bug#27405: 25.2; Make eshell-next-prompt more reliable

[npostavs]

tags 27405 + patch
quit

Pierre Neidhardt <ambrevar@gmail.com> writes:

>>
>> Hmm, maybe beginning-of-line would make more sense?  If I have point on
>> the same line of the prompt I can get to the beginning of the prompted
>> line with C-a, so C-c C-p probably means I want to go farther back.
>
> Agreed. Please make the change and add a comment.

I think also that doing the text property check following the regexp
search doesn't really make sense, one or the other should be used, not
both:

>From 1dd9644f1322d3b40ba98482d4aca0105db56d81 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Tue, 11 Jul 2017 22:11:19 -0400
Subject: [PATCH v2] Make eshell-next-prompt more reliable (Bug#27405)

* lisp/eshell/em-prompt.el (eshell-next-prompt): Search for
`eshell-prompt-regexp' (and `read-only' text-property if
`eshell-highlight-prompt' is set) rather than trying to use
`forward-paragraph'.
(eshell-previous-prompt): Don't count prompt on current line.
---
 lisp/eshell/em-prompt.el | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/lisp/eshell/em-prompt.el b/lisp/eshell/em-prompt.el
index 8c81b43b1f..2fd1db2113 100644
--- a/lisp/eshell/em-prompt.el
+++ b/lisp/eshell/em-prompt.el
@@ -161,14 +161,25 @@ (defun eshell-next-prompt (n)
   "Move to end of Nth next prompt in the buffer.
 See `eshell-prompt-regexp'."
   (interactive "p")
-  (forward-paragraph n)
+  (if eshell-highlight-prompt
+      (progn
+        (while (< n 0)
+          (while (and (re-search-backward eshell-prompt-regexp nil t)
+                      (not (get-text-property (match-beginning 0) 
'read-only))))
+          (setq n (1+ n)))
+        (while (> n 0)
+          (while (and (re-search-forward eshell-prompt-regexp nil t)
+                      (not (get-text-property (match-beginning 0) 
'read-only))))
+          (setq n (1- n))))
+    (re-search-forward eshell-prompt-regexp nil t n))
   (eshell-skip-prompt))
 
 (defun eshell-previous-prompt (n)
   "Move to end of Nth previous prompt in the buffer.
 See `eshell-prompt-regexp'."
   (interactive "p")
-  (eshell-next-prompt (- (1+ n))))
+  (beginning-of-line)            ; Don't count prompt on current line.
+  (eshell-next-prompt (- n)))
 
 (defun eshell-skip-prompt ()
   "Skip past the text matching regexp `eshell-prompt-regexp'.
-- 
2.11.1