Formerly, bug-reference-fontify placed the overlay on the complete
match of bug-reference-bug-regexp. That made it impossible to encode
constraints like "must not match at BOL" in the regexp without messing
up fontification. Therefore, now it establishes the contract that
subexpression 1 defines the overlay region. Subexpression 2 must
still match the part of the bug reference injected into
bug-reference-url-format if that's a string. If its a function, the
interpretation of subexpressions > 1 is up to the function.
For backwards compatibility, bug-reference-fontify checks if the
bounds of subexpression 2..10 are within the bounds of subexpession
1. If not, or subexpression 1 doesn't even exist/match, we fall back
to placing the overlay from (match-beginning 0) to (match-end 0) but
issue a warning.
* lisp/progmodes/bug-reference.el (bug-reference-bug-regexp): Document
contract that subexpression 1 defines the overlay region and adapt the
default value accordingly.
(bug-reference--nonconforming-regexps): New internal variable.
(bug-reference--overlay-bounds): New function.
(bug-reference-fontify): Place overlay on subexpression 1's bounds if
bug-reference-bug-regexp conforms to the documented contract.
(bug-reference--setup-from-vc-alist): Adapt regexps to new contract.
* doc/emacs/maintaining.texi (Bug Reference): Adapt regexp used in
example.
This directory contains source code for the parts of Emacs that are
written in Emacs Lisp. *.el files are Emacs Lisp source, and the
corresponding *.elc files are byte-compiled versions. Byte-compiled
files are architecture-independent.
The term subdirectory contains Lisp files that customize Emacs for
certain terminal types. When Emacs starts, it checks the TERM
environment variable to get the terminal type and loads
'term/${TERM}.el' if it exists.
The other subdirectories hold Lisp packages grouped by their general
purpose.
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