h $(BINDIR)/lib/tcc/include/
+	cp include/libc/*.h $(BINDIR)/sdk/tcc/include/
-	mkdir -p $(BINDIR)/lib/tcc/include/sys
+	mkdir -p $(BINDIR)/sdk/tcc/include/sys
-	cp include/libc/sys/*.h $(BINDIR)/lib/tcc/include/sys/
+	cp include/libc/sys/*.h $(BINDIR)/sdk/tcc/include/sys/
 
 # Build Lua interpreter and static library (depends on libc).
 lua: libc
@@ -388,7 +388,10 @@ DEVKIT_TOOLS := as ld ar nm objcopy objdump readelf ranlib strip size strings ad
 .PHONY: devkit
 devkit: libc
 ifneq ($(wildcard $(NATIVE_BIN)/as),)
-	rm -rf $(BINDIR)/sdk
+	# Clean only the devkit-owned subtrees; sdk/tcc and sdk/lua are
+	# installed into bin/sdk/ by their own targets.
+	rm -rf $(BINDIR)/sdk/bin $(BINDIR)/sdk/lib $(BINDIR)/sdk/include \
+	       $(BINDIR)/sdk/libexec $(BINDIR)/sdk/x86_64-montauk
 	mkdir -p $(BINDIR)/sdk/bin $(BINDIR)/sdk/lib $(BINDIR)/sdk/include
 	for t in $(DEVKIT_TOOLS); do \
 	    cp $(NATIVE_BIN)/$$t $(BINDIR)/sdk/bin/$$t.elf || exit 1; \

programs/include/gui/mtk/widgets.hpp

@@ -942,6 +942,217 @@ inline void draw_radio(Canvas& c,
            label, theme.text);
 }
 
+// ============================================================================
+// Checkboxes and disclosure arrows
+// ============================================================================
+
+enum CheckState : uint8_t {
+    CHECK_OFF = 0,
+    CHECK_ON,
+    CHECK_MIXED,
+};
+
+inline CheckState check_state(bool checked) {
+    return checked ? CHECK_ON : CHECK_OFF;
+}
+
+inline Rect checkbox_indicator_rect(const Rect& option, int size = 16) {
+    return {option.x, option.y + (option.h - size) / 2, size, size};
+}
+
+// Coverage-based pixel blend used by the anti-aliased checkbox drawing.
+// `cov` is 0..255; the destination is treated as opaque.
+inline void checkbox_blend_px(Canvas& c, int x, int y, Color color, int cov) {
+    if (x < 0 || x >= c.w || y < 0 || y >= c.h || cov <= 0) return;
+    if (cov > 255) cov = 255;
+    uint32_t dst = c.pixels[y * c.w + x];
+    uint32_t dr = (dst >> 16) & 0xFF, dg = (dst >> 8) & 0xFF, db = dst & 0xFF;
+    uint32_t a = (uint32_t)cov, ia = 255 - a;
+    uint32_t nr = (color.r * a + dr * ia + 127) / 255;
+    uint32_t ng = (color.g * a + dg * ia + 127) / 255;
+    uint32_t nb = (color.b * a + db * ia + 127) / 255;
+    c.pixels[y * c.w + x] = 0xFF000000u | (nr << 16) | (ng << 8) | nb;
+}
+
+// Point (px, py) inside a rounded rect of size w x h with corner radius r,
+// evaluated in the rect's local coordinate space.
+inline bool round_rect_contains(double px, double py, double w, double h, double r) {
+    if (px < 0 || py < 0 || px > w || py > h) return false;
+    double rx = 0, ry = 0;
+    bool corner = false;
+    if (px < r && py < r)              { rx = r - px;         ry = r - py;         corner = true; }
+    else if (px > w - r && py < r)     { rx = px - (w - r);   ry = r - py;         corner = true; }
+    else if (px < r && py > h - r)     { rx = r - px;         ry = py - (h - r);   corner = true; }
+    else if (px > w - r && py > h - r) { rx = px - (w - r);   ry = py - (h - r);   corner = true; }
+    if (!corner) return true;
+    return rx * rx + ry * ry <= r * r;
+}
+
+// Anti-aliased rounded-rect fill via 4x4 supersampling. Kept local to the
+// checkbox so the rest of the toolkit's crisp fills are unchanged.
+inline void checkbox_fill_round_aa(Canvas& c, const Rect& box, double radius, Color color) {
+    if (box.w <= 0 || box.h <= 0) return;
+    if (radius < 0) radius = 0;
+    const int S = 4;
+    for (int row = -1; row <= box.h; row++) {
+        int py = box.y + row;
+        if (py < 0 || py >= c.h) continue;
+        for (int col = -1; col <= box.w; col++) {
+            int px = box.x + col;
+            if (px < 0 || px >= c.w) continue;
+            int hits = 0;
+            for (int sy = 0; sy < S; sy++)
+                for (int sx = 0; sx < S; sx++) {
+                    double fx = col + (sx + 0.5) / S;
+                    double fy = row + (sy + 0.5) / S;
+                    if (round_rect_contains(fx, fy, box.w, box.h, radius)) hits++;
+                }
+            if (hits) checkbox_blend_px(c, px, py, color, hits * 255 / (S * S));
+        }
+    }
+}
+
+// Squared distance from a point to a line segment (no sqrt; used for the
+// thickness test of the checkmark strokes).
+inline double checkbox_seg_dist2(double px, double py,
+                                 double ax, double ay, double bx, double by) {
+    double dx = bx - ax, dy = by - ay;
+    double len2 = dx * dx + dy * dy;
+    double t = len2 > 0 ? ((px - ax) * dx + (py - ay) * dy) / len2 : 0.0;
+    if (t < 0) t = 0; else if (t > 1) t = 1;
+    double ex = px - (ax + t * dx), ey = py - (ay + t * dy);
+    return ex * ex + ey * ey;
+}
+
+// Anti-aliased two-stroke checkmark via 4x4 supersampling of a fixed-width
+// polyline.
+inline void draw_check_mark(Canvas& c, const Rect& box, Color color) {
+    double ax = box.x + box.w * 0.24, ay = box.y + box.h * 0.50;
+    double bx = box.x + box.w * 0.42, by = box.y + box.h * 0.68;
+    double cx = box.x + box.w * 0.74, cy = box.y + box.h * 0.26;
+    double hw = box.w * 0.085 + 0.35;   // half stroke width
+    double hw2 = hw * hw;
+    const int S = 4;
+    for (int py = box.y - 1; py <= box.y + box.h + 1; py++) {
+        if (py < 0 || py >= c.h) continue;
+        for (int px = box.x - 1; px <= box.x + box.w + 1; px++) {
+            if (px < 0 || px >= c.w) continue;
+            int hits = 0;
+            for (int sy = 0; sy < S; sy++)
+                for (int sx = 0; sx < S; sx++) {
+                    double fx = px + (sx + 0.5) / S;
+                    double fy = py + (sy + 0.5) / S;
+                    double d1 = checkbox_seg_dist2(fx, fy, ax, ay, bx, by);
+                    double d2 = checkbox_seg_dist2(fx, fy, bx, by, cx, cy);
+                    if ((d1 < d2 ? d1 : d2) <= hw2) hits++;
+                }
+            if (hits) checkbox_blend_px(c, px, py, color, hits * 255 / (S * S));
+        }
+    }
+}
+
+inline void draw_checkbox(Canvas& c,
+                          const Rect& option,
+                          const char* label,
+                          CheckState state,
+                          const Theme& theme,
+                          bool enabled = true,
+                          bool hovered = false) {
+    Rect box = checkbox_indicator_rect(option);
+    double radius = box.w * 0.22;
+
+    Color fill, border, mark;
+    if (!enabled) {
+        fill = theme.disabled_bg;
+        border = theme.disabled_bg;
+        mark = theme.disabled_fg;
+    } else if (state == CHECK_OFF) {
+        fill = colors::WHITE;
+        border = hovered ? theme.accent : theme.border;
+        mark = theme.accent_fg;
+    } else {
+        fill = hovered ? theme.accent_hover : theme.accent;
+        border = fill;
+        mark = theme.accent_fg;
+    }
+
+    if (state == CHECK_OFF) {
+        // Colored ring with a white interior.
+        checkbox_fill_round_aa(c, box, radius, border);
+        Rect inner = {box.x + 1, box.y + 1, box.w - 2, box.h - 2};
+        checkbox_fill_round_aa(c, inner, radius - 1, fill);
+    } else {
+        checkbox_fill_round_aa(c, box, radius, fill);
+    }
+
+    if (state == CHECK_ON) {
+        draw_check_mark(c, box, mark);
+    } else if (state == CHECK_MIXED) {
+        Rect dash = {box.x + 4, box.y + box.h / 2 - 1, box.w - 8, 2};
+        checkbox_fill_round_aa(c, dash, 1, mark);
+    }
+
+    if (label && label[0]) {
+        int fh = system_font_height();
+        c.text(box.x + box.w + theme.gap_sm,
+               option.y + (option.h - fh) / 2,
+               label, enabled ? theme.text : theme.text_muted);
+    }
+}
+
+inline Rect disclosure_rect(const Rect& option, int size = 16) {
+    return {option.x, option.y + (option.h - size) / 2, size, size};
+}
+
+inline void draw_disclosure(Canvas& c,
+                            const Rect& box,
+                            bool expanded,
+                            const Theme& theme,
+                            bool hovered = false) {
+    Color color = hovered ? theme.text : theme.text_subtle;
+    double cx = box.x + box.w / 2.0;
+    double cy = box.y + box.h / 2.0;
+    double s = box.w * 0.26;
+    if (s < 3) s = 3;
+
+    // Triangle vertices (equilateral-ish), rotated per state.
+    double vx[3], vy[3];
+    if (expanded) {           // pointing down
+        vx[0] = cx - s;     vy[0] = cy - s * 0.6;
+        vx[1] = cx + s;     vy[1] = cy - s * 0.6;
+        vx[2] = cx;         vy[2] = cy + s * 0.75;
+    } else {                  // pointing right
+        vx[0] = cx - s * 0.6; vy[0] = cy - s;
+        vx[1] = cx - s * 0.6; vy[1] = cy + s;
+        vx[2] = cx + s * 0.75; vy[2] = cy;
+    }
+
+    // Anti-aliased fill via 4x4 supersampling of the triangle's half-plane test.
+    auto edge = [](double ax, double ay, double bx, double by, double px, double py) {
+        return (px - ax) * (by - ay) - (py - ay) * (bx - ax);
+    };
+    const int S = 4;
+    for (int py = box.y; py < box.y + box.h; py++) {
+        if (py < 0 || py >= c.h) continue;
+        for (int px = box.x; px < box.x + box.w; px++) {
+            if (px < 0 || px >= c.w) continue;
+            int hits = 0;
+            for (int sy = 0; sy < S; sy++)
+                for (int sx = 0; sx < S; sx++) {
+                    double fx = px + (sx + 0.5) / S;
+                    double fy = py + (sy + 0.5) / S;
+                    double e0 = edge(vx[0], vy[0], vx[1], vy[1], fx, fy);
+                    double e1 = edge(vx[1], vy[1], vx[2], vy[2], fx, fy);
+                    double e2 = edge(vx[2], vy[2], vx[0], vy[0], fx, fy);
+                    bool inside = (e0 >= 0 && e1 >= 0 && e2 >= 0) ||
+                                  (e0 <= 0 && e1 <= 0 && e2 <= 0);
+                    if (inside) hits++;
+                }
+            if (hits) checkbox_blend_px(c, px, py, color, hits * 255 / (S * S));
+        }
+    }
+}
+
 inline Rect swatch_rect(int row_x, int row_y, int index, int size = 24, int gap = 6) {
     return {row_x + index * (size + gap), row_y, size, size};
 }

