add change-theme script

allows changing themes for future application instances as well as
currently-running ones on the fly.  xterm and emacs have been tested
and are known to work so far.

1 files changed, 30 insertions, 0 deletions

diff --git a/.local/bin/change-theme b/.local/bin/change-theme
new file mode 100755
index 0000000..5d997cd
--- /dev/null
+++ b/.local/bin/change-theme
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+dark_color='black' # #222
+light_color='white'
+
+if [ "$1" = "dark" ]; then
+    fg="$light_color"
+    bg="$dark_color"
+elif [ "$1" = "light" ]; then
+    fg="$dark_color"
+    bg="$light_color"
+else
+    echo "Usage: $0 {dark|light}"
+    exit 1
+fi
+
+# most applications using xresources
+printf "*.foreground: $fg\n*.background: $bg" | xrdb -override
+# xterm, basically
+printf "*VT100*foreground: $fg\n*VT100*background: $bg" | xrdb -override
+
+# emacs
+emacsclient -ue "(set-face-attribute 'default nil :foreground \"$fg\" :background \"$bg\")"
+# terminals
+for term in /dev/pts/*; do
+    if [ -w "$term" ]; then
+        printf "\033]10;$fg\a" > "$term"
+        printf "\033]11;$bg\a" > "$term"
+    fi
+done