Add `-target:<string>` fuzzy checking with "Did you mean" message

1 files changed, 26 insertions, 0 deletions

diff --git a/src/main.cpp b/src/main.cpp
index ea370a03f..d1c549b0f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -992,7 +992,33 @@ bool parse_build_flags(Array<String> args) {
 							}
 
 							if (!found) {
+								struct DistanceAndTarget {
+									isize distance;
+									isize target_index;
+								};
+								DistanceAndTarget distances[gb_count_of(named_targets)] = {};
+								for (isize i = 0; i < gb_count_of(named_targets); i++) {
+									distances[i].target_index = i;
+									distances[i].distance = levenstein_distance_case_insensitive(str, named_targets[i].name);
+								}
+								gb_sort_array(distances, gb_count_of(distances), gb_isize_cmp(gb_offset_of(DistanceAndTarget, distance)));
+
 								gb_printf_err("Unknown target '%.*s'\n", LIT(str));
+
+								enum {MAX_SMALLEST_DISTANCE = 3};
+								if (distances[0].distance <= MAX_SMALLEST_DISTANCE) {
+									gb_printf_err("Did you mean:\n");
+									for (isize i = 0; i < gb_count_of(named_targets); i++) {
+										if (distances[i].distance > MAX_SMALLEST_DISTANCE) {
+											break;
+										}
+										gb_printf_err("\t%.*s\n", LIT(named_targets[distances[i].target_index].name));
+									}
+								}
+								gb_printf_err("All supported targets:\n");
+								for (isize i = 0; i < gb_count_of(named_targets); i++) {
+									gb_printf_err("\t%.*s\n", LIT(named_targets[i].name));
+								}
 								bad_flags = true;
 							}