programs/man/intro.1

@@ -52,13 +52,14 @@
         0:/icons/       Shared icons
         0:/man/         Manual pages
         0:/www/         Web server content
-        0:/lib/         Lua and TinyCC toolchain payloads
+        0:/sdk/         Montauk SDK (native gcc/binutils, TinyCC,
+                        Lua, headers and libraries), when installed
         0:/boot/        Kernel, bootloader, ramdisk image
 
     There is no 0:/games/, 0:/common/, 0:/home/, or 0:/etc/ --
     these were used by earlier single-user releases and no longer
-    exist. Games and other GUI programs (including doom) ship as
+    exist. 0:/lib/ was merged into 0:/sdk/. Games and other GUI
-    bundles under 0:/apps/.
+    programs (including doom) ship as bundles under 0:/apps/.
 
 .SH SHELL
     The interactive shell is the primary way to interact with

programs/man/legal.7

@@ -46,9 +46,9 @@
     * Roboto font, Copyright The Roboto Project Authors - OFL-1.1
     * C059 font (URW Base 35), Copyright (C) (URW)++ Design and Development
       GmbH - AGPLv3 with font-embedding exception
-    * Tiny C Compiler (tcc.elf, 0:/lib/tcc), Copyright (c) Fabrice Bellard and
+    * Tiny C Compiler (tcc.elf, 0:/sdk/tcc), Copyright (c) Fabrice Bellard and
       contributors - LGPL-2.1
-    * Lua (lua.elf, 0:/lib/lua), Copyright (C) Lua.org, PUC-Rio - MIT
+    * Lua (lua.elf, 0:/sdk/lua), Copyright (C) Lua.org, PUC-Rio - MIT
     * Mozilla CA certificate bundle (0:/os/certs), Mozilla CA Certificate
       Program - MPL-2.0
     * Intel Bluetooth firmware (0:/os/firmware/intel), Copyright (c) Intel

programs/src/init/main.cpp

@@ -124,6 +124,13 @@ static void log_err(const char* msg)  { log(LOG_ERR, msg); }
 
 // ---- Service runner ----
 
+static bool service_installed(const char* path) {
+    int fd = montauk::open(path);
+    if (fd < 0) return false;
+    montauk::close(fd);
+    return true;
+}
+
 static bool run_service(const char* path, const char* name, bool wait = true) {
     char msg[128];
 
@@ -156,7 +163,12 @@ extern "C" void _start() {
 
     // ---- Stage 1: Network configuration (non-blocking) ----
     run_service("0:/os/dhcp.elf", "dhcp", false);
+
+    // Printing is an optional install component; skip quietly when absent.
+    if (service_installed("0:/os/printd.elf"))
         run_service("0:/os/printd.elf", "print spooler", false);
+    else
+        log_info("Print spooler not installed, skipping");
 
     // ---- Stage 2: Login screen -> desktop (falls back to desktop, then shell) ----
     if (!run_service("0:/os/login.elf", "login")) {

programs/src/installer/Makefile

@@ -52,7 +52,7 @@ LDFLAGS := \
 
 # ---- Source files ----
 
-SRCS := main.cpp render.cpp actions.cpp stb_truetype_impl.cpp
+SRCS := main.cpp render.cpp actions.cpp components.cpp stb_truetype_impl.cpp
 OBJS := $(addprefix $(OBJDIR)/,$(SRCS:.cpp=.o))
 
 # ---- Target ----

programs/src/installer/actions.cpp

@@ -81,6 +81,96 @@ static void path_join(char* out, int outsize, const char* dir, const char* name)
     out[i] = '\0';
 }
 
+static const char* rel_basename(const char* rel) {
+    const char* base = rel;
+    for (int i = 0; rel[i]; i++)
+        if (rel[i] == '/') base = rel + i + 1;
+    return base;
+}
+
+// ============================================================================
+// Filesystem probes and heap-backed directory listing
+// ============================================================================
+
+bool installer_path_exists(const char* abs_path) {
+    int fd = montauk::open(abs_path);
+    if (fd >= 0) {
+        montauk::close(fd);
+        return true;
+    }
+    const char* names[4];
+    return montauk::readdir_at(abs_path, names, 4, 0) >= 0;
+}
+
+void installer_free_dir_list(DirList* list) {
+    if (!list) return;
+    for (int i = 0; i < list->count; i++)
+        montauk::mfree(list->entries[i].rel);
+    montauk::mfree(list->entries);
+    list->entries = nullptr;
+    list->count = 0;
+}
+
+// The kernel serves readdir strings from a small ring of scratch pages, so
+// nested listings invalidate earlier results. Copy each batch to the heap
+// and page with readdir_at so directories of any size enumerate fully.
+bool installer_list_dir(const char* abs_dir, DirList* out) {
+    out->entries = nullptr;
+    out->count = 0;
+
+    static constexpr int BATCH = 128;
+    const char* batch[BATCH];
+
+    int scanned = 0;
+    int capacity = 0;
+
+    int got = montauk::readdir_at(abs_dir, batch, BATCH, 0);
+    if (got < 0) return false;
+
+    while (got > 0) {
+        for (int i = 0; i < got; i++) {
+            const char* raw = batch[i];
+            int len = slen(raw);
+
+            bool is_dir = (len > 0 && raw[len - 1] == '/');
+            if (is_dir) len--;
+            if (len <= 0) continue;
+
+            // Skip "." and ".."
+            const char* base = raw;
+            for (int k = 0; k < len; k++)
+                if (raw[k] == '/') base = raw + k + 1;
+            int base_len = (int)(len - (base - raw));
+            if (base_len == 1 && base[0] == '.') continue;
+            if (base_len == 2 && base[0] == '.' && base[1] == '.') continue;
+
+            if (out->count >= capacity) {
+                int new_cap = capacity ? capacity * 2 : 64;
+                DirEntry* grown = (DirEntry*)montauk::malloc(new_cap * sizeof(DirEntry));
+                if (!grown) { installer_free_dir_list(out); return false; }
+                for (int k = 0; k < out->count; k++) grown[k] = out->entries[k];
+                montauk::mfree(out->entries);
+                out->entries = grown;
+                capacity = new_cap;
+            }
+
+            char* rel = (char*)montauk::malloc(len + 1);
+            if (!rel) { installer_free_dir_list(out); return false; }
+            montauk::memcpy(rel, raw, len);
+            rel[len] = '\0';
+
+            out->entries[out->count].rel = rel;
+            out->entries[out->count].is_dir = is_dir;
+            out->count++;
+        }
+
+        scanned += got;
+        got = montauk::readdir_at(abs_dir, batch, BATCH, scanned);
+    }
+
+    return true;
+}
+
 // ============================================================================
 // Copy a single file from src_path to dst_path
 // ============================================================================
@@ -159,113 +249,78 @@ static bool copy_file(const char* src_path, const char* dst_path) {
 static int g_files_copied;
 static int g_dirs_created;
 
