Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "strbuf.h"
   3#include "run-command.h"
   4#include "sigchain.h"
   5
   6#ifndef DEFAULT_EDITOR
   7#define DEFAULT_EDITOR "vi"
   8#endif
   9
  10int is_terminal_dumb(void)
  11{
  12        const char *terminal = getenv("TERM");
  13        return !terminal || !strcmp(terminal, "dumb");
  14}
  15
  16const char *git_editor(void)
  17{
  18        const char *editor = getenv("GIT_EDITOR");
  19        int terminal_is_dumb = is_terminal_dumb();
  20
  21        if (!editor && editor_program)
  22                editor = editor_program;
  23        if (!editor && !terminal_is_dumb)
  24                editor = getenv("VISUAL");
  25        if (!editor)
  26                editor = getenv("EDITOR");
  27
  28        if (!editor && terminal_is_dumb)
  29                return NULL;
  30
  31        if (!editor)
  32                editor = DEFAULT_EDITOR;
  33
  34        return editor;
  35}
  36
  37int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
  38{
  39        const char *editor = git_editor();
  40
  41        if (!editor)
  42                return error("Terminal is dumb, but EDITOR unset");
  43
  44        if (strcmp(editor, ":")) {
  45                const char *args[] = { editor, real_path(path), NULL };
  46                struct child_process p = CHILD_PROCESS_INIT;
  47                int ret, sig;
  48                int print_waiting_for_editor = advice_waiting_for_editor && isatty(2);
  49
  50                if (print_waiting_for_editor) {
  51                        /*
  52                         * A dumb terminal cannot erase the line later on. Add a
  53                         * newline to separate the hint from subsequent output.
  54                         *
  55                         * Make sure that our message is separated with a whitespace
  56                         * from further cruft that may be written by the editor.
  57                         */
  58                        const char term = is_terminal_dumb() ? '\n' : ' ';
  59
  60                        fprintf(stderr,
  61                                _("hint: Waiting for your editor to close the file...%c"),
  62                                term);
  63                        fflush(stderr);
  64                }
  65
  66                p.argv = args;
  67                p.env = env;
  68                p.use_shell = 1;
  69                if (start_command(&p) < 0)
  70                        return error("unable to start editor '%s'", editor);
  71
  72                sigchain_push(SIGINT, SIG_IGN);
  73                sigchain_push(SIGQUIT, SIG_IGN);
  74                ret = finish_command(&p);
  75                sig = ret - 128;
  76                sigchain_pop(SIGINT);
  77                sigchain_pop(SIGQUIT);
  78                if (sig == SIGINT || sig == SIGQUIT)
  79                        raise(sig);
  80                if (ret)
  81                        return error("There was a problem with the editor '%s'.",
  82                                        editor);
  83
  84                if (print_waiting_for_editor && !is_terminal_dumb())
  85                        /*
  86                         * Go back to the beginning and erase the entire line to
  87                         * avoid wasting the vertical space.
  88                         */
  89                        fputs("\r\033[K", stderr);
  90        }
  91
  92        if (!buffer)
  93                return 0;
  94        if (strbuf_read_file(buffer, path, 0) < 0)
  95                return error_errno("could not read file '%s'", path);
  96        return 0;
  97}