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#include "cache.h"
#include "run-command.h"
#include "sigchain.h"
/*
* This is split up from the rest of git so that we can do
* something different on Windows.
*/
static int spawned_pager;
static void pager_preexec(void)
{
/*
* Work around bug in "less" by not starting it until we
* have real input
*/
fd_set in;
FD_ZERO(&in);
FD_SET(0, &in);
select(1, &in, NULL, &in, NULL);
setenv("LESS", "FRSX", 0);
}
static const char *pager_argv[] = { "sh", "-c", NULL, NULL };
static struct child_process pager_process;
static void wait_for_pager(void)
{
fflush(stdout);
fflush(stderr);
/* signal EOF to pager */
close(1);
close(2);
finish_command(&pager_process);
}
static void wait_for_pager_signal(int signo)
{
wait_for_pager();
sigchain_pop(signo);
raise(signo);
}
static int check_pager(const char *pager)
{
char *env_path;
char *pager_path;
char *path;
struct stat stat_buf;
env_path = getenv("PATH");
pager_path = malloc(strlen(env_path) + strlen(pager) + 2);
if (pager_path == NULL)
return -1;
path = strtok(env_path, ":");
while (path) {
strcpy(pager_path, path);
strcat(pager_path, "/");
strcat(pager_path, pager);
if (!stat(pager_path, &stat_buf)) {
free(pager_path);
return 0;
}
path = strtok(NULL, ":");
}
free(pager_path);
return -1;
}
void setup_pager(void)
{
const char *pager = getenv("PERF_PAGER");
if (!isatty(1))
return;
if (!pager) {
if (!pager_program)
perf_config(perf_default_config, NULL);
pager = pager_program;
}
if (!pager)
pager = getenv("PAGER");
if (!pager)
if (!check_pager("less"))
pager = "less";
else
pager = "/bin/more";
else if (!*pager || !strcmp(pager, "cat"))
return;
spawned_pager = 1; /* means we are emitting to terminal */
/* spawn the pager */
pager_argv[2] = pager;
pager_process.argv = pager_argv;
pager_process.in = -1;
pager_process.preexec_cb = pager_preexec;
if (start_command(&pager_process))
return;
/* original process continues, but writes to the pipe */
dup2(pager_process.in, 1);
if (isatty(2))
dup2(pager_process.in, 2);
close(pager_process.in);
/* this makes sure that the parent terminates after the pager */
sigchain_push_common(wait_for_pager_signal);
atexit(wait_for_pager);
}
int pager_in_use(void)
{
const char *env;
if (spawned_pager)
return 1;
env = getenv("PERF_PAGER_IN_USE");
return env ? perf_config_bool("PERF_PAGER_IN_USE", env) : 0;
}
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