update

inc/git-update.inc

@@ -0,0 +1,77 @@
+#!/usr/bin/env bash
+# Shared non-destructive Git update helpers for TA-ProxMenu.
+
+TAPM_GIT_WORKTREE_DIRTY() {
+	local repository="$1"
+
+	[[ -n "$(git -C "$repository" status --porcelain --untracked-files=normal 2>/dev/null)" ]]
+}
+
+TAPM_GIT_FETCH_BRANCH() {
+	local repository="$1"
+	local branch="$2"
+	local timeout_seconds="${3:-30}"
+
+	timeout "$timeout_seconds" git -C "$repository" fetch --prune origin \
+		"+refs/heads/${branch}:refs/remotes/origin/${branch}"
+}
+
+TAPM_GIT_RELATION() {
+	local repository="$1"
+	local local_ref="$2"
+	local remote_ref="$3"
+	local local_commit
+	local remote_commit
+
+	local_commit="$(git -C "$repository" rev-parse --verify "${local_ref}^{commit}" 2>/dev/null)" ||
+		return 1
+	remote_commit="$(git -C "$repository" rev-parse --verify "${remote_ref}^{commit}" 2>/dev/null)" ||
+		return 1
+
+	if [[ "$local_commit" == "$remote_commit" ]]; then
+		printf 'current\n'
+	elif git -C "$repository" merge-base --is-ancestor "$local_commit" "$remote_commit"; then
+		printf 'behind\n'
+	elif git -C "$repository" merge-base --is-ancestor "$remote_commit" "$local_commit"; then
+		printf 'ahead\n'
+	else
+		printf 'diverged\n'
+	fi
+}
+
+TAPM_GIT_BRANCH_STATE() {
+	local repository="$1"
+	local branch="$2"
+	local current_branch
+
+	[[ -d "${repository}/.git" ]] || {
+		printf 'unavailable\n'
+		return 1
+	}
+
+	current_branch="$(git -C "$repository" branch --show-current 2>/dev/null)"
+	if [[ -z "$current_branch" ]]; then
+		printf 'detached\n'
+		return 0
+	fi
+	if [[ "$current_branch" != "$branch" ]]; then
+		printf 'wrong-branch\n'
+		return 0
+	fi
+	if TAPM_GIT_WORKTREE_DIRTY "$repository"; then
+		printf 'dirty\n'
+		return 0
+	fi
+
+	TAPM_GIT_RELATION "$repository" HEAD "refs/remotes/origin/${branch}" || {
+		printf 'unavailable\n'
+		return 1
+	}
+}
+
+TAPM_GIT_FAST_FORWARD() {
+	local repository="$1"
+	local branch="$2"
+
+	git -C "$repository" merge --ff-only "refs/remotes/origin/${branch}"
+}