Add "commit" helper script

[git.git] / stripspace.c

diff --git a/stripspace.c b/stripspace.c
new file mode 100644 (file)
index 0000000..96cd0a8
--- /dev/null
+++ b/stripspace.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+/*
+ * Remove empty lines from the beginning and end.
+ *
+ * Turn multiple consecutive empty lines into just one
+ * empty line.
+ */
+static void cleanup(char *line)
+{
+       int len = strlen(line);
+
+       if (len > 1 && line[len-1] == '\n') {
+               do {
+                       unsigned char c = line[len-2];
+                       if (!isspace(c))
+                               break;
+                       line[len-2] = '\n';
+                       len--;
+                       line[len] = 0;
+               } while (len > 1);
+       }
+}
+
+int main(int argc, char **argv)
+{
+       int empties = -1;
+       char line[1024];
+
+       while (fgets(line, sizeof(line), stdin)) {
+               cleanup(line);
+
+               /* Not just an empty line? */
+               if (line[0] != '\n') {
+                       if (empties > 0)
+                               putchar('\n');
+                       empties = 0;
+                       fputs(line, stdout);
+                       continue;
+               }
+               if (empties < 0)
+                       continue;
+               empties++;
+       }
+       return 0;
+}