editor.c

   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
  10 const char *git_editor(void)
  11 {
  12         const char *editor = getenv("GIT_EDITOR");
  13         const char *terminal = getenv("TERM");
  14         int terminal_is_dumb = !terminal || !strcmp(terminal, "dumb");
  15
  16         if (!editor && editor_program)
  17                 editor = editor_program;
  18         if (!editor && !terminal_is_dumb)
  19                 editor = getenv("VISUAL");
  20         if (!editor)
  21                 editor = getenv("EDITOR");
  22
  23         if (!editor && terminal_is_dumb)
  24                 return NULL;
  25
  26         if (!editor)
  27                 editor = DEFAULT_EDITOR;
  28
  29         return editor;
  30 }
  31
  32 int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
  33 {
  34         const char *editor = git_editor();
  35
  36         if (!editor)
  37                 return error("Terminal is dumb, but EDITOR unset");
  38
  39         if (strcmp(editor, ":")) {
  40                 const char *args[] = { editor, real_path(path), NULL };
  41                 struct child_process p;
  42                 int ret, sig;
  43
  44                 memset(&p, 0, sizeof(p));
  45                 p.argv = args;
  46                 p.env = env;
  47                 p.use_shell = 1;
  48                 if (start_command(&p) < 0)
  49                         return error("unable to start editor '%s'", editor);
  50
  51                 sigchain_push(SIGINT, SIG_IGN);
  52                 sigchain_push(SIGQUIT, SIG_IGN);
  53                 ret = finish_command(&p);
  54                 sig = ret - 128;
  55                 sigchain_pop(SIGINT);
  56                 sigchain_pop(SIGQUIT);
  57                 if (sig == SIGINT || sig == SIGQUIT)
  58                         raise(sig);
  59                 if (ret)
  60                         return error("There was a problem with the editor '%s'.",
  61                                         editor);
  62         }
  63
  64         if (!buffer)
  65                 return 0;
  66         if (strbuf_read_file(buffer, path, 0) < 0)
  67                 return error("could not read file '%s': %s",
  68                                 path, strerror(errno));
  69         return 0;
  70 }