Find duplicate code with CPD
A copy/paste detector
I’m sure that you know PMD, the famous static code analyzer. But have you ever tried CPD?
CPD belongs to PMD. You have to install PMD first.
$ cd $HOME $ wget https://github.com/pmd/pmd/releases/download/pmd_releases%2F5.8.1/pmd-bin-5.8.1.zip $ unzip pmd-bin-5.8.1.zip $ alias pmd="$HOME/tools/pmd-bin-5.8.1/bin/run.sh pmd" $ alias cpd="$HOME/tools/pmd-bin-5.8.1/bin/run.sh cpd"
Command line usage
I give you some examples here.
cpd --minimum-tokens 20 --language java --files src > cpd-20.txt cpd --minimum-tokens 20 --format csv --files src > cpd-20.csv
minimum-tokens (minimum duplicate size) and files (source directory) are the only required options. Then you can specify the language and the report format. What I really like is the csv format. I sort the results in Excel (tokens) and attack the Top 5 duplicates.
CPD helps you to find copied and pasted code. Duplicate code tells you how to improve the code structure.