editor.c

   1 #include "cache.h"
   2 #include "config.h"
   3 #include "strbuf.h"
   4 #include "run-command.h"
   5 #include "sigchain.h"
   6
   7 #ifndef DEFAULT_EDITOR
   8 #define DEFAULT_EDITOR "vi"
   9 #endif
  10
  11 int is_terminal_dumb(void)
  12 {
  13         const char *terminal = getenv("TERM");
  14         return !terminal || !strcmp(terminal, "dumb");
  15 }
  16
  17 const char *git_editor(void)
  18 {
  19         const char *editor = getenv("GIT_EDITOR");
  20         int terminal_is_dumb = is_terminal_dumb();
  21
  22         if (!editor && editor_program)
  23                 editor = editor_program;
  24         if (!editor && !terminal_is_dumb)
  25                 editor = getenv("VISUAL");
  26         if (!editor)
  27                 editor = getenv("EDITOR");
  28
  29         if (!editor && terminal_is_dumb)
  30                 return NULL;
  31
  32         if (!editor)
  33                 editor = DEFAULT_EDITOR;
  34
  35         return editor;
  36 }
  37
  38 const char *git_sequence_editor(void)
  39 {
  40         const char *editor = getenv("GIT_SEQUENCE_EDITOR");
  41
  42         if (!editor)
  43                 git_config_get_string_const("sequence.editor", &editor);
  44         if (!editor)
  45                 editor = git_editor();
  46
  47         return editor;
  48 }
  49
  50 static int launch_specified_editor(const char *editor, const char *path,
  51                                    struct strbuf *buffer, const char *const *env)
  52 {
  53         if (!editor)
  54                 return error("Terminal is dumb, but EDITOR unset");
  55
  56         if (strcmp(editor, ":")) {
  57                 struct strbuf realpath = STRBUF_INIT;
  58                 const char *args[] = { editor, NULL, NULL };
  59                 struct child_process p = CHILD_PROCESS_INIT;
  60                 int ret, sig;
  61                 int print_waiting_for_editor = advice_waiting_for_editor && isatty(2);
  62
  63                 if (print_waiting_for_editor) {
  64                         /*
  65                          * A dumb terminal cannot erase the line later on. Add a
  66                          * newline to separate the hint from subsequent output.
  67                          *
  68                          * Make sure that our message is separated with a whitespace
  69                          * from further cruft that may be written by the editor.
  70                          */
  71                         const char term = is_terminal_dumb() ? '\n' : ' ';
  72
  73                         fprintf(stderr,
  74                                 _("hint: Waiting for your editor to close the file...%c"),
  75                                 term);
  76                         fflush(stderr);
  77                 }
  78
  79                 strbuf_realpath(&realpath, path, 1);
  80                 args[1] = realpath.buf;
  81
  82                 p.argv = args;
  83                 p.env = env;
  84                 p.use_shell = 1;
  85                 p.trace2_child_class = "editor";
  86                 if (start_command(&p) < 0) {
  87                         strbuf_release(&realpath);
  88                         return error("unable to start editor '%s'", editor);
  89                 }
  90
  91                 sigchain_push(SIGINT, SIG_IGN);
  92                 sigchain_push(SIGQUIT, SIG_IGN);
  93                 ret = finish_command(&p);
  94                 strbuf_release(&realpath);
  95                 sig = ret - 128;
  96                 sigchain_pop(SIGINT);
  97                 sigchain_pop(SIGQUIT);
  98                 if (sig == SIGINT || sig == SIGQUIT)
  99                         raise(sig);
 100                 if (ret)
 101                         return error("There was a problem with the editor '%s'.",
 102                                         editor);
 103
 104                 if (print_waiting_for_editor && !is_terminal_dumb())
 105                         /*
 106                          * Erase the entire line to avoid wasting the
 107                          * vertical space.
 108                          */
 109                         term_clear_line();
 110         }
 111
 112         if (!buffer)
 113                 return 0;
 114         if (strbuf_read_file(buffer, path, 0) < 0)
 115                 return error_errno("could not read file '%s'", path);
 116         return 0;
 117 }
 118
 119 int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
 120 {
 121         return launch_specified_editor(git_editor(), path, buffer, env);
 122 }
 123
 124 int launch_sequence_editor(const char *path, struct strbuf *buffer,
 125                            const char *const *env)
 126 {
 127         return launch_specified_editor(git_sequence_editor(), path, buffer, env);
 128 }