Commit f67b45f8 authored by Linus Torvalds's avatar Linus Torvalds Committed by Junio C Hamano

Introduce trivial new pager.c helper infrastructure

This introduces the new function

	void setup_pager(void);

to set up output to be written through a pager applocation.

All in preparation for doing the simple scripts in C.
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
Signed-off-by: default avatarJunio C Hamano <junkio@cox.net>
parent a4a88b2b
......@@ -205,7 +205,7 @@ LIB_OBJS = \
quote.o read-cache.o refs.o run-command.o \
server-info.o setup.o sha1_file.o sha1_name.o strbuf.o \
tag.o tree.o usage.o config.o environment.o ctype.o copy.o \
fetch-clone.o revision.o \
fetch-clone.o revision.o pager.o \
$(DIFF_OBJS)
LIBS = $(LIB_FILE)
......
......@@ -352,4 +352,7 @@ extern int copy_fd(int ifd, int ofd);
extern int receive_unpack_pack(int fd[2], const char *me, int quiet);
extern int receive_keep_pack(int fd[2], const char *me, int quiet);
/* pager.c */
extern void setup_pager(void);
#endif /* CACHE_H */
#include "cache.h"
/*
* This is split up from the rest of git so that we might do
* something different on Windows, for example.
*/
static void run_pager(void)
{
const char *prog = getenv("PAGER");
if (!prog)
prog = "less";
setenv("LESS", "-S", 0);
execlp(prog, prog, NULL);
}
void setup_pager(void)
{
pid_t pid;
int fd[2];
if (!isatty(1))
return;
if (pipe(fd) < 0)
return;
pid = fork();
if (pid < 0) {
close(fd[0]);
close(fd[1]);
return;
}
/* return in the child */
if (!pid) {
dup2(fd[1], 1);
close(fd[0]);
close(fd[1]);
return;
}
/* The original process turns into the PAGER */
dup2(fd[0], 0);
close(fd[0]);
close(fd[1]);
run_pager();
exit(255);
}
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment