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t4052: test for diffstat width when prefix contains ANSI escape codes

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Add test checking the calculation of the diffstat display width when the
`line_prefix`, which is text that goes before the diffstat, contains
ANSI escape codes.

This situation happens, for example, when `git log --stat --graph` is
executed:
* `--stat` will create a diffstat for each commit
* `--graph` will stuff `line_prefix` with the graph portion of the log,
  which contains ANSI escape codes to color the text

Signed-off-by: LorenzoPegorari <lorenzo.pegorari2002@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
LorenzoPegorari
2026-02-27 22:48:35 +01:00
committed by Junio C Hamano
parent 1a9df8de36
commit 064b869efc
1 changed files with 32 additions and 0 deletions
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32
t/t4052-stat-output.sh
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@@ -413,4 +413,36 @@ test_expect_success 'merge --stat respects COLUMNS with long name' '
test_cmp expect actual
'
# We want git-log to print only 1 commit containing a single branch graph and a
# diffstat (the diffstat display width, when not manually set through the
# option "--stat-width", will be automatically calculated).
# The diffstat will be only one file, with a placeholder FILENAME, that, with
# enough terminal display width, will contain the following line:
# "<RED>|<RESET> ${FILENAME} | 0"
# where "<RED>" and "<RESET>" are ANSI escape codes to color the text.
# To calculate the minimium terminal display width MIN_TERM_WIDTH so that the
# FILENAME in the diffstat will not be shortened, we take the FILENAME length
# and add 9 to it.
# To check if the diffstat width, when the line_prefix (the "<RED>|<RESET>" of
# the graph) contains ANSI escape codes (the ANSI escape codes to color the
# text), is calculated correctly, we:
# 1. check if it contains the line defined before when using MIN_TERM_WIDTH
# 2. check if it contains the line defined before, but with the FILENAME
# shortened by only one character, when using MIN_TERM_WIDTH - 1
test_expect_success 'diffstat where line_prefix contains ANSI escape codes is correct width' '
FILENAME="placeholder-text-placeholder-text" &&
FILENAME_TRIMMED="...eholder-text-placeholder-text" &&
MIN_TERM_WIDTH=$((${#FILENAME} + 9)) &&
test_config color.diff always &&
git commit --allow-empty --allow-empty-message &&
>${FILENAME} &&
git add ${FILENAME} &&
git commit --allow-empty-message &&
COLUMNS=$((MIN_TERM_WIDTH)) git log --graph --stat -n1 | test_decode_color >out &&
test_grep "<RED>|<RESET> ${FILENAME} | 0" out &&
COLUMNS=$((MIN_TERM_WIDTH - 1)) git log --graph --stat -n1 | test_decode_color >out &&
test_grep "<RED>|<RESET> ${FILENAME_TRIMMED} | 0" out
'
test_done