bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Ergus via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi:

Very recently I have built emacs on MS-Win...10 (please don't ask
 why). I used msys2 and followed this guide which seems to be very clear
 and simple:

https://gist.github.com/nauhygon/f3b44f51b34e89bc54f8

After the build and installation, everything seemed
correctly. runemacs.exe works as expected... and in gui it works fine (a
bit slow to start... but maybe that is not so important now)

However, when I tried:

emacs -nw -Q

I found that emacs was not clearing the terminal on startup. So, emacs
is apparently starting correctly (status-line is visible and cursos),
but the previous text is still on the screen overlapping with emacs and
making it unusable. If opening a file, the file content is inserted
bellow the old text, truncating the head of the file, but the cursor can
move up to the top.

Moving the cursor down (off the screen) the screen scrolls the file
content, but the old text stays fix.

After C-x C-c, emacs exists "correctly" but in this case the terminal is
actually cleared (Like C-l usually do). Which somehow is not intended,
because the terminal is expected to be recovered to it's previous
status right?

All this was with the current master and the emacs-29 branch.

(I report this from a different emacs, so ignore the rest of the
auto-inserted information)


In GNU Emacs 30.0.50 (build 7, x86_64-pc-linux-gnu, GTK+ Version
 3.24.36, cairo version 1.17.6) of 2023-01-05 built on Ergus
Repository revision: 15fc7b3cde92e420f48dfe188251e6af4d832af5
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --prefix=/home/ergo/.local/ --with-mailutils --with-json
 --with-x-toolkit=gtk3 --with-xft --with-modules --with-cairo
 --with-harfbuzz --with-native-compilation
 '--program-transform-name=s/^ctags$/ctags.emacs/''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LCMS2 LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER
PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  which-key-mode: t
  eldoc-mode: t
  show-paren-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
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  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
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Load-path shadows:
/mnt/casa/gits/emacs_clones/gtags-mode/gtags-mode hides /home/ergo/.config/emacs/elpa/gtags-mode-1.0/gtags-mode
/home/ergo/.config/emacs/elpa/transient-20230107.1528/transient hides /home/ergo/.local/share/emacs/30.0.50/lisp/transient

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bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Eli Zaretskii]

> Date: Fri, 20 Jan 2023 17:40:17 +0100
> From:  Ergus via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Very recently I have built emacs on MS-Win...10 (please don't ask
>  why). I used msys2 and followed this guide which seems to be very clear
>  and simple:
> 
> https://gist.github.com/nauhygon/f3b44f51b34e89bc54f8
> 
> After the build and installation, everything seemed
> correctly. runemacs.exe works as expected... and in gui it works fine (a
> bit slow to start... but maybe that is not so important now)
> 
> However, when I tried:
> 
> emacs -nw -Q
> 
> I found that emacs was not clearing the terminal on startup.

What is "the terminal" from which you invoke "emacs -nw"?  You should
invoke it from cmd.exe (a.k.a. "Command Prompt") window, not from the
MSYS2 mintty terminal.

> So, emacs is apparently starting correctly (status-line is visible
> and cursos), but the previous text is still on the screen
> overlapping with emacs and making it unusable. If opening a file,
> the file content is inserted bellow the old text, truncating the
> head of the file, but the cursor can move up to the top.
> 
> Moving the cursor down (off the screen) the screen scrolls the file
> content, but the old text stays fix.
> 
> After C-x C-c, emacs exists "correctly" but in this case the terminal is
> actually cleared (Like C-l usually do). Which somehow is not intended,
> because the terminal is expected to be recovered to it's previous
> status right?
> 
> All this was with the current master and the emacs-29 branch.

Emacs isn't that badly broken on Windows, including in -nw sessions.
You should invoke it as a native Windows application, from the Command
Prompt window, not as an MSYS2 application.

