Greetings, fellow tilers of windows!
I've written a little patch for a friend, that enables the use of ^ after
a number in a format expansion string (such as *SCREEN-MODE-LINE-FORMAT*
or *WINDOW-FORMAT*) to trim from the left, instead of the right.
I picked the #\^ character because it's fairly standard for an
end-of-string anchor, because of its use in perl-compatible regex. I
considered using one of the FORMAT modify characters, but since format
expansion strings aren't format strings, I ended up settling with this.
Thoughts? Comments? Cookies? Flames? Patch attached.
The patch was made against commit 95c420e6214908d96e08eeed27bb7a1ee0d103bf
from the official git repo. I've made a commit in my local repo, so I
could push this myself if that's more convenient.
Happy Hacking,
Adlai
From 7e833c6aa927d9cb4222c215aa0369b2cbfbf4e8 Mon Sep 17 00:00:00 2001
From: Adlai Chandrasekhar <munchk...@gmail.com>
Date: Sat, 24 Oct 2009 09:07:13 +0200
Subject: [PATCH] Added left trim option for format-expand strings
---
primitives.lisp | 15 ++++++++++-----
1 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/primitives.lisp b/primitives.lisp
index 4fd7e41..b0f9224 100644
--- a/primitives.lisp
+++ b/primitives.lisp
@@ -706,9 +706,11 @@ do:
(setf cur (cdr cur))
(let* ((tmp (loop while (and cur (char<= #\0 (car cur) #\9))
collect (pop cur)))
- (len (and tmp (parse-integer (coerce tmp 'string)))))
+ (len (and tmp (parse-integer (coerce tmp 'string))))
+ ;; So that eg "%25^t" will trim from the left
+ (from-left-p (when (char= #\^ (car cur)) (pop cur))))
(if (null cur)
- (format t "%~a" len)
+ (format t "%...@[~a~]" len from-end-p)
(let* ((fmt (cadr (assoc (car cur) fmt-alist :test 'char=)))
(str (cond (fmt
;; it can return any type, not jut as
string.
@@ -718,9 +720,12 @@ do:
(t
(concatenate 'string (string #\%) (string
(car cur)))))))
;; crop string if needed
- (setf output (concatenate 'string output (if len
- (subseq str 0
(min len (length str)))
- str)))
+ (setf output (concatenate 'string output
+ (cond ((null len) str)
+ ((not from-left-p) ;
Default behavior
+ (subseq str 0 (min len
(length str))))
+ ;; New behavior -- trim
from the left
+ (t (subseq str (max 0 (-
(length str) len)))))))
(setf cur (cdr cur))))))
(t
(setf output (concatenate 'string output (string (car cur)))
--
1.6.5.1
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