t/test-lib.sh: add test_external and test_external_without_stderr

diff --git a/diff.c b/diff.c
index 62fdc5492bbe5dacab6bc5b615a76ba5cd9de760..526249008662d4041e5623914c1a420f3443c4d4 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -514,9 +514,15 @@ const char *diff_get_color(int diff_use_color, enum color_diff ix)
 
 static void emit_line(FILE *file, const char *set, const char *reset, const char *line, int len)
 {
+       int has_trailing_newline = (len > 0 && line[len-1] == '\n');
+       if (has_trailing_newline)
+               len--;
+
        fputs(set, file);
        fwrite(line, len, 1, file);
        fputs(reset, file);
+       if (has_trailing_newline)
+               fputc('\n', file);
 }
 
 static void emit_add_line(const char *reset, struct emit_callback *ecbdata, const char *line, int len)