README.md

@@ -19,7 +19,7 @@ C version (1.x).
 
 ## Requirements
 
-- Zig 0.14 or 0.15
+- Zig 0.14
 - Some sort of POSIX-like OS
 - ncurses
 - libzstd

src/bin_export.zig

@@ -11,7 +11,7 @@ const c = @import("c.zig").c;
 
 pub const global = struct {
     var fd: std.fs.File = undefined;
-    var index: std.ArrayListUnmanaged(u8) = .empty;
+    var index = std.ArrayList(u8).init(main.allocator);
     var file_off: u64 = 0;
     var lock: std.Thread.Mutex = .{};
     var root_itemref: u64 = 0;
@@ -105,11 +105,11 @@ pub const Thread = struct {
         }
     }
 
-    fn createBlock(t: *Thread) std.ArrayListUnmanaged(u8) {
-        var out: std.ArrayListUnmanaged(u8) = .empty;
+    fn createBlock(t: *Thread) std.ArrayList(u8) {
+        var out = std.ArrayList(u8).init(main.allocator);
         if (t.block_num == std.math.maxInt(u32) or t.off == 0) return out;
 
-        out.ensureTotalCapacityPrecise(main.allocator, 12 + @as(usize, @intCast(c.ZSTD_COMPRESSBOUND(@as(c_int, @intCast(t.off)))))) catch unreachable;
+        out.ensureTotalCapacityPrecise(12 + @as(usize, @intCast(c.ZSTD_COMPRESSBOUND(@as(c_int, @intCast(t.off)))))) catch unreachable;
         out.items.len = out.capacity;
         const bodylen = compressZstd(t.buf[0..t.off], out.items[8..]);
         out.items.len = 12 + bodylen;
@@ -122,8 +122,8 @@ pub const Thread = struct {
 
     fn flush(t: *Thread, expected_len: usize) void {
         @branchHint(.unlikely);
-        var block = createBlock(t);
-        defer block.deinit(main.allocator);
+        const block = createBlock(t);
+        defer block.deinit();
 
         global.lock.lock();
         defer global.lock.unlock();
@@ -141,7 +141,7 @@ pub const Thread = struct {
 
         t.off = 0;
         t.block_num = @intCast((global.index.items.len - 4) / 8);
-        global.index.appendSlice(main.allocator, &[1]u8{0}**8) catch unreachable;
+        global.index.appendSlice(&[1]u8{0}**8) catch unreachable;
         if (global.index.items.len + 12 >= (1<<28)) ui.die("Too many data blocks, please report a bug.\n", .{});
 
         const newsize = blockSize(t.block_num);
@@ -447,12 +447,12 @@ pub fn done(threads: []sink.Thread) void {
 
     while (std.mem.endsWith(u8, global.index.items, &[1]u8{0}**8))
         global.index.shrinkRetainingCapacity(global.index.items.len - 8);
-    global.index.appendSlice(main.allocator, &bigu64(global.root_itemref)) catch unreachable;
-    global.index.appendSlice(main.allocator, &blockHeader(1, @intCast(global.index.items.len + 4))) catch unreachable;
+    global.index.appendSlice(&bigu64(global.root_itemref)) catch unreachable;
+    global.index.appendSlice(&blockHeader(1, @intCast(global.index.items.len + 4))) catch unreachable;
     global.index.items[0..4].* = blockHeader(1, @intCast(global.index.items.len));
     global.fd.writeAll(global.index.items) catch |e|
         ui.die("Error writing to file: {s}.\n", .{ ui.errorString(e) });
-    global.index.clearAndFree(main.allocator);
+    global.index.clearAndFree();
 
     global.fd.close();
 }
@@ -464,5 +464,5 @@ pub fn setupOutput(fd: std.fs.File) void {
     global.file_off = 8;
 
     // Placeholder for the index block header.
-    global.index.appendSlice(main.allocator, "aaaa") catch unreachable;
+    global.index.appendSlice("aaaa") catch unreachable;
 }

src/browser.zig

@@ -15,16 +15,16 @@ const util = @import("util.zig");
 // Currently opened directory.
 pub var dir_parent: *model.Dir = undefined;
 pub var dir_path: [:0]u8 = undefined;
-var dir_parents: std.ArrayListUnmanaged(model.Ref) = .empty;
+var dir_parents = std.ArrayList(model.Ref).init(main.allocator);
 var dir_alloc = std.heap.ArenaAllocator.init(main.allocator);
 
