Re: Minor cosmetic defect in git-pack-objects output

["René Scharfe" <rene.scharfe@lsrfire.ath.cx>]

Am 29.03.2011 12:10, schrieb Antonio Ospite:
> Hi,
> 
> in some cases, on git-pack-objects failure, there is a small defect in
> the output, see:
> 
> # git gc --aggressive
> Counting objects: 1954118, done.
> Delta compression using up to 2 threads.
> warning: suboptimal pack - out of memory02)
> Compressing objects: 100% (1936802/1936802), done.
> Writing objects: 100% (1954118/1954118), done.
> Total 1954118 (delta 1618716), reused 0 (delta 0)
> 
> The defect is here:
> warning: suboptimal pack - out of memory02)
>                                          ^^^
> the trailing chars are from the replaced line which was ending in
> 1936802)
> 
> AFAICS this is basically what is happening:
> #include "git-compat-util.h"
> fprintf(stderr, "Compressing objects:  15% (296661/1936802)\r");
>                   warning("suboptimal pack - out of memory");
> 
> I can think to a dumb workaround for this particular path but maybe
> there are other places when this can happen as well.

The following patch should avoid it by clearing the the rest of the
line after warnings, error messages, usage notes etc. if stderr is a
terminal.

René

---
 usage.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/usage.c b/usage.c
index b5e67e3..36f1968 100644
--- a/usage.c
+++ b/usage.c
@@ -9,7 +9,7 @@ void vreportf(const char *prefix, const char *err, va_list params)
 {
 	char msg[4096];
 	vsnprintf(msg, sizeof(msg), err, params);
-	fprintf(stderr, "%s%s\n", prefix, msg);
+	fprintf(stderr, "%s%s%s\n", prefix, msg, isatty(2) ? "\033[K" : "");
 }
 
 static NORETURN void usage_builtin(const char *err, va_list params)