Add themeselect plugin to change on filename

In response to github issue https://github.com/franko/lite-xl/issues/149

1 files changed, 48 insertions, 0 deletions

diff --git a/plugins/themeselect.lua b/plugins/themeselect.lua
new file mode 100644
index 0000000..2fab481
--- /dev/null
+++ b/plugins/themeselect.lua
@@ -0,0 +1,48 @@
+-- lite-xl 1.16
+local core = require "core"
+
+-- Load a specific theme when the filename of an active document does match
+-- a pattern.
+
+-- usage:
+-- require("plugins.themeselect").add_pattern("%.md$", "summer")
+
+local theme_select = { }
+
+local saved_colors_module = "core.style"
+
+local themes_patterns = {
+}
+
+local reload_module = core.reload_module
+local set_visited = core.set_visited
+
+function core.reload_module(name)
+  if name:match("^colors%.") then
+    saved_colors_module = name
+  end
+  reload_module(name)
+end
+
+function core.set_visited(filename)
+  set_visited(filename)
+  for _, select in ipairs(themes_patterns) do
+    if filename:match(select.pattern) then
+      reload_module("colors." .. select.theme)
+      return
+    end
+  end
+  if saved_colors_module then
+    reload_module(saved_colors_module)
+  end
+end
+
+function theme_select.add_pattern(pattern, theme)
+  table.insert(themes_patterns, {pattern = pattern, theme = theme})
+end
+
+function theme_select.clear_patterns()
+  themes_patterns = {}
+end
+
+return theme_select