iris

commit 36440fedf7a1810050ee29c45dcf772cdeda6d27
parent c68887a9d589fcbd27ac1c1aa1270785246cba73
Author: sin <sin@2f30.org>
Date:   Fri,  9 May 2014 17:17:05 +0100

Handle gracefully non-interactive input

echo '()' | ./iris etc.

Diffstat:
M
repl.c
 | 
16
+++++++++++-----

1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/repl.c b/repl.c
@@ -2,6 +2,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <unistd.h>
 #include "lexer.h"
 #include "debug.h"
 #include "util.h"
@@ -25,18 +26,23 @@ main(void)
 {
 	char *buf = NULL;
 	size_t sz = 0;
+	int interactive = isatty(fileno(stdin));
 
-	puts("Welcome to iris, use ^C to quit");
+	if (interactive == 1)
+		puts("Welcome to iris, use ^C to quit");
 	do {
-		printf("> ");
-		fflush(stdout);
+		if (interactive == 1) {
+			printf("> ");
+			fflush(stdout);
+		}
 		if (afgets(&buf, &sz, stdin))
 			lexertest(buf);
 		if (ferror(stdin)) {
 			fprintf(stderr, "input error\n");
 			return EXIT_FAILURE;
 		}
-	} while (1);
-	/* not reachable */
+		fflush(stdout);
+	} while (interactive == 1);
+	free(buf);
 	return 0;
 }