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Commite2deed6d

e2deed6dgitoria#20: "Add code" only on the Code page of an empty repository, no collapsiblemre2026-09-27 14:59

e2deed6d/plugins/fs/fs.zig

40.4 KB

// hl:fs plugin — native shared library
// Compiled to fs.so, loaded by runtime via dlopen
//
// Exports:
// hl_fs_file(path) → file descriptor with metadata + line iterator
// hl_fs_read_file(path) → entire file as string (raw bytes, unchecked)
// hl_fs_write_file(path, text, mode?) / hl_fs_write_file_hex(path, hex, mode?)
// hl_fs_list_dir(path) → streaming directory iterator
const std = @import("std");
const api = @import("plugin_api");
const linux = std.os.linux;
const HlValue = api.HlValue;
const HlObject = api.HlObject;
const HlField = api.HlField;
const HlIterator = api.HlIterator;
const HlString = api.HlString;
// stack_trace_frames = 0 (mission 068): plugin code runs on interpreter FIBER
// stacks; Debug trace capture unwinds off them and segfaults.
var gpa = std.heap.DebugAllocator(.{ .stack_trace_frames = 0 }){};
const allocator = gpa.allocator();
// =========================================================================
// Path resolution (mission 068)
//
// CONTRACT: relative paths passed to hl:fs resolve against the MAIN SCRIPT's
// directory, not the process CWD — Hybriel path resolution is file-relative
// everywhere (import, inherit, plugin discovery), and fs follows suit.
// Absolute paths are used as-is. The runtime injects the script dir via the
// optional plugin hook hl_fs_set_script_dir right after dlopen.
// =========================================================================
var script_dir: ?[]u8 = null;
export fn hl_fs_set_script_dir(ptr: [*]const u8, len: usize) callconv(.c) void {
if (script_dir) |old| allocator.free(old);
script_dir = allocator.dupe(u8, ptr[0..len]) catch null;
}
/// Resolve a (possibly relative) path against the script dir. Returned slice
/// is allocated with the plugin allocator; caller frees.
fn resolvePath(path: []const u8) ?[]u8 {
if (path.len == 0) return allocator.dupe(u8, path) catch null;
if (path[0] == '/') return allocator.dupe(u8, path) catch null;
if (script_dir) |sd| {
return std.fmt.allocPrint(allocator, "{s}/{s}", .{ sd, path }) catch null;
}
return allocator.dupe(u8, path) catch null;
}
// =========================================================================
// Error values (mission 068): open failures are LOUD — api.makeError with
// the operation, the path as the caller wrote it, and the OS reason. The
// runtime turns a top-level error value into a located runtime error.
// =========================================================================
fn errnoText(errno: usize) []const u8 {
return switch (errno) {
2 => "no such file or directory",
13 => "permission denied",
20 => "not a directory",
21 => "is a directory",
else => "I/O error",
};
}
fn errDeinit(val: *api.HlValue) callconv(.c) void {
if (val.type == .hl_error) {
const s = val.data.string;
allocator.free(@constCast(s.ptr[0..s.len]));
}
}
fn makeOpenError(op: []const u8, path: []const u8, errno: usize) api.HlValue {
const msg = std.fmt.allocPrint(allocator, "{s}: cannot open '{s}' — {s} (errno {d}); relative paths resolve against the script's directory", .{ op, path, errnoText(errno), errno }) catch
return api.makeError("fs: cannot open file");
var v = api.makeError(msg);
v.deinit_fn = &errDeinit;
return v;
}
// =========================================================================
// hl_fs_file — file descriptor with metadata + line iterator
// =========================================================================
const FileIterState = struct {
fd: i32,
allocated_strings: std.array_list.Managed([]u8),
done: bool,
buf: [4096]u8,
buf_pos: usize,
buf_len: usize,
};
export fn hl_fs_file(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeError("fs.file expects a string path");
const path_str = argv[0].data.string;
const path = path_str.ptr[0..path_str.len];
// Resolve relative paths against the script dir; keep the caller's path
// for the descriptor's name/path fields.
const resolved = resolvePath(path) orelse return api.makeNull();
defer allocator.free(resolved);
// We need a null-terminated path for the OS
const path_z = allocator.dupeZ(u8, resolved) catch return api.makeNull();
defer allocator.free(path_z);
// Open file
const rc = linuxOpenRc(path_z, .{}, 0);
if (rc < 0) return makeOpenError("fs.file", path, @intCast(-rc));
const fd: i32 = @intCast(rc);
// Stat for size, chmod, uid, gid
var size: f64 = 0;
var chmod: f64 = 0;
var uid: f64 = 0;
var gid: f64 = 0;
var stat_ok = false;
var statx_buf: std.os.linux.Statx = undefined;
const statx_rc = std.os.linux.statx(
fd,
"",
std.os.linux.AT.EMPTY_PATH,
std.os.linux.STATX.BASIC_STATS,
&statx_buf,
);
if (statx_rc == 0) {
size = @floatFromInt(statx_buf.size);
chmod = @floatFromInt(statx_buf.mode & 0o7777);
uid = @floatFromInt(statx_buf.uid);
gid = @floatFromInt(statx_buf.gid);
stat_ok = true;
}
// Extract name from path
const name = if (std.mem.lastIndexOfScalar(u8, path, '/')) |idx|
path[idx + 1 ..]