-// Copy all entries from src_dir (on ramdisk) to dst_dir (on target drive).
+// Copy all entries from src_dir (on ramdisk) to dst_dir (on target drive),
+// honoring the component selection: paths owned by an unchecked component
+// are skipped, and directories are still entered when a checked component
+// lives deeper inside (e.g. sdk/tcc with the rest of sdk deselected).
 // If skip_toplevel is non-null, skip that directory name at the top level.
 static bool copy_recursive(const char* src_dir, const char* dst_dir,
                             const char* skip_toplevel = nullptr) {
-    const char* names[256];
+    DirList list;
-    int count = montauk::readdir(src_dir, names, 256);
+    if (!installer_list_dir(src_dir, &list))
-    if (count < 0) return true; // not a directory or empty, skip
+        return true; // not a directory, skip
 
-    // Ramdisk readdir returns names relative to the drive root with the
+    bool ok = true;
-    // full internal path (e.g., for readdir("0:/os"), names come back as
-    // "os/init.elf", "os/shell.elf", etc.).  We need to strip the prefix
-    // that corresponds to the local path portion of src_dir.
-    //
-    // Find the local path after the "N:/" prefix.
-    const char* src_local = src_dir;
-    for (int k = 0; src_local[k]; k++) {
-        if (src_local[k] == ':') {
-            src_local += k + 1;
-            if (src_local[0] == '/') src_local++;
-            break;
-        }
-    }
-    int prefix_len = slen(src_local);
-    // If prefix is non-empty, we also skip the trailing '/'
-    if (prefix_len > 0 && src_local[prefix_len - 1] != '/') prefix_len++;
 
-    for (int i = 0; i < count; i++) {
+    for (int i = 0; i < list.count && ok; i++) {
-        const char* raw_name = names[i];
+        const char* rel = list.entries[i].rel;
+        const char* base = rel_basename(rel);
 
-        // Strip prefix to get basename
+        char src_path[256];
-        const char* basename = raw_name;
+        snprintf(src_path, sizeof(src_path), "0:/%s", rel);
-        if (prefix_len > 0 && slen(raw_name) > prefix_len) {
-            basename = raw_name + prefix_len;
-        }
-
-        // Skip "." and ".."
-        if (basename[0] == '.' && (basename[1] == '\0' || basename[1] == '/')) continue;
-        if (basename[0] == '.' && basename[1] == '.' && (basename[2] == '\0' || basename[2] == '/')) continue;
-
-        int blen = slen(basename);
-
-        // Check if this is a directory (trailing '/')
-        bool is_dir = (blen > 0 && basename[blen - 1] == '/');
-
-        if (is_dir) {
-            // Strip trailing '/' for the name
-            char dir_name[256];
-            int j = 0;
-            for (; j < blen - 1 && j < 255; j++) dir_name[j] = basename[j];
-            dir_name[j] = '\0';
 
+        if (list.entries[i].is_dir) {
             // Skip the installer app — no need on the installed system
-            if (strcmp(dir_name, "installer") == 0 &&
+            if (strcmp(rel, "apps/installer") == 0) continue;
-                strcmp(src_local, "apps") == 0) continue;
 
             // Skip requested top-level directory
-            if (skip_toplevel && strcmp(dir_name, skip_toplevel) == 0) continue;
+            if (skip_toplevel && strcmp(base, skip_toplevel) == 0) continue;
+
+            bool allowed = component_allows(rel);
+            if (!allowed && !component_subtree_needed(rel)) continue;
 
-            // Create directory on target
             char target_path[256];
-            path_join(target_path, sizeof(target_path), dst_dir, dir_name);
+            path_join(target_path, sizeof(target_path), dst_dir, base);
 
             montauk::fmkdir(target_path);
             g_dirs_created++;
 
             char log_msg[64];
-            snprintf(log_msg, sizeof(log_msg), "  mkdir %s", dir_name);
+            snprintf(log_msg, sizeof(log_msg), "  mkdir %s", base);
             add_log(log_msg);
             flush_ui();
 
-            // Recurse into this directory
+            ok = copy_recursive(src_path, target_path);
-            char src_subdir[256];
-            path_join(src_subdir, sizeof(src_subdir), src_dir, dir_name);
-
-            if (!copy_recursive(src_subdir, target_path))
-                return false;
         } else {
             // Skip ramdisk and limine.conf — installed system boots from
             // disk and gets a fresh config without the ramdisk module.
             // Skip setup.toml — live/setup environment config that should
             // not be present on the installed system.
-            if (strcmp(basename, "ramdisk.tar") == 0) continue;
+            if (strcmp(base, "ramdisk.tar") == 0) continue;
-            if (strcmp(basename, "limine.conf") == 0) continue;
+            if (strcmp(base, "limine.conf") == 0) continue;
-            if (strcmp(basename, "setup.toml") == 0) continue;
+            if (strcmp(base, "setup.toml") == 0) continue;
 
-            // It's a file — copy it
+            if (!component_allows(rel)) continue;
-            char src_path[256];
-            // Build source path: drive prefix + raw_name (which is the full internal path)
-            // src_dir starts with "0:/" so we need "0:/" + raw_name
-            snprintf(src_path, sizeof(src_path), "0:/%s", raw_name);
 
             char dst_path[256];
-            path_join(dst_path, sizeof(dst_path), dst_dir, basename);
+            path_join(dst_path, sizeof(dst_path), dst_dir, base);
 
             char log_msg[64];
-            snprintf(log_msg, sizeof(log_msg), "  copy %s", basename);
+            snprintf(log_msg, sizeof(log_msg), "  copy %s", base);
             add_log(log_msg);
             flush_ui();
 
-            if (!copy_file(src_path, dst_path))
+            if (!copy_file(src_path, dst_path)) {
-                return false;
+                ok = false;
+                break;
+            }
 
             g_files_copied++;
         }
     }
 
-    return true;
+    installer_free_dir_list(&list);
+    return ok;
 }
 
 // ============================================================================
@@ -412,8 +467,7 @@ static void install_efi_ext2(int disk) {
     add_log("  Mounted");
     flush_ui();
 
-    char efi_root[8], ext2_root[8];
+    char ext2_root[8];
-    snprintf(efi_root, sizeof(efi_root), "%d:/", efi_drive);
     snprintf(ext2_root, sizeof(ext2_root), "%d:/", root_drive);
 
     // Step 8: Create EFI boot directory structure
@@ -705,13 +759,14 @@ void do_update() {
         add_log("ERROR: Mount failed");
         flush_ui(); st.step = STEP_ERROR; return;
     }
-
-    char drive_root[8];
-    snprintf(drive_root, sizeof(drive_root), "%d:/", drive_num);
     add_log("  Mounted");
     flush_ui();
 
-    // Step 2: Update os/ — remove old and copy fresh
+    // Step 2: Detect which optional components the target has, so the
+    // update refreshes those without re-adding deselected ones.
+    components_set_from_target(drive_num);
+
+    // Step 3: Update os/ — overwrite existing and add new
     add_log("Updating os/...");
     flush_ui();
 
@@ -724,7 +779,7 @@ void do_update() {
         flush_ui(); st.step = STEP_ERROR; return;
     }
 
-    // Step 3: Update apps/ — copy all, overwriting existing and adding new
+    // Step 4: Update apps/ — copy all, overwriting existing and adding new
     add_log("Updating apps/...");
     flush_ui();
 
@@ -736,17 +791,19 @@ void do_update() {
         flush_ui(); st.step = STEP_ERROR; return;
     }
 
-    // Step 4: Update lib/ — compiler runtime, headers, libc
+    // Step 5: Update sdk/ — dev tools, headers, tcc, lua
-    add_log("Updating lib/...");
+    if (component_allows("sdk") || component_subtree_needed("sdk")) {
+        add_log("Updating sdk/...");
         flush_ui();
 
-    snprintf(path_buf, sizeof(path_buf), "%d:/lib", drive_num);
+        snprintf(path_buf, sizeof(path_buf), "%d:/sdk", drive_num);
         montauk::fmkdir(path_buf);
 
