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+#!/usr/bin/env python3
+# udt-palette: generate every themed config from one palette and one role map.
+# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+# Licensed under the GNU General Public License v2 only.
+"""Render the palette into each consumer's own syntax.
+
+Usage: udt-palette [--roles <file>] [--out <dir>]
+       udt-palette --selftest
+
+The point of this script is that a colour is written down once. palette/<scheme>
+.conf holds the colours under the scheme's own names, palette/roles.conf says
+what each is for, and everything else here is generated. Editing a generated
+file is pointless: the next install.sh overwrites it.
+"""
+
+import re
+import sys
+from pathlib import Path
+
+REPO = Path(__file__).resolve().parent.parent
+PALETTE_DIR = REPO / "palette"
+
+
+def parse_conf(path):
+    """Parse `key = value` lines into a dict, preserving order.
+
+    [section] headers are read but not nested: roles are a flat namespace, and
+    the sections exist to group the file for a human reader. A duplicate key is
+    an error rather than a silent last-wins, because two roles quietly fighting
+    is exactly the drift this file exists to prevent.
+    """
+    out = {}
+    for lineno, raw in enumerate(path.read_text().splitlines(), 1):
+        # A comment is a whole line starting with #, or a trailing "# " after
+        # a value. Splitting on a bare "#" would eat every colour, since the
+        # values are hex literals that start with one.
+        line = raw.strip()
+        if line.startswith("#"):
+            continue
+        line = re.split(r"\s#\s", line, maxsplit=1)[0].strip()
+        if not line or line.startswith("["):
+            continue
+        if "=" not in line:
+            raise ValueError(f"{path}:{lineno}: expected 'key = value', got {raw!r}")
+        key, value = (p.strip() for p in line.split("=", 1))
+        if key in out:
+            raise ValueError(f"{path}:{lineno}: duplicate key {key!r}")
+        out[key] = value
+    return out
+
+
+def resolve(roles, palette, roles_path):
+    """Turn every role into (r, g, b, alpha). Unknown colour names are fatal.
+
+    A role names a palette colour, optionally with an alpha percentage:
+    `text/75`. Failing here is the whole safety story: a typo or a name the new
+    scheme does not carry stops the build, rather than emitting a config with a
+    black hole where a colour should be.
+    """
+    resolved = {}
+    for role, spec in roles.items():
+        if role in ("scheme", "snap"):
+            continue
+        # `name/75` is 75% alpha; `name*50` is the colour at 50% brightness.
+        # shade exists because GTK's shade() has no palette name to point at:
+        # half-brightness crust is darker than the darkest colour a scheme
+        # ships, so it can only be computed.
+        rest, _, alpha_s = spec.partition("/")
+        name, _, shade_s = rest.partition("*")
+        name = name.strip()
+        if name not in palette:
+            available = ", ".join(sorted(palette))
+            raise ValueError(
+                f"{roles_path}: role {role!r} wants colour {name!r}, which the "
+                f"{roles['scheme']} palette does not define.\nAvailable: {available}")
+        alpha = 100
+        if alpha_s:
+            alpha = int(alpha_s.strip())
+            if not 0 <= alpha <= 100:
+                raise ValueError(f"{roles_path}: role {role!r} alpha {alpha} out of 0-100")
+        hexval = palette[name]
+        r, g, b = (int(hexval[i:i + 2], 16) for i in (1, 3, 5))
+        if shade_s:
+            factor = int(shade_s.strip()) / 100
+            if not 0 <= factor <= 2:
+                raise ValueError(f"{roles_path}: role {role!r} shade out of 0-200")
+            r, g, b = (min(255, round(c * factor)) for c in (r, g, b))
+        resolved[role] = (r, g, b, alpha)
+    return resolved
+
+
+def hex6(c):
+    r, g, b, _ = c
+    return f"#{r:02x}{g:02x}{b:02x}"
+
+
+def hex8(c):
+    r, g, b, a = c
+    return f"#{r:02x}{g:02x}{b:02x}{round(a * 255 / 100):02x}"
+
+
+def rgba(c):
+    r, g, b, a = c
+    return f"rgb({r},{g},{b})" if a == 100 else f"rgba({r},{g},{b},{a / 100:.2f})"
+
+
+BANNER = "Generated by udt-palette from palette/{scheme}.conf. Do not edit."
+
+
+def gen_rofi(res, scheme, palette):
+    """rofi: the structural palette, under the scheme's own colour names.
