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A fast, drop-in replacement for pygments `get_*()` and `guess_*()` funtions

Project description

A fast, drop-in replacement for pygments get_*() and guess_*() funtions.

The following pygments API functions are currently supplied here:

from pygments_cache import get_lexer_for_filename, guess_lexer_for_filename
from pygments_cache import get_formatter_for_filename, get_formatter_by_name
from pygments_cache import get_style_by_name
from pygments_cache import get_filter_by_name

The cache itself is stored at the location given by the $PYGMENTS_CACHE_FILE environment variable, or by default at ~/.local/share/pygments-cache/ The cache file is created on first use, if it does not already exist.

If a pygements extentsion is not found in the cache, the API functions listed here will fallback to the original pygments version and the extension will be added to the cache for future use. That is, the cache will discover and save new extensions as you would expect.

If you ever need to reset the cache for some reason, simply delete the $PYGMENTS_CACHE_FILE from your file system. The next time you call one of the API functions, the cache will be regenerated. Alternatively, you may manually rebuild the cache (after removing the file) with the load_or_build() function.

The cache itself is fully accessible as the pygments_cache.CACHE dict.

This project is implement as single file, making it easy to redistribute. Feel free to copy this file to your own project!


NOTE: All of the following tests were in xonsh.

TL;DR Table: All timings in seconds.

pygments 0.48 3.09e-3
pygments_cache 0.03 9.90e-6
speedup 16x 306x

From a cold start (i.e. the first import and use), pygments can take a long time (about half a second) to get a single lexer, as seen below:

$ time -p python -c! from pygments.lexers import get_lexer_for_filename; get_lexer_for_filename('index.html')
real 0.48
user 0.46
sys 0.01

The pygments-cache project speeds this up considerably, assuming the cache file already exists. The timing can be seen here:

$ time -p python -c! from pygments_cache import get_lexer_for_filename; get_lexer_for_filename('index.html')
real 0.03
user 0.03
sys 0.00

This represents a 16x speedup. However, most of the 0.03 sec is actually coming from Python itself starting up and shutting down.

A more fair test is to look at how long the get_lexer_for_filename() function takes to run once Python has been started and the function imported.

From a hot start, pygments itself tok about 3 ms, as seen below:

$ from pygments.lexers import get_lexer_for_filename
$ timeit! get_lexer_for_filename('index.html')
100 loops, best of 3: 3.09 ms per loop

Alternatively, pygments-cache took only 9.9 µs, as seen below.

$ from pygments_cache import get_lexer_for_filename
$ timeit! get_lexer_for_filename('index.html')
100000 loops, best of 3: 9.9 µs per loop

This is a speedup of 306x!

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