-    if (!copy_recursive("0:/lib", path_buf)) {
+        if (!copy_recursive("0:/sdk", path_buf)) {
-        add_log("ERROR: Failed to update lib/");
+            add_log("ERROR: Failed to update sdk/");
             flush_ui(); st.step = STEP_ERROR; return;
         }
+    }
 
     char copy_msg[64];
     snprintf(copy_msg, sizeof(copy_msg), "  %d files, %d directories updated",

programs/src/installer/components.cpp

@@ -0,0 +1,439 @@
+/*
+ * components.cpp
+ * MontaukOS Installer — optional component selection
+ * Copyright (c) 2026 Daniel Hammer
+ */
+
+#include "installer.h"
+
+// ============================================================================
+// Component table
+// ============================================================================
+
+enum ComponentIndex {
+    CI_SDK = 0,
+    CI_GCC,
+    CI_BINUTILS,
+    CI_TCC,
+    CI_LUA,
+    CI_GAMES,
+    CI_DOOM,
+    CI_2048,
+    CI_RPGDEMO,
+    CI_MANDELBROT,
+    CI_OFFICE,
+    CI_WORDPROCESSOR,
+    CI_SPREADSHEET,
+    CI_PDFVIEWER,
+    CI_INTERNET,
+    CI_WIKIPEDIA,
+    CI_WEATHER,
+    CI_IRC,
+    CI_PRINTING,
+    CI_HTTPD,
+    CI_SDR,
+    CI_COUNT,
+};
+
+Component g_components[] = {
+    { "sdk", "Montauk SDK",
+      "Native development kit under 0:/sdk: headers, libc, libstdc++ and tools",
+      -1, "sdk/include", {"sdk", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "gcc", "GNU C/C++ compiler (gcc, g++)",
+      "Native GCC 14 with C and C++ support (needs binutils)",
+      CI_SDK, "sdk/bin/gcc.elf",
+      {"sdk/bin/gcc.elf", "sdk/bin/g++.elf", "sdk/bin/cpp.elf",
+       "sdk/libexec", "sdk/lib/gcc", nullptr},
+      true, CI_BINUTILS,
+      false, false, false, false, 0 },
+
+    { "binutils", "GNU binutils (as, ld, ar, ...)",
+      "Assembler, linker and object file tools",
+      CI_SDK, "sdk/bin/as.elf",
+      {"sdk/bin/as.elf", "sdk/bin/ld.elf", "sdk/bin/ar.elf", "sdk/bin/nm.elf",
+       "sdk/bin/objcopy.elf", "sdk/bin/objdump.elf", "sdk/bin/readelf.elf",
+       "sdk/bin/ranlib.elf", "sdk/bin/strip.elf", "sdk/bin/size.elf",
+       "sdk/bin/strings.elf", "sdk/bin/addr2line.elf", "sdk/bin/c++filt.elf",
+       "sdk/bin/elfedit.elf", nullptr},
+      true, -1,
+      false, false, false, false, 0 },
+
+    { "tcc", "Tiny C Compiler",
+      "Lightweight single-pass C compiler (tcc) with its own headers",
+      CI_SDK, "sdk/tcc", {"sdk/tcc", "os/tcc.elf", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "lua", "Lua 5.4",
+      "Lua interpreter (lua) with static library and headers",
+      CI_SDK, "sdk/lua", {"sdk/lua", "os/lua.elf", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "games", "Games & demos",
+      "Games and graphics demos",
+      -1, nullptr, {nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "doom", "DOOM",
+      "id Software's DOOM on the doomgeneric engine",
+      CI_GAMES, "apps/doom", {"apps/doom", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "2048", "2048",
+      "Sliding tile puzzle game",
+      CI_GAMES, "apps/2048", {"apps/2048", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "rpgdemo", "RPG demo",
+      "Top-down RPG game engine demo",
+      CI_GAMES, "apps/rpgdemo", {"apps/rpgdemo", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "mandelbrot", "Mandelbrot",
+      "Fractal explorer",
+      CI_GAMES, "apps/mandelbrot", {"apps/mandelbrot", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "office", "Office & productivity",
+      "Document, spreadsheet and PDF applications",
+      -1, nullptr, {nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "wordprocessor", "Word Processor",
+      "Rich text documents with printing support",
+      CI_OFFICE, "apps/wordprocessor", {"apps/wordprocessor", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "spreadsheet", "Spreadsheet",
+      "Formula-based spreadsheet",
+      CI_OFFICE, "apps/spreadsheet", {"apps/spreadsheet", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "pdfviewer", "PDF Viewer",
+      "PDF document viewer",
+      CI_OFFICE, "apps/pdfviewer", {"apps/pdfviewer", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "internet", "Internet apps",
+      "Optional network applications",
+      -1, nullptr, {nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "wikipedia", "Wikipedia",
+      "Wikipedia reader (GUI app and wiki CLI)",
+      CI_INTERNET, "apps/wikipedia", {"apps/wikipedia", "os/wiki.elf", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "weather", "Weather",
+      "Weather forecast app",
+      CI_INTERNET, "apps/weather", {"apps/weather", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "irc", "IRC client",
+      "Command-line IRC client",
+      CI_INTERNET, "os/irc.elf", {"os/irc.elf", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "printing", "Printing support",
+      "Print spooler daemon (printd), printer setup app and print tools",
+      -1, "os/printd.elf",
+      {"os/printd.elf", "os/printctl.elf", "os/printersapplet.lib",
+       "apps/printers", nullptr},
+      false, -1,
+      false, false, false, false, 0 },
+
+    { "httpd", "HTTP server (experimental)",
+      "Experimental web server (httpd) with 0:/www content",
+      -1, "os/httpd.elf", {"os/httpd.elf", "www", nullptr}, false, -1,
+      false, false, false, false, 0 },
+
+    { "sdr", "SDR tools (experimental)",
+      "RTL-SDR software defined radio demo (sdr CLI)",
+      -1, "os/sdr.elf", {"os/sdr.elf", nullptr}, false, -1,
+      false, false, false, false, 0 },
+};
+
+const int g_component_count = CI_COUNT;
+
+static bool g_sizes_ready = false;
+
+// ============================================================================
+// Helpers
+// ============================================================================
+
+static bool comp_is_group(int idx) {
+    return g_components[idx].paths[0] == nullptr;
+}
+
+bool component_has_children(int idx) {
+    for (int i = 0; i < g_component_count; i++)
+        if (g_components[i].parent == idx) return true;
+    return false;
+}
+
+// True when rel equals prefix or lies inside the prefix directory.
+static bool path_under(const char* prefix, const char* rel) {
+    int pl = 0;
+    while (prefix[pl]) {
+        if (rel[pl] != prefix[pl]) return false;
+        pl++;
+    }
+    return rel[pl] == '\0' || rel[pl] == '/';
+}
+
+static int str_len(const char* s) {
+    int n = 0;
+    while (s[n]) n++;
+    return n;
+}
+
+// Component owning rel, resolved by the longest matching owned path. This is
+// what lets "sdk/tcc" stay installable while the rest of "sdk" is skipped.
+static int component_owning(const char* rel) {
+    int best = -1, best_len = -1;
+    for (int i = 0; i < g_component_count; i++) {
+        for (int p = 0; g_components[i].paths[p]; p++) {
+            const char* path = g_components[i].paths[p];
+            if (!path_under(path, rel)) continue;
+            int len = str_len(path);
+            if (len > best_len) { best_len = len; best = i; }
+        }
+    }
+    return best;
+}
+
+bool component_allows(const char* rel) {
+    int owner = component_owning(rel);
+    return owner < 0 || g_components[owner].checked;
+}
+
+bool component_subtree_needed(const char* rel) {
+    int rel_len = str_len(rel);
+    for (int i = 0; i < g_component_count; i++) {
+        if (!g_components[i].checked) continue;
+        for (int p = 0; g_components[i].paths[p]; p++) {
+            const char* path = g_components[i].paths[p];
+            if (str_len(path) > rel_len && path_under(rel, path)) return true;
+        }
+    }
+    return false;
+}
+
+// ============================================================================
+// Presence detection and defaults
+// ============================================================================
+
+static bool rel_exists(const char* rel) {
+    char abs[160];
+    snprintf(abs, sizeof(abs), "0:/%s", rel);
+    return installer_path_exists(abs);
+}
+
+void components_init() {
+    for (int i = 0; i < g_component_count; i++) {
+        Component& c = g_components[i];
+        c.expanded = false;
+        c.bytes = 0;
+        c.base_present = c.probe ? rel_exists(c.probe) : false;
+        c.present = c.base_present;
+        c.checked = c.base_present;
+    }
+
+    // A parent counts as present when its own payload or any child exists.
+    for (int i = 0; i < g_component_count; i++) {
+        int p = g_components[i].parent;
+        if (p >= 0 && g_components[i].present)
+            g_components[p].present = true;
+    }
+
+    g_sizes_ready = false;
+}
+
+// ============================================================================
+// Check state and toggling
+// ============================================================================
+
+mtk::CheckState component_state(int idx) {
+    const Component& c = g_components[idx];
+    if (!component_has_children(idx))
+        return mtk::check_state(c.checked);
+
+    int total = 0, on = 0;
+    if (c.base_present) { total++; if (c.checked) on++; }
+    for (int i = 0; i < g_component_count; i++) {
+        if (g_components[i].parent != idx || !g_components[i].present) continue;
+        total++;
+        if (g_components[i].checked) on++;
+    }
+
+    if (total == 0 || on == 0) return mtk::CHECK_OFF;
+    if (on == total) return mtk::CHECK_ON;
+    return mtk::CHECK_MIXED;
+}
+
+void component_toggle(int idx) {
+    Component& c = g_components[idx];
+    if (!c.present) return;
+
+    if (component_has_children(idx)) {
+        bool on = component_state(idx) != mtk::CHECK_ON;
+        c.checked = on && c.base_present;
+        for (int i = 0; i < g_component_count; i++) {
+            if (g_components[i].parent == idx && g_components[i].present)
+                g_components[i].checked = on;
+        }
+        return;
+    }
+
+    c.checked = !c.checked;
+
+    if (c.checked) {
+        if (c.depends_on >= 0 && g_components[c.depends_on].present)
+            g_components[c.depends_on].checked = true;
+        if (c.requires_parent && c.parent >= 0 &&
+            g_components[c.parent].base_present)
+            g_components[c.parent].checked = true;
+    } else {
+        // Drop anything that declared a dependency on this component.
+        for (int i = 0; i < g_component_count; i++) {
+            if (g_components[i].depends_on == idx)
+                g_components[i].checked = false;
+        }
+    }
+}
+
+int component_visible_rows(int* out, int max) {
+    int count = 0;
+    for (int i = 0; i < g_component_count && count < max; i++) {
+        int p = g_components[i].parent;
+        if (p >= 0 && !g_components[p].expanded) continue;
+        out[count++] = i;
+    }
+    return count;
+}
+
+// ============================================================================
+// Size measurement
+// ============================================================================
+
+static uint64_t file_size_abs(const char* abs) {
+    int fd = montauk::open(abs);
+    if (fd < 0) return 0;
+    uint64_t size = montauk::getsize(fd);
+    montauk::close(fd);
+    return size;
+}
+
+// Recursive size of rel, counting only entries owned by component `owner`
+// (entries claimed by a more specific component are counted there instead).
+static uint64_t du_walk(const char* rel, int owner) {
+    if (component_owning(rel) != owner) return 0;
+
+    char abs[192];
+    snprintf(abs, sizeof(abs), "0:/%s", rel);
+
+    DirList list;
+    if (installer_list_dir(abs, &list)) {
+        uint64_t sum = 0;
+        for (int i = 0; i < list.count; i++)
+            sum += du_walk(list.entries[i].rel, owner);
+        installer_free_dir_list(&list);
+        return sum;
+    }
+
+    return file_size_abs(abs);
+}
+
+void components_compute_sizes() {
+    if (g_sizes_ready) return;
+
+    for (int i = 0; i < g_component_count; i++) {
+        Component& c = g_components[i];
+        c.bytes = 0;
+        if (!c.present || comp_is_group(i)) continue;
+        for (int p = 0; c.paths[p]; p++)
+            c.bytes += du_walk(c.paths[p], i);
+    }
+
+    // Pure groups display the sum of their children.
+    for (int i = 0; i < g_component_count; i++) {
+        if (!comp_is_group(i)) continue;
+        for (int j = 0; j < g_component_count; j++)
+            if (g_components[j].parent == i)
+                g_components[i].bytes += g_components[j].bytes;
+    }
+
+    g_sizes_ready = true;
+}
+
+bool components_sizes_ready() {
+    return g_sizes_ready;
+}
+
+uint64_t components_selected_bytes() {
+    uint64_t sum = 0;
+    for (int i = 0; i < g_component_count; i++) {
+        if (comp_is_group(i)) continue;
+        if (g_components[i].checked) sum += g_components[i].bytes;
+    }
+    return sum;
+}
+
+uint64_t components_unselected_bytes() {
+    uint64_t sum = 0;
+    for (int i = 0; i < g_component_count; i++) {
+        if (comp_is_group(i)) continue;
+        if (g_components[i].present && !g_components[i].checked)
+            sum += g_components[i].bytes;
+    }
+    return sum;
+}
+
+// ============================================================================
+// Summaries and the update flow
+// ============================================================================
+
+void components_excluded_summary(char* buf, int bufsize) {
+    int excluded = 0;
+    int named = 0;
+    int pos = 0;
+    buf[0] = '\0';
+
+    for (int i = 0; i < g_component_count; i++) {
+        if (comp_is_group(i)) continue;
+        if (!g_components[i].present || g_components[i].checked) continue;
+        excluded++;
+        if (named < 3) {
+            pos += snprintf(buf + pos, bufsize - pos, "%s%s",
+                            named ? ", " : "Skipping: ",
+                            g_components[i].label);
+            named++;
+        }
+    }
+
+    if (excluded == 0) {
+        snprintf(buf, bufsize, "All optional components selected");
+    } else if (excluded > named) {
+        snprintf(buf + pos, bufsize - pos, " (+%d more)", excluded - named);
+    }
+}
+
+// For the update flow: refresh only the optional components the target
+// already has; never re-add ones that were deselected at install time.
+void components_set_from_target(int drive) {
+    for (int i = 0; i < g_component_count; i++) {
+        Component& c = g_components[i];
+        if (!c.probe) continue;
+        char abs[160];
+        snprintf(abs, sizeof(abs), "%d:/%s", drive, c.probe);
+        c.checked = c.present && installer_path_exists(abs);
+
+        // Migration: pre-sdk installs kept tcc/lua under 0:/lib.
+        if (!c.checked && c.present &&
+            (strcmp(c.id, "tcc") == 0 || strcmp(c.id, "lua") == 0)) {
+            snprintf(abs, sizeof(abs), "%d:/lib/%s", drive, c.id);
+            c.checked = installer_path_exists(abs);
+        }
+    }
+}

