t4052: test for diffstat width when prefix contains ANSI escape codes
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>
LorenzoPegorari committed
Feb 27, 2026 at 22:48 UTC
064b869efc50be2557015665bc3dc8ac9008a6e4
1 file changed
+32
t/t4052-stat-output.sh
+32
@@ -413,4 +413,36 @@ test_expect_success 'merge --stat respects COLUMNS with long name' '
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test_cmp expect actual
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'
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+# We want git-log to print only 1 commit containing a single branch graph and a
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+# diffstat (the diffstat display width, when not manually set through the
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+# option "--stat-width", will be automatically calculated).
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+# The diffstat will be only one file, with a placeholder FILENAME, that, with
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+# enough terminal display width, will contain the following line:
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+# "<RED>|<RESET> ${FILENAME} | 0"
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+# where "<RED>" and "<RESET>" are ANSI escape codes to color the text.
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+# To calculate the minimium terminal display width MIN_TERM_WIDTH so that the
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+# FILENAME in the diffstat will not be shortened, we take the FILENAME length
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+# and add 9 to it.
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+# To check if the diffstat width, when the line_prefix (the "<RED>|<RESET>" of
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+# the graph) contains ANSI escape codes (the ANSI escape codes to color the
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+# text), is calculated correctly, we:
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+# 1. check if it contains the line defined before when using MIN_TERM_WIDTH
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+# 2. check if it contains the line defined before, but with the FILENAME
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+# shortened by only one character, when using MIN_TERM_WIDTH - 1
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+
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+test_expect_success 'diffstat where line_prefix contains ANSI escape codes is correct width' '
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+ FILENAME="placeholder-text-placeholder-text" &&
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+ FILENAME_TRIMMED="...eholder-text-placeholder-text" &&
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+ MIN_TERM_WIDTH=$((${#FILENAME} + 9)) &&
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+ test_config color.diff always &&
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+ git commit --allow-empty --allow-empty-message &&
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+ >${FILENAME} &&
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+ git add ${FILENAME} &&
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+ git commit --allow-empty-message &&
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+ COLUMNS=$((MIN_TERM_WIDTH)) git log --graph --stat -n1 | test_decode_color >out &&
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+ test_grep "<RED>|<RESET> ${FILENAME} | 0" out &&
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+ COLUMNS=$((MIN_TERM_WIDTH - 1)) git log --graph --stat -n1 | test_decode_color >out &&
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+ test_grep "<RED>|<RESET> ${FILENAME_TRIMMED} | 0" out
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+'
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+
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test_done