ddidderr
d13dcc8a7f
Adds tools/difftest: a Zig driver built against a copy of Ghostty 1.3.1's own src/terminal (Zig 0.15.2, set up under target/ by tools/difftest/setup.sh) and a Rust twin on ghostty-terminal, both printing a canonical dump of every scrollback/active row (cells, graphemes, styles, hyperlinks, row flags), cursor, modes, regions, tabstops and colors. A seeded generator produces escape-heavy streams (UTF-8/wide/combining/emoji, C0, CSI with edge params, SGR, modes, ESC, OSC, DCS, margins, insert/delete); `just difftest` runs it with Zig assertions on (ReleaseSafe vs debug Rust) and off (ReleaseFast vs production Rust), with minimizers and a triage script. Divergences found and fixed in Rust (each with a regression test): - ill-formed UTF-8 decoding follows the SIMD path a default Ghostty build uses (not Zig's scalar fallback) - PageList::erase_rows keeps Zig's row-flag behavior on regrow - grapheme move on wrap with left/right margins uses the original cell Upstream bugs found and deliberately NOT replicated (per the project rule): a stale cell pointer after page growth in Terminal.zig:482/539 that drops a grapheme, plus several Zig assertion failures/segfaults; documented with minimized repros in docs/rewrite/notes/difftest-DF.md. Final run: 390k cases across many geometries, 0 divergences (Zig-abort cases, ~0.1-0.5%, are not compared). Test Plan: - just difftest 20000 "1 2 3" - cargo test -p ghostty-terminal (regression tests)
18 lines
595 B
Zig
18 lines
595 B
Zig
const std = @import("std");
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pub fn build(b: *std.Build) void {
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const target = b.standardTargetOptions(.{});
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const optimize = b.standardOptimizeOption(.{});
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const exe_mod = b.createModule(.{
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.root_source_file = b.path("src/main.zig"),
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.target = target,
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.optimize = optimize,
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});
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if (b.lazyDependency("ghostty", .{ .simd = true, .optimize = optimize })) |dep| {
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exe_mod.addImport("ghostty-vt", dep.module("ghostty-vt"));
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}
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const exe = b.addExecutable(.{ .name = "difftest_zig", .root_module = exe_mod });
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b.installArtifact(exe);
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}
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