 // Used to keep track of which dir is which ref, so we can enter it.
 // Only used for binreader browsing.
-var dir_refs: std.ArrayListUnmanaged(struct { ptr: *model.Dir, ref: u64 }) = .empty;
+var dir_refs = std.ArrayList(struct { ptr: *model.Dir, ref: u64 }).init(main.allocator);
 
 // Sorted list of all items in the currently opened directory.
 // (first item may be null to indicate the "parent directory" item)
-var dir_items: std.ArrayListUnmanaged(?*model.Entry) = .empty;
+var dir_items = std.ArrayList(?*model.Entry).init(main.allocator);
 
 var dir_max_blocks: u64 = 0;
 var dir_max_size: u64 = 0;
@@ -146,7 +146,7 @@ pub fn loadDir(next_sel: u64) void {
     dir_has_shared = false;
 
     if (dir_parents.items.len > 1)
-        dir_items.append(main.allocator, null) catch unreachable;
+        dir_items.append(null) catch unreachable;
     var ref = dir_parent.sub;
     while (!ref.isNull()) {
         const e =
@@ -164,10 +164,10 @@ pub fn loadDir(next_sel: u64) void {
             break :blk !excl and name[0] != '.' and name[name.len-1] != '~';
         };
         if (shown) {
-            dir_items.append(main.allocator, e) catch unreachable;
+            dir_items.append(e) catch unreachable;
             if (e.dir()) |d| {
                 if (d.shared_blocks > 0 or d.shared_size > 0) dir_has_shared = true;
-                if (main.config.binreader) dir_refs.append(main.allocator, .{ .ptr = d, .ref = ref.ref }) catch unreachable;
+                if (main.config.binreader) dir_refs.append(.{ .ptr = d, .ref = ref.ref }) catch unreachable;
             }
         }
 
@@ -185,10 +185,10 @@ pub fn initRoot() void {
     if (main.config.binreader) {
         const ref = bin_reader.getRoot();
         dir_parent = bin_reader.get(ref, main.allocator).dir() orelse ui.die("Invalid import\n", .{});
-        dir_parents.append(main.allocator, .{ .ref = ref }) catch unreachable;
+        dir_parents.append(.{ .ref = ref }) catch unreachable;
     } else {
         dir_parent = model.root;
-        dir_parents.append(main.allocator, .{ .ptr = &dir_parent.entry }) catch unreachable;
+        dir_parents.append(.{ .ptr = &dir_parent.entry }) catch unreachable;
     }
     dir_path = main.allocator.dupeZ(u8, dir_parent.entry.name()) catch unreachable;
     loadDir(0);
@@ -202,10 +202,10 @@ fn enterSub(e: *model.Dir) void {
         };
         dir_parent.entry.destroy(main.allocator);
         dir_parent = bin_reader.get(ref, main.allocator).dir() orelse unreachable;
-        dir_parents.append(main.allocator, .{ .ref = ref }) catch unreachable;
+        dir_parents.append(.{ .ref = ref }) catch unreachable;
     } else {
         dir_parent = e;
-        dir_parents.append(main.allocator, .{ .ptr = &e.entry }) catch unreachable;
+        dir_parents.append(.{ .ptr = &e.entry }) catch unreachable;
     }
 
     const newpath = std.fs.path.joinZ(main.allocator, &[_][]const u8{ dir_path, e.entry.name() }) catch unreachable;
@@ -430,7 +430,7 @@ const info = struct {
 
     var tab: Tab = .info;
     var entry: ?*model.Entry = null;
-    var links: ?std.ArrayListUnmanaged(*model.Link) = null;
+    var links: ?std.ArrayList(*model.Link) = null;
     var links_top: usize = 0;
     var links_idx: usize = 0;
 
@@ -445,7 +445,7 @@ const info = struct {
     // Set the displayed entry to the currently selected item and open the tab.
     fn set(e: ?*model.Entry, t: Tab) void {
         if (e != entry) {
-            if (links) |*l| l.deinit(main.allocator);
+            if (links) |*l| l.deinit();
             links = null;
             links_top = 0;
             links_idx = 0;
@@ -458,10 +458,10 @@ const info = struct {
         state = .info;
         tab = t;
         if (tab == .links and links == null and !main.config.binreader) {
-            var list: std.ArrayListUnmanaged(*model.Link) = .empty;
+            var list = std.ArrayList(*model.Link).init(main.allocator);
             var l = e.?.link().?;
             while (true) {
-                list.append(main.allocator, l) catch unreachable;
+                list.append(l) catch unreachable;
                 l = l.next;
                 if (&l.entry == e)
                     break;

src/delete.zig

@@ -136,19 +136,19 @@ pub fn delete() ?*model.Entry {
         if (it.* == entry)
             break;
 
