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Re: [Nano-devel] nano bug #54928: a syntax file should be fully read onl

From: Devin Hussey
Subject: Re: [Nano-devel] nano bug #54928: a syntax file should be fully read only when the syntax gets actually used
Date: Thu, 15 Nov 2018 09:00:47 -0500

rcfile.c and color.c are your main points of entry.

 - color.c -> update_colors
 - rcfile.c -> grab_and_store
 - rcfile.c -> parse_rcfile
 - rcfile.c -> parse_colors

The main issue with this is that we parse the rcfiles before the file
is even opened, which makes things a little complicated.

1. parse_rcfile reads every rc file included.
2. grab_and_store will store the extension, magic, and header to the
static variable live_syntaxes, which will be linked into
3. parse_colors reads every color file and stores it as a string
(after regcomping and regfreeing it immediately simply to check
syntax) in syntaxtype
4. The file is opened.
5. update_colors will scan through the list of syntaxes, check if the
header/magic/extension matches (again by regcomping/regfreeing
immediately), then compile the matching regex.

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