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MIT

A few useful git hooks to integrate with pre-commit.

Hooks specific to a language, or with more dependencies have been extracted into separate repos:

Usage

-   repo: https://github.com/Lucas-C/pre-commit-hooks
    rev: v1.1.9
    hooks:
    -   id: forbid-crlf
    -   id: remove-crlf
    -   id: forbid-tabs
    -   id: remove-tabs
        args: [ '--whitespaces-count', '2' ]  # defaults to: 4
    -   id: insert-license
        files: \.groovy$
        args:
        - --license-filepath
        - src/license_header.txt          # defaults to: LICENSE.txt
        - --comment-style
        - //                              # defaults to: #

insert-license

Comment styles

The following styles can be used for example:

  • For Java / Javascript / CSS/ C / C++ (multi-line comments) set /*| *| */.
  • For Java / Javascript / CSS/ C / C++ (single line comments) set //.
  • For HTML files: <!--| ~| -->.
  • For Python: #
  • For Jinja templates: '{#||#}'

How to specify in how many lines to search for the license header in each file

You can add --detect-license-in-X-top-lines=<X> to search for license in top X lines (default 5)

Removing old license and replacing it with a new one

In case you want to remove the comment headers introduced by insert-license hook, e.g. because you want to change the wording of your LICENSE.txt and update the comments in your source files:

  1. temporarily add the --remove-header arg in your .pre-commit-config.yaml
  2. run the hook on all your files: pre-commit run insert-license --all-files
  3. remove the --remove-header arg and update your LICENSE.txt
  4. re-run the hook on all your files

Fuzzy license matching

In some cases your license files can contain several slightly different variants of the license - either containing slight modifications or differently broken lines of the license text. By default the plugin does exact matching when searching for the license and in such case it will add second licence on top - leaving the non-perfectly matched one in the source code. You can prevent that and add --fuzzy-match-generates-todo flag in which case fuzzy matching is performed based on Levenshtein distance of set of tokens in expected and actual license text (partial match in two sets is used). The license is detected if the ratio is > than --fuzzy-ratio-cut-off parameter (default 85) - ration corresponds roughly to how well the expected and actual license match (scale 0 - 100). Additionally --fuzzy-match-extra-lines-to-check lines in this case are checked for the licence in case it has lines broken differently and takes more lines (default 3).

If a fuzzy match is found (and no exact match), a TODO comment is inserted at the beginning of the match found. The comment inserted can be overridden by --fuzzy-match-todo-comment=<COMMENT> flag. By default it is TODO: This license is not consistent with license used in the project Additionally instructions on what to do are inserted in this case. By default instructions are: Delete the inconsistent license and above line and rerun pre-commit to insert a good license.. You can change it via --fuzzy-match-todo-instructions argument of the hook.

When the TODO comment is committed, pre-commit will fail with appropriate message. The check will fails systematically if the --fuzzy-match-generates-todo flag is set or not. You will need to remove the TODO comment and licence so that it gets re-added in order to get rid of the error.

License insertion can be skipped altogether if the file contains the 'SKIP LICENSE INSERTION' in the first X top lines. This can also be overridden by --skip-license-insertion-comment=<COMMENT> flag.

Handy shell functions

pre_commit_all_cache_repos () {  # Requires sqlite3
    sqlite3 -header -column ~/.cache/pre-commit/db.db < <(echo -e ".width 50\nSELECT repo, ref, path FROM repos ORDER BY repo;")
}

pre_commit_local_cache_repos () {  # Requires PyYaml & sqlite3
    < $(git rev-parse --show-toplevel)/.pre-commit-config.yaml \
        python -c "from __future__ import print_function; import sys, yaml; print('\n'.join(h['repo']+' '+h['sha'] for h in yaml.load(sys.stdin) if h['repo'] != 'local'))" \
        | while read repo sha; do
            echo $repo
            sqlite3 ~/.cache/pre-commit/db.db "SELECT ref, path FROM repos WHERE repo = '$repo' AND ref = '$sha';"
            echo
        done
}

pre_commit_db_rm_repo () {  # Requires sqlite3
    local repo=${1?'Missing parameter'}
    local repo_path=$(sqlite3 ~/.cache/pre-commit/db.db "SELECT path FROM repos WHERE repo LIKE '%${repo}%';")
    if [ -z "$repo_path" ]; then
        echo "No repository known for repo $repo"
        return 1
    fi
    rm -rf "$repo_path"
    sqlite3 ~/.cache/pre-commit/db.db "DELETE FROM repos WHERE repo LIKE '%${repo}%';";
}

