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authorCase Duckworth2023-01-09 00:11:37 -0600
committerCase Duckworth2023-01-09 00:11:37 -0600
commitc31167e9ccc52fbd4ce0abae13196feb5d18da02 (patch)
tree99a661ca7312a858730aa94adda1716d89af697f /plugins
parentAdd installation instructions (diff)
downloadvienna-c31167e9ccc52fbd4ce0abae13196feb5d18da02.tar.gz
vienna-c31167e9ccc52fbd4ce0abae13196feb5d18da02.zip
Add plugins/minimize.sh
Diffstat (limited to 'plugins')
-rw-r--r--plugins/minimize.sh45
1 files changed, 45 insertions, 0 deletions
diff --git a/plugins/minimize.sh b/plugins/minimize.sh new file mode 100644 index 0000000..f7eec1b --- /dev/null +++ b/plugins/minimize.sh
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1# minimize.sh --- Minimize CSS/JS assets using sed
2
3# from https://www.tero.co.uk/scripts/minify.php
4
5### Commentary:
6
7## How it works
8# It removes comments from CSS and Javascript files using sed. First it replaces
9# /**/ and /*\*/ with /~~/ and /~\~/ as these comments are used as CSS hacks and
10# should stay in the file. Then it removes /*...*/ style comments on single
11# lines (from Javascript and CSS files - this was adapted from a common PHP
12# regular expression for removing CSS comments). Then it removes // style
13# comments from Javascript files (unless they are preceded by a : which means
14# they might be web links). (It's done in this order so that comments like
15# /*...//...*/ get removed properly). Then it replaces all newlines with spaces
16# and removes /*...*/ style comments again (this time over multiple lines). Then
17# it puts the /**/ and /*\*/ CSS hacks back in. Then it replaces multiple spaces
18# with single spaces. Then it removes spaces before [{;:,] and then spaces after
19# [{:;,].
20
21## Problems - quotes and Ajaxy functions
22# This script does not ignore things in quotes. So if you have a comment
23# inside a quote in a Javascript file, such as document.writeln ('//This
24# is a comment');, the script will remove everything from the // and
25# cause a Javascript error. Also, all lines of Javascript must end with
26# a semicolon. This can be an issue with libraries which declare
27# functions on a line but don't end the line with a semicolon (as is
28# common in Ajax and JQuery scripts). For example, in: load : function
29# (url,callback,format) {...} http.send(nul);, there should be a
30# semicolon after the function definition. This is legal Javascript if
31# there's a line break, but causes an error once minimised without the
32# line break.
33
34## The Function
35minimize() { # minimize < INPUT
36 sed -e "s|/\*\(\\\\\)\?\*/|/~\1~/|g" \
37 -e "s|/\*[^*]*\*\+\([^/][^*]*\*\+\)*/||g" \
38 -e "s|\([^:/]\)//.*$|\1|" -e "s|^//.*$||" |
39 tr '\n' ' ' |
40 sed -e "s|/\*[^*]*\*\+\([^/][^*]*\*\+\)*/||g" \
41 -e "s|/\~\(\\\\\)\?\~/|/*\1*/|g" \
42 -e "s|\s\+| |g" \
43 -e "s| \([{;:,]\)|\1|g" \
44 -e "s|\([{;:,]\) |\1|g"
45}