else
path;
// Mime from extension
const mime = mimeFromName(name);
// Build fields: name, path, size, mime, chmod, user, group = 7 fields
const field_count: usize = 7;
const fields = allocator.alloc(HlField, field_count) catch return api.makeNull();
fields[0] = .{ .key = hlStr("name"), .value = api.makeString(name) };
fields[1] = .{ .key = hlStr("path"), .value = api.makeString(path) };
fields[2] = .{ .key = hlStr("size"), .value = api.makeNumber(size) };
fields[3] = .{ .key = hlStr("mime"), .value = api.makeString(mime) };
fields[4] = .{ .key = hlStr("chmod"), .value = api.makeNumber(chmod) };
if (stat_ok) {
fields[5] = .{ .key = hlStr("user"), .value = api.makeNumber(uid) };
fields[6] = .{ .key = hlStr("group"), .value = api.makeNumber(gid) };
} else {
fields[5] = .{ .key = hlStr("user"), .value = api.makeNull() };
fields[6] = .{ .key = hlStr("group"), .value = api.makeNull() };
}
const obj = allocator.create(HlObject) catch return api.makeNull();
obj.* = .{
.fields = fields.ptr,
.field_count = field_count,
.deinit_fn = &fileObjDeinit,
};
// Create line iterator
const iter_state = allocator.create(FileIterState) catch return api.makeNull();
iter_state.* = .{
.fd = fd,
.allocated_strings = std.array_list.Managed([]u8).init(allocator),
.done = false,
.buf = undefined,
.buf_pos = 0,
.buf_len = 0,
};
const iter = allocator.create(HlIterator) catch return api.makeNull();
iter.* = .{
.context = @ptrCast(iter_state),
.next_fn = &fileIterNext,
.deinit_fn = &fileIterDeinit,
};
// Return object — runtime will see it has both object fields and an iterator
// We pack the iterator pointer into the object by adding one more field
const full_fields = allocator.alloc(HlField, field_count + 1) catch return api.makeNull();
@memcpy(full_fields[0..field_count], fields);
full_fields[field_count] = .{ .key = hlStr("__iter"), .value = api.makeIterator(iter) };
// Free the original fields, use full_fields
allocator.free(fields);
obj.fields = full_fields.ptr;
obj.field_count = field_count + 1;
return api.makeObject(obj);
}
fn fileIterNext(ctx: ?*anyopaque) callconv(.c) HlValue {
const state: *FileIterState = @ptrCast(@alignCast(ctx orelse return api.makeNull()));
if (state.done) return api.makeNull();
var line_buf = std.array_list.Managed(u8).init(allocator);
while (true) {
if (state.buf_pos < state.buf_len) {
const remaining = state.buf[state.buf_pos..state.buf_len];
if (std.mem.indexOfScalar(u8, remaining, '\n')) |nl_pos| {
line_buf.appendSlice(remaining[0..nl_pos]) catch return api.makeNull();
state.buf_pos += nl_pos + 1;
break;
} else {
line_buf.appendSlice(remaining) catch return api.makeNull();
state.buf_pos = 0;
state.buf_len = 0;
}
}
// Read from file using posix read
const n = linuxRead(state.fd, &state.buf) orelse {
state.done = true;
break;
};
if (n == 0) {
state.done = true;
break;
}
state.buf_pos = 0;
state.buf_len = n;
}
if (line_buf.items.len == 0 and state.done) {
line_buf.deinit();
return api.makeNull();
}
const line = line_buf.toOwnedSlice() catch return api.makeNull();
state.allocated_strings.append(line) catch return api.makeNull();
return api.makeString(line);
}
fn fileIterDeinit(ctx: ?*anyopaque) callconv(.c) void {
const state: *FileIterState = @ptrCast(@alignCast(ctx orelse return));
_ = linux.close(state.fd);
for (state.allocated_strings.items) |s| {
allocator.free(s);
}
state.allocated_strings.deinit();
allocator.destroy(state);
}
fn fileObjDeinit(obj: *HlObject) callconv(.c) void {
const fields = obj.fields[0..obj.field_count];
// Check for iterator field and clean it up (only if not already nulled out by runtime)
for (fields) |field| {
if (field.value.type == .hl_iterator) {
const iter = field.value.data.iterator;
if (iter.deinit_fn) |deinit_fn| {
deinit_fn(iter.context);
}
allocator.destroy(iter);
}
}
allocator.free(fields);
allocator.destroy(obj);
}
// =========================================================================
// hl_fs_read_file — read entire file as string
// =========================================================================
fn readFileDeinit(val: *HlValue) callconv(.c) void {
if (val.type == .hl_string) {
const s = val.data.string;
allocator.free(@constCast(s.ptr[0..s.len]));
}
}
/// exists(path) → Boolean (mission 077, 074 GAP 8). The ONLY hl:fs entry point
/// that never errors: it answers a question, and "no" is an answer, not a
/// failure. Same script-relative resolution as everything else. Without it the
/// only way to test a path was to open it and survive the error — which is why
/// the retired live_server used to index `static/` blind instead of probing it.
