More theme functions

- `fish_list_themes`
- `fish_theme`

conf.d/25_prompt_theme.fish

@@ -1,6 +1,15 @@
 # Prompt theme
 
-# Set the theme name. Default: "default"
+# To get a list of available themes:
+# - Check the theme directories in $__fish_config_dir/themes/
+# - Or use the funtion `fish_list_themes`
+# To print the active prompt theme name:
+# Use function `fish_theme`
+
+# Set the theme name.
+# Default: "default"
+# The theme name must match the theme directory name.
 set -g FISH_PROMPT_THEME default
 
+# Load theme
 fish_load_theme $FISH_PROMPT_THEME

functions/fish_list_themes.fish

@@ -0,0 +1,7 @@
+function fish_list_themes --description "List available prompt themes"
+    for theme in $__fish_config_dir/themes/*
+        if test -d $theme
+            basename $theme
+        end
+    end
+end

functions/fish_theme.fish

@@ -0,0 +1,3 @@
+function fish_theme --description "Print the active prompt theme"
+    echo $FISH_PROMPT_THEME
+end