programs/src/installer/installer.h

@@ -10,7 +10,8 @@
 #include <montauk/string.h>
 #include <montauk/heap.h>
 #include <gui/gui.hpp>
-#include <gui/truetype.hpp>
+#include <gui/font.hpp>
+#include <gui/mtk.hpp>
 
 extern "C" {
 #include <string.h>
@@ -23,34 +24,20 @@ using namespace gui;
 // Constants
 // ============================================================================
 
-static constexpr int INIT_W       = 520;
+static constexpr int INIT_W       = 560;
-static constexpr int INIT_H       = 440;
+static constexpr int INIT_H       = 500;
-static constexpr int TOOLBAR_H    = 36;
+static constexpr int HEADER_H     = 44;
-static constexpr int STEP_BAR_H   = 32;
+static constexpr int STEP_BAR_H   = 30;
-static constexpr int CONTENT_TOP  = TOOLBAR_H + STEP_BAR_H;
+static constexpr int CONTENT_TOP  = HEADER_H + STEP_BAR_H;
+static constexpr int BOTTOM_H     = 48;
+static constexpr int PAD          = 16;
+static constexpr int BTN_H        = 30;
 static constexpr int MAX_DISKS    = 32;
 static constexpr int MAX_PARTS    = 32;
-static constexpr int STATUS_H     = 26;
 
-// Font sizes — adjusted at runtime by apply_scale()
+static constexpr int COMP_ROW_H      = 28;
-extern int FONT_SIZE;
+static constexpr int COMP_INDENT     = 26;
-extern int FONT_SM;
+static constexpr int COMP_TOGGLE_W   = 18;
-
-static constexpr int TB_BTN_Y     = 5;
-static constexpr int TB_BTN_H     = 26;
-static constexpr int TB_BTN_RAD   = 8;
-
-static constexpr Color BG_COLOR       = Color::from_rgb(0xFF, 0xFF, 0xFF);
-static constexpr Color TOOLBAR_BG     = Color::from_rgb(0xF5, 0xF5, 0xF5);
-static constexpr Color BORDER_COLOR   = Color::from_rgb(0xCC, 0xCC, 0xCC);
-static constexpr Color TEXT_COLOR     = Color::from_rgb(0x22, 0x22, 0x22);
-static constexpr Color DIM_TEXT       = Color::from_rgb(0x66, 0x66, 0x66);
-static constexpr Color FAINT_TEXT     = Color::from_rgb(0x88, 0x88, 0x88);
-static constexpr Color WHITE          = Color::from_rgb(0xFF, 0xFF, 0xFF);
-static constexpr Color ACCENT         = Color::from_rgb(0x33, 0x66, 0xCC);
-static constexpr Color DANGER         = Color::from_rgb(0xCC, 0x33, 0x33);
-static constexpr Color SUCCESS_COLOR  = Color::from_rgb(0x33, 0x99, 0x33);
-static constexpr Color DISABLED_BG    = Color::from_rgb(0xBB, 0xBB, 0xBB);
 
 // ============================================================================
 // Install steps
@@ -65,6 +52,7 @@ enum InstallStep {
     STEP_MODE_SELECT,
     STEP_SELECT_DISK,
     STEP_PARTITION_SCHEME,
+    STEP_COMPONENTS,
     STEP_CONFIRM,
     STEP_INSTALLING,
     STEP_DONE,
@@ -95,6 +83,55 @@ static const char* scheme_descs[] = {
     "One partition for boot, OS, and data. Simple and compatible.",
 };
 
