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.

3 files changed, 78 insertions, 0 deletions

diff --git a/config/alacritty/colors/dracula_plus_high_contrast.toml b/config/alacritty/colors/dracula_plus_high_contrast.toml
new file mode 100644
index 0000000..6eaa8ec
--- /dev/null
+++ b/config/alacritty/colors/dracula_plus_high_contrast.toml
@@ -0,0 +1,24 @@
+# dracula_plus_high_contrast (generated by theme-gen from /Applications/Ghostty.app/Contents/Resources/ghostty/themes/Dracula+ High Contrast)
+[colors.primary]
+background = "#14141a"
+foreground = "#f8f8f2"
+
+[colors.normal]
+black = "#9ba0b4"
+red = "#ff7676"
+green = "#50fa7b"
+yellow = "#ffcb6b"
+blue = "#82aaff"
+magenta = "#c792ea"
+cyan = "#8be9fd"
+white = "#f8f8f2"
+
+[colors.bright]
+black = "#9ba1b5"
+red = "#ff8a8a"
+green = "#69ff94"
+yellow = "#ffd98a"
+blue = "#d6acff"
+magenta = "#ff92df"
+cyan = "#a4ffff"
+white = "#ffffff"
diff --git a/config/alacritty/colors/kanagawabones.toml b/config/alacritty/colors/kanagawabones.toml
new file mode 100644
index 0000000..93e6eaa
--- /dev/null
+++ b/config/alacritty/colors/kanagawabones.toml
@@ -0,0 +1,24 @@
+# kanagawabones (generated by theme-gen from /Applications/Ghostty.app/Contents/Resources/ghostty/themes/Kanagawabones)
+[colors.primary]
+background = "#1f1f28"
+foreground = "#ddd8bb"
+
+[colors.normal]
+black = "#1f1f28"
+red = "#e46a78"
+green = "#98bc6d"
+yellow = "#e5c283"
+blue = "#7eb3c9"
+magenta = "#957fb8"
+cyan = "#7eb3c9"
+white = "#ddd8bb"
+
+[colors.bright]
+black = "#49495e"
+red = "#ec818c"
+green = "#9ec967"
+yellow = "#f1c982"
+blue = "#7bc2df"
+magenta = "#a98fd2"
+cyan = "#7bc2df"
+white = "#a8a48d"
diff --git a/config/alacritty/colors/solarized_osaka_night.toml b/config/alacritty/colors/solarized_osaka_night.toml
new file mode 100644
index 0000000..11a1fbc
--- /dev/null
+++ b/config/alacritty/colors/solarized_osaka_night.toml
@@ -0,0 +1,30 @@
+# Solarized Osaka Night (dark variant) -- copied from ~/src/alacritty/alacritty-theme/themes/solarized_osaka.toml
+# Colors (Solarized Osaka)
+# Source https://github.com/craftzdog/solarized-osaka.nvim
+
+# Default colors
+[colors.primary]
+background = '#001a1d'
+foreground = '#839496'
+
+# Normal colors
+[colors.normal]
+black   = '#073642'
+red     = '#dc322f'
+green   = '#859900'
+yellow  = '#b58900'
+blue    = '#268bd2'
+magenta = '#d33682'
+cyan    = '#2aa198'
+white   = '#eee8d5'
+
+# Bright colors
+[colors.bright]
+black   = '#4c4c4c'
+red     = '#cb4b16'
+green   = '#586e75'
+yellow  = '#657b83'
+blue    = '#839496'
+magenta = '#6c71c4'
+cyan    = '#93a1a1'
+white   = '#fdf6e3'