Add wallpaper switch

hm-modules/theme/log.sh

@@ -0,0 +1,24 @@
+# shellcheck shell=bash
+# Colorful, TTY-aware logging helpers: log_info / log_warn / log_error.
+#
+# Everything is written to *stderr*, so a script's stdout stays a clean data
+# channel (e.g. wallpaper-pick prints the chosen image path on stdout while
+# its progress goes to stderr). Set SCRIPT_TAG to prefix every line with the
+# originating script, e.g. "[theme-switch] selecting wallpaper...".
+#
+# Colors are auto-disabled when stderr isn't a terminal or NO_COLOR is set.
+__theme_log_init() {
+  if [ -t 2 ] && [ -z "${NO_COLOR:-}" ]; then
+    __C_RESET=$'\033[0m'
+    __C_INFO=$'\033[1;34m'   # blue
+    __C_WARN=$'\033[1;33m'   # yellow
+    __C_ERR=$'\033[1;31m'    # red
+  else
+    __C_RESET=""; __C_INFO=""; __C_WARN=""; __C_ERR=""
+  fi
+}
+__theme_log_init
+
+log_info()  { printf '%s%s%s%s\n' "${__C_INFO}" "${SCRIPT_TAG:+[$SCRIPT_TAG] }" "$*" "${__C_RESET}" >&2; }
+log_warn()  { printf '%s%s%s%s\n' "${__C_WARN}" "${SCRIPT_TAG:+[$SCRIPT_TAG] }" "warning: $*" "${__C_RESET}" >&2; }
+log_error() { printf '%s%s%s%s\n' "${__C_ERR}"  "${SCRIPT_TAG:+[$SCRIPT_TAG] }" "error: $*"   "${__C_RESET}" >&2; }