export fn hl_fs_exists(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeBool(false);
const path_str = argv[0].data.string;
const path = path_str.ptr[0..path_str.len];
const resolved = resolvePath(path) orelse return api.makeBool(false);
defer allocator.free(resolved);
const path_z = allocator.dupeZ(u8, resolved) catch return api.makeBool(false);
defer allocator.free(path_z);
// statx, not open: a directory, a symlink target, a device — anything the
// OS can name — counts, and nothing is opened (no fd, no side effect).
var statx_buf: std.os.linux.Statx = undefined;
const rc = std.os.linux.statx(
std.os.linux.AT.FDCWD,
path_z,
0,
std.os.linux.STATX.BASIC_STATS,
&statx_buf,
);
return api.makeBool(@as(isize, @bitCast(rc)) == 0);
}
export fn hl_fs_read_file(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeError("fs.readFile expects a string path");
const path_str = argv[0].data.string;
const path = path_str.ptr[0..path_str.len];
const resolved = resolvePath(path) orelse return api.makeNull();
defer allocator.free(resolved);
const path_z = allocator.dupeZ(u8, resolved) catch return api.makeNull();
defer allocator.free(path_z);
const rc = linuxOpenRc(path_z, .{}, 0);
if (rc < 0) return makeOpenError("fs.readFile", path, @intCast(-rc));
const fd: i32 = @intCast(rc);
defer _ = linux.close(fd);
// Read up to 10MB
var content = std.array_list.Managed(u8).init(allocator);
var buf: [4096]u8 = undefined;
var total: usize = 0;
const max_size: usize = 1024 * 1024 * 10;
while (total < max_size) {
const n = linuxRead(fd, &buf) orelse break;
if (n == 0) break;
content.appendSlice(buf[0..n]) catch return api.makeNull();
total += n;
}
const result_slice = content.toOwnedSlice() catch return api.makeNull();
var result = api.makeString(result_slice);
result.deinit_fn = &readFileDeinit;
return result;
}
// =========================================================================
// hl_fs_list_dir — streaming directory iterator with metadata
// =========================================================================
const DirIterState = struct {
fd: i32,
base_path: []const u8,
allocated_strings: std.array_list.Managed([]u8),
// Linux getdents64 buffer
dents_buf: [4096]u8,
dents_pos: usize,
dents_len: usize,
done: bool,
};
export fn hl_fs_list_dir(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeError("fs.listDir expects a string path");
const path_str = argv[0].data.string;
const path = path_str.ptr[0..path_str.len];
const resolved = resolvePath(path) orelse return api.makeNull();
defer allocator.free(resolved);
const path_z = allocator.dupeZ(u8, resolved) catch return api.makeNull();
defer allocator.free(path_z);
const rc = linuxOpenRc(path_z, .{ .DIRECTORY = true }, 0);
if (rc < 0) return makeOpenError("fs.listDir", path, @intCast(-rc));
const fd: i32 = @intCast(rc);
const path_copy = allocator.dupe(u8, path) catch return api.makeNull();
const state = allocator.create(DirIterState) catch return api.makeNull();
state.* = .{
.fd = fd,
.base_path = path_copy,
.allocated_strings = std.array_list.Managed([]u8).init(allocator),
.dents_buf = undefined,
.dents_pos = 0,
.dents_len = 0,
.done = false,
};
const iter = allocator.create(HlIterator) catch return api.makeNull();
iter.* = .{
.context = @ptrCast(state),
.next_fn = &dirIterNext,
.deinit_fn = &dirIterDeinit,
};
return api.makeIterator(iter);
}
fn dirIterNext(ctx: ?*anyopaque) callconv(.c) HlValue {
const state: *DirIterState = @ptrCast(@alignCast(ctx orelse return api.makeNull()));
if (state.done) return api.makeNull();
while (true) {
// Need more directory entries?
if (state.dents_pos >= state.dents_len) {
const rc = std.os.linux.getdents64(state.fd, &state.dents_buf, state.dents_buf.len);
if (@as(isize, @bitCast(rc)) <= 0) {
state.done = true;
return api.makeNull();
}
state.dents_len = rc;
state.dents_pos = 0;
}
// Parse next dirent64
const entry_ptr: *align(1) std.os.linux.dirent64 = @ptrCast(&state.dents_buf[state.dents_pos]);
state.dents_pos += entry_ptr.reclen;
// Get name
const name_ptr: [*]const u8 = @ptrCast(&entry_ptr.name);
const name_len = std.mem.indexOfScalar(u8, name_ptr[0..256], 0) orelse continue;
const name = name_ptr[0..name_len];
// Skip . and ..
