Implemented date subtitles.

Makefile

@@ -1,3 +1,4 @@
+NUM_LINKS_TO_SHOW=		50
 PARALLEL_DOWNLOADS=		8
 
 
@@ -20,11 +21,27 @@ index.gmi: \
 	sorted.gmi \
 	footer.gmi \
 
-	cat $+ > "$@"
+	> "$@"
+	cat header.gmi > "$@"
+	awk '\
+		BEGIN { \
+			D=""; \
+			T=""; \
+		} { \
+			if(D!=substr($$3, 0, 10)) { \
+				D=substr($$3, 0, 10); \
+				T="## "D"\n"; \
+				printf "%s", T; \
+			} \
+			$$3=""; \
+			print \
+		}' sorted.gmi \
+		| tee -a "$@"
+	cat footer.gmi >> "$@"
 
 
 sorted.gmi: downloaded.gmi
-	cat "$<" | sort -k 3 -r | uniq | head -100 > "$@"
+	cat "$<" | sort -k 3 -r | uniq | head -${NUM_LINKS_TO_SHOW} > "$@"
 
 
 downloaded.gmi: feeds.txt