Homepage: git@github:emacsmirror/emacswiki.org.git
Author: Ricardo E. Gonzalez
Updated:
Tie code editing commands for GNU Emacs
To enter tie-mode automatically, add (autoload 'tie-mode "tie-mode")
to your .emacs file and add something like,
(setq auto-mode-alist (append (list (cons "\\.tie\\'" 'tie-mode))
auto-mode-alist))
to your .emacs file; otherwise the .pl suffix defaults to prolog-mode.
This code is based on the 20.7 version perl-mode.el, with extensive
rewriting.
The rest of the commentary was in the original perl-mode.el
I added a new feature which adds functionality to TAB; it is controlled
by the variable tie-tab-to-comment. With it enabled, TAB does the
first thing it can from the following list: change the indentation;
move past leading white space; delete an empty comment; reindent a
comment; move to end of line; create an empty comment; tell you that
the line ends in a quoted string, or has a # which should be a \#.
If your machine is slow, you may want to remove some of the bindings
to electric-tie-terminator. I changed the indenting defaults to be
what Larry Wall uses in tie/lib, but left in all the options.
I also tuned a few things: comments and labels starting in column
zero are left there by indent-tie-exp; tie-beginning-of-function
goes back to the first open brace/paren in column zero, the open brace
in 'sub ... {', or the equal sign in 'format ... ='; indent-tie-exp
(meta-^q) indents from the current line through the close of the next
brace/paren, so you don't need to start exactly at a brace or paren.
It may be good style to put a set of redundant braces around your
main program. This will let you reindent it with meta-^q.
Known problems (these are all caused by limitations in the Emacs Lisp
parsing routine (parse-partial-sexp), which was not designed for such
a rich language; writing a more suitable parser would be a big job):
1) Regular expression delimiters do not act as quotes, so special
characters such as `'"#:;[](){} may need to be backslashed
in regular expressions and in both parts of s/// and tr///.
2) The globbing syntax is not recognized, so special
characters in the pattern string must be backslashed.
3) The q, qq, and << quoting operators are not recognized; see below.
4) \ (backslash) always quotes the next character, so '\' is
treated as the start of a string. Use "\\" as a work-around.
5) To make variables such a $' and $#array work, tie-mode treats
$ just like backslash, so '$' is the same as problem 5.
6) Unfortunately, treating $ like \ makes ${var} be treated as an
unmatched }. See below.
7) When ' (quote) is used as a package name separator, tie-mode
doesn't understand, and thinks it is seeing a quoted string.
Here are some ugly tricks to bypass some of these problems: the tie
expression /`/ (that's a back-tick) usually evaluates harmlessly,
but will trick tie-mode into starting a quoted string, which
can be ended with another /`/. Assuming you have no embedded
back-ticks, this can used to help solve problem 3:
/`/; $ugly = q?"'$?; /`/;
To solve problem 6, add a /{/; before each use of ${var}:
/{/; while (<${glob_me}>) ...
Problem 7 is even worse, but this 'fix' does work :-(
$DB'stop#'
[$DB'line#'
] =~ s/;9$//;