if (std.mem.eql(u8, name, ".") or std.mem.eql(u8, name, "..")) continue;
const name_copy = allocator.dupe(u8, name) catch return api.makeNull();
state.allocated_strings.append(name_copy) catch return api.makeNull();
// Build full path
const full_path = std.fmt.allocPrint(allocator, "{s}/{s}", .{ state.base_path, name }) catch return api.makeNull();
state.allocated_strings.append(full_path) catch return api.makeNull();
// Entry type from d_type
const kind_str: []const u8 = switch (entry_ptr.type) {
std.os.linux.DT.DIR => "directory",
std.os.linux.DT.REG => "file",
std.os.linux.DT.LNK => "symlink",
else => "other",
};
// Stat for size, chmod, uid, gid
var size: f64 = 0;
var chmod: f64 = 0;
var e_uid: f64 = 0;
var e_gid: f64 = 0;
// null-terminate name for statx
var name_z_buf: [256]u8 = undefined;
if (name.len < name_z_buf.len) {
@memcpy(name_z_buf[0..name.len], name);
name_z_buf[name.len] = 0;
var statx_buf: std.os.linux.Statx = undefined;
const src = std.os.linux.statx(
state.fd,
@ptrCast(name_z_buf[0 .. name.len + 1]),
0,
std.os.linux.STATX.BASIC_STATS,
&statx_buf,
);
if (src == 0) {
size = @floatFromInt(statx_buf.size);
chmod = @floatFromInt(statx_buf.mode & 0o7777);
e_uid = @floatFromInt(statx_buf.uid);
e_gid = @floatFromInt(statx_buf.gid);
}
}
const mime = mimeFromName(name_copy);
// Build object: name, path, type, size, mime, chmod, user, group
// The runtime's hlObjectToValue will call entryObjDeinit after conversion,
// so these objects are freed immediately upon consumption.
const field_count: usize = 8;
const fields = allocator.alloc(HlField, field_count) catch return api.makeNull();
fields[0] = .{ .key = hlStr("name"), .value = api.makeString(name_copy) };
fields[1] = .{ .key = hlStr("path"), .value = api.makeString(full_path) };
fields[2] = .{ .key = hlStr("type"), .value = api.makeString(kind_str) };
fields[3] = .{ .key = hlStr("size"), .value = api.makeNumber(size) };
fields[4] = .{ .key = hlStr("mime"), .value = api.makeString(mime) };
fields[5] = .{ .key = hlStr("chmod"), .value = api.makeNumber(chmod) };
fields[6] = .{ .key = hlStr("user"), .value = api.makeNumber(e_uid) };
fields[7] = .{ .key = hlStr("group"), .value = api.makeNumber(e_gid) };
const obj = allocator.create(HlObject) catch return api.makeNull();
obj.* = .{
.fields = fields.ptr,
.field_count = field_count,
.deinit_fn = &entryObjDeinit,
};
return api.makeObject(obj);
}
}
fn entryObjDeinit(obj: *HlObject) callconv(.c) void {
allocator.free(obj.fields[0..obj.field_count]);
allocator.destroy(obj);
}
fn dirIterDeinit(ctx: ?*anyopaque) callconv(.c) void {
const state: *DirIterState = @ptrCast(@alignCast(ctx orelse return));
_ = linux.close(state.fd);
for (state.allocated_strings.items) |s| {
allocator.free(s);
}
state.allocated_strings.deinit();
allocator.free(@constCast(state.base_path));
allocator.destroy(state);
}
// =========================================================================
// Helpers
// =========================================================================
/// Raw open: >= 0 is the fd, < 0 is -errno.
fn linuxOpenRc(path_z: [*:0]const u8, flags: linux.O, mode: u32) isize {
const rc = linux.open(path_z, flags, mode);
return @bitCast(rc);
}
fn linuxRead(fd: i32, buf: []u8) ?usize {
const rc = linux.read(fd, buf.ptr, buf.len);
if (@as(isize, @bitCast(rc)) <= 0) return null;
return rc;
}
fn hlStr(comptime s: []const u8) HlString {
return .{ .ptr = s.ptr, .len = s.len };
}
fn mimeFromName(name: []const u8) []const u8 {
const ext = if (std.mem.lastIndexOfScalar(u8, name, '.')) |dot|
name[dot..]
