Move launch_editor() from builtin-tag.c to editor.c

[git.git] / editor.c

diff --git a/editor.c b/editor.c
new file mode 100644 (file)
index 0000000..483b62d
--- /dev/null
+++ b/editor.c
@@ -0,0 +1,56 @@
+#include "cache.h"
+#include "strbuf.h"
+#include "run-command.h"
+
+void launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
+{
+       const char *editor, *terminal;
+
+       editor = getenv("GIT_EDITOR");
+       if (!editor && editor_program)
+               editor = editor_program;
+       if (!editor)
+               editor = getenv("VISUAL");
+       if (!editor)
+               editor = getenv("EDITOR");
+
+       terminal = getenv("TERM");
+       if (!editor && (!terminal || !strcmp(terminal, "dumb"))) {
+               fprintf(stderr,
+               "Terminal is dumb but no VISUAL nor EDITOR defined.\n"
+               "Please supply the message using either -m or -F option.\n");
+               exit(1);
+       }
+
+       if (!editor)
+               editor = "vi";
+
+       if (strcmp(editor, ":")) {
+               size_t len = strlen(editor);
+               int i = 0;
+               const char *args[6];
+               struct strbuf arg0;
+
+               strbuf_init(&arg0, 0);
+               if (strcspn(editor, "$ \t'") != len) {
+                       /* there are specials */
+                       strbuf_addf(&arg0, "%s \"$@\"", editor);
+                       args[i++] = "sh";
+                       args[i++] = "-c";
+                       args[i++] = arg0.buf;
+               }
+               args[i++] = editor;
+               args[i++] = path;
+               args[i] = NULL;
+
+               if (run_command_v_opt_cd_env(args, 0, NULL, env))
+                       die("There was a problem with the editor %s.", editor);
+               strbuf_release(&arg0);
+       }
+
+       if (!buffer)
+               return;
+       if (strbuf_read_file(buffer, path, 0) < 0)
+               die("could not read message file '%s': %s",
+                   path, strerror(errno));
+}