master f2aae8b879b: eshell-next-prompt: More precisely navigate to the prompt (bug#63748)

[Jim Porter]

branch: master
commit f2aae8b879baa4986b69af7ee54fe4eb987b99d6
Author: Tony Zorman <soliditsallgood@mailbox.org>
Commit: Jim Porter <jporterbugs@gmail.com>

    eshell-next-prompt: More precisely navigate to the prompt (bug#63748)
    
    * lisp/eshell/em-prompt.el (eshell-next-prompt): Navigate to the
    current prompt more accurately by using text properties instead of
    going to the beginning of the line.  This is important for multiline
    prompts, as they don't necessarily start at the beginning of the
    current line.
    
    * test/lisp/eshell/em-prompt-tests.el
    (em-prompt-test--with-multiline):
    Execute a given body with a multiline prompt.
    
    (em-prompt-test/next-previous-prompt-with):
    (em-prompt-test/forward-backward-matching-input-with):
    Helper functions for code reuse.
    
    (em-prompt-test/forward-backward-matching-input):
    (em-prompt-test/next-previous-prompt):
    Rewrite in terms of the appropriate helper functions.
    
    (em-prompt-test/next-previous-prompt-multiline):
    (em-prompt-test/forward-backward-matching-input-multiline):
    Add multiline variants of existing tests.
---
 lisp/eshell/em-prompt.el            |  3 ++-
 test/lisp/eshell/em-prompt-tests.el | 31 +++++++++++++++++++++++++++----
 2 files changed, 29 insertions(+), 5 deletions(-)

diff --git a/lisp/eshell/em-prompt.el b/lisp/eshell/em-prompt.el
index 9f9e58e83d7..42f8f273b52 100644
--- a/lisp/eshell/em-prompt.el
+++ b/lisp/eshell/em-prompt.el
@@ -180,7 +180,8 @@ negative, find the Nth next match."
                   (text-property-search-forward 'field 'prompt t))
         (setq n (1- n)))
     (let (match this-match)
-      (forward-line 0)           ; Don't count prompt on current line.
+      ;; Don't count the current prompt.
+      (text-property-search-backward 'field 'prompt t)
       (while (and (< n 0)
                   (setq this-match (text-property-search-backward
                                     'field 'prompt t)))
diff --git a/test/lisp/eshell/em-prompt-tests.el 
b/test/lisp/eshell/em-prompt-tests.el
index 257549e40fb..93bf9d84ab3 100644
--- a/test/lisp/eshell/em-prompt-tests.el
+++ b/test/lisp/eshell/em-prompt-tests.el
@@ -80,8 +80,13 @@ This tests the case when `eshell-highlight-prompt' is nil."
                 (apply #'propertize "hello\n"
                        eshell-command-output-properties)))))))
 
-(ert-deftest em-prompt-test/next-previous-prompt ()
-  "Check that navigating forward/backward through old prompts works correctly."
+(defmacro em-prompt-test--with-multiline (&rest body)
+  "Execute BODY with a multiline Eshell prompt."
+  `(let ((eshell-prompt-function (lambda () "multiline prompt\n$ ")))
+     ,@body))
+
+(defun em-prompt-test/next-previous-prompt-with ()
+  "Helper for checking forward/backward navigation of old prompts."
   (with-temp-eshell
    (eshell-insert-command "echo one")
    (eshell-insert-command "echo two")
@@ -98,8 +103,17 @@ This tests the case when `eshell-highlight-prompt' is nil."
    (eshell-next-prompt 3)
    (should (equal (eshell-get-old-input) "echo fou"))))
 
-(ert-deftest em-prompt-test/forward-backward-matching-input ()
-  "Check that navigating forward/backward via regexps works correctly."
+(ert-deftest em-prompt-test/next-previous-prompt ()
+  "Check that navigating forward/backward through old prompts works correctly."
+  (em-prompt-test/next-previous-prompt-with))
+
+(ert-deftest em-prompt-test/next-previous-prompt-multiline ()
+  "Check old prompt forward/backward navigation for multiline prompts."
+  (em-prompt-test--with-multiline
+   (em-prompt-test/next-previous-prompt-with)))
+
+(defun em-prompt-test/forward-backward-matching-input-with ()
+  "Helper for checking forward/backward navigation via regexps."
   (with-temp-eshell
    (eshell-insert-command "echo one")
    (eshell-insert-command "printnl something else")
@@ -117,4 +131,13 @@ This tests the case when `eshell-highlight-prompt' is nil."
    (eshell-forward-matching-input "echo" 3)
    (should (equal (eshell-get-old-input) "echo fou"))))
 
+(ert-deftest em-prompt-test/forward-backward-matching-input ()
+  "Check that navigating forward/backward via regexps works correctly."
+  (em-prompt-test/forward-backward-matching-input-with))
+
+(ert-deftest em-prompt-test/forward-backward-matching-input-multiline ()
+  "Check forward/backward regexp navigation for multiline prompts."
+  (em-prompt-test--with-multiline
+   (em-prompt-test/forward-backward-matching-input-with)))
+
 ;;; em-prompt-tests.el ends here