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go forwards or backwards in git history
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| #!/usr/bin/env sh | |
| set -eu | |
| print_usage() { | |
| printf 'Usage: %s <prev|next>\n' "${0}" | |
| printf '\tprev: move to the previous commit\n' | |
| printf '\tnext: move to the next commit\n' | |
| } | |
| if [ "${#}" -ne 1 ]; then | |
| print_usage | |
| exit 1 | |
| fi | |
| case "${1}" in | |
| 'prev') | |
| current="$(git rev-parse HEAD)" | |
| history="$(git rev-list --children --all)" | |
| line="$(echo "${history}" | grep -Em 1 "\w\s${current}$" || true)" | |
| if [ "${line}" = '' ]; then | |
| printf 'Already at the first commit.\n' | |
| exit 1 | |
| fi | |
| prev="$(echo "${line}" | cut -d ' ' -f 1)" | |
| git checkout "${prev}" | |
| ;; | |
| 'next') | |
| current="$(git rev-parse HEAD)" | |
| history="$(git rev-list --children --all)" | |
| line="$(echo "${history}" | grep -E "^${current}")" | |
| next="$(echo "${line}" | cut -d ' ' -f 2)" | |
| if [ "${next}" = "${current}" ]; then | |
| printf 'Already at the last commit.\n' | |
| exit 1 | |
| fi | |
| git checkout "${next}" | |
| ;; | |
| *) | |
| printf 'Unknown command: %s.\n' "${1}" | |
| print_usage | |
| exit 1 | |
| ;; | |
| esac |
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