every helix and zed theme on the machine, not a curated nine

228 in the ring: 3 pardes ships plus all 214 helix runtime themes and all 11
zed variants across its three families. No exclusions.

inherits is what this cost. 76 themes need it, so the reader is two passes now,
and the merge is WHOLE-KEY rather than field-wise because helix merges the
theme body at depth 1 — the three *_transparent themes clear their parent's
background with an empty table, and a field-wise merge would leave it painted.
I had that wrong until I read helix-view/src/theme.rs.

At 214 files the generator meets themes that are SPARSE rather than broken, and
the old fatal-on-anything-missing would have rejected them. Every fallback is
helix's own rule: no background at all means wear the terminal's, so bg and fg
go null (13 themes, correctly); the twelve RGB fields that cannot be null fall
back to ghostty's default palette entries 7 and 0, which is exactly what a
pardes terminal already paints an unstyled ANSI index as. fatal is kept for
what genuinely cannot be read.

Three real bugs surfaced only at scale: #ccc shorthand doubles the nibble
(helix's rule, 58 colours), a quoted inline-table key silently dropped a
selection colour, and four themes name a cursor background EQUAL to the page
because they are about to reverse that cell — taking it painted an invisible
move box. 0 degenerate themes out of 225 now: no fg==bg, no syntax colour on
its own background, no invisible box.

Collisions get an unconditional rule rather than a clever one: a zed variant is
always <name>_zed, because both projects ship gruvbox, ayu and one, and a
conditional tag would move a name when the other source changes. A comptime
assert holds it.

Cost: no-op build 0.257 -> 0.276s, a pardes.zig change 46.8 -> 47.5s, binary
+0.98%. The generator does 217 sources in 54ms.

NextColor stays and is no longer a way to REACH a theme — but the browse got
better, not worse: the generated half sorts by name, so its neighbours are that
theme's own family. theme.golden's fourth click moved from ayu_dark to acid,
which sorting 225 names does; themesel gained a tail capture proving row 228
renders.

1 files changed, 18 insertions, 1 deletions

diff --git a/src/pardes.zig b/src/pardes.zig
index ced4c2f9..fbf48f05 100644
--- a/src/pardes.zig
+++ b/src/pardes.zig
@@ -326,7 +326,7 @@ const curated = struct {
 /// only ever a signature to whoever walks it, never a value in its own way.
 fn fold(comptime C: type) []const Theme {
     comptime {
-        @setEvalBranchQuota(20000); // themes x fields, and each field a @field lookup
+        @setEvalBranchQuota(400000); // 228 themes x 15 fields, each field a @field lookup, and the array re-concatenated per theme
         var out: []const Theme = &.{};
         for (@typeInfo(C).@"struct".decls) |d| {
             var t: Theme = undefined;
@@ -341,8 +341,25 @@ fn fold(comptime C: type) []const Theme {
 /// helix and zed sources in vendor/themes (build.zig runs it and hands the
 /// result over as a module). Adding one is dropping a file in there — there is
 /// no list here to append to, which is the whole point of folding the files.
+/// 228 of them: everything helix and zed ship, because "which of these is worth
+/// having" is the user's call and not the build's. That length is why ThemeSel
+/// exists — NextColor is a browse, not a way to arrive anywhere in particular.
 pub const themes = fold(curated) ++ fold(@import("generated_themes"));
 
+// Two themes answering to one name is a bug: `Theme <name>` resolves by name
+// and would silently pick whichever came first, and ThemeSel would list the
+// loser as a row that does nothing. The generated half cannot collide with
+// ITSELF — one file per theme, all imported into one struct, so zig's own
+// redeclaration error already catches that — which leaves exactly the cross
+// pair to check here, three times 225 rather than 228 squared. This is the
+// check that makes helix's `acme.toml` vendored as `acme_helix.toml`.
+comptime {
+    @setEvalBranchQuota(20000);
+    const ours = fold(curated).len;
+    for (themes[0..ours]) |c| for (themes[ours..]) |g| if (std.mem.eql(u8, c.name, g.name))
+        @compileError("theme name \"" ++ c.name ++ "\" is both ours and generated; rename the vendored source");
+}
+
 // ---- the boundary types ----
 
 pub const Color = union(enum) { default, index: u8, rgb: [3]u8 };