term: move the term core to subprojects/term

The core now builds, tests, and benchmarks alone, as a Meson subproject
with no dependency on the main tree.

- include/term/ holds term.h and the header-only unicode/. src/ holds
  the core and its private headers. The main tree gets only
  include/term through term_dep, so it cannot reach a private header.
- The term tests, the term benchmarks, the Kitty parser suite, and
  tools/amalgamate.py and tools/generate_unicode.py move with it. The
  tests run as term:<name>.
- The main build passes its -march (arch_flag) and b_ndebug to the
  subproject. A directory configured before this commit needs
  meson configure -Dterm:arch_flag=-march=... once.
- The term tests compile with -UNDEBUG. They do work inside assert.
- The subproject exports term_test_dep with term_api.h, for the main
  tree's render, thumbnail, color, and selection tests.
- The Kitty bridge used struct vector2i and has not compiled since the
  public API redesign. It builds again. 2 of its 14 tests fail: REP
  after a tab, and a cursor report after a resize.
- dirgraph.py drops the term and unicode layers. Its self-test uses pty.
- The symbols test ignores the __odr_asan symbols that ASan adds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/include/term/unicode/width.h b/include/term/unicode/width.h
new file mode 100644
index 0000000..fc639c8
--- /dev/null
+++ b/include/term/unicode/width.h
@@ -0,0 +1,55 @@
+#ifndef TERM_UNICODE_WIDTH_H
+#define TERM_UNICODE_WIDTH_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+struct unicode_range { uint32_t lo, hi; };
+
+#include "unicode_data.inc"
+
+static inline bool in_ranges(const struct unicode_range *ranges, size_t count, uint32_t cp)
+{
+    size_t lo = 0, hi = count;
+    while (lo < hi) {
+        size_t mid = lo + (hi - lo) / 2;
+        if (cp < ranges[mid].lo)
+            hi = mid;
+        else if (cp > ranges[mid].hi)
+            lo = mid + 1;
+        else
+            return true;
+    }
+    return false;
+}
+
+#define IN_TABLE(table, cp) in_ranges(table, sizeof(table) / sizeof(table[0]), cp)
+
+static inline int unicode_width(uint32_t cp)
+{
+    if (cp > 0x10FFFF || IN_TABLE(nonprintable, cp))
+        return -1;
+    if (IN_TABLE(zero_width, cp))
+        return 0;
+    return IN_TABLE(wide, cp) ? 2 : 1;
+}
+
+static inline bool unicode_extended_pictographic(uint32_t cp)
+{
+    return IN_TABLE(extended_pictographic, cp);
+}
+
+static inline bool unicode_emoji_presentation(uint32_t cp)
+{
+    return IN_TABLE(emoji_presentation, cp);
+}
+
+static inline bool unicode_spacing_mark(uint32_t cp)
+{
+    return IN_TABLE(spacing_mark, cp);
+}
+
+#undef IN_TABLE
+
+#endif