feat: supported branching for commit checking

.hooks/pre-merge-commit

@@ -0,0 +1,37 @@
+#!/usr/bin/env nix-shell
+#! nix-shell -i bash ../shell.nix
+
+# Get the target branch (the branch being merged into)
+target_branch=""
+
+# Check if we're in the middle of a merge
+if [ -f .git/MERGE_HEAD ]; then
+    # We're in a merge, check if the current branch is main
+    current_branch=$(git branch --show-current)
+    if [ "$current_branch" = "main" ]; then
+        target_branch="main"
+    fi
+fi
+
+# If we're merging into main, run nix flake check
+if [ "$target_branch" = "main" ]; then
+    echo "Merging into main branch - running nix flake check..."
+    
+    echo "stashing all uncommitted changes"
+    git stash -q --keep-index
+
+    echo "checking flakes all compile"
+    nix flake check
+
+    if [ ! $? -eq 0 ]; then
+        echo "Error: nix flake check failed. Merge aborted."
+        echo "Please fix the issues and try merging again."
+        exit 1
+    fi
+    
+    echo "nix flake check passed. Merge can proceed."
+else
+    echo "Not merging into main branch, skipping nix flake check."
+fi
+
+exit 0