From a65a6d62d19136e20ce6e6ec72d676a334dcc914 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Sat, 25 May 2019 16:51:10 +0000
Subject: [PATCH] Add <, >, <=, >= for formats, GitHub issue 1747.

---
 format.c | 39 ++++++++++++++++++++++++++++++++-------
 tmux.1   |  8 ++++++--
 2 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/format.c b/format.c
index a99db16b..b1f82cc6 100644
--- a/format.c
+++ b/format.c
@@ -1136,13 +1136,13 @@ format_build_modifiers(struct format_tree *ft, const char **s, u_int *count)
 
 	/*
 	 * Modifiers are a ; separated list of the forms:
-	 *      l,m,C,b,d,t,q,E,T,S,W,P
+	 *      l,m,C,b,d,t,q,E,T,S,W,P,<,>
 	 *	=a
 	 *	=/a
 	 *      =/a/
 	 *	s/a/b/
 	 *	s/a/b
-	 *	||,&&,!=,==
+	 *	||,&&,!=,==,<=,>=
 	 */
 
 	*count = 0;
@@ -1153,7 +1153,7 @@ format_build_modifiers(struct format_tree *ft, const char **s, u_int *count)
 			cp++;
 
 		/* Check single character modifiers with no arguments. */
-		if (strchr("lmCbdtqETSWP", cp[0]) != NULL &&
+		if (strchr("lmCbdtqETSWP<>", cp[0]) != NULL &&
 		    format_is_end(cp[1])) {
 			format_add_modifier(&list, count, cp, 1, NULL, 0);
 			cp++;
@@ -1164,7 +1164,9 @@ format_build_modifiers(struct format_tree *ft, const char **s, u_int *count)
 		if ((memcmp("||", cp, 2) == 0 ||
 		    memcmp("&&", cp, 2) == 0 ||
 		    memcmp("!=", cp, 2) == 0 ||
-		    memcmp("==", cp, 2) == 0) &&
+		    memcmp("==", cp, 2) == 0 ||
+		    memcmp("<=", cp, 2) == 0 ||
+		    memcmp(">=", cp, 2) == 0) &&
 		    format_is_end(cp[2])) {
 			format_add_modifier(&list, count, cp, 2, NULL, 0);
 			cp += 2;
@@ -1433,6 +1435,8 @@ format_replace(struct format_tree *ft, const char *key, size_t keylen,
 		if (fm->size == 1) {
 			switch (fm->modifier[0]) {
 			case 'm':
+			case '<':
+			case '>':
 				cmp = fm;
 				break;
 			case 'C':
@@ -1486,7 +1490,9 @@ format_replace(struct format_tree *ft, const char *key, size_t keylen,
 			if (strcmp(fm->modifier, "||") == 0 ||
 			    strcmp(fm->modifier, "&&") == 0 ||
 			    strcmp(fm->modifier, "==") == 0 ||
-			    strcmp(fm->modifier, "!=") == 0)
+			    strcmp(fm->modifier, "!=") == 0 ||
+			    strcmp(fm->modifier, ">=") == 0 ||
+			    strcmp(fm->modifier, "<=") == 0)
 				cmp = fm;
 		}
 	}
@@ -1549,8 +1555,27 @@ format_replace(struct format_tree *ft, const char *key, size_t keylen,
 				value = xstrdup("1");
 			else
 				value = xstrdup("0");
-		}
-		else if (strcmp(cmp->modifier, "m") == 0) {
+		} else if (strcmp(cmp->modifier, "<") == 0) {
+			if (strcmp(left, right) < 0)
+				value = xstrdup("1");
+			else
+				value = xstrdup("0");
+		} else if (strcmp(cmp->modifier, ">") == 0) {
+			if (strcmp(left, right) > 0)
+				value = xstrdup("1");
+			else
+				value = xstrdup("0");
+		} else if (strcmp(cmp->modifier, "<=") == 0) {
+			if (strcmp(left, right) <= 0)
+				value = xstrdup("1");
+			else
+				value = xstrdup("0");
+		} else if (strcmp(cmp->modifier, ">=") == 0) {
+			if (strcmp(left, right) >= 0)
+				value = xstrdup("1");
+			else
+				value = xstrdup("0");
+		} else if (strcmp(cmp->modifier, "m") == 0) {
 			if (fnmatch(left, right, 0) == 0)
 				value = xstrdup("1");
 			else
diff --git a/tmux.1 b/tmux.1
index 4c86ac95..5e1a223e 100644
--- a/tmux.1
+++ b/tmux.1
@@ -3946,9 +3946,13 @@ For example:
 .Pp
 Comparisons may be expressed by prefixing two comma-separated
 alternatives by
-.Ql ==
+.Ql == ,
+.Ql != ,
+.Ql < ,
+.Ql > ,
+.Ql <=
 or
-.Ql !=
+.Ql >=
 and a colon.
 For example
 .Ql #{==:#{host},myhost}