-    var path: std.ArrayListUnmanaged(u8) = .empty;
-    defer path.deinit(main.allocator);
-    parent.fmtPath(main.allocator, true, &path);
+    var path = std.ArrayList(u8).init(main.allocator);
+    defer path.deinit();
+    parent.fmtPath(true, &path);
     if (path.items.len == 0 or path.items[path.items.len-1] != '/')
-        path.append(main.allocator, '/') catch unreachable;
-    path.appendSlice(main.allocator, entry.name()) catch unreachable;
+        path.append('/') catch unreachable;
+    path.appendSlice(entry.name()) catch unreachable;
 
     if (main.config.delete_command.len == 0) {
-        _ = deleteItem(std.fs.cwd(), util.arrayListBufZ(&path, main.allocator), it);
+        _ = deleteItem(std.fs.cwd(), util.arrayListBufZ(&path), it);
         model.inodes.addAllStats();
         return if (it.* == e) e else next_sel;
     } else {
-        const isdel = deleteCmd(util.arrayListBufZ(&path, main.allocator), it);
+        const isdel = deleteCmd(util.arrayListBufZ(&path), it);
         model.inodes.addAllStats();
         return if (isdel) next_sel else it.*;
     }
@@ -197,17 +197,17 @@ fn drawConfirm() void {
 }
 
 fn drawProgress() void {
-    var path: std.ArrayListUnmanaged(u8) = .empty;
-    defer path.deinit(main.allocator);
-    parent.fmtPath(main.allocator, false, &path);
-    path.append(main.allocator, '/') catch unreachable;
-    path.appendSlice(main.allocator, entry.name()) catch unreachable;
+    var path = std.ArrayList(u8).init(main.allocator);
+    defer path.deinit();
+    parent.fmtPath(false, &path);
+    path.append('/') catch unreachable;
+    path.appendSlice(entry.name()) catch unreachable;
 
     // TODO: Item counts and progress bar would be nice.
 
     const box = ui.Box.create(6, 60, "Deleting...");
     box.move(2, 2);
-    ui.addstr(ui.shorten(ui.toUtf8(util.arrayListBufZ(&path, main.allocator)), 56));
+    ui.addstr(ui.shorten(ui.toUtf8(util.arrayListBufZ(&path)), 56));
     box.move(4, 41);
     ui.addstr("Press ");
     ui.style(.key);
@@ -217,16 +217,16 @@ fn drawProgress() void {
 }
 
 fn drawErr() void {
-    var path: std.ArrayListUnmanaged(u8) = .empty;
-    defer path.deinit(main.allocator);
-    parent.fmtPath(main.allocator, false, &path);
-    path.append(main.allocator, '/') catch unreachable;
-    path.appendSlice(main.allocator, entry.name()) catch unreachable;
+    var path = std.ArrayList(u8).init(main.allocator);
+    defer path.deinit();
+    parent.fmtPath(false, &path);
+    path.append('/') catch unreachable;
+    path.appendSlice(entry.name()) catch unreachable;
 
     const box = ui.Box.create(6, 60, "Error");
     box.move(1, 2);
     ui.addstr("Error deleting ");
-    ui.addstr(ui.shorten(ui.toUtf8(util.arrayListBufZ(&path, main.allocator)), 41));
+    ui.addstr(ui.shorten(ui.toUtf8(util.arrayListBufZ(&path)), 41));
     box.move(2, 4);
     ui.addstr(ui.errorString(error_code));
 

src/exclude.zig

@@ -123,7 +123,7 @@ test "parse" {
 fn PatternList(comptime withsub: bool) type {
     return struct {
         literals: std.HashMapUnmanaged(*const Pattern, Val, Ctx, 80) = .{},
-        wild: std.ArrayListUnmanaged(*const Pattern) = .empty,
+        wild: std.ArrayListUnmanaged(*const Pattern) = .{},
 
