From 6446070da557bf8b56fa44b2bbdc4690edf490a9 Mon Sep 17 00:00:00 2001
From: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Wed, 22 Aug 2018 16:23:52 +0200
Subject: add sfeed_twtxt format program: format to a twtxt feed

---
 Makefile      |  1 +
 README        |  3 ++-
 sfeed_twtxt.1 | 30 +++++++++++++++++++++++
 sfeed_twtxt.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 109 insertions(+), 1 deletion(-)
 create mode 100644 sfeed_twtxt.1
 create mode 100644 sfeed_twtxt.c

diff --git a/Makefile b/Makefile
index 5c72001..eed1299 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,7 @@ BIN = \
 	sfeed_opml_import\
 	sfeed_plain\
 	sfeed_tail\
+	sfeed_twtxt\
 	sfeed_web\
 	sfeed_xmlenc
 SCRIPTS = \
diff --git a/README b/README
index afe01d4..5d3df96 100644
--- a/README
+++ b/README
@@ -111,7 +111,8 @@ sfeed_opml_export - Generate an OPML XML file from a sfeedrc config file.
 sfeed_opml_import - Generate a sfeedrc config file from an OPML XML file.
 sfeed_mbox        - Format feed data (TSV) to mbox.
 sfeed_plain       - Format feed data (TSV) to a plain-text list.
-sfeed_tail        - format unseen feed data (TSV) to a plain-text list.
+sfeed_tail        - Format unseen feed data (TSV) to a plain-text list.
+sfeed_twtxt       - Format feed data (TSV) to a twtxt feed.
 sfeed_update      - Update feeds and merge with old feeds in the directory
                     $HOME/.sfeed/feeds by default.
 sfeed_web         - Find urls to RSS/Atom feed from a webpage.
diff --git a/sfeed_twtxt.1 b/sfeed_twtxt.1
new file mode 100644
index 0000000..14da7f2
--- /dev/null
+++ b/sfeed_twtxt.1
@@ -0,0 +1,30 @@
+.Dd August 22, 2018
+.Dt SFEED_TWTXT 1
+.Os
+.Sh NAME
+.Nm sfeed_twtxt
+.Nd format feed data to a twtxt feed
+.Sh SYNOPSIS
+.Nm
+.Op Ar file...
+.Sh DESCRIPTION
+.Nm
+formats feed data (TSV) from
+.Xr sfeed 1
+from stdin or
+.Ar file
+to stdout as a twtxt feed.
+If one or more
+.Ar file
+are specified, the basename of the
+.Ar file
+is used as the feed name in the output.
+If no
+.Ar file
+parameters are specified and so the data is read from stdin the feed name
+is empty.
+.Sh SEE ALSO
+.Xr sfeed 1 ,
+.Xr sfeed_plain 1
+.Sh AUTHORS
+.An Hiltjo Posthuma Aq Mt hiltjo@codemadness.org
diff --git a/sfeed_twtxt.c b/sfeed_twtxt.c
new file mode 100644
index 0000000..5df0fa1
--- /dev/null
+++ b/sfeed_twtxt.c
@@ -0,0 +1,76 @@
+#include <ctype.h>
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "util.h"
+
+static char *line;
+static size_t linesize;
+
+static void
+printfeed(FILE *fp, const char *feedname)
+{
+	char *fields[FieldLast];
+	struct tm *tm;
+	time_t parsedtime;
+	ssize_t linelen;
+
+	while ((linelen = getline(&line, &linesize, fp)) > 0) {
+		if (line[linelen - 1] == '\n')
+			line[--linelen] = '\0';
+		if (!parseline(line, fields))
+			break;
+
+		parsedtime = 0;
+		if (strtotime(fields[FieldUnixTimestamp], &parsedtime))
+			continue;
+	        if (!(tm = gmtime(&parsedtime)))
+			err(1, "localtime");
+
+	        fprintf(stdout, "%04d-%02d-%02dT%02d:%02d:%02dZ\t",
+		        tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
+		        tm->tm_hour, tm->tm_min, tm->tm_sec);
+		if (feedname[0])
+			printf("[%s] ", feedname);
+		fputs(fields[FieldTitle], stdout);
+		if (fields[FieldLink][0]) {
+			fputs(" @<", stdout);
+			if (fields[FieldAuthor][0]) {
+				fputs(fields[FieldAuthor], stdout);
+				fputs(" ", stdout);
+			}
+			fputs(fields[FieldLink], stdout);
+			fputs(">", stdout);
+		}
+		putchar('\n');
+	}
+}
+
+int
+main(int argc, char *argv[])
+{
+	FILE *fp;
+	char *name;
+	int i;
+
+	if (pledge(argc == 1 ? "stdio" : "stdio rpath", NULL) == -1)
+		err(1, "pledge");
+
+	if (argc == 1) {
+		printfeed(stdin, "");
+	} else {
+		for (i = 1; i < argc; i++) {
+			if (!(fp = fopen(argv[i], "r")))
+				err(1, "fopen: %s", argv[i]);
+			name = ((name = strrchr(argv[i], '/'))) ? name + 1 : argv[i];
+			printfeed(fp, name);
+			if (ferror(fp))
+				err(1, "ferror: %s", argv[i]);
+			fclose(fp);
+		}
+	}
+	return 0;
+}
-- 
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