modularize

packages/font-size.nix

@@ -0,0 +1,26 @@
+{ writeDashBin, font }:
+writeDashBin "font-size" ''
+  set -efu
+
+  # set_font NORMAL_FONT BOLD_FONT
+  set_font() {
+    printf '\033]710;%s\007' "$1"
+    printf '\033]711;%s\007' "$2"
+  }
+
+  case ''${1-} in
+    '''|0|--reset)
+      set_font \
+          "xft:${font.name}:size=${toString font.size}" \
+          "xft:${font.name}:size=${toString font.size}:bold" \
+      ;;
+    [2-9]|[1-9][0-9]|[1-9][0-9][0-9])
+      set_font \
+          "xft:${font.name}:size=$1" \
+          "xft:${font.name}:size=$1:bold" \
+      ;;
+    *)
+      echo "$0: bad argument: $1" >&2
+      exit 1
+  esac
+''