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Ergus via Bug reports for GNU Emacs, the Swiss army knife of text editors]

[-- Attachment #1: Type: text/plain, Size: 2631 bytes --]

 Hi Eli:

Thanks, now I understand the problem... it is a bit weird, but OK.
Today I also tried the nt/INSTALL.64 steps and somehow I got an issue about #include <ms-w32.h>: No such file or directory.
I repeated the steps in the guide carefully but I only get the same error after make.
---------------------------------
In file included from ../src/config.h 3043
../../source/lib/../src/conf_post.h:38:11: fatal error: ms-w32.h: No such file or directory   38 | # include <ms-w32.h>        |compilation terminated
----------------------------------
Any idea? I am using the mingw64 terminal to build as the guide says... so maybe there is anything wrong in my envirnment?
Thanks in advance,Ergus


    On Friday, January 20, 2023 at 08:17:23 PM GMT+1, Eli Zaretskii <eliz@gnu.org> wrote:  
 
 > Date: Fri, 20 Jan 2023 17:40:17 +0100
> From:  Ergus via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> Very recently I have built emacs on MS-Win...10 (please don't ask
>  why). I used msys2 and followed this guide which seems to be very clear
>  and simple:
> 
> https://gist.github.com/nauhygon/f3b44f51b34e89bc54f8
> 
> After the build and installation, everything seemed
> correctly. runemacs.exe works as expected... and in gui it works fine (a
> bit slow to start... but maybe that is not so important now)
> 
> However, when I tried:
> 
> emacs -nw -Q
> 
> I found that emacs was not clearing the terminal on startup.

What is "the terminal" from which you invoke "emacs -nw"?  You should
invoke it from cmd.exe (a.k.a. "Command Prompt") window, not from the
MSYS2 mintty terminal.

> So, emacs is apparently starting correctly (status-line is visible
> and cursos), but the previous text is still on the screen
> overlapping with emacs and making it unusable. If opening a file,
> the file content is inserted bellow the old text, truncating the
> head of the file, but the cursor can move up to the top.
> 
> Moving the cursor down (off the screen) the screen scrolls the file
> content, but the old text stays fix.
> 
> After C-x C-c, emacs exists "correctly" but in this case the terminal is
> actually cleared (Like C-l usually do). Which somehow is not intended,
> because the terminal is expected to be recovered to it's previous
> status right?
> 
> All this was with the current master and the emacs-29 branch.

Emacs isn't that badly broken on Windows, including in -nw sessions.
You should invoke it as a native Windows application, from the Command
Prompt window, not as an MSYS2 application.
  

[-- Attachment #2: Type: text/html, Size: 5439 bytes --]

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Eli Zaretskii]

> Date: Mon, 23 Jan 2023 22:45:15 +0000 (UTC)
> From: Ergus <spacibba@aol.com>
> Cc: "60966@debbugs.gnu.org" <60966@debbugs.gnu.org>
> 
> Thanks, now I understand the problem... it is a bit weird, but OK.

Please tell what you understood and what you think is weird.  I'd like
to make sure there's no misunderstanding here.

> Today I also tried the nt/INSTALL.64 steps and somehow I got an issue about #include <ms-w32.h>: No
> such file or directory.
> 
> I repeated the steps in the guide carefully but I only get the same error after make.
> 
> ---------------------------------
> 
> In file included from ../src/config.h 3043
> 
> ../../source/lib/../src/conf_post.h:38:11: fatal error: ms-w32.h: No such file or directory
>    38 | # include <ms-w32.h>
>         |
> compilation terminated

Please show the full compilation command, it sounds like some compiler
switches might be missing.  You can request display of full commands
during the build if you say

   make V=1

The configure script arranges for MinGW builds to add the -I../nt/inc
option to the compilation command line, which is where the ms-w32.h
header lives.

> Any idea? I am using the mingw64 terminal to build as the guide says... so maybe there is anything wrong in
> my envirnment?

If the above doesn't help, tell me how you configured the build: which
configure command you used and in whether your build is in the source
directory or outside of it.  Also, if you previously did another build
in the same tree, you need to clean the tree ("make extraclean").

