chore(fix post commit): fixes post commit hooks borking the developer…

… machine (#1250)

.husky/post-commit

@@ -1,16 +1,40 @@
 #!/bin/sh
 . "$(dirname "$0")/_/husky.sh"
 
+SHORT_SHA=$(git rev-parse HEAD)
+LINT_LOG="$TMPDIR"/ncu.lint."$SHORT_SHA".log
+
 # display a notification
-# if osascript is not supported, do nothing
 notify() {
+  # if osascript is not supported, do nothing
   if [ -f /usr/bin/osascript ]; then
-    /usr/bin/osascript -e "display notification \"$*\" with title \"Notification\""
+    # get '<SHORT_SHA> <FIRST_LINE_OF_COMMIT_MSG>'
+    COMMIT_INFO=$(git log --oneline -n 1 --format="%h %s")
+
+    # read back in the lint errors
+    # TODO: update for each tye of error
+    ERRORS=$(cat "$LINT_LOG" | sed 1,4d)
+
+    # Trigger apple- or OSA-script on supported platforms
+    /usr/bin/osascript -e "display notification \"$ERRORS\" with title \"ncu: $COMMIT_INFO: $*\""
   fi
+
+  # always clean up the lint output, and do not clag-up TMPDIR
+  rm "$LINT_LOG"
 }
 
 # ensure failed lint exit code passes through sed
 set -o pipefail
 
-# omit first 4 lines printed by npm run
-npm run lint:src 2>&1 | sed 1,4d || notify "Lint Error" &
+branch=$(git branch --show-current)
+# Do NOT run this when rebasing or we can't get the branch
+if [ -z "$branch" ]; then
+  exit 0
+fi
+
+# Lint asynchrously, not blocking the terminal and piping all output to a file.
+# IFF lint fails trigger a pop-up (on supported platforms) with at least the
+# first error shown.
+# We pipe output so that the terminal (tmux, vim, emacs etc.) isn't borked by
+# stray output.
+npm run lint:src &> "$LINT_LOG" || notify "Lint Error" &