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License GitHub issues

metrics

The original idea of metrics was a platform that can be extended with many different metrics. At the time I will focus only on SLOC and McCabe complexity metrics. metrics is build in a way to support many, many languages supported languages. Currently we test support for Python, C, C++, Go and JavaScript.

The SLOC metric counts the lines but excludes empty lines and comments. This is sometimes referred to as the source lines of code (SLOC). In literature this is often also referred as physical lines of code. I simplified it to something which to my understanding is the common denominator for the metric packages I looked into (CCCC, SLOCCount, PyMetrics, Eclipse-Metrics, Ohcount).

installation

metrics is released as a Python package so you can apply the std. Python mechanism for installation:

$ pip install metrics

Some plugins are available to collect information from a typical development environment. If you have a similar environment you can install them as well in one go:

$ pip install metrics metrics.bumpversion metrics.gitinfo metrics.pylint metrics.pytest-cov

Sample use

Get an overview on a package (number of files, used languages, and metrics):

$ metrics **/*
Metrics Summary:
Files                       Language        SLOC Comment McCabe 
----- ------------------------------ ----------- ------- ------ 
    6                              C          14       3      0 
    3                            C++        1114     236    108 
    1                            INI           5       0      0 
    2                           Java          27       8      1 
    3                     JavaScript        1453      54    169 
    1                       markdown           7       0      0 
   18                         Python        1038     425    238 
   11                      Text only           0       0      0 
----- ------------------------------ ----------- ------- ------ 
   45                          Total        3658     726    516 

Note how you can use glob file pattern or a list of files...

Usage help:

$ metrics --help
Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  -f IN_FILE_LIST, --files=IN_FILE_LIST
                        File containing list of path names to modules for
                        analysis.
  -q, --quiet           suppress normal summary output to stdout. (Default is
                        False)
  --format=OUTPUT_FORMAT_STR
                        Choose an output format for a parser to read. Valid
                        choices: xml, csv, json

Get a detailed report:

$ metrics -q --format=csv metrics/metrics.py
filename,sloc,comments,ratio_comment_to_code,mccabe,language
metrics/metrics.py,21,14,0.67,1,Python

Same detailed report but output to csv file:

$ metrics -q --format=csv metrics/metrics.py > output.csv

Plugins for metrics

Some plugins are available to collect information from a typical development environment. Please visit the plugin page for details:

Sample ".metrics" file results (with plugins installed)