+
+    Emits palette names rather than roles because the rofi themes were written
+    against Catppuccin names and still use them. The role layer reaches rofi
+    through accent.rasi, which udt-accent generates per wallpaper.
+    """
+    rows = "\n".join(f"    {k + ':':11}{v}ff;" for k, v in sorted(palette.items()))
+    return (
+        f"/*\n * {BANNER.format(scheme=scheme)}\n *\n"
+        " * Structural colors only. The accent lives in accent.rasi.\n */\n\n"
+        f"* {{\n{rows}\n}}\n"
+    )
+
+
+def gen_waybar(res, scheme, palette):
+    """waybar: one file holding the palette and the role layer.
+
+    Both halves together because style.css imports a single themes/<scheme>.css,
+    and the stylesheets reference names from each: @lavender and @surface1 from
+    the palette, @cpu and @hover-bg from the roles.
+
+    Role names keep their existing hyphenated spelling (main-bg, not main_bg):
+    the stylesheets reference them and are not generated.
+    """
+    palette_rows = "\n".join(f"@define-color {k:<12}{v};"
+                              for k, v in sorted(palette.items()))
+
+    def emit(role, css_name=None):
+        c = res[role]
+        return f"@define-color {(css_name or role.replace('_', '-')):<12}{rgba(c)};"
+
+    ui = ["main_br", "main_bg", "main_fg", "hover_bg", "hover_fg", "outline"]
+    modules = ["workspaces", "temperature", "memory", "cpu", "time", "date",
+               "tray", "volume", "backlight", "battery"]
+    states = ["warning", "critical", "charging"]
+
+    return "\n".join([
+        f"/* {BANNER.format(scheme=scheme)} */",
+        "",
+        palette_rows,
+        "",
+        "/* br - border, bg - background, fg - foreground */",
+        "",
+        "/* main colors */",
+        f"@define-color accent      {rgba(res['accent'])};",
+        *(emit(r) for r in ui),
+        "",
+        "/* module colors */",
+        *(emit(r) for r in modules),
+        "",
+        "/* state colors */",
+        *(emit(r) for r in states),
+        "",
+    ])
+
+
+def gen_kitty(res, scheme, palette):
+    """kitty: the 16 ANSI slots plus chrome.
+
+    kitty has no include-with-override, so this is the whole colour section of
+    the theme file rather than a fragment.
+    """
+    ansi = ["black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"]
+    lines = [f"# {BANNER.format(scheme=scheme)}", ""]
+    for key, role in [("foreground", "fg"), ("background", "bg"),
+                      ("selection_foreground", "selection_fg"),
+                      ("selection_background", "selection_bg"),
+                      ("cursor", "cursor"), ("cursor_text_color", "bg"),
+                      ("url_color", "url"),
+                      ("active_border_color", "border_active"),
+                      ("inactive_border_color", "border_inactive"),
+                      ("active_tab_foreground", "tab_active_fg"),
+                      ("active_tab_background", "tab_active_bg"),
+                      ("inactive_tab_foreground", "tab_inactive_fg"),
+                      ("inactive_tab_background", "tab_inactive_bg"),
+                      ("tab_bar_background", "tab_bar_bg"),
+                      ("scrollbar_handle_color", "scrollbar_handle"),
+                      ("scrollbar_track_color", "scrollbar_track"),
+                      ("bell_border_color", "bell_border"),
+                      ("mark1_foreground", "bg"), ("mark1_background", "mark1"),
+                      ("mark2_foreground", "bg"), ("mark2_background", "mark2"),
+                      ("mark3_foreground", "bg"), ("mark3_background", "mark3")]:
+        lines.append(f"{key:<24}{hex6(res[role])}")
+    lines.append("")
+    for i, name in enumerate(ansi):
+        lines.append(f"color{i:<3}{' ' * 16}{hex6(res[name])}")
+    for i, name in enumerate(ansi):
+        lines.append(f"color{i + 8:<3}{' ' * 16}{hex6(res['bright_' + name])}")
+    return "\n".join(lines) + "\n"
+
+
+def gen_dunst(res, scheme, palette, template):
+    """dunst: substitute colours into the shipped template.
+
+    Kept as a template rather than fully generated: dunstrc is mostly geometry
+    and behaviour that has nothing to do with colour. @ACCENT@ is left alone,
+    because udt-accent substitutes it per wallpaper after pywal renders it.
