Add opacity change script

1 files changed, 34 insertions, 0 deletions

diff --git a/opacity-change.sh b/opacity-change.sh
new file mode 100755
index 0000000..b509936
--- /dev/null
+++ b/opacity-change.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -eu
+[[ -n ${DEBUG:-} ]] && set -x
+
+#### Example alacritty.yml usage
+#key_bindings:
+#  - { key: N,  mods: Control|Shift,  action: SpawnNewInstance }
+#  - { key: O,  mods: Control|Shift,  command: { program: "opacity-change.sh", args: ["-"] } }
+#  - { key: P,  mods: Control|Shift,  command: { program: "opacity-change.sh", args: ["+"] } }
+
+
+operation="${1:-}${2:-}"      # Arg #1 & #2 (in case the user misinterpreted a space in the usage), Default ''
+step="${operation:1}"         # Substring from char index 1
+step="${step:-1}"             # Default '1'
+operation="${operation:0:1}"  # Substring from char index 0 length of 1
+config_file="$HOME/.config/alacritty/alacritty.yml"
+config_field="opacity"
+tmp_file="/tmp/$(basename $config_file).$(date +%s)"
+current_value=$(sed 's/#.*//g; /\b'"$config_field"':/!d; s/.*: \?//' < "$config_file")
+
+case $operation in
+"-")
+    verb="Decreasing" ;;
+"+")
+    verb="Increasing" ;;
+*)
+    echo "Usage: ${BASH_SOURCE[0]} (-|+)[int]"; exit 255 ;;
+esac
+
+new_value="$(awk '{n=$1+$2/10; print (n<0 ? 0 : n>1 ? 1 : n)}' <<<"$current_value $operation$step")"
+echo "$verb $config_field from $current_value to $new_value" >&2
+cp "$config_file" "$tmp_file"
+sed "s/\b$config_field:.*/$config_field: $new_value/" "$tmp_file" > "$config_file"
+