         // Not a fan of the map-of-arrays approach in the 'withsub' case, it
         // has a lot of extra allocations. Linking the Patterns together in a

src/main.zig

@@ -80,6 +80,7 @@ pub const config = struct {
     pub var follow_symlinks: bool = false;
     pub var exclude_caches: bool = false;
     pub var exclude_kernfs: bool = false;
+    pub var exclude_patterns: std.ArrayList([:0]const u8) = std.ArrayList([:0]const u8).init(allocator);
     pub var threads: usize = 1;
     pub var complevel: u8 = 4;
     pub var compress: bool = false;
@@ -118,9 +119,6 @@ pub const config = struct {
 
 pub var state: enum { scan, browse, refresh, shell, delete } = .scan;
 
-const stdin = if (@hasDecl(std.io, "getStdIn")) std.io.getStdIn() else std.fs.File.stdin();
-const stdout = if (@hasDecl(std.io, "getStdOut")) std.io.getStdOut() else std.fs.File.stdout();
-
 // Simple generic argument parser, supports getopt_long() style arguments.
 const Args = struct {
     lst: []const [:0]const u8,
@@ -330,13 +328,19 @@ fn tryReadArgsFile(path: [:0]const u8) void {
     };
     defer f.close();
 
-    var line_buf: [4096]u8 = undefined;
-    var line_rd = util.LineReader.init(f, &line_buf);
+    var rd_ = std.io.bufferedReader(f.reader());
+    const rd = rd_.reader();
 
-    while (true) {
-        const line_ = (line_rd.read() catch |e|
-            ui.die("Error reading from {s}: {s}\nRun with --ignore-config to skip reading config files.\n", .{ path, ui.errorString(e) })
-        ) orelse break;
+    var line_buf: [4096]u8 = undefined;
+    var line_fbs = std.io.fixedBufferStream(&line_buf);
+    const line_writer = line_fbs.writer();
+
+    while (true) : (line_fbs.reset()) {
+        rd.streamUntilDelimiter(line_writer, '\n', line_buf.len) catch |err| switch (err) {
+            error.EndOfStream => if (line_fbs.getPos() catch unreachable == 0) break,
+            else => |e| ui.die("Error reading from {s}: {s}\nRun with --ignore-config to skip reading config files.\n", .{ path, ui.errorString(e) }),
+        };
+        const line_ = line_fbs.getWritten();
 
         var argc: usize = 0;
         var ignerror = false;
@@ -371,11 +375,13 @@ fn tryReadArgsFile(path: [:0]const u8) void {
 }
 
 fn version() noreturn {
+    const stdout = std.io.getStdOut();
     stdout.writeAll("ncdu " ++ program_version ++ "\n") catch {};
     std.process.exit(0);
 }
 
 fn help() noreturn {
+    const stdout = std.io.getStdOut();
     stdout.writeAll(
     \\ncdu <options> <directory>
     \\
@@ -438,9 +444,19 @@ fn readExcludeFile(path: [:0]const u8) !void {
     const f = try std.fs.cwd().openFileZ(path, .{});
     defer f.close();
 
+    var rd_ = std.io.bufferedReader(f.reader());
+    const rd = rd_.reader();
+
     var line_buf: [4096]u8 = undefined;
-    var line_rd = util.LineReader.init(f, &line_buf);
-    while (try line_rd.read()) |line| {
+    var line_fbs = std.io.fixedBufferStream(&line_buf);
+    const line_writer = line_fbs.writer();
+
+    while (true) : (line_fbs.reset()) {
+        rd.streamUntilDelimiter(line_writer, '\n', line_buf.len) catch |err| switch (err) {
+            error.EndOfStream => if (line_fbs.getPos() catch unreachable == 0) break,
+            else => |e| return e,
+        };
+        const line = line_fbs.getWritten();
         if (line.len > 0)
             exclude.addPattern(line);
     }
@@ -448,12 +464,12 @@ fn readExcludeFile(path: [:0]const u8) !void {
 
 fn readImport(path: [:0]const u8) !void {
     const fd =
-        if (std.mem.eql(u8, "-", path)) stdin
+        if (std.mem.eql(u8, "-", path)) std.io.getStdIn()
         else try std.fs.cwd().openFileZ(path, .{});
     errdefer fd.close();
 
     var buf: [8]u8 = undefined;
-    if (8 != try fd.readAll(&buf)) return error.EndOfStream;
+    try fd.reader().readNoEof(&buf);
     if (std.mem.eql(u8, &buf, bin_export.SIGNATURE)) {
         try bin_reader.open(fd);
         config.binreader = true;
@@ -535,6 +551,8 @@ pub fn main() void {
     if (@import("builtin").os.tag != .linux and config.exclude_kernfs)
         ui.die("The --exclude-kernfs flag is currently only supported on Linux.\n", .{});
 