+// ============================================================================
+// Optional components
+// ============================================================================
+
+static constexpr int MAX_COMPONENT_PATHS = 16;
+
+struct Component {
+    const char* id;
+    const char* label;
+    const char* desc;      // shown in the status bar on hover
+    int parent;            // index of parent component, or -1 for top level
+    // Path that identifies this component in an image / on a target drive.
+    const char* probe;
+    // Files or directories (relative to the drive root, no "0:/" prefix)
+    // owned by this component; nullptr-terminated. Empty for pure groups.
+    const char* paths[MAX_COMPONENT_PATHS];
+    // A child that needs its parent's base payload (e.g. gcc needs the
+    // SDK sysroot). Checking it re-checks the parent.
+    bool requires_parent;
+    // Another component this one cannot work without (e.g. gcc drives the
+    // binutils assembler/linker), or -1.
+    int depends_on;
+
+    // Runtime state
+    bool checked;
+    bool expanded;         // parents only
+    bool present;          // this component (or a child) exists in the image
+    bool base_present;     // own probe exists (parents with own payload)
+    uint64_t bytes;        // exclusive payload size in the source image
+};
+
+extern Component g_components[];
+extern const int g_component_count;
+
+// components.cpp
+void components_init();
+void components_compute_sizes();
+bool component_has_children(int idx);
+mtk::CheckState component_state(int idx);
+void component_toggle(int idx);
+int  component_visible_rows(int* out, int max);
+bool component_allows(const char* rel);
+bool component_subtree_needed(const char* rel);
+void components_set_from_target(int drive);
+uint64_t components_selected_bytes();
+uint64_t components_unselected_bytes();
+void components_excluded_summary(char* buf, int bufsize);
+bool components_sizes_ready();
+
 // ============================================================================
 // State
 // ============================================================================
@@ -120,8 +157,12 @@ struct InstallerState {
     char log[LOG_LINES][LOG_LINE_LEN];
     int  log_count;
 
-    char status[80];
+    char status[96];
     uint64_t status_time;
+
+    int mouse_x;
+    int mouse_y;
+    int comp_scroll;
 };
 
 // ============================================================================
@@ -130,10 +171,68 @@ struct InstallerState {
 
 extern int g_win_w, g_win_h;
 extern InstallerState g_state;
-extern TrueTypeFont* g_font;
+extern Color g_accent;
-extern uint32_t* g_pixels;
+
-extern uint32_t* g_backbuf;
+// ============================================================================
-extern int g_win_id;
+// Shared layout helpers
+// ============================================================================
+
+inline int content_x() { return PAD; }
+inline int content_w() { return g_win_w - PAD * 2; }
+inline int content_bottom() { return g_win_h - BOTTOM_H; }
+
+// Heading block: title line + smaller subtitle line
+inline int heading_bottom() {
+    return CONTENT_TOP + 14 + system_font_height() * 2 + 16;
+}
+
+inline Rect bottom_bar_rect() {
+    return {0, g_win_h - BOTTOM_H, g_win_w, BOTTOM_H};
+}
+
+inline Rect primary_btn_rect() {
+    int y = g_win_h - BOTTOM_H + (BOTTOM_H - BTN_H) / 2;
+    return {g_win_w - PAD - 108, y, 108, BTN_H};
+}
+
+inline Rect secondary_btn_rect() {
+    Rect p = primary_btn_rect();
+    return {p.x - 8 - 96, p.y, 96, BTN_H};
+}
+
+inline Rect tertiary_btn_rect() {
+    Rect s = secondary_btn_rect();
+    return {s.x - 8 - 84, s.y, 84, BTN_H};
+}
+
+// Mode select cards
+inline Rect mode_card_rect(int index) {
+    int card_h = 56;
+    int y = heading_bottom() + index * (card_h + 10);
+    return {content_x(), y, content_w(), card_h};
+}
+
+// Disk / partition / scheme list rows
+inline Rect list_row_rect(int index, int row_h) {
+    int y = heading_bottom() + index * (row_h + 6);
+    return {content_x(), y, content_w(), row_h};
+}
+
+static constexpr int DISK_ROW_H   = 48;
+static constexpr int SCHEME_ROW_H = 50;
+static constexpr int PART_ROW_H   = 48;
+
+// Component tree viewport
+inline Rect components_list_rect() {
+    int top = heading_bottom();
+    return {content_x(), top, content_w(), content_bottom() - top - 8};
+}
+
+inline Rect component_row_rect(int visible_index) {
+    Rect list = components_list_rect();
+    return {list.x, list.y + visible_index * COMP_ROW_H - g_state.comp_scroll,
+            list.w, COMP_ROW_H};
+}
 
 // ============================================================================
 // Function declarations — helpers (main.cpp)
@@ -143,7 +242,7 @@ void set_status(const char* msg);
 void add_log(const char* msg);
 void flush_ui();
 void format_disk_size(char* buf, int bufsize, uint64_t sectors, uint16_t sectorSize);
-void apply_scale(int scale);
+void format_bytes(char* buf, int bufsize, uint64_t bytes);
 
 // ============================================================================
 // Function declarations — render.cpp
@@ -159,3 +258,21 @@ void installer_refresh_disks();
 void installer_refresh_parts();
 void do_install();
 void do_update();
+bool installer_path_exists(const char* abs_path);
+
+// Heap-backed directory listing. Entries are full paths relative to the
+// drive root (e.g. "apps/doom"), with is_dir derived from the trailing '/'
+// the VFS appends to directory names. Survives nested listings, unlike the
+// kernel's rotating readdir scratch pages.
+struct DirEntry {
+    char* rel;      // path relative to drive root, no trailing '/'
+    bool is_dir;
+};
+
+struct DirList {
+    DirEntry* entries;
+    int count;
+};
+
+bool installer_list_dir(const char* abs_dir, DirList* out);
+void installer_free_dir_list(DirList* list);

programs/src/installer/main.cpp

@@ -5,6 +5,7 @@
  */
 
 #include "installer.h"
+#include <gui/mtk/settings.hpp>
 #include <gui/standalone.hpp>
 
 // ============================================================================
@@ -14,23 +15,10 @@
 int g_win_w = INIT_W;
 int g_win_h = INIT_H;
 
-int FONT_SIZE = 18;
-int FONT_SM   = 14;
-
 InstallerState g_state;
-TrueTypeFont* g_font = nullptr;
+Color g_accent = colors::ACCENT;
-uint32_t* g_pixels = nullptr;
-uint32_t* g_backbuf = nullptr;
-int g_win_id = -1;
-static WsWindow g_window;
 
-void apply_scale(int scale) {
+static WsWindow g_window;
-    switch (scale) {
-    case 0: FONT_SIZE = 14; FONT_SM = 11; break;
-    case 2: FONT_SIZE = 22; FONT_SM = 17; break;
-    default: FONT_SIZE = 18; FONT_SM = 14; break;
-    }
-}
 
 // ============================================================================
 // Helpers
@@ -38,7 +26,8 @@ void apply_scale(int scale) {
 
 void set_status(const char* msg) {
     int i = 0;
-    for (; i < 79 && msg[i]; i++) g_state.status[i] = msg[i];
+    for (; i < (int)sizeof(g_state.status) - 1 && msg[i]; i++)
+        g_state.status[i] = msg[i];
     g_state.status[i] = '\0';
     g_state.status_time = montauk::get_milliseconds();
 }
@@ -58,9 +47,8 @@ void add_log(const char* msg) {
 }
 
 void flush_ui() {
-    if (g_pixels && g_backbuf && g_window.id >= 0) {
+    if (g_window.pixels && g_window.id >= 0) {
-        render(g_backbuf);
+        render(g_window.pixels);
-        montauk::memcpy(g_pixels, g_backbuf, g_win_w * g_win_h * 4);
         g_window.present();
     }
 }
@@ -71,13 +59,95 @@ void format_disk_size(char* buf, int bufsize, uint64_t sectors, uint16_t sectorS
     if (gb >= 1024) {
         uint64_t tb = gb / 1024;
         uint64_t frac = ((gb % 1024) * 10) / 1024;
-        snprintf(buf, bufsize, "%lu.%lu TB", (unsigned)tb, (unsigned)frac);
+        snprintf(buf, bufsize, "%lu.%lu TB", (unsigned long)tb, (unsigned long)frac);
     } else if (gb > 0) {
         uint64_t frac = ((bytes % (1024ULL * 1024 * 1024)) * 10) / (1024ULL * 1024 * 1024);
-        snprintf(buf, bufsize, "%lu.%lu GB", (unsigned)gb, (unsigned)frac);
+        snprintf(buf, bufsize, "%lu.%lu GB", (unsigned long)gb, (unsigned long)frac);
     } else {
         uint64_t mb = bytes / (1024ULL * 1024);
-        snprintf(buf, bufsize, "%lu MB", (unsigned)mb);
+        snprintf(buf, bufsize, "%lu MB", (unsigned long)mb);
+    }
+}
+
+void format_bytes(char* buf, int bufsize, uint64_t bytes) {
+    if (bytes >= 1024ULL * 1024 * 1024) {
+        uint64_t gb = bytes / (1024ULL * 1024 * 1024);
+        uint64_t frac = ((bytes % (1024ULL * 1024 * 1024)) * 10) / (1024ULL * 1024 * 1024);
+        snprintf(buf, bufsize, "%lu.%lu GB", (unsigned long)gb, (unsigned long)frac);
+    } else if (bytes >= 1024 * 1024) {
+        snprintf(buf, bufsize, "%lu MB", (unsigned long)(bytes / (1024 * 1024)));
+    } else if (bytes >= 1024) {
+        snprintf(buf, bufsize, "%lu KB", (unsigned long)(bytes / 1024));
+    } else {
+        snprintf(buf, bufsize, "%lu B", (unsigned long)bytes);
+    }
+}
+
+// ============================================================================
+// Step transitions
+// ============================================================================
+
+static void clamp_comp_scroll() {
+    int vis[32];
+    int n = component_visible_rows(vis, 32);
+    Rect list = components_list_rect();
+    int max_scroll = n * COMP_ROW_H - list.h;
+    if (max_scroll < 0) max_scroll = 0;
+    // Round up to a row boundary so the top visible row stays aligned.
+    max_scroll = ((max_scroll + COMP_ROW_H - 1) / COMP_ROW_H) * COMP_ROW_H;
+    if (g_state.comp_scroll > max_scroll) g_state.comp_scroll = max_scroll;
+    if (g_state.comp_scroll < 0) g_state.comp_scroll = 0;
+}
+
+static void goto_components() {
+    g_state.step = STEP_COMPONENTS;
+    g_state.comp_scroll = 0;
+    if (!components_sizes_ready()) {
+        set_status("Measuring component sizes...");
+        flush_ui();
+        components_compute_sizes();
+        set_status("");
+    }
+}
+
+static void step_advance() {
+    auto& st = g_state;
+    switch (st.step) {
+    case STEP_SELECT_DISK:
+        if (st.selected_disk >= 0) st.step = STEP_PARTITION_SCHEME;
+        break;
+    case STEP_PARTITION_SCHEME:
+        goto_components();
+        break;
+    case STEP_COMPONENTS:
+        st.step = STEP_CONFIRM;
+        break;
+    case STEP_CONFIRM:
+        st.step = STEP_INSTALLING;
+        st.log_count = 0;
+        break;
+    case STEP_UPDATE_SELECT_PART:
+        if (st.selected_part >= 0) st.step = STEP_UPDATE_CONFIRM;
+        break;
+    case STEP_UPDATE_CONFIRM:
+        st.step = STEP_UPDATING;
+        st.log_count = 0;
+        break;
+    default:
+        break;
+    }
+}
+
+static void step_back() {
+    auto& st = g_state;
+    switch (st.step) {
+    case STEP_SELECT_DISK:        st.step = STEP_MODE_SELECT; break;
+    case STEP_PARTITION_SCHEME:   st.step = STEP_SELECT_DISK; break;
+    case STEP_COMPONENTS:         st.step = STEP_PARTITION_SCHEME; break;
+    case STEP_CONFIRM:            st.step = STEP_COMPONENTS; break;
+    case STEP_UPDATE_SELECT_PART: st.step = STEP_MODE_SELECT; break;
+    case STEP_UPDATE_CONFIRM:     st.step = STEP_UPDATE_SELECT_PART; break;
+    default: break;
     }
 }
 