else
return "application/octet-stream";
if (std.mem.eql(u8, ext, ".txt")) return "text/plain";
if (std.mem.eql(u8, ext, ".html") or std.mem.eql(u8, ext, ".htm")) return "text/html";
if (std.mem.eql(u8, ext, ".css")) return "text/css";
if (std.mem.eql(u8, ext, ".js")) return "text/javascript";
if (std.mem.eql(u8, ext, ".json")) return "application/json";
if (std.mem.eql(u8, ext, ".xml")) return "application/xml";
if (std.mem.eql(u8, ext, ".png")) return "image/png";
if (std.mem.eql(u8, ext, ".jpg") or std.mem.eql(u8, ext, ".jpeg")) return "image/jpeg";
if (std.mem.eql(u8, ext, ".gif")) return "image/gif";
if (std.mem.eql(u8, ext, ".svg")) return "image/svg+xml";
if (std.mem.eql(u8, ext, ".pdf")) return "application/pdf";
if (std.mem.eql(u8, ext, ".zip")) return "application/zip";
if (std.mem.eql(u8, ext, ".gz")) return "application/gzip";
if (std.mem.eql(u8, ext, ".mp3")) return "audio/mpeg";
if (std.mem.eql(u8, ext, ".mp4")) return "video/mp4";
if (std.mem.eql(u8, ext, ".wasm")) return "application/wasm";
if (std.mem.eql(u8, ext, ".hl")) return "text/x-hybriel";
if (std.mem.eql(u8, ext, ".md")) return "text/markdown";
if (std.mem.eql(u8, ext, ".yml") or std.mem.eql(u8, ext, ".yaml")) return "text/yaml";
if (std.mem.eql(u8, ext, ".toml")) return "application/toml";
if (std.mem.eql(u8, ext, ".csv")) return "text/csv";
if (std.mem.eql(u8, ext, ".ts")) return "text/typescript";
if (std.mem.eql(u8, ext, ".c") or std.mem.eql(u8, ext, ".h")) return "text/x-c";
if (std.mem.eql(u8, ext, ".zig")) return "text/x-zig";
if (std.mem.eql(u8, ext, ".rs")) return "text/x-rust";
if (std.mem.eql(u8, ext, ".py")) return "text/x-python";
if (std.mem.eql(u8, ext, ".sh")) return "text/x-shellscript";
if (std.mem.eql(u8, ext, ".sql")) return "application/sql";
if (std.mem.eql(u8, ext, ".webp")) return "image/webp";
if (std.mem.eql(u8, ext, ".ico")) return "image/x-icon";
if (std.mem.eql(u8, ext, ".woff2")) return "font/woff2";
if (std.mem.eql(u8, ext, ".woff")) return "font/woff";
if (std.mem.eql(u8, ext, ".ttf")) return "font/ttf";
return "application/octet-stream";
}
// ── fs.watch: an inotify LOOP SOURCE (the dev-reload bell) ───────────────────
// `watch(path)` returns an event-loop source whose wake_fd IS the inotify fd,
// so the loop's own epoll_wait wakes on a save — no polling anywhere. Watches
// the directory RECURSIVELY at registration (dot-dirs skipped); directories
// created afterwards are picked up the next time the app is restarted, which
// is the honest v1 for a dev tool.
//
// EXCLUSIONS (mission 266). `watch(path, exclude)` takes a second argument —
// a path STRING or a LIST of them, the same either-shape the plugin surface
// already uses in `hl_proc_spawn` — naming directories the descent must not
// enter. One argument still means "watch everything": the argument is optional
// and a null is the same as absent.
//
// This exists because a program that knows, at startup, about a directory it
// will write to constantly (hl:web's session store is the first) had NO way to
// say so. The only skip the walker possessed was "the name starts with a dot",
// so the framework's advice was to RENAME the directory — a lecture standing
// in for a fix. The dot-dir skip STAYS; `.git` is its reason and it is a good
// one. This is a second, explicit reason to skip, not a replacement.
const WatchState = struct {
ifd: i32,
buf: [4096]u8 align(4) = undefined,
len: usize = 0,
pos: usize = 0,
};
/// LEXICAL path normalisation — collapses `//` and resolves `.` / `..`
/// without touching the filesystem. It must be lexical: an excluded directory
/// need not exist yet at the moment the watch is armed (hl:web resolves its
/// session dir before it creates it), and realpath(2) on a missing path fails.
/// Both the watch root and every exclusion go through this, so the comparison
/// below is between two paths written the same way.
fn normalizePath(path: []const u8) ?[]u8 {
const absolute = path.len > 0 and path[0] == '/';
var parts = std.ArrayListUnmanaged([]const u8).empty;
defer parts.deinit(allocator);
var it = std.mem.tokenizeScalar(u8, path, '/');
while (it.next()) |seg| {
if (std.mem.eql(u8, seg, ".")) continue;
if (std.mem.eql(u8, seg, "..")) {
if (parts.items.len > 0 and !std.mem.eql(u8, parts.items[parts.items.len - 1], "..")) {
_ = parts.pop();
continue;
}
if (absolute) continue; // ".." above "/" is "/"
}
parts.append(allocator, seg) catch return null;
}
var out = std.ArrayListUnmanaged(u8).empty;
defer out.deinit(allocator);
for (parts.items, 0..) |seg, i| {
if (absolute or i > 0) out.append(allocator, '/') catch return null;
out.appendSlice(allocator, seg) catch return null;
}
if (out.items.len == 0) out.appendSlice(allocator, if (absolute) "/" else ".") catch return null;
return allocator.dupe(u8, out.items) catch null;
}
/// Is `child` the directory `root`, or somewhere under it? Both must already
/// be normalised. A bare `startsWith` would call `/a/sessions-old` a child of
/// `/a/sessions`, which is the whole reason this is a function: the byte after
/// the prefix has to BE a separator.
fn pathIsInside(child: []const u8, root: []const u8) bool {
if (root.len == 0) return false;
if (std.mem.eql(u8, child, root)) return true;
if (child.len <= root.len) return false;
if (!std.mem.startsWith(u8, child, root)) return false;
if (root[root.len - 1] == '/') return true; // root is "/" itself
return child[root.len] == '/';
}
fn addWatchesRecursive(ifd: i32, dir_path: []const u8, depth: u32, excludes: []const []const u8) void {
if (depth > 8) return;
// The SECOND reason to skip a directory (mission 266). `dir_path` is
// normalised: the root was normalised before the first call and every
// child below is that root plus one plain name.