+    const stdin = std.io.getStdIn();
+    const stdout = std.io.getStdOut();
     const out_tty = stdout.isTty();
     const in_tty = stdin.isTty();
     if (config.scan_ui == null) {
@@ -592,10 +610,10 @@ pub fn main() void {
     while (true) {
         switch (state) {
             .refresh => {
-                var full_path: std.ArrayListUnmanaged(u8) = .empty;
-                defer full_path.deinit(allocator);
-                mem_sink.global.root.?.fmtPath(allocator, true, &full_path);
-                scan.scan(util.arrayListBufZ(&full_path, allocator)) catch {
+                var full_path = std.ArrayList(u8).init(allocator);
+                defer full_path.deinit();
+                mem_sink.global.root.?.fmtPath(true, &full_path);
+                scan.scan(util.arrayListBufZ(&full_path)) catch {
                     sink.global.last_error = allocator.dupeZ(u8, full_path.items) catch unreachable;
                     sink.global.state = .err;
                     while (state == .refresh) handleEvent(true, true);

src/mem_src.zig

@@ -60,10 +60,10 @@ pub fn run(d: *model.Dir) void {
         .sink = &sink_threads[0],
         .stat = toStat(&d.entry),
     };
-    var buf: std.ArrayListUnmanaged(u8) = .empty;
-    d.fmtPath(main.allocator, true, &buf);
+    var buf = std.ArrayList(u8).init(main.allocator);
+    d.fmtPath(true, &buf);
     const root = sink.createRoot(buf.items, &ctx.stat);
-    buf.deinit(main.allocator);
+    buf.deinit();
 
     var it = d.sub.ptr;
     while (it) |e| : (it = e.next.ptr) rec(&ctx, root, e);

src/model.zig

@@ -109,8 +109,7 @@ pub const Entry = extern struct {
     fn alloc(comptime T: type, allocator: std.mem.Allocator, etype: EType, isext: bool, ename: []const u8) *Entry {
         const size = (if (isext) @as(usize, @sizeOf(Ext)) else 0) + @sizeOf(T) + ename.len + 1;
         var ptr = blk: while (true) {
-            const alignment = if (@typeInfo(@TypeOf(std.mem.Allocator.allocWithOptions)).@"fn".params[3].type == ?u29) 1 else std.mem.Alignment.@"1";
-            if (allocator.allocWithOptions(u8, size, alignment, null)) |p| break :blk p
+            if (allocator.allocWithOptions(u8, size, 1, null)) |p| break :blk p
             else |_| {}
             ui.oom();
         };
@@ -218,20 +217,19 @@ pub const Dir = extern struct {
         suberr: bool = false,
     };
 
-    pub fn fmtPath(self: *const @This(), alloc: std.mem.Allocator, withRoot: bool, out: *std.ArrayListUnmanaged(u8)) void {
+    pub fn fmtPath(self: *const @This(), withRoot: bool, out: *std.ArrayList(u8)) void {
         if (!withRoot and self.parent == null) return;
-        var components: std.ArrayListUnmanaged([:0]const u8) = .empty;
-        defer components.deinit(main.allocator);
+        var components = std.ArrayList([:0]const u8).init(main.allocator);
+        defer components.deinit();
         var it: ?*const @This() = self;
         while (it) |e| : (it = e.parent)
             if (withRoot or e.parent != null)
-                components.append(main.allocator, e.entry.name()) catch unreachable;
+                components.append(e.entry.name()) catch unreachable;
 
         var i: usize = components.items.len-1;
         while (true) {
-            if (i != components.items.len-1 and !(out.items.len != 0 and out.items[out.items.len-1] == '/'))
-                out.append(main.allocator, '/') catch unreachable;
-            out.appendSlice(alloc, components.items[i]) catch unreachable;
+            if (i != components.items.len-1 and !(out.items.len != 0 and out.items[out.items.len-1] == '/')) out.append('/') catch unreachable;
+            out.appendSlice(components.items[i]) catch unreachable;
             if (i == 0) break;
             i -= 1;
         }
@@ -273,11 +271,11 @@ pub const Link = extern struct {
 