@@ -85,166 +155,141 @@ void format_disk_size(char* buf, int bufsize, uint64_t sectors, uint16_t sectorS
 // Mouse handling
 // ============================================================================
 
+// Returns false to signal quit.
 static bool handle_click(int mx, int my) {
     auto& st = g_state;
-    int fh = g_font ? g_font->get_cache(FONT_SIZE)->ascent - g_font->get_cache(FONT_SIZE)->descent : 16;
-    int fh_sm = g_font ? g_font->get_cache(FONT_SM)->ascent - g_font->get_cache(FONT_SM)->descent : 12;
 
-    // Common bottom button area
+    Rect primary = primary_btn_rect();
-    int btn_w = 120, btn_h = 34;
+    Rect secondary = secondary_btn_rect();
-    int btn_y = g_win_h - STATUS_H - btn_h - 12;
+    Rect tertiary = tertiary_btn_rect();
 
-    if (st.step == STEP_MODE_SELECT) {
+    switch (st.step) {
-        // Two mode cards
+    case STEP_MODE_SELECT:
-        int y = CONTENT_TOP + 16 + fh + 4 + fh_sm + 16;
+        if (mode_card_rect(0).contains(mx, my)) {
-        int card_h = 52, card_x = 16, card_w = g_win_w - 32;
-
-        // Install card
-        if (mx >= card_x && mx < card_x + card_w && my >= y && my < y + card_h) {
             st.mode = MODE_INSTALL;
             installer_refresh_disks();
             st.step = STEP_SELECT_DISK;
-            return true;
+        } else if (mode_card_rect(1).contains(mx, my)) {
-        }
-        y += card_h + 8;
-
-        // Update card
-        if (mx >= card_x && mx < card_x + card_w && my >= y && my < y + card_h) {
             st.mode = MODE_UPDATE;
             installer_refresh_parts();
             st.step = STEP_UPDATE_SELECT_PART;
-            return true;
         }
-    } else if (st.step == STEP_SELECT_DISK) {
+        break;
-        // Disk list items
+
-        int y = CONTENT_TOP + 40 + fh + 12;
+    case STEP_SELECT_DISK:
         for (int i = 0; i < st.disk_count; i++) {
-            int item_h = 48;
+            if (list_row_rect(i, DISK_ROW_H).contains(mx, my)) {
-            if (mx >= 16 && mx < g_win_w - 16 && my >= y && my < y + item_h) {
                 st.selected_disk = i;
                 return true;
             }
-            y += item_h + 4;
         }
-
+        if (primary.contains(mx, my)) step_advance();
-        // "Next" button
+        else if (secondary.contains(mx, my)) step_back();
-        int next_x = g_win_w - btn_w - 16;
+        else if (tertiary.contains(mx, my)) {
-        if (st.selected_disk >= 0 &&
-            mx >= next_x && mx < next_x + btn_w &&
-            my >= btn_y && my < btn_y + btn_h) {
-            st.step = STEP_PARTITION_SCHEME;
-            return true;
-        }
-
-        // "Refresh" button
-        int ref_w = 80;
-        int ref_x = next_x - ref_w - 8;
-        if (mx >= ref_x && mx < ref_x + ref_w &&
-            my >= btn_y && my < btn_y + btn_h) {
             installer_refresh_disks();
-            return true;
+            set_status("Disk list refreshed");
         }
-    } else if (st.step == STEP_PARTITION_SCHEME) {
+        break;
-        // Scheme radio buttons
+
-        int y = CONTENT_TOP + 40 + fh + 12;
+    case STEP_PARTITION_SCHEME:
         for (int i = 0; i < SCHEME_COUNT; i++) {
-            int item_h = 52;
+            if (list_row_rect(i, SCHEME_ROW_H).contains(mx, my)) {
-            if (mx >= 16 && mx < g_win_w - 16 && my >= y && my < y + item_h) {
                 st.partition_scheme = i;
                 return true;
             }
-            y += item_h + 4;
         }
+        if (primary.contains(mx, my)) step_advance();
+        else if (secondary.contains(mx, my)) step_back();
+        break;
 
-        // "Next" button
+    case STEP_COMPONENTS: {
-        int next_x = g_win_w - btn_w - 16;
+        int vis[32];
-        if (mx >= next_x && mx < next_x + btn_w &&
+        int n = component_visible_rows(vis, 32);
-            my >= btn_y && my < btn_y + btn_h) {
+        Rect list = components_list_rect();
-            st.step = STEP_CONFIRM;
+        for (int k = 0; k < n; k++) {
+            Rect row = component_row_rect(k);
+            if (row.y + row.h <= list.y || row.y >= list.y + list.h) continue;
+            if (!row.contains(mx, my)) continue;
+
+            int idx = vis[k];
+            bool child = g_components[idx].parent >= 0;
+            int x = row.x + 4 + (child ? COMP_INDENT : 0);
+
+            if (component_has_children(idx) && mx < x + COMP_TOGGLE_W + 4) {
+                g_components[idx].expanded = !g_components[idx].expanded;
+                clamp_comp_scroll();
+            } else {
+                component_toggle(idx);
+            }
             return true;
         }
-
+        if (primary.contains(mx, my)) step_advance();
-        // "Back" button
+        else if (secondary.contains(mx, my)) step_back();
-        int back_x = next_x - btn_w - 8;
+        break;
-        if (mx >= back_x && mx < back_x + btn_w &&
-            my >= btn_y && my < btn_y + btn_h) {
-            st.step = STEP_SELECT_DISK;
-            return true;
-        }
-    } else if (st.step == STEP_CONFIRM) {
-        int center_x = g_win_w / 2;
-        int gap = 16;
-
-        // "Install" button
-        int conf_x = center_x - btn_w - gap / 2;
-        if (mx >= conf_x && mx < conf_x + btn_w &&
-            my >= btn_y && my < btn_y + btn_h) {
-            st.step = STEP_INSTALLING;
-            st.log_count = 0;
-            return true;
     }
 
