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diff --git a/_tils/2020-08-28-grep-online-repositories.md b/_tils/2020-08-28-grep-online-repositories.md deleted file mode 100644 index 8b3b63f..0000000 --- a/_tils/2020-08-28-grep-online-repositories.md +++ /dev/null @@ -1,139 +0,0 @@ ---- - -title: Grep online repositories - -date: 2020-08-28 - -layout: post - -lang: en - -ref: grep-online-repositories - -eu_categories: git - ---- - -I often find interesting source code repositories online that I want to grep for -some pattern but I can't, because either: - -- the repository is on [cgit][cgit] or a similar code repository that doesn't - allow search in files, or; -- the search function is really bad, and doesn't allow me to use regular expressions for searching patterns in the code. - -[cgit]: https://git.zx2c4.com/cgit/ - -Here's a simple script that allows you to overcome that problem easily: - -```shell -#!/usr/bin/env bash -set -eu - -end="\033[0m" -red="\033[0;31m" -red() { echo -e "${red}${1}${end}"; } - -usage() { - red "Missing argument $1.\n" - cat <<EOF -Usage: - $0 <REGEX_PATTERN> <REPOSITORY_URL> - - Arguments: - REGEX_PATTERN Regular expression that "git grep" can search - REPOSITORY_URL URL address that "git clone" can download the repository from - -Examples: - Searching "make get-git" in cgit repository: - git search 'make get-git' https://git.zx2c4.com/cgit/ - git search 'make get-git' https://git.zx2c4.com/cgit/ -- \$(git rev-list --all) -EOF - exit 2 -} - - -REGEX_PATTERN="${1:-}" -REPOSITORY_URL="${2:-}" -[[ -z "${REGEX_PATTERN}" ]] && usage 'REGEX_PATTERN' -[[ -z "${REPOSITORY_URL}" ]] && usage 'REPOSITORY_URL' - -mkdir -p /tmp/git-search -DIRNAME="$(echo "${REPOSITORY_URL%/}" | rev | cut -d/ -f1 | rev)" -if [[ ! -d "/tmp/git-search/${DIRNAME}" ]]; then - git clone "${REPOSITORY_URL}" "/tmp/git-search/${DIRNAME}" -fi -pushd "/tmp/git-search/${DIRNAME}" - -shift 3 || shift 2 # when "--" is missing -git grep "${REGEX_PATTERN}" "${@}" -``` - -It is a wrapper around `git grep` that downloads the repository when missing. -Save in a file called `git-search`, make the file executable and add it to your -path. - -Overview: - -- *lines 1~2*: - - Bash shebang and the `set -eu` options to exit on error or undefined - variables. - -- *lines 4~30*: - - Usage text to be printed when providing less arguments than expected. - -- *line 33*: - - Extract the repository name from the URL, removing trailing slashes. - -- *lines 34~37*: - - Download the repository when missing and go to the folder. - -- *line 39*: - - Make the variable `$@` contain the rest of the unused arguments. - -- *line 40*: - - Perform `git grep`, forwarding the remaining arguments from `$@`. - -Example output: -```shell -$ git search 'make get-git' https://git.zx2c4.com/cgit/ -Clonage dans '/tmp/git-search/cgit'... -remote: Enumerating objects: 542, done. -remote: Counting objects: 100% (542/542), done. -remote: Compressing objects: 100% (101/101), done. -warning: object 51dd1eff1edc663674df9ab85d2786a40f7ae3a5: gitmodulesParse: could not parse gitmodules blob -remote: Total 7063 (delta 496), reused 446 (delta 441), pack-reused 6521 -Réception d'objets: 100% (7063/7063), 8.69 Mio | 5.39 Mio/s, fait. -Résolution des deltas: 100% (5047/5047), fait. -/tmp/git-search/cgit ~/dev/libre/songbooks/docs -README: $ make get-git - -$ git search 'make get-git' https://git.zx2c4.com/cgit/ -/tmp/git-search/cgit ~/dev/libre/songbooks/docs -README: $ make get-git -``` - -Subsequent greps on the same repository are faster because no download is needed. - -When no argument is provided, it prints the usage text: -```shell -$ git search -Missing argument REGEX_PATTERN. - -Usage: - /home/andreh/dev/libre/dotfiles/scripts/ad-hoc/git-search <REGEX_PATTERN> <REPOSITORY_URL> - - Arguments: - REGEX_PATTERN Regular expression that "git grep" can search - REPOSITORY_URL URL address that "git clone" can download the repository from - -Examples: - Searching "make get-git" in cgit repository: - git search 'make get-git' https://git.zx2c4.com/cgit/ - git search 'make get-git' https://git.zx2c4.com/cgit/ -- $(git rev-list --all) -``` |