     // Return value should be freed with main.allocator.
     pub fn path(self: *const @This(), withRoot: bool) [:0]const u8 {
-        var out: std.ArrayListUnmanaged(u8) = .empty;
-        self.parent.fmtPath(main.allocator, withRoot, &out);
-        out.append(main.allocator, '/') catch unreachable;
-        out.appendSlice(main.allocator, self.entry.name()) catch unreachable;
-        return out.toOwnedSliceSentinel(main.allocator, 0) catch unreachable;
+        var out = std.ArrayList(u8).init(main.allocator);
+        self.parent.fmtPath(withRoot, &out);
+        out.append('/') catch unreachable;
+        out.appendSlice(self.entry.name()) catch unreachable;
+        return out.toOwnedSliceSentinel(0) catch unreachable;
     }
 
     // Add this link to the inodes map and mark it as 'uncounted'.
@@ -352,7 +350,7 @@ pub const Ext = extern struct {
 pub const devices = struct {
     var lock = std.Thread.Mutex{};
     // id -> dev
-    pub var list: std.ArrayListUnmanaged(u64) = .empty;
+    pub var list = std.ArrayList(u64).init(main.allocator);
     // dev -> id
     var lookup = std.AutoHashMap(u64, DevId).init(main.allocator);
 
@@ -363,7 +361,7 @@ pub const devices = struct {
         if (!d.found_existing) {
             if (list.items.len >= std.math.maxInt(DevId)) ui.die("Maximum number of device identifiers exceeded.\n", .{});
             d.value_ptr.* = @as(DevId, @intCast(list.items.len));
-            list.append(main.allocator, dev) catch unreachable;
+            list.append(dev) catch unreachable;
         }
         return d.value_ptr.*;
     }

src/scan.zig

@@ -91,7 +91,7 @@ fn isCacheDir(dir: std.fs.Dir) bool {
     const f = dir.openFileZ("CACHEDIR.TAG", .{}) catch return false;
     defer f.close();
     var buf: [sig.len]u8 = undefined;
-    const len = f.readAll(&buf) catch return false;
+    const len = f.reader().readAll(&buf) catch return false;
     return len == sig.len and std.mem.eql(u8, &buf, sig);
 }
 
@@ -184,7 +184,7 @@ const Thread = struct {
     thread_num: usize,
     sink: *sink.Thread,
     state: *State,
-    stack: std.ArrayListUnmanaged(*Dir) = .empty,
+    stack: std.ArrayList(*Dir) = std.ArrayList(*Dir).init(main.allocator),
     thread: std.Thread = undefined,
     namebuf: [4096]u8 = undefined,
 
@@ -265,13 +265,13 @@ const Thread = struct {
         const s = dir.sink.addDir(t.sink, name, &stat);
         const ndir = Dir.create(edir, stat.dev, dir.pat.enter(name), s);
         if (main.config.threads == 1 or !t.state.tryPush(ndir))
-            t.stack.append(main.allocator, ndir) catch unreachable;
+            t.stack.append(ndir) catch unreachable;
     }
 
     fn run(t: *Thread) void {
-        defer t.stack.deinit(main.allocator);
+        defer t.stack.deinit();
         while (t.state.waitPop()) |dir| {
-            t.stack.append(main.allocator, dir) catch unreachable;
+            t.stack.append(dir) catch unreachable;
 
             while (t.stack.items.len > 0) {
                 const d = t.stack.items[t.stack.items.len - 1];

src/sink.zig

@@ -140,21 +140,20 @@ pub const Dir = struct {
     }
 
     fn path(d: *Dir) [:0]u8 {
-        var components: std.ArrayListUnmanaged([]const u8) = .empty;
-        defer components.deinit(main.allocator);
+        var components = std.ArrayList([]const u8).init(main.allocator);
+        defer components.deinit();
         var it: ?*Dir = d;
-        while (it) |e| : (it = e.parent) components.append(main.allocator, e.name) catch unreachable;
+        while (it) |e| : (it = e.parent) components.append(e.name) catch unreachable;
 
-        var out: std.ArrayListUnmanaged(u8) = .empty;
+        var out = std.ArrayList(u8).init(main.allocator);
         var i: usize = components.items.len-1;
         while (true) {
-            if (i != components.items.len-1 and !(out.items.len != 0 and out.items[out.items.len-1] == '/'))
-                out.append(main.allocator, '/') catch unreachable;
-            out.appendSlice(main.allocator, components.items[i]) catch unreachable;
+            if (i != components.items.len-1 and !(out.items.len != 0 and out.items[out.items.len-1] == '/')) out.append('/') catch unreachable;
+            out.appendSlice(components.items[i]) catch unreachable;
             if (i == 0) break;
             i -= 1;
         }
-        return out.toOwnedSliceSentinel(main.allocator, 0) catch unreachable;
+        return out.toOwnedSliceSentinel(0) catch unreachable;
     }
 
