scdoc2mdoc

commit 01bbb8cb4538bb23aa152a59d77c8eb2129d41db
parent 8facd63447a77f450162a9cedfb4f1759bed7c72
Author: Stephen Gregoratto <dev@sgregoratto.me>
Date:   Sun, 16 Jun 2019 20:22:27 +1000

support reading files from arguments

Diffstat:
M
Makefile
 | 
6
+++---
M
main.c
 | 
23
++++++++++++++++-------

2 files changed, 19 insertions(+), 10 deletions(-)
diff --git a/Makefile b/Makefile
@@ -9,14 +9,14 @@ scdoc: $(OBJS)
 	$(CC) -g -o $@ $(OBJS)
 
 scdoc.1: scdoc.1.scd scdoc
-	./scdoc < scdoc.1.scd > $@
+	./scdoc scdoc.1.scd > $@
 
 scdoc.5: scdoc.5.scd scdoc
-	./scdoc < scdoc.5.scd > $@
+	./scdoc scdoc.5.scd > $@
 
 scdoc.pc: scdoc.pc.in
 	sed -e 's:@prefix@:$(PREFIX):g' \
-	    -e 's:@version@:$(VERSION):g' < scdoc.pc.in > $@
+	    -e 's:@version@:$(VERSION):g' scdoc.pc.in > $@
 
 main.o: str.h utf8.h util.h
 string.o: str.h utf8.h
diff --git a/main.c b/main.c
@@ -719,15 +719,21 @@ output_scdoc_preamble(struct parser *p)
 int
 main(int argc, char **argv)
 {
-	if (argc == 2 && strcmp(argv[1], "-v") == 0) {
-		printf("scdoc " VERSION "\n");
-		return 0;
-	} else if (argc > 1) {
-		fputs("Usage: scdoc < input.scd > output.roff", stderr);
-		return 1;
+	FILE *input;
+	if (argc > 2) {
+		fprintf(stderr, "%s: Too many arguments\n", argv[2]);
+		goto usage;
+	} else if (argc == 2) {
+		if ((input = fopen(argv[1], "r")) == NULL) {
+			fprintf(stderr, "cannot open file %s, exiting\n", argv[1]);
+			return 1;
+		}
+	} else {
+		input = stdin;
 	}
+
 	struct parser p = {
-		.input = stdin,
+		.input = input,
 		.output = stdout,
 		.line = 1,
 		.col = 1
@@ -736,4 +742,7 @@ main(int argc, char **argv)
 	parse_preamble(&p);
 	parse_document(&p);
 	return 0;
+usage:
+	fputs("usage: scdoc [file]\n", stderr);
+	return 1;
 }