Added support for move to parent in main view.

include/tig/view.h

@@ -396,6 +396,7 @@ struct line *add_line_text(struct view *view, const char *text, enum line_type t
 struct line *add_line_text_at(struct view *view, unsigned long pos, const char *text, enum line_type type, size_t cells);
 struct line * PRINTF_LIKE(3, 4) add_line_format(struct view *view, enum line_type type, const char *fmt, ...);
 bool append_line_format(struct view *view, struct line *line, const char *fmt, ...);
+enum status_code read_hash(char *id, size_t idlen, char *s2, size_t n2, void *data);
 
 #endif
 /* vim: set ts=8 sw=8 noexpandtab: */

src/tig.c

@@ -266,7 +266,11 @@ view_driver(struct view *view, enum request request)
 		break;
 
 	case REQ_PARENT:
-		report("Moving to parent is not supported by the %s view", view->name);
+		if (! strcmp(view->name, "main")) {
+			move_view(view, request);
+		} else {
+			report("Moving to parent is not supported by the %s view", view->name);
+		}
 		break;
 
 	case REQ_BACK:

src/view.c

@@ -12,6 +12,7 @@
  */
 
 #include "tig/tig.h"
+#include "tig/main.h"
 #include "tig/argv.h"
 #include "tig/repo.h"
 #include "tig/watch.h"
@@ -171,6 +172,12 @@ move_view(struct view *view, enum request request)
 {
 	int scroll_steps = 0;
 	int steps;
+	struct commit *commit = view->line[view->pos.lineno].data;
+
+	char current_hash[SIZEOF_REV + 1] = "";
+	char parent_hash[SIZEOF_REV] = "";
+	static const char *rev_list_parents_argv[] = { "git", "rev-list", "-n1", NULL, NULL };
+	rev_list_parents_argv[3] = current_hash;
 
 	switch (request) {
 	case REQ_MOVE_FIRST_LINE:
@@ -211,6 +218,31 @@ move_view(struct view *view, enum request request)
 		steps = 1;
 		break;
 
+	case REQ_PARENT:
+		string_copy_rev(current_hash, commit->id);
+
+		//can't assume the hash takes the full 41 bytes
+		size_t n = strlen(commit->id);
+		current_hash[n] = '~';
+		current_hash[n + 1] = 0;
+		int i;
+
+		if(io_run_load(rev_list_parents_argv, " ", read_hash, parent_hash) != SUCCESS || !strlen(parent_hash)) {
+			report("Unable to locate parent.");
+			return;
+		}
+
+		for (i = 0; i < view->lines; i++) {
+			struct commit *commit = view->line[i].data;
+
+			if (!strncasecmp(commit->id, parent_hash, strlen(parent_hash))) {
+				steps = i - view->pos.lineno;
+				break;
+			}
+		}
+
+		break;
+
 	default:
 		die("request %d not handled in switch", request);
 	}
@@ -1610,6 +1642,16 @@ append_line_format(struct view *view, struct line *line, const char *fmt, ...)
 	return true;
 }
 
+enum status_code read_hash(char *id, size_t idlen, char *s2, size_t s2len, void *data) {
+	char *result = data;
+
+	if (! result[0] && idlen > 0) {
+		string_copy_rev(result, id);
+	}
+
+	return SUCCESS;
+}
+
 /*
  * Global view state.
  */