show line containing usage

3 files changed, 70 insertions, 4 deletions

diff --git a/ide-usages.c b/ide-usages.c
index 73fb725..70a44f1 100644
--- a/ide-usages.c
+++ b/ide-usages.c
@@ -37,14 +37,79 @@ void usages_process_lsp_response(Ted *ted, LSPResponse *response) {
 		TextBuffer *buffer = &ted->build_buffer;
 		build_setup_buffer(ted);
 		ted->build_shown = true;
+		char last_path[TED_PATH_MAX] = {0};
+		TextBuffer *last_buffer = NULL;
+		FILE *last_file = NULL;
+		u32 last_line = 0;
+		
 		arr_foreach_ptr(refs->locations, LSPLocation, location) {
+			const char *path = lsp_document_path(lsp, location->document);
+			
+			if (!paths_eq(path, last_path)) {
+				// it's a new file!
+				strbuf_cpy(last_path, path);
+				if (last_file) {
+					fclose(last_file);
+					last_file = NULL;
+				}
+				last_buffer = ted_get_buffer_with_file(ted, path);
+				if (!last_buffer) {
+					last_file = fopen(path, "rb");
+					last_line = 0;
+				}
+			}
+			
+			u32 line = location->range.start.line;
+			
+			char *line_text = NULL;
+			if (last_buffer) {
+				// read the line from the buffer
+				if (line < last_buffer->nlines) {
+					BufferPos pos = {.line = line, .index = 0};
+					line_text = buffer_get_utf8_text_at_pos(last_buffer, pos, last_buffer->lines[line].len);
+				}
+			} else if (last_file) {
+				// read the line from the file
+				while (last_line < line) {
+					int c = getc(last_file);
+					if (c == '\n') ++last_line;
+					if (c == EOF) {
+						fclose(last_file);
+						last_file = NULL;
+						break;
+					}
+				}
+				
+				line_text = calloc(1, 1024);
+				if (last_file && last_line == line) {
+					char *p = line_text;
+					for (u32 i = 0; i < 1023; ++i, ++p) {
+						int c = getc(last_file);
+						if (c == '\n') {
+							++last_line;
+							break;
+						}
+						if (c == EOF) {
+							fclose(last_file);
+							last_file = NULL;
+							break;
+						}
+						line_text[i] = (char)c;
+					}
+				}
+			}
+			
 			char text[1024];
-			strbuf_printf(text, "%s:%u: \n",
-				lsp_document_path(lsp, location->document),
-				location->range.start.line + 1);
+			strbuf_printf(text, "%s:%u: %s\n",
+				path,
+				line + 1,
+				line_text ? line_text + strspn(line_text, "\t ") : "");
+			free(line_text);
 			buffer_insert_utf8_at_cursor(buffer, text);
 			buffer_cursor_move_to_end_of_file(buffer);
 		}
+		if (last_file)
+			fclose(last_file);
 		buffer->view_only = true;
 		
 		// the build_dir doesn't really matter since we're using absolute paths
diff --git a/lsp-parse.c b/lsp-parse.c
index cf590d3..5a1da29 100644
--- a/lsp-parse.c
+++ b/lsp-parse.c
@@ -799,6 +799,8 @@ static bool parse_highlight(LSP *lsp, const JSON *json, LSPResponse *response) {
 }
 
 static int references_location_cmp(void *context, const void *av, const void *bv) {
+	// IMPORTANT: don't change this comparison function.
+	// it matters in ide-usages.c
 	LSP *lsp = context;
 	const LSPLocation *a = av, *b = bv;
 	const char *a_path = lsp_document_path(lsp, a->document);
diff --git a/main.c b/main.c
index 5576227..c2e4904 100644
--- a/main.c
+++ b/main.c
@@ -1,6 +1,5 @@
 /*
 @TODO:
-- show line containing usage
 - hover-auto
 - handle multiple symbols with same name in go-to-definition menu
 - :go-to-cursor-definition