[Bug gdb/26786] New: Gdb styles render garbage on terminal if it is not ANSI-like

[Bug gdb/26786] New: Gdb styles render garbage on terminal if it is not ANSI-like

[martin at NetBSD dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26786

            Bug ID: 26786
           Summary: Gdb styles render garbage on terminal if it is not
                    ANSI-like
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: martin at NetBSD dot org
  Target Milestone: ---

Gdb does the fancy visual styles - but it does not even try to check if the
$TERM in use does support the color changing escape sequences.

It is easy to disable the styles with:

set style enabled off

in ~/.gdbinit - but it should not be necessary, as the terminal capabilities
can should be checked before enabling them by default.

Worse: even if disabled, some messages still use the broken escape sequences
and render garbage on the screen:

00000000  5b 2f 74 6d 70 5d 20 6d  61 72 74 69 6e 40 6d 61  |[/tmp] martin@ma|
00000010  72 74 69 6e 73 20 3e 20  67 64 62 0d 0d 0a 1b 5b  |rtins > gdb....[|
00000020  33 35 3b 31 6d 1b 5b 33  35 3b 31 6d 47 4e 55 20  |35;1m.[35;1mGNU |
00000030  67 64 62 20 1b 5b 6d 1b  5b 33 35 3b 31 6d 28 47  |gdb .[m.[35;1m(G|
00000040  44 42 29 20 1b 5b 6d 1b  5b 33 35 3b 31 6d 31 31  |DB) .[m.[35;1m11|
00000050  2e 30 2e 35 30 2e 32 30  32 30 30 39 31 34 2d 67  |.0.50.20200914-g|
00000060  69 74 1b 5b 6d 1b 5b 33  35 3b 31 6d 0d 0a 1b 5b  |it.[m.[35;1m...[|
00000070  6d 1b 5b 6d 43 6f 70 79  72 69 67 68 74 20 28 43  |m.[mCopyright (C|

Another issue with the styles is that the defaults are unusable (or at least
very hard to read) on terminals with dark backgrounds, but I'm not sure that
would be easy to auto-detect.

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[Bug gdb/26786] Gdb styles render garbage on terminal if it is not ANSI-like

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26786

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-11-01
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
Confirmed.  Curious what terminal you use.

FWIW I use a dark background and the colors seem ok to me.
There was a bug in GNU source highlight where the function
names would be black, but this problem was fixed there.

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[Bug gdb/26786] Gdb styles render garbage on terminal if it is not ANSI-like

[martin at NetBSD dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26786

--- Comment #2 from Martin Husemann <martin at NetBSD dot org> ---
term type: usualy urxvt (where the ansi colors work), but sometimes (ancient)
sun consoles (where they don't).

The colors "work" but eg. in:

Breakpoint 1 at 0x4b0a: file test.c, line 48.

the 0x4b0a is printed in dark blue, which is (for me, maybe age + eyes +
whathaveyou) barely readable on black background.

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[Bug gdb/26786] Gdb styles render garbage on terminal if it is not ANSI-like

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26786

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
Figuring out if a terminal is ANSI-capable is surprisingly difficult.

Also maybe gdb ought to support NO_COLOR: https://no-color.org/

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