From ce7bb9be0e244fcf0f03aef8d322a9cb31b1f8d4 Mon Sep 17 00:00:00 2001
From: Ryan Horiguchi <ryan.horiguchi@gmail.com>
Date: Thu, 9 Nov 2023 17:57:42 +0100
Subject: [PATCH] Add commit-msg hook to git templates

---
 .../home-manager/{git.nix => git/default.nix} |  2 ++
 modules/home-manager/git/template.nix         | 23 +++++++++++++++++++
 2 files changed, 25 insertions(+)
 rename modules/home-manager/{git.nix => git/default.nix} (98%)
 create mode 100644 modules/home-manager/git/template.nix

diff --git a/modules/home-manager/git.nix b/modules/home-manager/git/default.nix
similarity index 98%
rename from modules/home-manager/git.nix
rename to modules/home-manager/git/default.nix
index 88981c0cc..6fedcdfd4 100755
--- a/modules/home-manager/git.nix
+++ b/modules/home-manager/git/default.nix
@@ -1,4 +1,6 @@
 { pkgs, config, lib, colors, ... }: {
+  imports = [ ./template.nix ];
+
   home = {
     packages = [ pkgs.nano ];
 
diff --git a/modules/home-manager/git/template.nix b/modules/home-manager/git/template.nix
new file mode 100644
index 000000000..bb79f4003
--- /dev/null
+++ b/modules/home-manager/git/template.nix
@@ -0,0 +1,23 @@
+{ pkgs, lib, config, ... }: {
+  programs.git.extraConfig.init.templatedir = "${config.home.homeDirectory}/.git_template";
+
+  home.file.".git_template/hooks/commit-msg".source = pkgs.writeShellScript "commit-msg" ''
+    PATH=${lib.makeBinPath [ pkgs.coreutils ]}
+
+    readonly COMMIT_MSG_FILE="$1"
+
+    function check_commit_msg_length {
+        readonly MAX_MSG_LENGTH=72
+
+        local title=$(head -n 1 "$COMMIT_MSG_FILE")
+
+        if [ ''${#title} -gt $MAX_MSG_LENGTH ]; then
+            # TODO figure out how to use hex colors variable
+            echo -e "\x1b[1;38;5;203mCommit title is ''${#title} characters long, must be equal or shorter than $MAX_MSG_LENGTH characters!\e[0m";
+            exit 1
+        fi
+    }
+
+    check_commit_msg_length
+  '';
+}