From 619f7eab8fa93116e66d839d057a276e54a59085 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Wed, 21 Jul 2021 14:44:47 +0200
Subject: pf: Try not to repeat puncuation after %

---
 fref.lex | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/fref.lex b/fref.lex
index 5a35bd4..2b0861d 100644
--- a/fref.lex
+++ b/fref.lex
@@ -164,7 +164,7 @@ entry()
 
 	/* Print date. */
 	if(!pf(" (%).\n", e.da) && e.a){
-		if(e.au[i][strlen(e.au[i])-1] != '.')
+		if(!strpbrk(e.au[i]+strlen(e.au[i])-1, ".,?!"))
 			pf(".");
 		pf("\n");
 	}
@@ -273,13 +273,14 @@ gettrans(char *lg)
  * This function interpolates any number of strings into a formatted
  * string, which is printed only if all interpolated strings are non-empty.
  * Interpolation points are marked by % or *. If a string is interpolated
- * using %, the function empties it after printing it.
+ * using %, the function empties it after printing it. Additionally, the
+ * function tries not to repeat punctuation after %.
  */
 int
 pf(char *fmt, ...)
 {
 	char *buf, *p, **fs;
-	int i, n, sz;
+	int i, n, punct, sz;
 	va_list ap;
 
 	/* Count interpolated strings. */
@@ -303,19 +304,33 @@ pf(char *fmt, ...)
 	}
 	va_end(ap);
 
+	/* Keep track of prior punctuation. */
+	punct = 0;
+
 	/* Print formatted string. */
 	for(i = 0; *fmt; fmt++)
 		switch(*fmt){
 		case '%':
+			p = fs[i]+strlen(fs[i])-1;
+			punct = strpbrk(p, ".,?!") ? 1 : 0;
 			printf("%s", fs[i]);
 			fs[i][0] = 0;
 			i++;
 			break;
 		case '*':
+			punct = 0;
 			printf("%s", fs[i]);
 			i++;
 			break;
+		case '.':
+		case ',':
+		case '?':
+		case '!':
+			if(punct && punct--)
+				break;
+			/* FALLTHROUGH */
 		default:
+			punct = 0;
 			putchar(*fmt);
 		}
 	return 1;
-- 
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