Useful local hooks

Forbid / remove some unicode characters

-   repo: local
    hooks:
    -   id: forbid-unicode-non-breaking-spaces
        name: Detect unicode non-breaking space character U+00A0 aka M-BM-
        language: system
        entry: perl -ne 'print if $m = /\xc2\xa0/; $t ||= $m; END{{exit $t}}'
        files: ''
    -   id: remove-unicode-non-breaking-spaces
        name: Remove unicode non-breaking space character U+00A0 aka M-BM-
        language: system
        entry: perl -pi* -e 's/\xc2\xa0/ /g && ($t = 1) && print STDERR $_; END{{exit
            $t}}'
        files: ''
    -   id: forbid-en-dashes
        name: Detect the EXTREMELY confusing unicode character U+2013
        language: system
        entry: perl -ne 'print if $m = /\xe2\x80\x93/; $t ||= $m; END{{exit $t}}'
        files: ''
    -   id: remove-en-dashes
        name: Remove the EXTREMELY confusing unicode character U+2013
        language: system
        entry: perl -pi* -e 's/\xe2\x80\x93/-/g && ($t = 1) && print STDERR $_; END{{exit
            $t}}'
        files: ''

Bash syntax validation

-   repo: local
    hooks:
    -   id: check-bash-syntax
        name: Check Shell scripts syntax corectness
        language: system
        entry: bash -n
        files: \.sh$

For Groovy-like Jenkins pipelines

-   repo: local
    hooks:
    -   id: forbid-abstract-classes-and-traits
        name: Ensure neither abstract classes nor traits are used
        language: pygrep
        entry: "^(abstract|trait) "
        files: ^src/.*\.groovy$

Rationale: abstract classes & traits do not work in Jenkins pipelines : cf. https://issues.jenkins-ci.org/browse/JENKINS-39329 & https://issues.jenkins-ci.org/browse/JENKINS-46145

-   repo: local
    hooks:
    -   id: force-JsonSlurperClassic
        name: Ensure JsonSlurperClassic is used instead of non-serializable JsonSlurper
        language: pygrep
        entry: JsonSlurper[^C]
        files: \.groovy$

Rationale: cf. http://stackoverflow.com/a/38439681/636849

-   repo: local
    hooks:
        -   id: Jenkinsfile-linter
            name: Check Jenkinsfile following the scripted-pipeline syntax using Jenkins API
            files: Jenkinsfile
            language: system
            entry: sh -c '! curl --silent $JENKINS_URL/job/MyPipelineName/job/master/1/replay/checkScriptCompile --user $JENKINS_USER:$JENKINS_TOKEN --data-urlencode value@Jenkinsfile | grep -F "\"status\":\"fail\""'

Note: the $JENKINS_TOKEN can be retrieved from $JENKINS_URL/user/$USER_NAME/configure

Beware, in 1 case on 6 I faced this unsolved bug with explictely-loaded libraries: https://issues.jenkins-ci.org/browse/JENKINS-42730

Also, there is also a linter for the declarative syntax: https://jenkins.io/doc/book/pipeline/development/#linter

Forbid some Javascript keywords for browser retrocompatibility issues

-   repo: local
    hooks:
    -   id: js-forbid-const
        name: The const keyword is not supported by IE10
        language: pygrep
        entry: "const "
        files: \.js$
    -   id: js-forbid-let
        name: The let keyword is not supported by IE10
        language: pygrep
        entry: "let "
        files: \.js$

CSS

-   repo: local
    hooks:
    -   id: css-forbid-px
        name: In CSS files, use rem or % over px
        language: pygrep
        entry: px
        files: \.css$
    -   id: ot-sanitize-fonts
        name: Calling ot-sanitise on otf/ttf/woff/woff2 font files
        language: system
        entry: sh -c 'type ot-sanitise >/dev/null && for font in "$@"; do echo "$font"; ot-sanitise "$font"; done || echo "WARNING Command ot-sanitise not found - skipping check"'
        files: \.(otf|ttf|woff|woff2)$

Some Angular 1.5 checks

-   repo: local
    hooks:
    -   id: angular-forbid-apply
        name: In AngularJS, use $digest over $apply
        language: pygrep
        entry: \$apply
        files: \.js$
    -   id: angular-forbid-ngrepeat-without-trackby
        name: In AngularJS, ALWAYS use 'track by' with ng-repeat
        language: pygrep
        entry: ng-repeat(?!.*track by)
        files: \.html$
    -   id: angular-forbid-ngmodel-with-no-dot
        name: In AngularJS, "Whenever you have ng-model there's gotta be a dot in
            there somewhere"
        language: pygrep
        entry: ng-model="?[^.]+[" ]
        files: \.html$

Development

Releasing a new version

  1. edit version in setup.py, README.md & .pre-commit-config.yaml
  2. git commit -nam "Version bump to $version" && git tag $version && git push && git push --tags
MIT License Copyright (c) 2019 Lucas Cimon Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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