Initial commit

skills/git-jj/scripts/repo_check.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+
+# repo_check.sh - Determine whether to use jj or git for this repository
+# Outputs to stdout: "jj", "git", or "no-repo"
+# Always exits with 0 on success
+#
+# Detection priority:
+#   1. .jj folder exists → "jj" (even if git repo also present)
+#   2. Git repository detected → "git"
+#   3. Neither found → "no-repo"
+
+set -e
+
+# Check for jj repository - priority 1
+# Note: jj often operates atop git, so check .jj first
+# Use `jj root` to detect jj workspace from any subdirectory
+if jj root > /dev/null 2>&1; then
+    echo "jj"
+    exit 0
+fi
+
+# Check for git repository - priority 2
+if git rev-parse --git-dir > /dev/null 2>&1; then
+    echo "git"
+    exit 0
+fi
+
+# Neither found - user needs to initialize
+echo "no-repo"
+exit 0