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The first mistake here was to forget to wrap console codes with \[…\];
for some reason though after adding those…
export PS4=$(echo -en '\[\e[7m\]+ \[\e[0m\]')
… bash no longer repeats the first character (+) according to the
indirection level, or rather, it repeats an entirely unrelated
character:
$ ( PS4='+ ' ; set -x ; echo $(echo $(echo hi | grep hi)) )
+++ echo hi
+++ grep --color=auto hi
++ echo hi
+ echo hi
hi
$ ( PS4=$(echo -en '\[\e[7m\]+ \[\e[0m\]')
set -x
echo $(echo $(echo hi | grep hi))
) |& hexdump -C
00000000 01 01 01 1b 5b 37 6d 02 2b 20 01 1b 5b 30 6d 02 |....[7m.+ ..[0m.|
^^ ^^ ^^ (echo)
00000010 65 63 68 6f 20 68 69 0a 01 01 01 1b 5b 37 6d 02 |echo hi.....[7m.|
^^ ^^ ^^ (grep)
00000020 2b 20 01 1b 5b 30 6d 02 67 72 65 70 20 2d 2d 63 |+ ..[0m.grep --c|
00000030 6f 6c 6f 72 3d 61 75 74 6f 20 68 69 0a 01 01 1b |olor=auto hi....|
^^ ^^ (echo)
00000040 5b 37 6d 02 2b 20 01 1b 5b 30 6d 02 65 63 68 6f |[7m.+ ..[0m.echo|
00000050 20 68 69 0a 01 1b 5b 37 6d 02 2b 20 01 1b 5b 30 | hi...[7m.+ ..[0|
^^ (echo)
00000060 6d 02 65 63 68 6f 20 68 69 0a 68 69 0a |m.echo hi.hi.|
0000006d
No idea where those ^A characters come from.
While at it, wrap PS2 to avoid line-wrapping shenanigans.
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* inputrc goodies,
* let readline see C-s,
* reverse PS4 for kicks,
* protect crippled shells (M-x shell, batch ssh commands) from this
savagery.
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TTYs seem to have a glyph for that one.
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Because I'm a Unicode hipster.
Also move the "dumb" check below function definitions, so that maybe
someday I can try to play with those functions in shell-mode.
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Otherwise Emacs picks it up when started from a terminal, defeating my
attempt to shield M-x shell from my weird-ass prompt.
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I've seen the prohibited sign elsewhere before (on Github IIRC),
I find it neat.
Using the box drawing rather than the long dash ensures the line looks
continuous even in TTYs.
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Simplifies the code somewhat; less arguments to pass around.
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- no newline: simply append a visible /
- error code: move to first line and make rule red
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User/host/working-directory/Git status go on the first line; the
"prompt" line only contains the prompt symbol and the previous
command's error code.
Also fill the rest of the line when a command does not end with
a newline.
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- remove speculative parentheses
- sort table by code
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To reproduce the issue:
$ echo -e '\E[?7l'
(cf. console_codes(4))
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TRAMP fails to connect to remote hosts that set this prompt.
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bash(1) already mentions _profile, _login, _logout and _history.
.bashrc adds .bash_aliases (although .bashrc itself is an exception).
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