allow . to match all summaries

docs/changelog.txt

@@ -2,6 +2,8 @@ changelog
 
 === next
 
++ Filter to match anything with summary/warning.
+
 + Start collecting quties.
 
 + Fix http signatures for GET requests.

docs/hfcs.1

@@ -51,6 +51,7 @@ fields as well.
 .It Ar text
 Regular expression match against the post
 .Fa content .
+The special value of "." will match any post with a summary only.
 .It Ar is announce
 Is announced (shared).
 .It Ar announce of

hfcs.go

@@ -107,7 +107,7 @@ func filtcachefiller(userid int64) (afiltermap, bool) {
 				expflush = filt.Expiration
 			}
 		}
-		if t := filt.Text; t != "" {
+		if t := filt.Text; t != "" && t != "." {
 			wordfront := t[0] != '#'
 			wordtail := true
 			t = "(?i:" + t + ")"
@@ -314,7 +314,7 @@ func matchfilterX(h *Honk, f *Filter) string {
 			rv += " announce"
 		}
 	}
-	if match && f.Text != "" {
+	if match && f.Text != "" && f.Text != "." {
 		match = false
 		re := f.re_text
 		m := re.FindString(h.Precis)
@@ -334,6 +334,13 @@ func matchfilterX(h *Honk, f *Filter) string {
 			rv = m
 		}
 	}
+	if match && f.Text == "." {
+		match = false
+		if h.Precis != "" {
+			match = true
+			rv = h.Precis
+		}
+	}
 	if match {
 		return rv
 	}