feat(user/git): add interactive fixup

users/common/programs/git.nix

@@ -1,4 +1,30 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
+let
+  gf = lib.getExe (
+    pkgs.writeShellApplication {
+      name = "git-fixup-fzf";
+      runtimeInputs = [
+        pkgs.fzf
+        pkgs.gnugrep
+      ];
+      text = ''
+        if ! commit=$(git log --graph --color=always --format="%C(auto)%h%d %s %C(reset)%C(bold)%cr" "$@" \
+          | fzf --ansi --multi --no-sort --reverse --print-query --expect=ctrl-d --toggle-sort=\`); then
+          echo aborted
+          exit 0
+        fi
+
+        sha=$(grep -o '^[^a-z0-9]*[a-z0-9]\{7\}[a-z0-9]*' <<< "$commit" | grep -o '[a-z0-9]\{7\}[a-z0-9]*')
+        if [[ -z "$sha" ]]; then
+          echo "Found no checksum for selected commit. Aborting."
+          exit 1
+        fi
+
+        git fixup "$sha" "$@"
+      '';
+    }
+  );
+in
 {
   programs.git = {
     enable = true;
@@ -11,6 +37,7 @@
       p = "push";
       rebase = "rebase --gpg-sign";
       fixup = ''!f() { TARGET=$(git rev-parse "$1"); git commit --fixup=$TARGET ''${@:2} && EDITOR=true git rebase -i --gpg-sign --autostash --autosquash $TARGET^; }; f'';
+      f = "!${gf}";
       crm = ''!git commit -v -S --edit --file "$(git rev-parse --git-dir)"/COMMIT_EDITMSG'';
     };
     extraConfig = {