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https://github.com/penpot/penpot.git
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75 lines
2.0 KiB
Bash
Executable File
75 lines
2.0 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -euo pipefail
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# detect-target-branch
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#
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# Determines the target branch for a PR of the current branch.
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#
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# Uses git name-rev to find the nearest ref (branch/tag) that is an ancestor of
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# HEAD, falling back to a graph walk if name-rev returns the current branch.
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#
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# Pure local — no remote, no SSH, no network. Works even when the current
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# branch shares its tip commit with the target (not yet diverged).
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#
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# Usage:
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# tools/detect-target-branch # print branch name
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# tools/detect-target-branch --verbose # print "branch~N"
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#
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# Exit status:
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# 0 — target found
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# 1 — no target found (orphan commit, no other branches)
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verbose=false
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for arg do
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case "$arg" in
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--verbose|-v) verbose=true ;;
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--name-only) ;;
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--help|-h)
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sed -n '/^#/,/^$/p' "$0" | sed 's/^# //; s/^#$//'
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exit 0
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;;
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*)
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echo "Unknown option: $arg" >&2
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echo "Usage: $(basename "$0") [--verbose|-v] [--name-only] [--help|-h]" >&2
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exit 1
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;;
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esac
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done
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current=$(git rev-parse --abbrev-ref HEAD)
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# Use name-rev to find the nearest ref — it has smart tie-breaking
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raw=$(git name-rev --name-only HEAD 2>/dev/null)
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target=${raw%%~[0-9]*} # strip ~N distance suffix
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# If name-rev returned the current branch itself, walk backwards
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if [ "$target" = "$current" ] || [ -z "$target" ]; then
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target=$(git rev-list HEAD | while read commit; do
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branch=$(git branch --points-at="$commit" --format='%(refname:short)' 2>/dev/null \
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| grep -v "^$current$" \
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| head -1 || true)
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if [ -n "$branch" ]; then
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echo "$branch"
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break
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fi
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done || true)
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if [ -z "$target" ]; then
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echo "error: unable to determine target branch" >&2
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exit 1
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fi
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fi
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if [ "$verbose" = true ]; then
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target_commit=$(git rev-parse "$target" 2>/dev/null || true)
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if [ -n "$target_commit" ]; then
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distance=$(git rev-list --count HEAD ^"$target_commit" 2>/dev/null || echo "0")
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echo "${target}~${distance}"
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else
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echo "${target}~?"
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fi
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else
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echo "$target"
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fi
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