cron: Take screenshots of all displays daily at 3:00 PM.

If run `~/.local/bin/screenshot_all_displays.sh` directly in crontab,
it can only capture the desktop wallpaper, not the apps that are
running. This is because crontab does not have the permission to record
the screen.

Therefore, [Automator][1] was used to solve this problem. It
can run shell scripts, and after saving it as an application, it can
use `open` to call and run it. The first time it runs, it will ask you
for permission as an application. This way, it can take screenshots in
crontab.

[1]: https://en.wikipedia.org/wiki/Automator_(macOS)

bin/.local/bin/screenshot_all_displays.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+
+SAVE_DIR="$HOME/kang8/screenshots"
+
+if [ ! -d "$SAVE_DIR" ]; then
+    mkdir --parents "$SAVE_DIR"
+fi
+
+DISPLAY_COUNT=$(/usr/sbin/system_profiler SPDisplaysDataType -json | /usr/bin/jq '.SPDisplaysDataType[].spdisplays_ndrvs | length')
+
+for ((i=1; i<=DISPLAY_COUNT; i++)); do
+    if [ $i -eq 1 ]; then
+        DISPLAY_NAME="main"
+    else
+        DISPLAY_NAME="secondary_$((i-1))"
+    fi
+
+    FILENAME="$(date '+%Y%m%d')_${DISPLAY_NAME}_screen.png"
+
+    /usr/sbin/screencapture -D $i -xC "$SAVE_DIR/$FILENAME"
+
+    echo "Screenshot saved to $SAVE_DIR/$FILENAME"
+done

crontab

@@ -10,5 +10,8 @@
 # Run at 11:05pm every day
 5 11 * * * cd ~/Library/Rime && git pull
 
+# Run at 15:00pm every day
+0 15 * * * ~/.local/bin/screenshot_all_displays.sh && open ~/Applications/ScreenshotAllDisplays.app
+
 # Run at 11:31pm every Tuesday
 31 11 * * 2 cd ~/.config/nvim && git fetch && git rebase origin/master && ~/.local/share/bob/nvim-bin/nvim --headless "+Lazy! restore" +qa