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64 lines
2 KiB
Markdown
64 lines
2 KiB
Markdown
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# dupl [](https://travis-ci.org/mibk/dupl)
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**dupl** is a tool written in Go for finding code clones. So far it can find clones only
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in the Go source files. The method uses suffix tree for serialized ASTs. It ignores values
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of AST nodes. It just operates with their types (e.g. `if a == 13 {}` and `if x == 100 {}` are
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considered the same provided it exceeds the minimal token sequence size).
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Due to the used method dupl can report so called "false positives" on the output. These are
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the ones we do not consider clones (whether they are too small, or the values of the matched
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tokens are completely different).
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## Installation
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```bash
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go get -u github.com/golangci/dupl
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```
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## Usage
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```
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Usage of dupl:
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dupl [flags] [paths]
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Paths:
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If the given path is a file, dupl will use it regardless of
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the file extension. If it is a directory it will recursively
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search for *.go files in that directory.
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If no path is given dupl will recursively search for *.go
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files in the current directory.
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Flags:
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-files
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read file names from stdin one at each line
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-html
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output the results as HTML, including duplicate code fragments
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-plumbing
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plumbing (easy-to-parse) output for consumption by scripts or tools
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-t, -threshold size
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minimum token sequence size as a clone (default 15)
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-vendor
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check files in vendor directory
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-v, -verbose
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explain what is being done
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Examples:
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dupl -t 100
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Search clones in the current directory of size at least
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100 tokens.
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dupl $(find app/ -name '*_test.go')
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Search for clones in tests in the app directory.
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find app/ -name '*_test.go' |dupl -files
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The same as above.
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```
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## Example
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The reduced output of this command with the following parameters for the [Docker](https://www.docker.com) source code
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looks like [this](http://htmlpreview.github.io/?https://github.com/golangci/dupl/blob/master/_output_example/docker.html).
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```bash
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$ dupl -t 200 -html >docker.html
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```
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