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#!/bin/bash
# Best effort auto-pygmentization with transparent decompression
# by Reuben Thomas 2008-2015
# This program is in the public domain.
# Strategy: first see if pygmentize can find a lexer; if not, ask file; if that finds nothing, fail
# Set the environment variable PYGMENTIZE_OPTS or pass options before the file path to configure pygments.
# This program can be used as a .lessfilter for the less pager to auto-color less's output
file="${!#}" # last argument
options=${@:1:$(($#-1))} # handle others args as options to pass to pygmentize
file_common_opts="--brief --dereference"
lexer=$(pygmentize -N "$file")
if [[ "$lexer" == text ]]; then
unset lexer
case $(file --mime-type --uncompress $file_common_opts "$file") in
application/xml|image/svg+xml) lexer=xml;;
application/javascript) lexer=javascript;;
text/html) lexer=html;;
text/troff) lexer=nroff;;
text/x-asm) lexer=nasm;;
text/x-awk) lexer=awk;;
text/x-c) lexer=c;;
text/x-c++) lexer=cpp;;
text/x-diff) lexer=diff;;
text/x-fortran) lexer=fortran;;
text/x-gawk) lexer=gawk;;
text/x-java) lexer=java;;
text/x-lisp) lexer=common-lisp;;
text/x-lua) lexer=lua;;
text/x-makefile) lexer=make;;
text/x-msdos-batch) lexer=bat;;
text/x-nawk) lexer=nawk;;
text/x-pascal) lexer=pascal;;
text/x-perl) lexer=perl;;
text/x-php) lexer=php;;
text/x-po) lexer=po;;
text/x-python) lexer=python;;
text/x-ruby) lexer=ruby;;
text/x-shellscript) lexer=sh;;
text/x-tcl) lexer=tcl;;
text/x-tex|text/x-texinfo) lexer=latex;; # FIXME: texinfo really needs its own lexer
# Types that file outputs which pygmentize didn't support as of file 5.20, pygments 2.0
# text/calendar
# text/inf
# text/PGP
# text/rtf
# text/texmacs
# text/vnd.graphviz
# text/x-bcpl
# text/x-info
# text/x-m4
# text/x-vcard
# text/x-xmcd
text/plain) # special filenames. TODO: insert more
case $(basename "$file") in
.zshrc) lexer=sh;;
esac
;;
esac
fi
encoding=$(file --mime-encoding --uncompress $file_common_opts "$file")
if [[ $encoding == "us-asciibinarybinary" ]]; then
encoding="us-ascii"
fi
if [[ -n "$lexer" ]]; then
concat=cat
case $(file $file_common_opts --mime-type "$file") in
application/x-gzip) concat=zcat;;
application/x-bzip2) concat=bzcat;;
application/x-xz) concat=xzcat;;
esac
exec $concat "$file" | pygmentize -O inencoding=$encoding $PYGMENTIZE_OPTS $options -l $lexer
fi
exit 1
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