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#include "cache.h"
#include "run-command.h"
#include "sigchain.h"

#ifndef DEFAULT_PAGER
#define DEFAULT_PAGER "less"
#endif

/*
* This is split up from the rest of git so that we can do
* something different on Windows.
*/

#ifndef WIN32
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);
}
#endif

static const char *pager_argv[] = { 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);
}

const char *git_pager(int stdout_is_tty)
{
const char *pager;

if (!stdout_is_tty)
return NULL;

pager = getenv("GIT_PAGER");
if (!pager) {
if (!pager_program)
git_config(git_default_config, NULL);
pager = pager_program;
}
if (!pager)
pager = getenv("PAGER");
if (!pager)
pager = DEFAULT_PAGER;
else if (!*pager || !strcmp(pager, "cat"))
pager = NULL;

return pager;
}

void setup_pager(void)
{
const char *pager = git_pager(isatty(1));

if (!pager || pager_in_use())
return;

/*
* force computing the width of the terminal before we redirect
* the standard output to the pager.
*/
(void) term_columns();

setenv("GIT_PAGER_IN_USE", "true", 1);

/* spawn the pager */
pager_argv[0] = pager;
pager_process.use_shell = 1;
pager_process.argv = pager_argv;
pager_process.in = -1;
if (!getenv("LESS")) {
static const char *env[] = { "LESS=FRSX", NULL };
pager_process.env = env;
}
#ifndef WIN32
pager_process.preexec_cb = pager_preexec;
#endif
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;
env = getenv("GIT_PAGER_IN_USE");
return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0;
}

/*
* Return cached value (if set) or $COLUMNS environment variable (if
* set and positive) or ioctl(1, TIOCGWINSZ).ws_col (if positive),
* and default to 80 if all else fails.
*/
int term_columns(void)
{
static int term_columns_at_startup;

char *col_string;
int n_cols;

if (term_columns_at_startup)
return term_columns_at_startup;

term_columns_at_startup = 80;

col_string = getenv("COLUMNS");
if (col_string && (n_cols = atoi(col_string)) > 0)
term_columns_at_startup = n_cols;
#ifdef TIOCGWINSZ
else {
struct winsize ws;
if (!ioctl(1, TIOCGWINSZ, &ws) && ws.ws_col)
term_columns_at_startup = ws.ws_col;
}
#endif

return term_columns_at_startup;
}

/*
* How many columns do we need to show this number in decimal?
*/
int decimal_width(int number)
{
int i, width;

for (width = 1, i = 10; i <= number; width++)
i *= 10;
return width;
}
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