{
    "build": {
        "active_branch": "master",
        "committed_datetime": "2018-04-28T12:19:14+02:00",
        "committed_ts": 1524910754,
        "committers": [
            "mark"
        ],
        "origin": "git@github.com:markfink/metrics.gitinfo.git",
        "sha": "4c355c2f6ffef88252e565f6ef5006468e410187",
        "sha_start": "f7ba6f27ee8c34991acd3cd6ef14c8bd6ed9c34e",
        "summary": "Bump version: 0.0.4 \u2192 0.0.5",
        "version": "0.0.5"
    },
    "files": {
        "metrics_gitinfo/__init__.py": {
            "age_days": 25.81871527777778,
            "block_positions": [],
            "change_frequency": 6,
            "comments": 1,
            "committers_count": 1,
            "language": "Python",
            "lines_added": [
                3
            ],
            "lines_deleted": [
                3
            ],
            "mccabe": 0,
            "pylint_score": 5.0,
            "ratio_comment_to_code": 0.5,
            "sloc": 2,
            "test_coverage": 0.0,
            "test_missing": "2-3"
        },
        "metrics_gitinfo/file_info.py": {
            "age_days": 0.01931712962962963,
            "block_positions": [
                {
                    "end": 17,
                    "name": "get_file_info",
                    "start": 5,
                    "type": "Function"
                }
            ],
            "change_frequency": 1,
            "comments": 4,
            "committers_count": 1,
            "language": "Python",
            "mccabe": 1,
            "pylint_score": 10.0,
            "ratio_comment_to_code": 0.44,
            "sloc": 9,
            "test_coverage": 0.0,
            "test_missing": "2-17"
        },
        "metrics_gitinfo/git_diff_muncher.py": {
            "age_days": 24.06056712962963,
            "block_positions": [
                {
                    "end": 17,
                    "name": "GitDiffError",
                    "start": 10,
                    "type": "Class"
                },
                {
                    "end": 81,
                    "name": "parse_diff_lines",
                    "start": 18,
                    "type": "Function"
                },
                {
                    "end": 111,
                    "name": "_parse_hunk_line",
                    "start": 82,
                    "type": "Function"
                }
            ],
            "change_frequency": 1,
            "comments": 50,
            "committers_count": 1,
            "language": "Python",
            "mccabe": 15,
            "pylint_score": 9.56,
            "ratio_comment_to_code": 1.02,
            "sloc": 49,
            "test_coverage": 0.0,
            "test_missing": "2-129"
        },
        "metrics_gitinfo/gitinfo.py": {
            "age_days": 25.81871527777778,
            "block_positions": [
                {
                    "end": 17,
                    "name": "get_file_processors",
                    "start": 13,
                    "type": "Function"
                },
                {
                    "end": 22,
                    "name": "get_build_processors",
                    "start": 18,
                    "type": "Function"
                },
                {
                    "end": 113,
                    "methods": [
                        {
                            "end": 35,
                            "name": "_get_commits_contained",
                            "start": 31,
                            "type": "Function"
                        },
                        {
                            "end": 41,
                            "name": "_get_source_target",
                            "start": 36,
                            "type": "Function"
                        },
                        {
                            "end": 56,
                            "name": "_extract_info",
                            "start": 52,
                            "type": "Function"
                        },
                        {
                            "end": 88,
                            "name": "reset",
                            "start": 84,
                            "type": "Function"
                        },
                        {
                            "end": 105,
                            "name": "process_file",
                            "start": 89,
                            "type": "Function"
                        },
                        {
                            "end": 108,
                            "name": "get_metrics",
                            "start": 106,
                            "type": "Function"
                        },
                        {
                            "end": 113,
                            "name": "get_build_metrics",
                            "start": 109,
                            "type": "Function"
                        }
                    ],
                    "name": "GitMetric",
                    "start": 23,
                    "type": "Class"
                }
            ],
            "change_frequency": 7,
            "comments": 9,
            "committers_count": 1,
            "language": "Python",
            "lines_added": [
                96
            ],
            "lines_deleted": [
                66,
                94,
                97
            ],
            "mccabe": 8,
            "pylint_score": 9.06,
            "ratio_comment_to_code": 0.11,
            "sloc": 83,
            "test_coverage": 0.0,
            "test_missing": "2-113"
        },
        "tests/__init__.py": {
            "age_days": 24.099988425925925,
            "block_positions": [
                {
                    "end": 10,
                    "name": "here",
                    "start": 9,
                    "type": "Function"
                }
            ],
            "change_frequency": 1,
            "comments": 1,
            "committers_count": 1,
            "language": "Python",
            "mccabe": 0,
            "pylint_score": 3.33,
            "ratio_comment_to_code": 0.17,
            "sloc": 6,
            "test_coverage": 83.33,
            "test_missing": "10"
        },
        "tests/test_metrics_gitinfo.py": {
            "age_days": 22.091909722222223,
            "block_positions": [
                {
                    "end": 19,
                    "name": "tempfolder",
                    "start": 11,
                    "type": "Function"
                },
                {
                    "end": 29,
                    "name": "test_metrics_gitinfo_no_git_repo",
                    "start": 20,
                    "type": "Function"
                },
                {
                    "end": 39,
                    "name": "test_metrics_gitinfo",
                    "start": 30,
                    "type": "Function"
                },
                {
                    "end": 47,
                    "name": "test_metrics_gitinfo_no_lastrun",
                    "start": 40,
                    "type": "Function"
                }
            ],
            "change_frequency": 1,
            "comments": 2,
            "committers_count": 1,
            "language": "Python",
            "mccabe": 6,
            "pylint_score": 4.64,
            "ratio_comment_to_code": 0.07,
            "sloc": 29,
            "test_coverage": 100.0
        }
    }
}

Acknowledgements

  • codebase originally based on grop.py by Jurgen Hermann (2001)
  • also based on PyMetrics by Reg. Charney to do Python complexity measurements (2007)
  • we use some sample programming language files for the test cases from Ohcount and Firefox

License

Copyright (c) 2017, 2018 Fink Labs GmbH and others. metrics is released under the MIT License (see MIT_LICENSE).

About

produces metrics for Python, C, C++, Go and Javascript programs (plugins for pylint, pytest-cov, and git available)

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