Theme takes a name in any case, and a miss names its nearest themes

Names were case-sensitive, and a miss listed only the first letter's themes that fitted 40 bytes, 4 of the many d ones. It now lists every theme sharing the first letter when they fit the 128 bytes an Rerror carries, else the nearest by a plain likeness score (shared prefix, the name inside, its letters in order).

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 3 insertions, 6 deletions

diff --git a/src/exec.zig b/src/exec.zig
index 683b2f04..9ec6a426 100644
--- a/src/exec.zig
+++ b/src/exec.zig
@@ -906,15 +906,12 @@ pub fn applySettingBuiltin(p: *Pardes, setting: config.Runtime.Setting, arg: ?[]
     switch (setting.action) {
         .theme => {
             const want = std.mem.trim(u8, arg orelse return, " \t\r\n");
-            for (themes, 0..) |t, i| if (std.mem.eql(u8, t.name, want)) {
-                colors.setThemeIndex(p, i);
-                return;
-            };
+            if (colors.themeIndex(want)) |i| return colors.setThemeIndex(p, i);
             // A config line is not answered on screen (applyStartupConfig
             // runs with announce off); a click or a ctl write is.
             if (!p.announce) return;
-            var near: [96]u8 = undefined;
-            var text: [200]u8 = undefined;
+            var near: [170]u8 = undefined;
+            var text: [256]u8 = undefined;
             return p.reportFailure(p.active, std.fmt.bufPrint(&text, "Theme: no theme \"{s}\"; like it: {s}; Themes lists all", .{ want[0..@min(want.len, 40)], colors.themesNear(&near, want) }) catch "Theme: no such theme");
         },
         .font => {