+    """
+    out = template.replace("@SCHEME@", scheme)
+    for role in ("bg", "bg_alt", "fg", "fg_dim", "border", "critical"):
+        out = out.replace(f"@{role.upper()}@", hex6(res[role]))
+    return out
+
+
+def gen_conky(res, scheme, palette, template):
+    """conky: substitute into the shipped template.
+
+    conky.text is laid out with absolute ${goto} offsets tuned to label widths,
+    so it is never regenerated, only its colour block is substituted.
+    """
+    out = template.replace("@SCHEME@", scheme)
+    for role in ("heading", "label", "rule", "value", "highlight", "ok",
+                 "body", "body_outline", "body_shade"):
+        out = out.replace(f"@{role.upper()}@", hex6(res[role]))
+    return out
+
+
+def gen_accent_py(res, scheme, palette, snap_names):
+    """The accent table and Macchiato dict udt-accent carries for Firefox.
+
+    Written as a Python fragment that udt-accent imports, so the accent snapping
+    and the pywalfox palette both follow the scheme instead of hardcoding one.
+    """
+    # The snap candidates are declared per scheme, not derived: which hues make
+    # good accents is a judgement about the palette (drop near-neutrals, drop
+    # near-duplicate hues) that the colour values alone do not carry.
+    candidates = {n: palette[n] for n in snap_names}
+    rows = "\n".join(f'    {n!r}: {v!r},' for n, v in candidates.items())
+
+    ansi = ["black", "red", "green", "yellow", "blue", "magenta", "cyan", "white"]
+    normal = ", ".join(f'"{hex6(res[n])}"' for n in ansi)
+    bright = ", ".join(f'"{hex6(res["bright_" + n])}"' for n in ansi)
+
+    return (
+        f"# {BANNER.format(scheme=scheme)}\n"
+        '"""Generated colour tables. See palette/roles.conf."""\n\n'
+        f"SCHEME = {scheme!r}\n\n"
+        "# The candidate accents udt-accent snaps a wallpaper to.\n"
+        f"ACCENTS = {{\n{rows}\n}}\n\n"
+        f"FALLBACK = {accent_name(res, palette, candidates)!r}\n\n"
+        "# Firefox, via pywalfox, which reads colors.json and nothing else.\n"
+        "PALETTE = {\n"
+        f'    "background": "{hex6(res["bg"])}",\n'
+        f'    "foreground": "{hex6(res["fg"])}",\n'
+        f'    "cursor": "{hex6(res["cursor"])}",\n'
+        f"    \"colors\": [{normal},\n"
+        f"               {bright}],\n"
+        "}\n"
+    )
+
+
+def accent_name(res, palette, candidates):
+    """Which candidate udt-accent falls back to when a wallpaper is too grey.
+
+    The accent role's own colour, so the fallback matches what every consumer
+    that does not track the wallpaper is already sitting on.
+    """
+    target = hex6(res["accent"])
+    for name, hexval in candidates.items():
+        if hexval == target:
+            return name
+    return next(iter(candidates))
+
+
+def schemes():
+    """Every scheme that ships both a palette and a role map."""
+    return sorted(p.stem for p in PALETTE_DIR.glob("*.conf")
+                  if p.stem != "roles" and not p.stem.startswith("roles-"))
+
+
+def load(selector_path, scheme=None):
+    """Read the selected scheme's palette and role map.
+
+    The selector names a scheme; the scheme names two files. Keeping the role
+    map per-scheme is what lets a palette use its own colour names: Nord has no
+    `base` and Dracula no `surface0`, so one shared map could not satisfy both.
+    """
+    if scheme is None:
+        scheme = parse_conf(selector_path).get("scheme")
+    if not scheme:
+        raise ValueError(f"{selector_path}: no 'scheme' line")
+
+    palette_path = PALETTE_DIR / f"{scheme}.conf"
+    roles_path = PALETTE_DIR / f"roles-{scheme}.conf"
+    for needed in (palette_path, roles_path):
+        if not needed.exists():
+            raise ValueError(
+                f"scheme {scheme!r} is missing {needed.name}. "
+                f"Available: {', '.join(schemes())}")
+
+    roles = parse_conf(roles_path)
+    palette = parse_conf(palette_path)
+    for name, value in palette.items():
+        if not re.fullmatch(r"#[0-9a-fA-F]{6}", value):
+            raise ValueError(f"{palette_path}: {name} = {value!r} is not #rrggbb")
+    snap_names = roles.get("snap", "").split()
+    if not snap_names:
+        raise ValueError(f"{roles_path}: no [accents] snap list")
+    for name in snap_names:
+        if name not in palette:
+            raise ValueError(
+                f"{roles_path}: snap candidate {name!r} is not in the {scheme} palette")
+
+    roles["scheme"] = scheme
+    return scheme, palette, resolve(roles, palette, roles_path), snap_names
+
+
+# What gets written where. Templates are read from the repo, everything else is
+# generated whole.