-        // "Back" button
+    case STEP_CONFIRM:
-        int canc_x = center_x + gap / 2;
+    case STEP_UPDATE_CONFIRM:
-        if (mx >= canc_x && mx < canc_x + btn_w &&
+        if (primary.contains(mx, my)) step_advance();
-            my >= btn_y && my < btn_y + btn_h) {
+        else if (secondary.contains(mx, my)) step_back();
-            st.step = STEP_PARTITION_SCHEME;
+        break;
-            return true;
+
-        }
+    case STEP_UPDATE_SELECT_PART:
-    } else if (st.step == STEP_DONE || st.step == STEP_ERROR) {
-        int close_x = (g_win_w - 100) / 2;
-        if (mx >= close_x && mx < close_x + 100 &&
-            my >= btn_y && my < btn_y + btn_h) {
-            return false; // signal quit
-        }
-    } else if (st.step == STEP_UPDATE_SELECT_PART) {
-        // Partition list items
-        int y = CONTENT_TOP + 16 + fh + 4 + fh_sm + 12;
         for (int i = 0; i < st.part_count; i++) {
-            int item_h = 48;
+            if (list_row_rect(i, PART_ROW_H).contains(mx, my)) {
-            if (mx >= 16 && mx < g_win_w - 16 && my >= y && my < y + item_h) {
                 st.selected_part = i;
                 return true;
             }
-            y += item_h + 4;
+        }
+        if (primary.contains(mx, my)) step_advance();
+        else if (secondary.contains(mx, my)) step_back();
+        break;
+
+    case STEP_DONE:
+    case STEP_ERROR:
+        if (primary.contains(mx, my)) return false;
+        break;
+
+    default:
+        break;
     }
 
-        // "Next" button
-        int next_x = g_win_w - btn_w - 16;
-        if (st.selected_part >= 0 &&
-            mx >= next_x && mx < next_x + btn_w &&
-            my >= btn_y && my < btn_y + btn_h) {
-            st.step = STEP_UPDATE_CONFIRM;
     return true;
 }
 
-        // "Back" button
+// ============================================================================
-        int back_x = next_x - btn_w - 8;
+// Key handling — returns false to signal quit
-        if (mx >= back_x && mx < back_x + btn_w &&
+// ============================================================================
-            my >= btn_y && my < btn_y + btn_h) {
-            st.step = STEP_MODE_SELECT;
-            return true;
-        }
-    } else if (st.step == STEP_UPDATE_CONFIRM) {
-        int center_x = g_win_w / 2;
-        int gap = 16;
 
-        // "Update" button
+static bool handle_key(const montauk::abi::KeyEvent& key) {
-        int upd_x = center_x - btn_w - gap / 2;
+    auto& st = g_state;
-        if (mx >= upd_x && mx < upd_x + btn_w &&
+
-            my >= btn_y && my < btn_y + btn_h) {
+    if (key.scancode == 0x01) { // Escape
-            st.step = STEP_UPDATING;
+        if (st.step == STEP_INSTALLING || st.step == STEP_UPDATING)
-            st.log_count = 0;
+            return true;
+        return false;
+    }
+
+    if (key.ascii == '\n' || key.ascii == '\r') {
+        if (st.step == STEP_DONE || st.step == STEP_ERROR) return false;
+        step_advance();
         return true;
     }
 
-        // "Back" button
+    if (key.scancode == 0x48) { // Up
-        int back_x = center_x + gap / 2;
+        if (st.step == STEP_SELECT_DISK && st.selected_disk > 0)
-        if (mx >= back_x && mx < back_x + btn_w &&
+            st.selected_disk--;
-            my >= btn_y && my < btn_y + btn_h) {
+        else if (st.step == STEP_UPDATE_SELECT_PART && st.selected_part > 0)
-            st.step = STEP_UPDATE_SELECT_PART;
+            st.selected_part--;
-            return true;
+        else if (st.step == STEP_PARTITION_SCHEME && st.partition_scheme > 0)
-        }
+            st.partition_scheme--;
+    } else if (key.scancode == 0x50) { // Down
+        if (st.step == STEP_SELECT_DISK && st.selected_disk < st.disk_count - 1)
+            st.selected_disk++;
+        else if (st.step == STEP_UPDATE_SELECT_PART && st.selected_part < st.part_count - 1)
+            st.selected_part++;
+        else if (st.step == STEP_PARTITION_SCHEME && st.partition_scheme < SCHEME_COUNT - 1)
+            st.partition_scheme++;
     }
 
     return true;
@@ -260,31 +305,21 @@ extern "C" void _start() {
     g_state.selected_part = -1;
     g_state.partition_scheme = SCHEME_EFI_EXT2;
     g_state.step = STEP_MODE_SELECT;
+    g_state.mouse_x = -1;
+    g_state.mouse_y = -1;
 
-    // Load font
+    if (!fonts::init())
-    {
+        montauk::exit(1);
-        TrueTypeFont* f = (TrueTypeFont*)montauk::malloc(sizeof(TrueTypeFont));
-        if (f) {
-            montauk::memset(f, 0, sizeof(TrueTypeFont));
-            if (!f->init("0:/fonts/Roboto-Medium.ttf")) { montauk::mfree(f); f = nullptr; }
-        }
-        g_font = f;
-    }
 
-    apply_scale(montauk::win_getscale());
+    g_accent = mtk::load_system_accent();
 
+    components_init();
     installer_refresh_disks();
 
     if (!g_window.create("Install MontaukOS", INIT_W, INIT_H))
         montauk::exit(1);
 
-    g_pixels = g_window.pixels;
+    flush_ui();
-    g_win_id = g_window.id;
-    g_backbuf = (uint32_t*)montauk::malloc(g_win_w * g_win_h * 4);
-
-    render(g_backbuf);
-    montauk::memcpy(g_pixels, g_backbuf, g_win_w * g_win_h * 4);
-    g_window.present();
 
     bool install_triggered = false;
 
@@ -314,32 +349,40 @@ extern "C" void _start() {
 
         if (ev.type == 3) break;
 
-        if (ev.type == 4) {
+        if (ev.type == 4) redraw = true;
-            apply_scale(g_window.scale_factor);
-            redraw = true;
-        }
 
         if (ev.type == 2) {
             g_win_w = g_window.width;
             g_win_h = g_window.height;
-            g_pixels = g_window.pixels;
+            if (g_state.step == STEP_COMPONENTS) clamp_comp_scroll();
-            montauk::mfree(g_backbuf);
-            g_backbuf = (uint32_t*)montauk::malloc(g_win_w * g_win_h * 4);
             redraw = true;
         }
 
         if (ev.type == 0 && ev.key.pressed) {
-            if (ev.key.scancode == 0x01) break;
+            if (!handle_key(ev.key)) break;
             redraw = true;
         }
 
         if (ev.type == 1) {
+            bool moved = (ev.mouse.x != g_state.mouse_x ||
+                          ev.mouse.y != g_state.mouse_y);
+            g_state.mouse_x = ev.mouse.x;
+            g_state.mouse_y = ev.mouse.y;
+
+            if (ev.mouse.scroll != 0 && g_state.step == STEP_COMPONENTS) {
+                g_state.comp_scroll -= ev.mouse.scroll * COMP_ROW_H;
+                clamp_comp_scroll();
+                redraw = true;
+            }
+
             bool clicked = (ev.mouse.buttons & 1) && !(ev.mouse.prev_buttons & 1);
             if (clicked) {
                 if (!handle_click(ev.mouse.x, ev.mouse.y))
                     break;
                 redraw = true;
             }
+
+            redraw |= moved;
         }
 
         if (redraw) flush_ui();

programs/src/lua/Makefile

@@ -14,7 +14,7 @@ SRCDIR   := src
 OBJDIR   := obj
 LIBC_DIR := ../../lib/libc
 BINDIR   := ../../bin/os
-LIBDIR   := ../../bin/lib/lua
+LIBDIR   := ../../bin/sdk/lua
 
 CFLAGS := \
     -std=gnu11 \

programs/src/lua/src/luaconf.h

@@ -223,8 +223,8 @@
 
 #elif defined(__MONTAUKOS__)	/* }{ */
 
-#define LUA_LDIR	"0:/lib/lua/"
+#define LUA_LDIR	"0:/sdk/lua/"
-#define LUA_CDIR	"0:/lib/lua/"
+#define LUA_CDIR	"0:/sdk/lua/"
 
 #if !defined(LUA_PATH_DEFAULT)
 #define LUA_PATH_DEFAULT  \

programs/src/tcc/Makefile

@@ -89,7 +89,7 @@ TARGET := $(BINDIR)/tcc.elf
 # ---- CRT objects (staged from shared libc) ----
 
 SHARED_CRT_DIR := $(LIBDIR)/libc
-CRT_DIR := ../../bin/lib/tcc/lib
+CRT_DIR := ../../bin/sdk/tcc/lib
 CRT_OBJS := $(CRT_DIR)/crt1.o $(CRT_DIR)/crti.o $(CRT_DIR)/crtn.o
 
 # ---- Rules ----

programs/src/tcc/config.h

@@ -16,10 +16,10 @@
 #undef CONFIG_TCC_BCHECK
 
 /* Paths on MontaukOS ramdisk */
-#define CONFIG_TCCDIR "0:/lib/tcc"
+#define CONFIG_TCCDIR "0:/sdk/tcc"
-#define CONFIG_TCC_SYSINCLUDEPATHS "0:/lib/tcc/include"
+#define CONFIG_TCC_SYSINCLUDEPATHS "0:/sdk/tcc/include"
-#define CONFIG_TCC_LIBPATHS "0:/lib/tcc/lib"
+#define CONFIG_TCC_LIBPATHS "0:/sdk/tcc/lib"
-#define CONFIG_TCC_CRTPREFIX "0:/lib/tcc/lib"
+#define CONFIG_TCC_CRTPREFIX "0:/sdk/tcc/lib"
 #define CONFIG_TCC_ELFINTERP ""
 
 /* We are not native -- no -run support */