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Ergus via Bug reports for GNU Emacs, the Swiss army knife of text editors]

On Tue, Jan 24, 2023 at 03:16:46PM +0200, Eli Zaretskii wrote:
>> Date: Mon, 23 Jan 2023 22:45:15 +0000 (UTC)
>> From: Ergus <spacibba@aol.com>
>> Cc: "60966@debbugs.gnu.org" <60966@debbugs.gnu.org>
>>
>> Thanks, now I understand the problem... it is a bit weird, but OK.
>
>Please tell what you understood and what you think is weird.  I'd like
>to make sure there's no misunderstanding here.
>
Hi Eli:

It is just a bit weird that emacs shouldn't be called from within the
msys terminal, maybe a warning message or something may help here. It is
not terrible, just a bit confusing.

>> Today I also tried the nt/INSTALL.64 steps and somehow I got an issue about #include <ms-w32.h>: No
>> such file or directory.
>>
>> I repeated the steps in the guide carefully but I only get the same error after make.
>>
>> ---------------------------------
>>
>> In file included from ../src/config.h 3043
>>
>> ../../source/lib/../src/conf_post.h:38:11: fatal error: ms-w32.h: No such file or directory
>>    38 | # include <ms-w32.h>
>>         |
>> compilation terminated
>
>Please show the full compilation command, it sounds like some compiler
>switches might be missing.  You can request display of full commands
>during the build if you say
>
>   make V=1
>
>The configure script arranges for MinGW builds to add the -I../nt/inc
>option to the compilation command line, which is where the ms-w32.h
>header lives.

I tried this and I see that the -I line is added correctly, but the
directory where I am building is inside 'Documents and Settings' which
has spaces and I don't see any quote or \ escape.

gcc -c -mtune=generic -DUSE_CRT_DLL=1 -I /c/Documents and
Settings/T008593/Downloads/emacs/build/../source/nt/inc -mtune=generic
-MMD -MF deps/fingerprint.d -MP -g3 -O2 -gdwarf-2 -I. -I../src
-I../../source/lib -I../../source/lib/../src -DGL_COMPILE_CRYPTO_STREAM
-o fingerprint.o ../../source/lib/fingerprint.c

So, probably is this the problem??

>> Any idea? I am using the mingw64 terminal to build as the guide says... so maybe there is anything wrong in
>> my envirnment?
>
>If the above doesn't help, tell me how you configured the build: which
>configure command you used and in whether your build is in the source
>directory or outside of it.  Also, if you previously did another build
>in the same tree, you need to clean the tree ("make extraclean").

Just to mention, the build is outside of sources. I made all the clean
as usual like on GNU/Linux.

Thanks,
Ergus

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Eli Zaretskii]

> Date: Tue, 24 Jan 2023 16:24:29 +0100
> From: Ergus <spacibba@aol.com>
> Cc: 60966@debbugs.gnu.org
> 
> It is just a bit weird that emacs shouldn't be called from within the
> msys terminal, maybe a warning message or something may help here. It is
> not terrible, just a bit confusing.

Maybe you should ask mintty developers to look into this?  No one
never asked Emacs to support mintty on Windows.  But then almost no
one uses the -nw sessions on Windows (why would you want to?).

> gcc -c -mtune=generic -DUSE_CRT_DLL=1 -I /c/Documents and
> Settings/T008593/Downloads/emacs/build/../source/nt/inc -mtune=generic
> -MMD -MF deps/fingerprint.d -MP -g3 -O2 -gdwarf-2 -I. -I../src
> -I../../source/lib -I../../source/lib/../src -DGL_COMPILE_CRYPTO_STREAM
> -o fingerprint.o ../../source/lib/fingerprint.c
> 
> So, probably is this the problem??

Yes.  Feel free to suggest a patch for configure.ac that would quote
the names.  Better yet, don't build Emacs inside directories with
whitespace in their names ;-)

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Ergus via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi Eli:

1)

I think you can close this issue or just add a comment about it
somewhere in the documentation...

