TUI: mouse drag selection with OSC 52 copy; Markdown emphasis follows CommonMark; v0.5.0

- Drag, double-click (word) and triple-click (line) selection in the log, auto-scroll at the edges, soft-wrapped lines joined on copy. - sashidown ANSI renderer: delimiter runs with flanking rules, so intraword underscores (test_apply_patch.c) stay literal; unmatched * _ and backticks are shown as-is; * and _ do not close each other. - tests: test_textsel, test_markdown.
2026-10-06 14:24:42 +08:00
parent b28bca2cfc
commit 1c26cc6e30
11 changed files with 875 additions and 111 deletions
@@ -0,0 +1,112 @@
+#include "cst_textsel.h"
+
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CHECK(c)                                                               \
+  do {                                                                         \
+    if (!(c)) {                                                                \
+      fprintf(stderr, "%s:%d: CHECK(%s) failed\n", __FILE__, __LINE__, #c);   \
+      exit(1);                                                                 \
+    }                                                                          \
+  } while (0)
+
+static char got[512];
+
+static const char *slice(const char *line, int indent, int c1, int c2,
+                         int trim) {
+  cst_selbuf_t b = {0};
+  CHECK(cst_textsel_append(&b, line, indent, c1, c2, trim) == 0);
+  snprintf(got, sizeof(got), "%s", b.s ? b.s : "");
+  cst_selbuf_free(&b);
+  return got;
+}
+
+static void test_ascii(void) {
+  CHECK(strcmp(slice("hello world", 0, 0, 4, 1), "hello") == 0);
+  CHECK(strcmp(slice("hello world", 0, 6, -1, 1), "world") == 0);
+  CHECK(strcmp(slice("hello world", 0, 3, 7, 1), "lo wo") == 0);
+  /* indent: columns before the content are blank */
+  CHECK(strcmp(slice("abc", 2, 0, 2, 1), "a") == 0);
+  CHECK(strcmp(slice("abc", 2, 0, 1, 1), "") == 0);
+  /* trailing spaces */
+  CHECK(strcmp(slice("ab   ", 0, 0, -1, 1), "ab") == 0);
+  CHECK(strcmp(slice("ab   ", 0, 0, -1, 0), "ab   ") == 0);
+  /* beyond the end of the content */
+  CHECK(strcmp(slice("ab", 0, 5, 9, 1), "") == 0);
+}
+
+static void test_ansi(void) {
+  const char *s = "\033[1;31mred\033[0m and \033[32mgreen\033[0m";
+  CHECK(strcmp(slice(s, 0, 0, -1, 1), "red and green") == 0);
+  CHECK(strcmp(slice(s, 0, 4, 6, 1), "and") == 0);
+  CHECK(strcmp(slice(s, 0, 8, 12, 1), "green") == 0);
+  int c1, c2;
+  cst_textsel_word(s, 0, 10, &c1, &c2);
+  CHECK(c1 == 8 && c2 == 12);
+}
+
+static void test_words(void) {
+  const char *s = "  open src/tui.c:42 now";
+  int c1, c2;
+  cst_textsel_word(s, 0, 9, &c1, &c2);
+  CHECK(c1 == 7 && c2 == 18);
+  CHECK(strcmp(slice(s, 0, c1, c2, 1), "src/tui.c:42") == 0);
+  cst_textsel_word(s, 0, 6, &c1, &c2); /* on a space */
+  CHECK(c1 == 6 && c2 == 6);
+  cst_textsel_word(s, 0, 40, &c1, &c2); /* past the end */
+  CHECK(c1 == 40 && c2 == 40);
+  cst_textsel_word(s, 1, 3, &c1, &c2); /* indent shifts columns */
+  CHECK(c1 == 3 && c2 == 6);
+}
+
+static void test_wide(void) {
+  /* 中文 occupies columns 0-1 and 2-3 */
+  const char *s = "中文 ok";
+  CHECK(strcmp(slice(s, 0, 1, 1, 1), "中") == 0);
+  CHECK(strcmp(slice(s, 0, 1, 2, 1), "中文") == 0);
+  CHECK(strcmp(slice(s, 0, 3, 6, 1), "文 ok") == 0);
+  int c1, c2;
+  cst_textsel_word(s, 0, 3, &c1, &c2);
+  CHECK(c1 == 0 && c2 == 3);
+  cst_textsel_word("「x」", 0, 1, &c1, &c2); /* wide punctuation */
+  CHECK(c1 == 0 && c2 == 1);
+  /* highlight edges never split a wide character */
+  c1 = 1, c2 = 2;
+  cst_textsel_snap(s, 0, &c1, &c2);
+  CHECK(c1 == 0 && c2 == 3);
+  c1 = 2, c2 = 5;
+  cst_textsel_snap(s, 0, &c1, &c2);
+  CHECK(c1 == 2 && c2 == 5);
+  c1 = 3, c2 = -1;
+  cst_textsel_snap(s, 1, &c1, &c2); /* indent 1: 中 at 1-2, 文 at 3-4 */
+  CHECK(c1 == 3 && c2 == -1);
+  c1 = 4, c2 = 1;
+  cst_textsel_snap(s, 1, &c1, &c2);
+  CHECK(c1 == 3 && c2 == 2);
+}
+
+static void test_join(void) {
+  cst_selbuf_t b = {0};
+  CHECK(cst_textsel_append(&b, "first line  ", 0, 6, -1, 1) == 0);
+  CHECK(cst_selbuf_putc(&b, '\n') == 0);
+  CHECK(cst_textsel_append(&b, "second", 2, 0, 4, 1) == 0);
+  CHECK(strcmp(b.s, "line\nsec") == 0);
+  cst_selbuf_free(&b);
+  CHECK(b.s == NULL && b.n == 0);
+}
+
+int main(void) {
+  test_ascii();
+  test_ansi();
+  test_words();
+  if (setlocale(LC_CTYPE, "C.UTF-8") || setlocale(LC_CTYPE, "en_US.UTF-8"))
+    test_wide();
+  else
+    printf("test_textsel: no UTF-8 locale, wide-character checks skipped\n");
+  test_join();
+  printf("test_textsel: ok\n");
+  return 0;
+}