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authorLinus Torvalds <torvalds@osdl.org>2006-02-28 19:26:21 (GMT)
committerJunio C Hamano <junkio@cox.net>2006-02-28 22:49:32 (GMT)
commitf67b45f862d17b54037b9b59eefc385624d1fa83 (patch)
tree072f8159ea1d9c39899e7644f251d250de5c976f
parenta4a88b2bab3b6fb0b30f63418701f42388e0fe0a (diff)
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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: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
-rw-r--r--Makefile2
-rw-r--r--cache.h3
-rw-r--r--pager.c48
3 files changed, 52 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index 3575489..0b1a998 100644
--- a/Makefile
+++ b/Makefile
@@ -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)
diff --git a/cache.h b/cache.h
index 58eec00..3af6b86 100644
--- a/cache.h
+++ b/cache.h
@@ -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 */
diff --git a/pager.c b/pager.c
new file mode 100644
index 0000000..1364e15
--- /dev/null
+++ b/pager.c
@@ -0,0 +1,48 @@
+#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);
+}