/usr/share/diffuse/syntax/csh.syntax is in diffuse 0.4.8-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 | # C Shell syntax file for Diffuse
# Copyright (C) 2008-2009 Derrick Moser <derrick_moser@yahoo.com>
syntax 'C Shell' normal text
syntax_files 'C Shell' '^(.*\.csh|\.t?cshrc)$'
syntax_magic 'C Shell' '^#![ \t]*([^ \t/]*/)*(env[ \t]+)?(t?csh)[0-9\.]*([ \t].*)?$'
# colours
colour csh_comment 0.2 0.4 0.64
colour csh_fixme 1.0 0.5 0.0
colour csh_literal 1.0 0.2 0.8
colour csh_string 0.8 0.0 0.0
colour csh_subshell 0.46 0.31 0.48
colour csh_escapedchar 0.46 0.31 0.48
colour csh_variable 0.02 0.6 0.6
colour csh_keyword 0.77 0.63 0.0
colour csh_punctuation 0.5 0.5 0.5
# whitespace
syntax_pattern normal normal text '[ \t\r\n]+'
# keywords
syntax_pattern normal expr csh_keyword '\b(alias|alloc|bg|bindkey|break|breaksw|bs2cmd|builtins|bye|case|cd|chdir|complete|continue|default|dirs|echo|echotc|else([ \t]if)?|end|endif|endsw|eval|exec|exit|fg|filetest|foreach|getspath|getxvers|glob|goto|hashstat|history|hup|if|inlib|jobs|kill|limit|log|login|logout|ls-F|migrate|newgrp|nice|nohup|notify|onintr|popd|printenv|pushd|rehash|repeat|rootnode|sched|set|setenv|setpath|setspath|settc|setty|setxvers|shift|source|stop|suspend|switch|telltc|termname|then|time|umask|unalias|uncomplete|unhash|universe|unlimit|unset|unsetenv|ver|wait|warp|watchlog|where)\b'
syntax_pattern normal expr text ''
# whitespace/comments
syntax_pattern expr normal text '(\r\n|\r|\n)$'
syntax_pattern expr comment csh_comment '#'
syntax_pattern comment normal csh_comment '(\r\n|\r|\n)$'
syntax_pattern comment comment csh_fixme '\b(TODO|FIXME|XXX)\b'
syntax_pattern comment comment csh_comment '.[^TFX\r\n]*'
# punctuation
syntax_pattern expr normal csh_punctuation '[\|&;\(\)!]+'
syntax_pattern expr expr csh_punctuation '[<>=~\+\-\*/%]+'
# escaped character
syntax_pattern expr expr csh_escapedchar '(\\(\r?\n|.))+'
# environment variables
syntax_pattern expr expr csh_variable '\$([\?#%]?[a-z_0-9]+|\{[\?#%]?[a-z_0-9]+\}|[\*#\?\$!<])' ignorecase
# '-style strings
syntax_pattern expr single_string csh_string "'"
syntax_pattern single_string expr csh_string "'"
syntax_pattern single_string single_string csh_string "[^']+"
# "-style strings
syntax_pattern expr double_string csh_string '"'
syntax_pattern double_string expr csh_string '"'
syntax_pattern double_string double_subshell_string csh_subshell '`'
syntax_pattern double_string double_string csh_variable '\$([\?#%]?[a-z_0-9]+|\{[\?#%]?[a-z_0-9]+\}|[\*#\?\$!<])' ignorecase
syntax_pattern double_string double_string csh_escapedchar '(\\(\r?\n|.))+'
syntax_pattern double_string double_string csh_string '.[^\\"\$`]*'
# subshell within "-style strings
syntax_pattern double_subshell_string double_string csh_subshell '`'
syntax_pattern double_subshell_string double_subshell_string csh_escapedchar '(\\.)+'
syntax_pattern double_subshell_string double_subshell_string csh_variable '\$([\*#\?\$!<]|[\?#%]?[a-z_0-9]+|\{[\?#%]?[a-z_0-9]+\})' ignorecase
syntax_pattern double_subshell_string double_subshell_string csh_subshell '.[^\\`\$]*'
# subshell
syntax_pattern expr subshell_string csh_subshell '`'
syntax_pattern subshell_string expr csh_subshell '`'
syntax_pattern subshell_string subshell_string csh_variable '\$([\?#%]?[a-z_0-9]+|\{[\?#%]?[a-z_0-9]+\}|[\*#\?\$!<])' ignorecase
syntax_pattern subshell_string subshell_string csh_escapedchar '(\\(\r?\n|.))+'
syntax_pattern subshell_string subshell_string csh_subshell '.[^\\`\$]*'
# literal
syntax_pattern expr expr csh_literal '\b[0-9]+\b'
# parsing optimisation
syntax_pattern expr expr text '[a-z0-9_]+' ignorecase
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