theme-gen: derive tmux and ghostty colours for any theme

`theme --set <mode> <name>` needs a tmux conf and a ghostty colour file that
alacritty-format themes do not provide, so such a name fell back to the
generic dark/light tmux colours and left ghostty unchanged, exiting 0.
bin/theme-gen reads a theme in alacritty .toml format (by alacritty-theme
checkout name or path) or Ghostty's bundled `palette = N=#hex` format, and
writes config/tmux/colors/<name>.conf and config/ghostty/colors/<name>, plus
config/alacritty/colors/<name>.toml for a ghostty-format source.

Generated with it: sonokai, solarized_osaka_night, kanagawabones and
dracula_plus_high_contrast, with nvim stand-ins for the three that have no
nvim port installed.

Parsed keys go through eval, so only plain section.key names and hex values
are accepted: a theme file could otherwise run commands.

From dot request 20261017-110255-work-laptop-48c22c.

1 files changed, 21 insertions, 0 deletions

diff --git a/config/ghostty/colors/sonokai b/config/ghostty/colors/sonokai
new file mode 100644
index 0000000..9cb18c6
--- /dev/null
+++ b/config/ghostty/colors/sonokai
@@ -0,0 +1,21 @@
+# sonokai color scheme (generated by theme-gen from /Users/sz/src/alacritty/alacritty-theme/themes/sonokai.toml)
+
+background = #2c2e34
+foreground = #e2e2e3
+
+palette = 0=#181819
+palette = 1=#fc5d7c
+palette = 2=#9ed072
+palette = 3=#e7c664
+palette = 4=#76cce0
+palette = 5=#b39df3
+palette = 6=#f39660
+palette = 7=#e2e2e3
+palette = 8=#7f8490
+palette = 9=#fc5d7c
+palette = 10=#9ed072
+palette = 11=#e7c664
+palette = 12=#76cce0
+palette = 13=#b39df3
+palette = 14=#f39660
+palette = 15=#e2e2e3