From 267df4029ec93d8bdcef0b4a61c92e188c208c4b Mon Sep 17 00:00:00 2001
From: Gabriel Arazas <foo.dogsquared@gmail.com>
Date: Mon, 10 Oct 2022 11:40:19 +0800
Subject: [PATCH] profiles/dev: add diffoscope for git difftool

---
 modules/nixos/profiles/dev.nix | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/modules/nixos/profiles/dev.nix b/modules/nixos/profiles/dev.nix
index 1bc8e697..524f74e5 100644
--- a/modules/nixos/profiles/dev.nix
+++ b/modules/nixos/profiles/dev.nix
@@ -40,6 +40,18 @@ in {
         enable = true;
         lfs.enable = true;
         package = pkgs.gitFull;
+        config.difftool.prompt = false;
+
+        # Yeah, let's use this oversized diff tool, shall we?
+        # Also, this config is based from this tip.
+        # https://lists.reproducible-builds.org/pipermail/diffoscope/2016-April/000193.html
+        config.difftool."diffoscope".cmd = ''
+            "if [ $LOCAL = /dev/null ]; then diffoscope --new-file $REMOTE; else diffoscope $LOCAL $REMOTE; fi"
+        '';
+
+        config.difftool."diffoscope-html".cmd = ''
+          "if [ $LOCAL = /dev/null ]; then diffoscope --new-file $REMOTE --html - | cat; else diffoscope $LOCAL $REMOTE --html - | cat; fi"
+        '';
       };
 
       programs.gnupg = { agent.enable = true; };
@@ -55,6 +67,7 @@ in {
         cachix # Compile no more by using someone's binary cache!
         curl # Our favorite network client.
         cmake # The poster boy for the hated build system.
+        diffoscope # Oversized caffeine grinder.
         direnv # The power of local development environment.
         gcc # The usual toolchain.
         gdb # The usual debugger.