From a2915cfdeff37d3b7a56d059388cdb575bdbf6e9 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Fri, 26 Jun 2026 16:09:55 +0100
Subject: [PATCH] Fuzzy test.

---
 regress/format-fuzzy.sh | 106 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 regress/format-fuzzy.sh

diff --git a/regress/format-fuzzy.sh b/regress/format-fuzzy.sh
new file mode 100644
index 000000000..31a5b60cb
--- /dev/null
+++ b/regress/format-fuzzy.sh
@@ -0,0 +1,106 @@
+#!/bin/sh
+
+# Tests of fuzzy format matching.
+
+PATH=/bin:/usr/bin
+TERM=screen
+
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+TMUX="$TEST_TMUX -Ltest -f/dev/null"
+
+# test_format $format $expected_result
+test_format()
+{
+	fmt="$1"
+	exp="$2"
+
+	out=$($TMUX display-message -p "$fmt")
+
+	if [ "$out" != "$exp" ]; then
+		echo "Fuzzy format test failed for '$fmt'."
+		echo "Expected: '$exp'"
+		echo "But got   '$out'"
+		exit 1
+	fi
+}
+
+$TMUX kill-server 2>/dev/null
+$TMUX -f/dev/null new-session -d || exit 1
+
+# Empty pattern matches everything but has no highlighted positions.
+test_format '#{m/z:,abc}' '1'
+test_format '#{m/p:,abc}' ''
+
+# Plain fuzzy matching and positions.
+test_format '#{m/z:abc,a_b_c}' '1'
+test_format '#{m/p:abc,a_b_c}' '0,2,4'
+test_format '#{m/z:abc,acb}' '0'
+test_format '#{m/p:abc,acb}' ''
+
+# Multiple terms are ANDed. Positions are for all positive matched terms.
+test_format '#{m/z:dev bash,dev:1 bash}' '1'
+test_format '#{m/p:dev bash,dev:1 bash}' '0,1,2,6,7,8,9'
+test_format '#{m/z:dev bash,dev:1 sh}' '0'
+test_format '#{m/p:dev bash,dev:1 sh}' ''
+
+# Lowercase patterns are case-insensitive for ASCII; uppercase makes the
+# pattern case-sensitive.
+test_format '#{m/z:abc,ABC}' '1'
+test_format '#{m/p:abc,ABC}' '0,1,2'
+test_format '#{m/z:ABC,abc}' '0'
+test_format '#{m/p:ABC,abc}' ''
+
+# Exact substring matching with a leading quote.
+test_format "#{m/z:'bash,dev bash}" '1'
+test_format "#{m/p:'bash,dev bash}" '4,5,6,7'
+test_format "#{m/z:'bash,b-a-s-h}" '0'
+test_format "#{m/p:'bash,b-a-s-h}" ''
+
+# Prefix and suffix matching.
+test_format '#{m/z:^dev,dev bash}' '1'
+test_format '#{m/p:^dev,dev bash}' '0,1,2'
+test_format '#{m/z:^dev,prod dev}' '0'
+test_format '#{m/p:^dev,prod dev}' ''
+test_format '#{m/z:bash$,dev bash}' '1'
+test_format '#{m/p:bash$,dev bash}' '4,5,6,7'
+test_format '#{m/z:bash$,bash dev}' '0'
+test_format '#{m/p:bash$,bash dev}' ''
+
+# Inverse terms. Plain inverse terms are exact substring tests, not fuzzy.
+test_format '#{m/z:!ssh,dev bash}' '1'
+test_format '#{m/z:!ssh,dev ssh}' '0'
+test_format '#{m/z:!ssh,s_s_h}' '1'
+test_format '#{m/z:dev !ssh,dev bash}' '1'
+test_format '#{m/p:dev !ssh,dev bash}' '0,1,2'
+test_format '#{m/z:dev !ssh,dev ssh}' '0'
+test_format '#{m/p:dev !ssh,dev ssh}' ''
+
+# OR separates groups; each group is an AND of its terms.
+test_format '#{m/z:prod | dev,dev bash}' '1'
+test_format '#{m/p:prod | dev,dev bash}' '0,1,2'
+test_format '#{m/z:prod | dev,prod bash}' '1'
+test_format '#{m/p:prod | dev,prod bash}' '0,1,2,3'
+test_format '#{m/z:prod | dev,test bash}' '0'
+test_format '#{m/p:prod | dev,test bash}' ''
+
+# Style sequences do not count towards display positions.
+test_format '#{m/z:dev,#[bold]dev#[default]}' '1'
+test_format '#{m/p:dev,#[bold]dev#[default]}' '0,1,2'
+test_format '#{m/p:dev,#[fg=red#,bg=blue]dev#[default]}' '0,1,2'
+test_format '#{m/p:dev,#[bold]d#[default]e#[underscore]v#[default]}' '0,1,2'
+test_format '#{m/p:bash,#[bold]dev#[default] bash}' '4,5,6,7'
+
+# UTF-8. Non-ASCII matching is exact, even when ASCII would fold case.
+test_format '#{m/z:é,café}' '1'
+test_format '#{m/p:é,café}' '3'
+test_format '#{m/z:é,É}' '0'
+test_format '#{m/p:é,É}' ''
+test_format '#{m/z:éx,éx}' '1'
+test_format '#{m/p:éx,éx}' '0,1'
+
+# Wide UTF-8 characters occupy two display cells and both should be marked for
+# highlighting.
+test_format '#{m/z:界,a界b}' '1'
+test_format '#{m/p:界,a界b}' '1,2'
+
+exit 0