Add swaylock-wrapperHEADmaster

This makes a pretty lockscreen for sway, using grim to take a
screenshot, and imagemagick to blur and desaturate.

1 files changed, 66 insertions, 0 deletions

diff --git a/swaylock-wrapper b/swaylock-wrapper
new file mode 100755
index 0000000..2c1fae1
--- /dev/null
+++ b/swaylock-wrapper
@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+# Performs a standard screen lock, with an extra bit of style. Before locking
+# the screen, takes a screenshot of the current display and blurs and
+# desaturates the image, using that for the lock screen background. A mighty
+# neat effect. 
+#
+# Requirements: sway-lock grim imagemagick
+#
+export IFS=$'\n\t'
+set -euo pipefail
+
+
+# Generates the command to execute for taking a screenshot and applying affects
+# for use as the lockscreen wallpaper. Note that this does not execute the
+# command. It only generates it.
+#
+# @out_file   Path to save the lockscreen wallpaper to
+gen_wallpaper_cmd() {
+  local out_file="${1:?}"
+  local cmd=""
+
+  if type -p grim 1>/dev/null 2>/dev/null; then
+    cmd="$(type -p grim) -c -l 0 -"
+  else
+    return 2
+  fi
+
+  # Generate the wallpaper gen command (with blurring and desaturation)
+  printf '%s | convert - -scale 50%% -blur 0x3 -modulate 110,50 %s\n' \
+    "${cmd}" "${out_file}"
+}
+
+
+# Locks the screen using i3lock command. Sets 
+#
+# @bg   Path to image to be used for the lockscreen wallpaper
+lock_screen() {
+  local bg="${1:?}"
+  # Lock, but remain in foreground so the unlock processes aren't executed yet
+  swaylock -i "${bg}"
+}
+
+
+# La fonction primaire
+main() {
+  blurry_wallpaper='/tmp/swaylockwall.png'
+  # Get the program path that will screenshot for the background image
+  lock_wallpaper_cmd="$(gen_wallpaper_cmd ${blurry_wallpaper})"
+
+  if [ "${lock_wallpaper_cmd}" = "" ]; then
+    echo "Screenshot command not found (grim). Exiting."
+    return 1
+  fi
+
+  # Screenshot and post-process
+  bash -c "${lock_wallpaper_cmd}"
+
+  # Execute the lock screen with the new fancy wallpaper
+  lock_screen ${blurry_wallpaper}
+
+  # Cleanup the original screenshot and blurred counterpart
+  rm "${blurry_wallpaper}"
+}
+
+# Enter the script here
+main ${@}