     fn ref(d: *Dir) void {
@@ -292,7 +291,7 @@ fn drawConsole() void {
         var ansi: ?bool = null;
         var lines_written: usize = 0;
     };
-    const stderr = if (@hasDecl(std.io, "getStdErr")) std.io.getStdErr() else std.fs.File.stderr();
+    const stderr = std.io.getStdErr();
     const ansi = st.ansi orelse blk: {
         const t = stderr.supportsAnsiEscapeCodes();
         st.ansi = t;
@@ -451,9 +450,7 @@ pub fn draw() void {
     switch (main.config.scan_ui.?) {
         .none => {},
         .line => drawConsole(),
-        .full => {
-            ui.init();
-            switch (global.state) {
+        .full => switch (global.state) {
             .done => {},
             .err => drawError(),
             .zeroing => {
@@ -472,7 +469,6 @@ pub fn draw() void {
                 }
             },
             .running => drawProgress(),
-            }
         },
     }
 }

src/ui.zig

@@ -17,7 +17,8 @@ pub var cols: u32 = undefined;
 
 pub fn die(comptime fmt: []const u8, args: anytype) noreturn {
     deinit();
-    std.debug.print(fmt, args);
+    const stderr = std.io.getStdErr();
+    stderr.writer().print(fmt, args) catch {};
     std.process.exit(1);
 }
 
@@ -26,8 +27,6 @@ pub fn quit() noreturn {
     std.process.exit(0);
 }
 
-const sleep = if (@hasDecl(std.time, "sleep")) std.time.sleep else std.Thread.sleep;
-
 // Should be called when malloc fails. Will show a message to the user, wait
 // for a second and return to give it another try.
 // Glitch: this function may be called while we're in the process of drawing
@@ -42,13 +41,14 @@ pub fn oom() void {
     if (main_thread == std.Thread.getCurrentId()) {
         const haveui = inited;
         deinit();
-        std.debug.print("\x1b7\x1b[JOut of memory, trying again in 1 second. Hit Ctrl-C to abort.\x1b8", .{});
-        sleep(std.time.ns_per_s);
+        const stderr = std.io.getStdErr();
+        stderr.writeAll("\x1b7\x1b[JOut of memory, trying again in 1 second. Hit Ctrl-C to abort.\x1b8") catch {};
+        std.time.sleep(std.time.ns_per_s);
         if (haveui)
             init();
     } else {
         _ = oom_threads.fetchAdd(1, .monotonic);
-        sleep(std.time.ns_per_s);
+        std.time.sleep(std.time.ns_per_s);
         _ = oom_threads.fetchSub(1, .monotonic);
     }
 }
@@ -80,7 +80,7 @@ pub fn errorString(e: anyerror) [:0]const u8 {
     };
 }
 
-var to_utf8_buf: std.ArrayListUnmanaged(u8) = .empty;
+var to_utf8_buf = std.ArrayList(u8).init(main.allocator);
 
 fn toUtf8BadChar(ch: u8) bool {
     return switch (ch) {
@@ -107,19 +107,19 @@ pub fn toUtf8(in: [:0]const u8) [:0]const u8 {
         if (std.unicode.utf8ByteSequenceLength(in[i])) |cp_len| {
             if (!toUtf8BadChar(in[i]) and i + cp_len <= in.len) {
                 if (std.unicode.utf8Decode(in[i .. i + cp_len])) |_| {
-                    to_utf8_buf.appendSlice(main.allocator, in[i .. i + cp_len]) catch unreachable;
+                    to_utf8_buf.appendSlice(in[i .. i + cp_len]) catch unreachable;
                     i += cp_len;
                     continue;
                 } else |_| {}
             }
         } else |_| {}
-        to_utf8_buf.writer(main.allocator).print("\\x{X:0>2}", .{in[i]}) catch unreachable;
+        to_utf8_buf.writer().print("\\x{X:0>2}", .{in[i]}) catch unreachable;
         i += 1;
     }
-    return util.arrayListBufZ(&to_utf8_buf, main.allocator);
+    return util.arrayListBufZ(&to_utf8_buf);
 }
 
-var shorten_buf: std.ArrayListUnmanaged(u8) = .empty;
+var shorten_buf = std.ArrayList(u8).init(main.allocator);
 
