Re: [PATCH v7] git-prompt: make colourization consistent

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On 07/06/2022 18:22, Junio C Hamano wrote:
Joakim Petersen <joak-pet@xxxxxxxxx> writes:

The short upstream state indicator inherits the colour of the last short
state indicator before it (if there is one), and the sparsity state
indicator inherits this colour as well. This behaviour was introduced by
0ec7c23cdc6 (git-prompt: make upstream state indicator location
consistent, 2022-02-27), while before this change the aforementioned
indicators were white/the default text colour. Some examples to
illustrate this behaviour (assuming all indicators are enabled and
colourization is on):
  * If there is something in the stash, both the '$' and the short
    upstream state indicator following it will be blue.
  * If the local tree has new, untracked files and there is nothing in
    the stash, both the '%' and the short upstream state indicator
    will be red.
  * If all local changes are added to the index and the stash is empty,
    both the '+' and the short upstream state indicator following it will
    be green.
  * If the local tree is clean and there is nothing in the stash, the
    short upstream state indicator will be white/${default text colour}.

This appears to be an unintended side-effect of the change, and makes
little sense semantically (e.g. why is it bad to be in sync with
upstream when you have uncommitted local changes?). The cause of the
change in colourization is that previously, the short upstream state
indicator appeared immediately after the rebase/revert/bisect/merge
state indicator (note the position of $p in $gitstring):

	local f="$h$w$i$s$u"
	local gitstring="$c$b${f:+$z$f}${sparse}$r$p"
	
Said indicator is prepended with the clear colour code, and the short
upstream state indicator is thus also uncoloured. Now, the short
upstream state indicator follows the sequence of colourized indicators,
without any clearing of colour (again note the position of $p, now in
$f):

	local f="$h$w$i$s$u$p"
	local gitstring="$c$b${f:+$z$f}${sparse}$r${upstream}"

If the user is in a sparse checkout, the sparsity state indicator
follows a similar pattern to the short upstream state indicator.
However, clearing colour of the colourized indicators changes how the
sparsity state indicator is colourized, as it currently inherits (and
before the change referenced also inherited) the colour of the last
short state indicator before it. Reading the commit message of the
change that introduced the sparsity state indicator, afda36dbf3b
(git-prompt: include sparsity state as well, 2020-06-21), it appears
this colourization also was unintended, so clearing the colour for said
indicator further increases consistency.

Make the colourization of these state indicators consistent by making
all colourized indicators clear their own colour. Make colouring of $c
dependent on it not being empty, as it is no longer being used to colour
the branch name. Move clearing of $b's prefix to before colourization so
it gets cleared properly when colour codes are inserted into it. These
changes make changing the layout of the prompt less prone to unintended
colour changes in the future.

Change coloured Bash prompt tests to reflect the colourization changes:
  * Move the colour codes to wrap the expected content of the expanded
    $__git_ps1_branch_name in all tests.
  * Insert a clear-colour code after the symbol for the first indicator
    in "prompt - bash color pc mode - dirty status indicator - dirty
    index and worktree", to reflect that all indicators should clear
    their own colour.

Signed-off-by: Joakim Petersen <joak-pet@xxxxxxxxx>
---
Changes since v6:
  * Remove repeated statements and move all explanation of what the patch
    does to the latter part of the message.
  * Add a short statement about other benefits of the behavioural change.

The handling of $w is different from the original (it used to be
that only '*' was painted in red, now any non-empty strings do), but
'*' is the only value that can be assigned to $w, so there is no
material difference.

Looking good.  Will queue.  Thanks.


The change regarding $w was mentioned below --- for v5:
> Changes since v4:
>  * The check for whether to colourize $w has been altered to match the
>    checks for the other indicators.
I'll add a mention of this to the commit message as well.



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