tv: alacritty-font-size -> font-size-alacritty

1 files changed, 67 insertions, 0 deletions

diff --git a/tv/5pkgs/simple/font-size-alacritty.nix b/tv/5pkgs/simple/font-size-alacritty.nix
new file mode 100644
index 0000000..84bc3f6
--- /dev/null
+++ b/tv/5pkgs/simple/font-size-alacritty.nix
@@ -0,0 +1,67 @@
+{ pkgs }:
+
+pkgs.writeDashBin "font-size-alacritty" ''
+  # usage: font-size-alacritty (+N|-N|=N)
+  # Increase by, decrease by, or set font size to the value N.
+
+  set -efu
+
+  min_size=8
+
+  op=''${1%%[0-9]*}
+  op=''${op:-=}
+
+  value=''${1#[=+-]}
+
+  window_id=$(${pkgs.xdotool}/bin/xdotool getactivewindow)
+
+  current_size=$(
+    ${pkgs.xorg.xprop}/bin/xprop -notype -id $window_id FONT_SIZE |
+    ${pkgs.gnused}/bin/sed -rn 's/.* = ([0-9]+)$/\1/p'
+  )
+
+  # usage: set_font_size WINDOW_ID FONT_SIZE
+  set_font_size() {
+    ${pkgs.alacritty}/bin/alacritty msg config -w $1 font.size=$2
+    ${pkgs.xorg.xprop}/bin/xprop -id $1 -f FONT_SIZE 32c -set FONT_SIZE $2
+  }
+
+  # usage: reset_font_size WINDOW_ID
+  reset_font_size() {
+    ${pkgs.alacritty}/bin/alacritty msg config -w $1 font.size=$min_size
+    ${pkgs.xorg.xprop}/bin/xprop -id $1 -remove FONT_SIZE
+  }
+
+  # usage: make_next_size
+  make_next_size() {
+    case $op in
+      -) next_size=$(expr $current_size - $value) ;;
+      =) next_size=$value ;;
+      +)
+        next_size=$(expr $current_size + $value)
+        test $next_size -ge $min_size || next_size=$min_size
+        ;;
+    esac
+  }
+
+  if test -z "$current_size"; then
+    current_size=0
+    make_next_size
+    if test $next_size -ge $min_size; then
+      ${pkgs.alacritty}/bin/alacritty msg config -w $window_id \
+          font.normal.family='Input Mono' \
+          font.normal.style=Condensed \
+          font.bold.family='Input Mono' \
+          font.bold.style=Bold
+      set_font_size $window_id $next_size
+    fi
+  else
+    make_next_size
+    if test $next_size -ge $min_size; then
+      set_font_size $window_id $next_size
+    else
+      ${pkgs.alacritty}/bin/alacritty msg config -w $window_id -r
+      reset_font_size $window_id
+    fi
+  fi
+''