So, it is done from my side. (If I get some time I will try to fix the
build system script, but not now)

2)

I have another issue because rgrep + MS-Windows does not work for me, I
try to use it like usual, but I get this:

----------------------------------------

-*- mode: grep; default-directory: "e:/Repository/" -*-
Grep started at Tue Jan 31 17:25:49

find -H . -type d "(" -path "*/SCCS" -o -path "*/RCS" -o -path "*/CVS"
-o -path "*/MCVS" -o -path "*/.src" -o -path "*/.svn" -o -path "*/.git"
-o -path "*/.hg" -o -path "*/.bzr" -o -path "*/_MTN" -o -path "*/_darcs"
-o -path "*/{arch}" ")" -prune -o ^"^!^" -type d "(" -name ".#*" -o
-name "*.o" -o -name "*~" -o -name "*.bin" -o -name "*.bak" -o -name
"*.obj" -o -name "*.map" -o -name "*.ico" -o -name "*.pif" -o -name
"*.lnk" -o -name "*.a" -o -name "*.ln" -o -name "*.blg" -o -name "*.bbl"
-o -name "*.dll" -o -name "*.drv" -o -name "*.vxd" -o -name "*.386" -o
-name "*.elc" -o -name "*.lof" -o -name "*.glo" -o -name "*.idx" -o
-name "*.lot" -o -name "*.fmt" -o -name "*.tfm" -o -name "*.class" -o
-name "*.fas" -o -name "*.lib" -o -name "*.mem" -o -name "*.x86f" -o
-name "*.sparcf" -o -name "*.dfsl" -o -name "*.pfsl" -o -name "*.d64fsl"
-o -name "*.p64fsl" -o -name "*.lx64fsl" -o -name "*.lx32fsl" -o -name
"*.dx64fsl" -o -name "*.dx32fsl" -o -name "*.fx64fsl" -o -name
"*.fx32fsl" -o -name "*.sx64fsl" -o -name "*.sx32fsl" -o -name
"*.wx64fsl" -o -name "*.wx32fsl" -o -name "*.fasl" -o -name "*.ufsl" -o
-name "*.fsl" -o -name "*.dxl" -o -name "*.lo" -o -name "*.la" -o -name
"*.gmo" -o -name "*.mo" -o -name "*.toc" -o -name "*.aux" -o -name
"*.cp" -o -name "*.fn" -o -name "*.ky" -o -name "*.pg" -o -name "*.tp"
-o -name "*.vr" -o -name "*.cps" -o -name "*.fns" -o -name "*.kys" -o
-name "*.pgs" -o -name "*.tps" -o -name "*.vrs" -o -name "*.pyc" -o
-name "*.pyo" ")" -prune -o -type f "(" -iname "*" ")" -exec grep
--color=always -i -nH --null -e "protoc" "{}" ";"

FIND: Parameter format not correct

Grep exited abnormally with code 2 at Tue Jan 31 17:25:49

------------------------

I tried this simplified version of the command from the msys-mingw64
terminal and it actually does not work.

find -H . -type d "(" -path "*/.git" ")" -prune -o type -f "(" -iname "*" ")" -exec grep -e "protoc" "{}" ";"

Is this a known issue for you? Else, I can open a new issue if you
prefer.

3) Is it there a clean way I could migrate one emacs installation
(packages in the elpa directory) between machines? Because the machine I
am using now does not have access to internet from the terminal (the
system has some ldap proxy); so, emacs cannot access elpa/melpa or
github to download any package.

Is there some tool in emacs intended for this purpose?

Thanks in advance,
And sorry for the bother
Ergus



On Tue, Jan 24, 2023 at 06:57:54PM +0200, Eli Zaretskii wrote:
>> Date: Tue, 24 Jan 2023 16:24:29 +0100
>> From: Ergus <spacibba@aol.com>
>> Cc: 60966@debbugs.gnu.org
>>
>> It is just a bit weird that emacs shouldn't be called from within the
>> msys terminal, maybe a warning message or something may help here. It is
>> not terrible, just a bit confusing.
>
>Maybe you should ask mintty developers to look into this?  No one
>never asked Emacs to support mintty on Windows.  But then almost no
>one uses the -nw sessions on Windows (why would you want to?).
>
>> gcc -c -mtune=generic -DUSE_CRT_DLL=1 -I /c/Documents and
>> Settings/T008593/Downloads/emacs/build/../source/nt/inc -mtune=generic
>> -MMD -MF deps/fingerprint.d -MP -g3 -O2 -gdwarf-2 -I. -I../src
>> -I../../source/lib -I../../source/lib/../src -DGL_COMPILE_CRYPTO_STREAM
>> -o fingerprint.o ../../source/lib/fingerprint.c
>>
>> So, probably is this the problem??
>
>Yes.  Feel free to suggest a patch for configure.ac that would quote
>the names.  Better yet, don't build Emacs inside directories with
>whitespace in their names ;-)

bug#60966: 30.0.50; Emacs -nw on msys2 is not clearing the terminal

[Eli Zaretskii]

