[git-pile] Add pullpr wip

bin/git-pullpr

@@ -0,0 +1,89 @@
+#!/bin/bash
+
+set -euo pipefail
+
+if [[ -n "${GIT_PILE_VERBOSE:-}" ]]; then
+  set -x
+fi
+
+if [[ $# -lt 1 ]]; then
+  echo "usage: $0 <sha_to_update>" >&2
+  exit 1
+fi
+
+export GIT_SEQUENCE_EDITOR=true
+
+# determine branch name
+# fetch it
+# pull it
+# take commit(s)? that aren't part of the given sha and --fixup them
+# rebase -i to autosquash them
+readonly commit_to_update=$1
+if ! git cat-file -e "$commit_to_update" 2> /dev/null; then
+  echo "error: invalid commit sha: '$commit_to_update'" >&2
+  exit 1
+fi
+
+branch_name="${GIT_PILE_PREFIX:-}$(git show --no-patch --format=%f "$commit_to_update" | tr '[:upper:]' '[:lower:]')"
+if ! git show-ref --quiet "$branch_name"; then
+  echo "error: branch '$branch_name' doesn't exist" >&2
+  exit 1
+fi
+
+worktree_name=$(git roothash)
+readonly worktree_dir="$HOME/.cache/git-pile/$worktree_name"
+if [[ ! -d "$worktree_dir" ]]; then
+  git worktree add -f "$worktree_dir" "$branch_name"
+else
+  git -C "$worktree_dir" switch "$branch_name"
+fi
+
+_detach_branch() {
+  git -C "$worktree_dir" switch --detach --quiet
+}
+
+trap _detach_branch EXIT
+git -C "$worktree_dir" pull --quiet
+
+
+# branch_with_remote=$(git -C "$worktree_dir" rev-parse --abbrev-ref --symbolic-full-name "@{upstream}")
+# remote_name="${branch_with_remote%%/*}"
+# remote_branch_name="${branch_with_remote#*/}"
+
+# git -C "$worktree_dir" fetch "$remote_name" "$remote_branch_name"
+# if ! git -C "$worktree_dir" diff --quiet "HEAD...@{upstream}"; then
+#   git -C "$worktree_dir" diff "HEAD...@{upstream}"
+#   answer=$(_ask "warning: upstream has new commits, would you like to pull those (or abort)? (y/n) ")
+#   if [[ "$answer" == y ]]; then
+#     git -C "$worktree_dir" pull
+#   else
+#     echo "warning: not updating PR, checkout '$branch_name', pull and try again" >&2
+#     exit 1
+#   fi
+# fi
+
+# if ! git -C "$worktree_dir" cherry-pick "$new_refspec^..$base_refspec"; then
+#   # TODO if you exit in vim with :cq, it asks you if it was successful, i think if you hit yes it will continue even if it's not?
+#   if git -C "$worktree_dir" mergetool; then
+#     git -C "$worktree_dir" cherry-pick --continue
+#   else
+#     git -C "$worktree_dir" cherry-pick --abort
+#     # TODO what do i do? i think we have to reset branch state? maybe just abort cherry pick?
+#     exit 1
+#   fi
+# fi
+
+# if [[ "$squash" == true ]]; then
+#   if [[ "$signoff" == true ]]; then
+#     git -C "$worktree_dir" commit -s --amend --fixup=HEAD~
+#   else
+#     git -C "$worktree_dir" commit --amend --fixup=HEAD~
+#   fi
+#   git -C "$worktree_dir" rebase --interactive --autosquash HEAD~2
+#   git -C "$worktree_dir" push --force-with-lease --quiet || echo "warning: failed to force push '$branch_name'" >&2
+# else
+#   git -C "$worktree_dir" push --quiet || echo "warning: failed to push '$branch_name'" >&2
+# fi
+
+# git rebase --interactive --exec "git commit --amend --fixup '$commit_to_update'" "$new_refspec"^
+# git rebase --interactive --autosquash "$commit_to_update"^