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# enry [![GoDoc](https://godoc.org/gopkg.in/src-d/enry.v1?status.svg)](https://godoc.org/gopkg.in/src-d/enry.v1) [![Build Status](https://travis-ci.org/src-d/enry.svg?branch=master)](https://travis-ci.org/src-d/enry) [![codecov](https://codecov.io/gh/src-d/enry/branch/master/graph/badge.svg)](https://codecov.io/gh/src-d/enry)
File programming language detector and toolbox to ignore binary or vendored files. *enry*, started as a port to _Go_ of the original [linguist](https://github.com/github/linguist) _Ruby_ library, that has an improved *performance of 100x*.
File programming language detector and toolbox to ignore binary or vendored files. *enry*, started as a port to _Go_ of the original [linguist](https://github.com/github/linguist) _Ruby_ library, that has an improved *2x performance*.
Installation
@ -18,8 +18,9 @@ To build enry's CLI you must run
it generates a binary in the project's root directory called `enry`. You can move this binary to anywhere in your `PATH`.
Examples
--------
------------
```go
lang, safe := enry.GetLanguageByExtension("foo.go")
@ -55,7 +56,7 @@ langs := enry.GetLanguagesByFilename("Gemfile", "<content>", []string{})
CLI
-----------------
------------
You can use enry as a command,
@ -115,7 +116,7 @@ Note that even if enry's CLI is compatible with linguist's, its main point is th
Development
-----------
------------
*enry* re-uses parts of original [linguist](https://github.com/github/linguist) especially data in `languages.yml` to generate internal data structures. In oreder to update to latest upstream run
@ -139,8 +140,40 @@ Using [linguist/samples](https://github.com/github/linguist/tree/master/samples)
* all files for SQL language fall to the classifier because we don't parse this [disambiguator expresion](https://github.com/github/linguist/blob/master/lib/linguist/heuristics.rb#L433) for `*.sql` files right. This expression doesn't comply with the pattern for the rest of [heuristics.rb](https://github.com/github/linguist/blob/master/lib/linguist/heuristics.rb) file.
Benchmarks
------------
Enry's language detection has been compared with Linguist's language detection. In order to do that, linguist's project directory [*linguist/samples*](https://github.com/github/linguist/tree/master/samples) was used as a set of files to run benchmarks against.
Following results were obtained:
![histogram](https://raw.githubusercontent.com/src-c/enry/master/benchmarks/histogram/distribution.jpg)
The histogram represents the number of files for which spent time in language detection was in the range of the time interval indicated in x axis.
So reviewing the comparison enry/linguist, you can see the most of the files were detected in less time than linguist does.
We detected some few cases enry turns slower than linguist. This is due to Golang's regexp engine being slower than Ruby's, which uses [oniguruma](https://github.com/kkos/oniguruma) library, written in C.
You can find scripts and additional information (as software and hardware used, and benchmarks' results per sample file) in [*benchmarks*](https://github.com/src-d/enry/tree/master/benchmarks) directory.
If you want to reproduce the same experiment you can run:
benchmarks/run.sh
from the root's project directory and It runs benchmarks for enry and linguist, parse the output, create csv files and create a histogram (you must have installed [gnuplot](http://gnuplot.info) in your system to get the histogram). It can take to much time, so to run local benchmarks to take a quick look you can run either:
make benchmarks
to get time averages for main detection function and strategies for the whole samples set or:
make benchmarks-samples
if you want see measures by sample file
Why Enry?
---------
------------
In the movie [My Fair Lady](https://en.wikipedia.org/wiki/My_Fair_Lady), [Professor Henry Higgins](http://www.imdb.com/character/ch0011719/?ref_=tt_cl_t2) is one of the main characters. Henry is a linguist and at the very beginning of the movie enjoys guessing the nationality of people based on their accent.
@ -148,6 +181,6 @@ In the movie [My Fair Lady](https://en.wikipedia.org/wiki/My_Fair_Lady), [Profes
License
-------
------------
MIT, see [LICENSE](LICENSE)