1 files changed, 148 insertions, 0 deletions
diff --git a/home/dot_local/share/mode/executable_mode b/home/dot_local/share/mode/executable_mode
new file mode 100644
index 0000000..dc188e9
--- /dev/null
+++ b/home/dot_local/share/mode/executable_mode
@@ -0,0 +1,148 @@
+#!/usr/bin/env sh
+progname="$(basename "$0")"
+data="$(dirname "$(readlink -f "$0")")"
+export data # path to directory containing reload.d, switch.d, etc.
+
+run_switch=1
+run_reload=1
+no_cfg=0
+theme="" # absolute path to theme
+
+# print error message and exit with error
+stupid() {
+	echo "$@" >&2
+	echo "run \`$progname --help\` for options" >&2
+	exit 1
+}
+
+usage() {
+	cat << EOF
+$progname -- switch system themes
+
+usage:
+	$progname [-chr] action|theme
+
+options:
+	-s, --no-switch    disable running switch.d hooks
+	-c, --no-cfggen    disable generation of templated configuration files
+	-h, --help         display this help text
+	-r, --no-reload    disable reloading of applications after applying theme
+
+actions:
+	restore    switch to last set theme ($XDG_CACHE_HOME/mode/state/theme)
+	reload     do not update configuration files, only reload applications
+	help       same as --help option
+	list       list all themes
+
+examples:
+	mode dark                   switch to dark mode and reload applications
+	mode restore --no-reload    make sure all configuration files are up-to-date
+	mode reload                 only reload applications
+
+EOF
+}
+
+# run a module file
+run_mod() {
+	mod_name="$1"
+
+	# modules must be executable
+	! [ -x "$mod_name" ] && return
+
+	# parse interpreter from shebang
+	interpreter="$(basename "$(command -v $(head -n1 "$mod_name" | sed -n 's/^#!\(.*\)/\1/p'))")"
+	if [ "$interpreter" = "sh" ] ; then
+		# source module if interpreter is POSIX sh (makes plugin functions available)
+		( . "$mod_name" )
+	else
+		# else, just run them
+		"$mod_name"
+	fi
+}
+
+# generate config files from theme file using scripts in switch.d
+switch() {
+	[ -z "$theme" ] && stupid "error: no theme selected"
+	[ ! -e "$theme" ] && stupid "error: theme not found"
+	export theme
+
+	theme_name="$(basename "$theme")"
+	echo "setting theme to $theme_name..."
+
+	# clean up environment
+	unset accent accent_text
+	unset mode
+
+	# load theme colors + aux variables
+	. "$theme"
+
+	# load plugins (TODO: plugins aren't loaded when only reloading)
+	for plugin in "$data"/plug.d/* ; do . "$plugin" ; done
+
+	# generate new config files / snippets (in parallel)
+	for switch_function in "$data"/switch.d/* ; do
+		run_mod "$switch_function" &
+	done
+
+	# join all processes started above
+	wait $(jobs -p)
+}
+
+# reload programs using scripts in reload.d
+reload() {
+	echo "reloading programs..."
+
+	for reload_function in "$data"/reload.d/* ; do
+		run_mod "$reload_function" &
+	done
+
+	wait $(jobs -p)
+}
+
+# main program argument parser (later argument always take priority)
+for arg in "$@" ; do
+	case "$arg" in
+		# stop parsing arguments after --
+		--) break ;;
+		# help
+		-h|--help|help) usage && exit 0 ;;
+		# only run reload scripts
+		reload) run_reload=1 run_switch=0 ;;
+		# prevent reload.d scripts from running
+		-r|--no-reload) run_reload=0 ;;
+		# prevent switch.d scripts from running
+		-s|--no-switch) run_switch=0 ;;
+		# prevent switch.d scripts from running
+		-c|--no-cfggen) no_cfg=1 ;;
+		# restore previous theme stored as symlink (see switch.d/mode)
+		restore)
+			theme="$(readlink -f "$XDG_CACHE_HOME/mode/state/theme")"
+			[ ! -e "$theme" ] && stupid "error: could not locate previous theme"
+			;;
+		# list themes in themes folder
+		list)
+			find "$data/themes" -type f,l | while read -r theme ; do
+				printf '%s' "$(basename "$theme")"
+				link="$(readlink "$theme")" && printf ' (%s)' "$link"
+				printf '\n'
+			done
+			exit 0
+			;;
+		*)
+			# check if unknown argument is a theme name
+			if [ -e "$data/themes/$arg" ] ; then
+				theme="$(readlink -f "$data/themes/$arg")"
+				continue
+			fi
+			# else throw error
+			stupid "error: unknown argument or theme: $arg"
+			;;
+	esac
+done
+
+export no_cfg
+
+# main
+[ $run_switch -eq 1 ] && switch
+[ $run_reload -eq 1 ] && reload
+