> Date: Tue, 31 Jan 2023 17:55:22 +0100
> From: Ergus <spacibba@aol.com>
> Cc: 60966@debbugs.gnu.org
> 
> I think you can close this issue or just add a comment about it
> somewhere in the documentation...
> 
> So, it is done from my side. (If I get some time I will try to fix the
> build system script, but not now)

OK, closing.

> I have another issue because rgrep + MS-Windows does not work for me, I
> try to use it like usual, but I get this:
> 
> ----------------------------------------
> 
> -*- mode: grep; default-directory: "e:/Repository/" -*-
> Grep started at Tue Jan 31 17:25:49
> 
> find -H . -type d "(" -path "*/SCCS" -o -path "*/RCS" -o -path "*/CVS"
> -o -path "*/MCVS" -o -path "*/.src" -o -path "*/.svn" -o -path "*/.git"
> -o -path "*/.hg" -o -path "*/.bzr" -o -path "*/_MTN" -o -path "*/_darcs"
> -o -path "*/{arch}" ")" -prune -o ^"^!^" -type d "(" -name ".#*" -o
> -name "*.o" -o -name "*~" -o -name "*.bin" -o -name "*.bak" -o -name
> "*.obj" -o -name "*.map" -o -name "*.ico" -o -name "*.pif" -o -name
> "*.lnk" -o -name "*.a" -o -name "*.ln" -o -name "*.blg" -o -name "*.bbl"
> -o -name "*.dll" -o -name "*.drv" -o -name "*.vxd" -o -name "*.386" -o
> -name "*.elc" -o -name "*.lof" -o -name "*.glo" -o -name "*.idx" -o
> -name "*.lot" -o -name "*.fmt" -o -name "*.tfm" -o -name "*.class" -o
> -name "*.fas" -o -name "*.lib" -o -name "*.mem" -o -name "*.x86f" -o
> -name "*.sparcf" -o -name "*.dfsl" -o -name "*.pfsl" -o -name "*.d64fsl"
> -o -name "*.p64fsl" -o -name "*.lx64fsl" -o -name "*.lx32fsl" -o -name
> "*.dx64fsl" -o -name "*.dx32fsl" -o -name "*.fx64fsl" -o -name
> "*.fx32fsl" -o -name "*.sx64fsl" -o -name "*.sx32fsl" -o -name
> "*.wx64fsl" -o -name "*.wx32fsl" -o -name "*.fasl" -o -name "*.ufsl" -o
> -name "*.fsl" -o -name "*.dxl" -o -name "*.lo" -o -name "*.la" -o -name
> "*.gmo" -o -name "*.mo" -o -name "*.toc" -o -name "*.aux" -o -name
> "*.cp" -o -name "*.fn" -o -name "*.ky" -o -name "*.pg" -o -name "*.tp"
> -o -name "*.vr" -o -name "*.cps" -o -name "*.fns" -o -name "*.kys" -o
> -name "*.pgs" -o -name "*.tps" -o -name "*.vrs" -o -name "*.pyc" -o
> -name "*.pyo" ")" -prune -o -type f "(" -iname "*" ")" -exec grep
> --color=always -i -nH --null -e "protoc" "{}" ";"
> 
> FIND: Parameter format not correct

This is find.exe which comes with Windows, and is an entirely
different program.  You need to tweak your PATH so that the ported GNU
find.exe from MinGW64 is found before the Windows one.

> 3) Is it there a clean way I could migrate one emacs installation
> (packages in the elpa directory) between machines? Because the machine I
> am using now does not have access to internet from the terminal (the
> system has some ldap proxy); so, emacs cannot access elpa/melpa or
> github to download any package.

Just prepare an archive and then unpack it on the other machine.  It
should work.