cccv's Introduction

cccv

cccv finds what parts of a diff were copy/pasted from elsewhere in the project.

Why? Because copy/pasted code is impossible to spot at code review time.

Installation

Use Docker image:

% git diff | docker run --rm -i artemave/cccv

Or, compile cccv binary (needs Docker):

% git clone https://github.com/artemave/cccv.git && cd cccv
% make

Or, if you have Golang installed:

% go get github.com/artemave/cccv

Usage

% git checkout pr1
% git diff master | cccv

For fine tuning, drop .cccv.yml into the root of your project. Example:

exclude-lines:
  - "require\\(['\"].+['\"]\\);$" # will exclude `var x = require('y');`
                                  # this regexp gets parsed by YAML first, hence extra escaping for \ and "
  - console.log

exclude-files:
  - "README.*" # regexp, NOT a glob

min-hunk-size: 3 # mininum number of consecutive duplicate
                 # lines to consider relevant; default 2

min-line-length: 15 # minimum line length (bar leading/trailing tabs and spaces)
                    # to be considered relevant; default 10

Limitations

Relies on default git diff output format.

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cccv's Issues

.cccv.yml examples

Really handy tool! Could you expand on the config examples in the README?

Is exclude-lines supposed to be regex as well, or something else?

I'm trying to exclude lines like var x = require('y'); so entered .+require$['"].+['"]$;$ and get error: YAML error: line 1: found unknown escape character

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