| #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; |
| |
| #ifndef __MINGW32__ |
| 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); |
| } |
| #endif |
| |
| 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); |
| } |
| |
| void setup_pager(void) |
| { |
| const char *pager = getenv("GIT_PAGER"); |
| |
| if (!isatty(1)) |
| return; |
| if (!pager) { |
| if (!pager_program) |
| git_config(git_default_config, NULL); |
| pager = pager_program; |
| } |
| if (!pager) |
| pager = getenv("PAGER"); |
| if (!pager) |
| pager = "less"; |
| 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; |
| #ifndef __MINGW32__ |
| 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; |
| |
| if (spawned_pager) |
| return 1; |
| |
| env = getenv("GIT_PAGER_IN_USE"); |
| return env ? git_config_bool("GIT_PAGER_IN_USE", env) : 0; |
| } |