zyedidia / ftdetect

A filetype detection library

ftdetect

ftdetect is a library for detecting the filetype of source code files (what programming language the file is written in). It primarily uses the file extension and file name to determine the filetype, but also may use the first line of the file (the header) for additional information (for example, #!/bin/bash on the first line is a good indication of a shell file, even if there is no extension).

The library is optimized for very fast detection in the common case and supports saving the detection data structure to a file for very fast loading/startup time.

A default set of detectors for 135 different languages is provided. If you would like to do the embedding yourself you can specify the ftdetect_custom build tag to avoid embedding the default detectors.

The ./cmd/detect directory contains an example tool which uses the default detectors to perform file detection on the first argument to the CLI application.