for (excludes) |ex| if (pathIsInside(dir_path, ex)) return;
const path_z = allocator.dupeZ(u8, dir_path) catch return;
defer allocator.free(path_z);
const mask: u32 = linux.IN.CLOSE_WRITE | linux.IN.CREATE | linux.IN.DELETE | linux.IN.MOVED_TO | linux.IN.MOVED_FROM;
_ = linux.inotify_add_watch(ifd, path_z, mask);
// The descent walks getdents64 directly, like hl_fs_list_dir does — this
// plugin speaks raw syscalls throughout and never pulls in std.fs.
const rc = linuxOpenRc(path_z, .{ .DIRECTORY = true }, 0);
if (rc < 0) return;
const fd: i32 = @intCast(rc);
defer _ = linux.close(fd);
var dents: [4096]u8 align(8) = undefined;
while (true) {
const got = linux.getdents64(fd, &dents, dents.len);
if (@as(isize, @bitCast(got)) <= 0) break;
var pos: usize = 0;
while (pos < got) {
const entry: *align(1) linux.dirent64 = @ptrCast(&dents[pos]);
pos += entry.reclen;
if (entry.type != linux.DT.DIR) continue;
const name_ptr: [*]const u8 = @ptrCast(&entry.name);
const name_len = std.mem.indexOfScalar(u8, name_ptr[0..256], 0) orelse continue;
const name = name_ptr[0..name_len];
// "." and ".." would recurse forever; every other dot-dir is noise
// for a dev watcher (.git alone would cost thousands of watches).
if (name.len == 0 or name[0] == '.') continue;
const child = std.fmt.allocPrint(allocator, "{s}/{s}", .{ dir_path, name }) catch continue;
defer allocator.free(child);
addWatchesRecursive(ifd, child, depth + 1, excludes);
}
}
}
/// One exclusion, resolved against the script dir like every other hl:fs path
/// and then normalised. Appends nothing on an empty string.
fn appendExclusion(list: *std.ArrayListUnmanaged([]u8), raw: []const u8) bool {
if (raw.len == 0) return true;
const resolved = resolvePath(raw) orelse return false;
defer allocator.free(resolved);
const norm = normalizePath(resolved) orelse return false;
list.append(allocator, norm) catch {
allocator.free(norm);
return false;
};
return true;
}
export fn hl_fs_watch(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeError("hl:fs: watch(path) needs a path string");
const raw = argv[0].data.string.ptr[0..argv[0].data.string.len];
const resolved = resolvePath(raw) orelse return api.makeError("hl:fs: watch: could not resolve the path");
defer allocator.free(resolved);
const path = normalizePath(resolved) orelse return api.makeError("hl:fs: watch: could not resolve the path");
defer allocator.free(path);
// THE OPTIONAL SECOND ARGUMENT: absent or null → watch everything, exactly
// as before. A string is one directory; an object with numeric keys is the
// loader's list shape (`hl_proc_spawn` reads its argv list the same way).
var excludes = std.ArrayListUnmanaged([]u8).empty;
defer {
for (excludes.items) |e| allocator.free(e);
excludes.deinit(allocator);
}
if (argc >= 2) {
switch (argv[1].type) {
.hl_null => {},
.hl_string => {
const sv = argv[1].data.string;
if (!appendExclusion(&excludes, sv.ptr[0..sv.len])) return api.makeError("hl:fs: out of memory");
},
.hl_object => {
const obj_in = argv[1].data.object;
for (obj_in.fields[0..obj_in.field_count]) |field| {
if (field.value.type == .hl_null) continue;
if (field.value.type != .hl_string) return api.makeError("hl:fs: watch(path, exclude): every exclusion must be a path string");
const sv = field.value.data.string;
if (!appendExclusion(&excludes, sv.ptr[0..sv.len])) return api.makeError("hl:fs: out of memory");
}
},
else => return api.makeError("hl:fs: watch(path, exclude): exclude is a path string or a list of path strings"),
}
}
const rc = linux.inotify_init1(linux.IN.NONBLOCK);
const ifd: i32 = @intCast(@as(isize, @bitCast(rc)));
if (ifd < 0) return api.makeError("hl:fs: watch: inotify unavailable");
addWatchesRecursive(ifd, path, 0, excludes.items);
const state = allocator.create(WatchState) catch return api.makeError("hl:fs: out of memory");
state.* = .{ .ifd = ifd };
const iter = allocator.create(HlIterator) catch return api.makeError("hl:fs: out of memory");
iter.* = .{
.context = @ptrCast(state),
.next_fn = &watchTryNext, // non-blocking either way — event loop only
.try_next_fn = &watchTryNext,
.deinit_fn = &watchDeinit,
.wake_fd = ifd,
};
return api.makeIterator(iter);
}
fn watchTryNext(ctx: ?*anyopaque) callconv(.c) HlValue {
const st: *WatchState = @ptrCast(@alignCast(ctx orelse return api.makeNull()));
if (st.pos >= st.len) {
const r = linux.read(st.ifd, &st.buf, st.buf.len);
const n: isize = @bitCast(r);
