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Weird occasional anomaly when saving files in shell mode (self.emacs)

submitted ago by onyxrev

I've been trying to track down the origin of this problem. Not sure if it's something in my .emacs, but every now and then when I exit a file from emacs the string "B1;2c" will be prepended at the beginning. I won't notice until something tries to parse it and fails miserably. It's getting really bad and I can't figure out what might be causing it.

Have you guys ever seen that or have any idea what might cause it??

Doesn't seem to happen when I run it in a GUI - only when run straight from a shell. None of my Google Fu has returned anything useful.

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[–]tashbarg 2 points3 points ago

Stuff prepended to files at saving sounds like unicode byte order mark, but what you wrote (B1;2c) isn't one. Very strange.

Since the behavior is dependent on GUI or not GUI, I would check the environment variables of both. Perhaps the shell variant has a different LANG, LC* or something.

It's just a wild guess, but perhaps it helps. Compare the content of process-environment when started from GUI to that when started from shell. (C-h v process-environment).

[–]onyxrev[S] 0 points1 point ago

Good idea. It happens both on my BSD and Linux machines.

[–]onyxrev[S] 0 points1 point ago

The terminal/shell varient has a LANG defined (LANG=en_CA.UTF-8) while Carbon Emacs doesn't. That's one of the only differences besides the garbage RVM throws in there for my Ruby work (ugh).

[–]michaelhoffman 2 points3 points ago*

It took me a moment to realize that by "shell mode" you mean running Emacs within a terminal, rather than the Emacs shell-mode.

This happens on both your Linux and BSD machines? Are you using them from the console or logging in remotely?

[–]onyxrev[S] 0 points1 point ago

ahhh - sorry about that. This is via SSH from bash.

[–]michaelhoffman 0 points1 point ago

What is the client computer and what terminal software are you using there? That probably has a lot more to do with this than Emacs.

[–]onyxrev[S] 0 points1 point ago

OSX Lion's stock Terminal 2.2.2

[–]tashbarg 0 points1 point ago

wadcann's comment seems to be spot on. Try to set another terminal emulation mode for Terminal or try another emulator (iTerm, xterm through X11).

[–]onyxrev[S] 0 points1 point ago

Good idea. I have no particular love for OSX's stock Terminal.

[–]greenrd 1 point2 points ago

What do you mean by "exit a file"?

[–]onyxrev[S] 0 points1 point ago

More specifically it seems to happen most when I C-x C out of emacs.

[–]onyxrev[S] 0 points1 point ago

Actually it can't be my .emacs because my most recent experience with it was on a new deployment of FreeBSD where I hadn't uploaded my emacs goodies yet.

[–]wadcann 1 point2 points ago

Well, the last part looks a bit similar to the tail end of an escape code for a terminal key sequence.

Xterm seems to send "<ESC>[1;2C" when I hit shift-right-arrow.

I'm not sure where the "B" comes from, though.

[–]onyxrev[S] 0 points1 point ago

I noticed that too. I will try a different terminal program and see if it still happens.

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