Fix parsing of `git ls-tree` for submodules

Closes #1282

3 files changed, 41 insertions, 22 deletions

diff --git a/NEWS.adoc b/NEWS.adoc
index 6a8b03c4..9fbc0461 100644
--- a/NEWS.adoc
+++ b/NEWS.adoc
@@ -33,6 +33,7 @@ Bug fixes:
  - Fix status view lockup.
  - Fix untracked changes and chunk staging behaviour in plain stage view.
  - Reset state variables when selecting a commit with no reference.
+ - Fix parsing of `git ls-tree` for submodules. (#1282)
 
 tig-2.5.8
 ---------
diff --git a/src/draw.c b/src/draw.c
index a9ded13e..c2befa47 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -276,11 +276,10 @@ draw_id(struct view *view, struct view_column *column, const char *id)
 }
 
 static bool
-draw_filename(struct view *view, struct view_column *column, const char *filename, mode_t mode)
+draw_filename(struct view *view, struct view_column *column, enum line_type type, const char *filename)
 {
 	size_t width = filename ? utf8_width(filename) : 0;
 	bool trim = width >= column->width;
-	enum line_type type = S_ISDIR(mode) ? LINE_DIRECTORY : LINE_FILE;
 	int column_width = column->width ? column->width : width;
 
 	if (column->opt.file_name.display == FILENAME_NO)
@@ -290,9 +289,9 @@ draw_filename(struct view *view, struct view_column *column, const char *filenam
 }
 
 static bool
-draw_file_size(struct view *view, struct view_column *column, unsigned long size, mode_t mode)
+draw_file_size(struct view *view, struct view_column *column, enum line_type type, unsigned long size)
 {
-	const char *str = S_ISDIR(mode) ? NULL : mkfilesize(size, column->opt.file_size.display);
+	const char *str = type == LINE_FILE ? mkfilesize(size, column->opt.file_size.display) : NULL;
 
 	if (!column->width || column->opt.file_size.display == FILE_SIZE_NO)
 		return false;
@@ -518,7 +517,7 @@ view_column_draw(struct view *view, struct line *line, unsigned int lineno)
 			continue;
 
 		case VIEW_COLUMN_FILE_SIZE:
-			if (draw_file_size(view, column, column_data.file_size ? *column_data.file_size : 0, mode))
+			if (draw_file_size(view, column, line->type, column_data.file_size ? *column_data.file_size : 0))
 				return true;
 			continue;
 
@@ -529,7 +528,7 @@ view_column_draw(struct view *view, struct line *line, unsigned int lineno)
 			continue;
 
 		case VIEW_COLUMN_FILE_NAME:
-			if (draw_filename(view, column, column_data.file_name, mode))
+			if (draw_filename(view, column, line->type, column_data.file_name))
 				return true;
 			continue;
 
diff --git a/src/tree.c b/src/tree.c
index 7dc894d9..e6c826f1 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -57,15 +57,6 @@ push_tree_stack_entry(struct view *view, const char *name, struct position *posi
  * 100644 blob 95925677ca47beb0b8cce7c0e0011bcc3f61470f  213045	tig.c
  */
 
-#define SIZEOF_TREE_ATTR \
-	STRING_SIZE("100644 blob f931e1d229c3e185caad4449bf5b66ed72462657\t")
-
-#define SIZEOF_TREE_MODE \
-	STRING_SIZE("100644 ")
-
-#define TREE_ID_OFFSET \
-	STRING_SIZE("100644 blob ")
-
 #define tree_path_is_parent(path)	(!strcmp("..", (path)))
 
 struct tree_entry {
@@ -222,21 +213,50 @@ tree_read(struct view *view, struct buffer *buf, bool force_stop)
 	struct tree_entry *data;
 	struct line *entry, *line;
 	enum line_type type;
+	char *pos;
+	char *mode;
+	char *id;
 	char *path;
 	size_t size;
 
 	if (state->read_date || !buf)
 		return tree_read_date(view, buf, state);
 
-	if (buf->size <= SIZEOF_TREE_ATTR)
-		return false;
 	if (view->lines == 0 &&
 	    !tree_entry(view, LINE_HEADER, view->env->directory, NULL, NULL, 0))
 		return false;
 
-	size = parse_size(buf->data + SIZEOF_TREE_ATTR);
-	path = strchr(buf->data + SIZEOF_TREE_ATTR, '\t');
-	if (!path)
+	/* 100644 */
+	mode = buf->data;
+
+	/* blob */
+	pos = strchr(mode, ' ');
+	if (!pos || !*pos)
+		return false;
+	pos++;
+	if (!strncmp(pos, "blob", STRING_SIZE("blob")))
+		type = LINE_FILE;
+	else if (!strncmp(pos, "tree", STRING_SIZE("tree")))
+		type = LINE_DIRECTORY;
+	else
+		type = LINE_DEFAULT;
+
+	/* 95925677ca47beb0b8cce7c0e0011bcc3f61470f */
+	id = strchr(pos, ' ');
+	if (!id || !*id)
+		return false;
+	id++;
+
+	/* 213045 */
+	pos = strchr(id, ' ');
+	if (!pos || !*pos)
+		return false;
+	pos++;
+	size = parse_size(pos);
+
+	/* tig.c */
+	path = strchr(pos, '\t');
+	if (!path || !*path)
 		return false;
 	path++;
 
@@ -255,8 +275,7 @@ tree_read(struct view *view, struct buffer *buf, bool force_stop)
 			return false;
 	}
 
-	type = buf->data[SIZEOF_TREE_MODE] == 't' ? LINE_DIRECTORY : LINE_FILE;
-	entry = tree_entry(view, type, path, buf->data, buf->data + TREE_ID_OFFSET, size);
+	entry = tree_entry(view, type, path, mode, id, size);
 	if (!entry)
 		return false;
 	data = entry->data;