if (n <= 0) return api.makeNull(); // EAGAIN: drained
st.len = @intCast(n);
st.pos = 0;
}
// one inotify_event: wd(i32) mask(u32) cookie(u32) len(u32) name[len]
const base = st.pos;
if (st.len - base < 16) {
st.pos = st.len;
return api.makeNull();
}
const name_len = std.mem.readInt(u32, st.buf[base + 12 ..][0..4], .little);
const name_start = base + 16;
var name: []const u8 = "";
if (name_len > 0 and name_start + name_len <= st.len) {
const raw_name = st.buf[name_start .. name_start + name_len];
name = std.mem.sliceTo(raw_name, 0);
}
st.pos = name_start + name_len;
const fields = allocator.alloc(api.HlField, 1) catch return api.makeNull();
fields[0] = .{ .key = hlStr("name"), .value = api.makeString(allocator.dupe(u8, name) catch "") };
const obj = allocator.create(api.HlObject) catch {
allocator.free(fields);
return api.makeNull();
};
obj.* = .{ .fields = fields.ptr, .field_count = 1, .deinit_fn = null };
return api.makeObject(obj);
}
fn watchDeinit(ctx: ?*anyopaque) callconv(.c) void {
const st: *WatchState = @ptrCast(@alignCast(ctx orelse return));
_ = linux.close(st.ifd);
allocator.destroy(st);
}
// =========================================================================
// THE WRITE SURFACE (2026-08-28)
//
// hl:fs was READ-ONLY until this block: file, readFile, listDir, exists,
// watch. It could report a file's `chmod` and never set one. Session
// persistence is the first thing in this tree that has to put bytes on a
// disk, and the rule when the framework can do something the language
// cannot is that the LANGUAGE is missing it — so the capability lands here,
// as an ordinary hl:fs surface any program can use, not as a private hook
// the session store reaches through.
//
// Three calls, and the shape of each is a decision:
//
// writeFile(path, contents, mode?) ATOMIC. Writes a sibling temp file,
// fsyncs it, then rename()s it over the target — so a reader sees
// either the whole previous file or the whole new one, never a torn
// one. A half-written session file that revives as garbage is a
// silent logout, and the crash that produces it is exactly the crash
// nobody can reproduce. rename(2) within one directory is atomic on
// every filesystem Linux ships; that is the whole reason the temp
// file is a SIBLING rather than in /tmp (a cross-device rename fails).
// mkDir(path, mode?) recursive, and succeeds when the
// directory is already there — the caller wants it to exist, not to
// be the one who created it.
// remove(path) IDEMPOTENT: true when the path is
// gone on return, including when it was already gone. A sweep
// deleting an expired file must not fail because something else
// deleted it first.
//
// MODES ARE EXPLICIT AND DEFAULT TIGHT. hybrilior passes no mode anywhere,
// so its session files land at whatever the umask says — 0644 on a shared
// box, i.e. every session on the machine readable by every other tenant.
// Here the default is 0600 for a file and 0700 for a directory, and a
// caller who wants them looser has to say so. This is not the kind of bug
// that shows up in a test; it shows up in someone else's logs.
// =========================================================================
fn makeWriteError(op: []const u8, path: []const u8, errno: usize) api.HlValue {
const msg = std.fmt.allocPrint(allocator, "{s}: cannot write '{s}' — {s} (errno {d}); relative paths resolve against the script's directory", .{ op, path, errnoText(errno), errno }) catch
return api.makeError("fs: write failed");
var v = api.makeError(msg);
v.deinit_fn = &errDeinit;
return v;
}
/// mkdir every missing component of `path`. Returns 0, or the errno of the
/// first component that could not be created for a reason other than "it is
/// already there".
fn mkdirRecursive(path: []const u8, mode: u32) usize {
if (path.len == 0) return 0;
const buf = allocator.dupeZ(u8, path) catch return 12; // ENOMEM
defer allocator.free(buf);
// Walk the separators left to right, creating each prefix in turn. Index
// 0 is skipped so a leading '/' is never itself a component to create.
var i: usize = 1;
while (i <= buf.len) : (i += 1) {
const at_end = i == buf.len;
if (!at_end and buf[i] != '/') continue;
if (!at_end) buf[i] = 0;
const rc: isize = @bitCast(linux.mkdir(buf.ptr, mode));
if (!at_end) buf[i] = '/';
if (rc < 0) {
const errno: usize = @intCast(-rc);
// EEXIST is the success case: the caller wants it to exist.
