home/git: add all-commits script

home/programs/git/default.nix

@@ -357,6 +357,11 @@ lib.mkIf cfg.enable {
       runtimeInputs = with pkgs; [ cfg.package gnused gnugrep gawk uutils-coreutils-noprefix ];
       text = lib.fileContents ./scripts/git-author-lines.sh;
     })
+    (pkgs.writeShellApplication {
+      name = "git-all-commits";
+      runtimeInputs = with pkgs; [ cfg.package gnugrep gawk findutils uutils-coreutils-noprefix ];
+      text = lib.fileContents ./scripts/git-all-commits.sh;
+    })
     ((pkgs.writers.writePython3Bin "git-post-pr" {
       libraries = with pkgs.python3Packages; [
         tkinter

home/programs/git/scripts/git-all-commits.sh

@@ -0,0 +1,15 @@
+GIT_ROOT="$(git rev-parse --show-toplevel)"
+
+find "$GIT_ROOT/.git/objects" -type f | \
+while read -r file; do
+    if echo "$file" | grep -Eq '\.idx$'; then
+        git show-index < "$file" | awk '{print $2}'
+    elif echo "$file" | grep -Eq '[0-9a-f]{38}$'; then
+        echo "$(basename "$(dirname "$file")")$(basename "$file")"
+    fi
+done | \
+while read -r hash; do
+    if [ "$(git cat-file -t "$hash")" = commit ]; then
+        echo "$hash"
+    fi
+done