bug#17818: 24.3.91; sh-learn-buffer-indent doesn't learn current indent anymore

[Reiner Steib <Reiner.Steib@gmx.de>]

Hi,

in Emacs 24.3.91, `sh-learn-buffer-indent' doesn't seem to learn the
current indent rules of the buffer anymore.  It worked correctly in
23.3 and better in 24.1, see below.

(I use `sh-learn-buffer-indent' in `sh-set-shell-hook'.)

Consider this shell script:

###
$ cat shell-script-test.sh
#!/bin/sh

if true; do
  echo "My sh-basic-offset offset should be 2."
fi

for a in 1; do
  echo "My sh-basic-offset offset should be 2."
done
###

* In Emacs 23.3 (==> *expected behavior*):

- emacs -title emacs-23.3 shell-script-test.sh
- M-x sh-learn-buffer-indent RET
- C-x b *indent* RET

  Switching to buffer *indent* shows:

  Indentation values for buffer shell-script-test.sh.
  0 indentation variables have different values.

  Comments follow default indentation.

  Initial value of sh-basic-offset: 4
  Suggested sh-basic-offset:  2

  Learned variable settings:
    sh-indent-after-if 2
    sh-indent-for-fi 0
    sh-indent-after-loop-construct 2
    sh-indent-for-done 0
    sh-indent-comment t

- Put point after first "then", hit RET and TAB (or C-j)
- the new line is indented by 2 spaces (==> *expected behavior*)

- Put point after first "echo" line, hit RET and TAB (or C-j)
- the new line is indented by 2 spaces (==> *expected behavior*)

* Emacs 24.1:

- emacs -title emacs-24.1 -Q shell-script-test.sh
- M-x sh-learn-buffer-indent RET

Result:
  Message: Buffer is read-only: #<buffer *indent*>

  Buffer *indent* exists but it is empty.

Something is wrong, but indentation works as expected.

- Put point after first "then", hit RET and TAB (or C-j)
- the new line is indented by 2 spaces (==> *expected behavior*)

- Put point after first "echo" line, hit RET and TAB (or C-j)
- the new line is indented by 2 spaces (==> *expected behavior*)

* Emacs 24.3.91:

- emacs -title emacs-24.1 -Q shell-script-test.sh
- M-x sh-learn-buffer-indent RET

Message: Local rules set

- Put point after first "then", hit RET (or C-j and TAB) [1]
- the new line is indented by 4 spaces (==> *wrong behavior*)

- Put point after first "echo" line, hitRET (or C-j and TAB)
- the new line is indented by 4 spaces (==> *wrong behavior*)
  and the "echo" line is indented by 4 spaces (==> *wrong behavior*)

In GNU Emacs 24.3.91.1 (i686-pc-mingw32)
 of 2014-05-12 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1'

Important settings:
  value of $LANG: C.ISO-8859-1
  locale-coding-system: cp1252


Bye, Reiner.


[1] NEWS says:

*** `electric-indent-mode' is now enabled by default.
Typing RET reindents the current line and indents the new line.
`C-j' inserts a newline but does not indent.  In some programming modes,
additional characters are electric (eg `{').
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/