if (errno != 17) return errno;
}
}
return 0;
}
export fn hl_fs_mk_dir(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeError("fs.mkDir expects a string path");
const path_str = argv[0].data.string;
const path = path_str.ptr[0..path_str.len];
var mode: u32 = 0o700;
if (argc >= 2 and argv[1].type == .hl_number) mode = @intFromFloat(argv[1].data.number);
const resolved = resolvePath(path) orelse return api.makeError("fs.mkDir: out of memory");
defer allocator.free(resolved);
const errno = mkdirRecursive(resolved, mode);
if (errno != 0) return makeWriteError("fs.mkDir", path, errno);
return api.makeBool(true);
}
const write_usage = "fs.writeFile expects (String path, String or Bytes contents, Number mode?)";
export fn hl_fs_write_file(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 2 or argv[0].type != .hl_string or argv[1].type != .hl_string) {
return api.makeError(write_usage);
}
const path_str = argv[0].data.string;
const body_str = argv[1].data.string;
return writeWhole(path_str.ptr[0..path_str.len], body_str.ptr[0..body_str.len], modeArg(argc, argv));
}
/// hl_fs_write_file_hex(path, hex, mode?) — writeFile with a Bytes (ticket
/// #88): a Bytes crosses the plugin boundary as its hex text (the ABI has no
/// Bytes, as hl:proc's write_hex says), is decoded here and written raw.
export fn hl_fs_write_file_hex(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 2 or argv[0].type != .hl_string or argv[1].type != .hl_string) {
return api.makeError(write_usage);
}
const path_str = argv[0].data.string;
const hex = argv[1].data.string.ptr[0..argv[1].data.string.len];
const raw = allocator.alloc(u8, hex.len / 2) catch return api.makeError("fs.writeFile: out of memory");
defer allocator.free(raw);
_ = std.fmt.hexToBytes(raw, hex) catch return api.makeError("fs.writeFile: not a Bytes");
return writeWhole(path_str.ptr[0..path_str.len], raw, modeArg(argc, argv));
}
fn modeArg(argc: u32, argv: [*]const HlValue) u32 {
if (argc >= 3 and argv[2].type == .hl_number) return @intFromFloat(argv[2].data.number);
return 0o600;
}
fn writeWhole(path: []const u8, body: []const u8, mode: u32) HlValue {
const resolved = resolvePath(path) orelse return api.makeError("fs.writeFile: out of memory");
defer allocator.free(resolved);
// The temp name is a SIBLING (see the block comment): rename(2) is only
// atomic within one filesystem, and /tmp is routinely a different one.
// The pid keeps two processes writing the same path off each other's temp
// file; the rename itself settles who wins the target.
const pid = linux.getpid();
const tmp = std.fmt.allocPrintSentinel(allocator, "{s}.hltmp{d}", .{ resolved, pid }, 0) catch
return api.makeError("fs.writeFile: out of memory");
defer allocator.free(tmp);
const rc = linuxOpenRc(tmp.ptr, .{ .ACCMODE = .WRONLY, .CREAT = true, .TRUNC = true }, mode);
if (rc < 0) return makeWriteError("fs.writeFile", path, @intCast(-rc));
const fd: i32 = @intCast(rc);
var wrote: usize = 0;
while (wrote < body.len) {
const n: isize = @bitCast(linux.write(fd, body.ptr + wrote, body.len - wrote));
if (n <= 0) {
_ = linux.close(fd);
_ = linux.unlink(tmp.ptr);
return makeWriteError("fs.writeFile", path, if (n < 0) @intCast(-n) else 5);
}
wrote += @intCast(n);
}
// fsync BEFORE the rename, or the rename can land while the bytes are
// still only in the page cache — a power cut then leaves an EMPTY file
// where a complete one used to be, which is worse than either outcome.
_ = linux.fsync(fd);
_ = linux.close(fd);
// O_CREAT honours the mode only through the umask; say it outright so a
// 0600 request is 0600 whatever the process umask happens to be.
_ = linux.chmod(tmp.ptr, mode);
const path_z = allocator.dupeZ(u8, resolved) catch return api.makeError("fs.writeFile: out of memory");
defer allocator.free(path_z);
const ren: isize = @bitCast(linux.rename(tmp.ptr, path_z.ptr));
if (ren < 0) {
_ = linux.unlink(tmp.ptr);
return makeWriteError("fs.writeFile", path, @intCast(-ren));
}
return api.makeBool(true);
}
export fn hl_fs_remove(argc: u32, argv: [*]const HlValue) callconv(.c) HlValue {
if (argc < 1 or argv[0].type != .hl_string) return api.makeError("fs.remove expects a string path");
const path_str = argv[0].data.string;
const path = path_str.ptr[0..path_str.len];
const resolved = resolvePath(path) orelse return api.makeError("fs.remove: out of memory");
defer allocator.free(resolved);
const path_z = allocator.dupeZ(u8, resolved) catch return api.makeError("fs.remove: out of memory");
defer allocator.free(path_z);
const rc: isize = @bitCast(linux.unlink(path_z.ptr));
if (rc < 0) {
const errno: usize = @intCast(-rc);
// ENOENT is success: the caller asked for the path to be gone.
if (errno == 2) return api.makeBool(true);
return makeWriteError("fs.remove", path, errno);
}
return api.makeBool(true);
}

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e2deed6dgitoria#20: "Add code" only on the Code page of an empty repository, no collapsiblemre2026-09-27 14:59
8bb97ffddeploy.sh: never send .git or .gitignore to Byrodinmre2026-09-27 12:20
fd981932State of 2026-09-27; bin/ no longer tracked (Hybriel commit is in README)mre2026-09-27 12:20
4a2d7125initial commitmre2026-09-25 19:10