[Bug tui/28887] New: colored prompt length not calculated correctly

[Bug tui/28887] New: colored prompt length not calculated correctly

[seanga2 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

            Bug ID: 28887
           Summary: colored prompt length not calculated correctly
           Product: gdb
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: tui
          Assignee: unassigned at sourceware dot org
          Reporter: seanga2 at gmail dot com
  Target Milestone: ---

When using gdb with a colored prompt such as

set prompt \033[31mgdb$ \033[0m

the length of the prompt will include the non-visible escape codes. This can be
demonstrated by entering a long command:

gdb$ some long command

and then pressing UP and HOME (or C-P and C-A). The cursor will be placed on
the space after "long," instead of on the s in "some", as expected.
Additionally, if one presses DOWN (C-N), "some long" will remain at the
beginning of the command. Despite this, the cursor is "logically" at the
beginning of the command, which can be seen by editing the command and
inspecting the history.

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[Bug tui/28887] colored prompt length not calculated correctly

[seanga2 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

seanga2 at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |11.1

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[Bug tui/28887] colored prompt length not calculated correctly

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
You can use \1 and \2 to mark the start and end of invisible characters.  gdb
should perhaps support the \[\] brackets like bash.

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[Bug tui/28887] colored prompt length not calculated correctly

[seanga2 at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

--- Comment #2 from seanga2 at gmail dot com ---
Thanks!

Is this documented anywhere?

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[Bug tui/28887] colored prompt length not calculated correctly

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

Hannes Domani <ssbssa at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ssbssa at sourceware dot org

--- Comment #3 from Hannes Domani <ssbssa at sourceware dot org> ---
https://sourceware.org/gdb/onlinedocs/gdb/gdb_002eprompt.html says it supports
\[\], but \1\2 are not listed there.

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[Bug tui/28887] colored prompt length not calculated correctly

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> ---
That works with the python interface, but not with set prompt.

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[Bug tui/28887] colored prompt length not calculated correctly

[ssbssa at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

--- Comment #5 from Hannes Domani <ssbssa at sourceware dot org> ---
The prompt docu [1] points to the python prompt docu for the list of acceptable
escape sequences.

[1] https://sourceware.org/gdb/onlinedocs/gdb/Prompt.html

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[Bug tui/28887] colored prompt length not calculated correctly

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

--- Comment #6 from Andreas Schwab <schwab@linux-m68k.org> ---
So far the theory.

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[Bug tui/28887] colored prompt length not calculated correctly

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=28887

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |vries at gcc dot gnu.org

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
I've build gdb 11.1 (both with packaged readline (8.1) and system readline
(7.0) in case this matters) and I can't reproduce this.

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