+TARGETS = [
+    ("rofi/udt/palette.rasi", gen_rofi, None),
+    ("templates/waybar/theme.css", gen_waybar, None),
+    ("templates/terminal/kitty-theme.conf", gen_kitty, None),
+    ("templates/dunstrc", gen_dunst, "templates/dunstrc.in"),
+    ("templates/conky.conf", gen_conky, "templates/conky.conf.in"),
+    ("bin/udt_colors.py", gen_accent_py, None),
+]
+
+
+def generate(roles_path, out_dir):
+    scheme, palette, res, snap_names = load(roles_path)
+    written = []
+    for target, fn, template in TARGETS:
+        dest = out_dir / target
+        if template:
+            src = REPO / template
+            if not src.exists():
+                raise ValueError(f"missing template {src}")
+            content = fn(res, scheme, palette, src.read_text())
+        elif fn is gen_accent_py:
+            content = fn(res, scheme, palette, snap_names)
+        else:
+            content = fn(res, scheme, palette)
+        dest.parent.mkdir(parents=True, exist_ok=True)
+        dest.write_text(content)
+        written.append(target)
+    return scheme, written
+
+
+def selftest():
+    # Every shipped scheme must satisfy every role, or switching to it breaks
+    # at install time. load() raises on any role the palette cannot supply.
+    names = schemes()
+    assert names, "no palettes found"
+
+    seen = {}
+    for scheme in names:
+        _, _, res, snap = load(None, scheme=scheme)
+        assert res["bg"] != res["fg"], f"{scheme}: bg and fg are the same colour"
+        assert len(snap) >= 5, f"{scheme}: only {len(snap)} snap candidates"
+        seen[scheme] = set(res)
+        print(f"  {scheme}: {len(res)} roles, {len(snap)} accents")
+
+    # Every scheme must define the SAME roles: a generator asks for a role by
+    # name, so one scheme missing it would fail only once that scheme was
+    # selected, which is exactly the late failure this check exists to prevent.
+    reference = seen[names[0]]
+    for scheme, roles in seen.items():
+        missing = reference - roles
+        extra = roles - reference
+        assert not missing, f"{scheme} is missing roles: {sorted(missing)}"
+        assert not extra, f"{scheme} has roles no other scheme has: {sorted(extra)}"
+
+    # Alpha survives the round trip into each syntax.
+    assert hex8((202, 211, 245, 75)) == "#cad3f5bf", hex8((202, 211, 245, 75))
+    assert hex8((202, 211, 245, 100)) == "#cad3f5ff"
+    assert rgba((202, 211, 245, 100)) == "rgb(202,211,245)"
+    assert rgba((202, 211, 245, 75)) == "rgba(202,211,245,0.75)"
+
+    # A role naming a colour the palette lacks must fail, not emit a hole.
+    try:
+        resolve({"scheme": "x", "bad": "nosuchcolour"}, {"base": "#000000"}, "probe")
+    except ValueError as exc:
+        assert "nosuchcolour" in str(exc)
+    else:
+        raise AssertionError("unknown colour did not raise")
+
+    print("selftest OK")
+
+
+def main(argv):
+    if "--selftest" in argv:
+        selftest()
+        return 0
+
+    roles_path = PALETTE_DIR / "roles.conf"
+    out_dir = REPO
+    if "--roles" in argv:
+        roles_path = Path(argv[argv.index("--roles") + 1]).expanduser()
+    if "--out" in argv:
+        out_dir = Path(argv[argv.index("--out") + 1]).expanduser()
+
+    try:
+        scheme, written = generate(roles_path, out_dir)
+    except ValueError as exc:
+        print(f"udt-palette: {exc}", file=sys.stderr)
+        return 1
+
+    print(f"{scheme}: {len(written)} files")
+    for w in written:
+        print(f"  {w}")
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))