 // Shorten the given string to fit in the given number of columns.
 // If the string is too long, only the prefix and suffix will be printed, with '...' in between.
@@ -150,8 +150,8 @@ pub fn shorten(in: [:0]const u8, max_width: u32) [:0] const u8 {
     if (total_width <= max_width) return in;
 
     shorten_buf.shrinkRetainingCapacity(0);
-    shorten_buf.appendSlice(main.allocator, in[0..prefix_end]) catch unreachable;
-    shorten_buf.appendSlice(main.allocator, "...") catch unreachable;
+    shorten_buf.appendSlice(in[0..prefix_end]) catch unreachable;
+    shorten_buf.appendSlice("...") catch unreachable;
 
     var start_width: u32 = prefix_width;
     var start_len: u32 = prefix_end;
@@ -163,11 +163,11 @@ pub fn shorten(in: [:0]const u8, max_width: u32) [:0] const u8 {
         start_width += cp_width;
         start_len += cp_len;
         if (total_width - start_width <= max_width - prefix_width - 3) {
-            shorten_buf.appendSlice(main.allocator, in[start_len..]) catch unreachable;
+            shorten_buf.appendSlice(in[start_len..]) catch unreachable;
             break;
         }
     }
-    return util.arrayListBufZ(&shorten_buf, main.allocator);
+    return util.arrayListBufZ(&shorten_buf);
 }
 
 fn shortenTest(in: [:0]const u8, max_width: u32, out: [:0]const u8) !void {
@@ -335,7 +335,8 @@ fn updateSize() void {
 fn clearScr() void {
     // Send a "clear from cursor to end of screen" instruction, to clear a
     // potential line left behind from scanning in -1 mode.
-    std.debug.print("\x1b[J", .{});
+    const stderr = std.io.getStdErr();
+    stderr.writeAll("\x1b[J") catch {};
 }
 
 pub fn init() void {
@@ -633,7 +634,7 @@ pub fn getch(block: bool) i32 {
         }
         if (ch == c.ERR) {
             if (!block) return 0;
-            sleep(10*std.time.ns_per_ms);
+            std.time.sleep(10*std.time.ns_per_ms);
             continue;
         }
         return ch;
@@ -642,15 +643,6 @@ pub fn getch(block: bool) i32 {
         .{ c.strerror(@intFromEnum(std.posix.errno(-1))) });
 }
 
-fn waitInput() void {
-    if (@hasDecl(std.io, "getStdIn")) {
-        std.io.getStdIn().reader().skipUntilDelimiterOrEof('\n') catch unreachable;
-    } else {
-        var buf: [512]u8 = undefined;
-        var rd = std.fs.File.stdin().reader(&buf);
-        _ = rd.interface.discardDelimiterExclusive('\n') catch unreachable;
-    }
-}
 
 pub fn runCmd(cmd: []const []const u8, cwd: ?[]const u8, env: *std.process.EnvMap, reporterr: bool) void {
     deinit();
@@ -670,9 +662,14 @@ pub fn runCmd(cmd: []const []const u8, cwd: ?[]const u8, env: *std.process.EnvMa
     child.cwd = cwd;
     child.env_map = env;
 
+    const stdin = std.io.getStdIn();
+    const stderr = std.io.getStdErr();
     const term = child.spawnAndWait() catch |e| blk: {
-        std.debug.print("Error running command: {s}\n\nPress enter to continue.\n", .{ ui.errorString(e) });
-        waitInput();
+        stderr.writer().print(
+            "Error running command: {s}\n\nPress enter to continue.\n",
+            .{ ui.errorString(e) }
+        ) catch {};
+        stdin.reader().skipUntilDelimiterOrEof('\n') catch unreachable;
         break :blk std.process.Child.Term{ .Exited = 0 };
     };
 
@@ -684,7 +681,9 @@ pub fn runCmd(cmd: []const []const u8, cwd: ?[]const u8, env: *std.process.EnvMa
     };
     const v = switch (term) { inline else => |v| v };
     if (term != .Exited or (reporterr and v != 0)) {
-        std.debug.print("\nCommand returned with {s} code {}.\nPress enter to continue.\n", .{ n, v });
-        waitInput();
+        stderr.writer().print(
+            "\nCommand returned with {s} code {}.\nPress enter to continue.\n", .{ n, v }
+        ) catch {};
+        stdin.reader().skipUntilDelimiterOrEof('\n') catch unreachable;
     }
 }

src/util.zig

@@ -32,8 +32,8 @@ pub fn blocksToSize(b: u64) u64 {
 // Ensure the given arraylist buffer gets zero-terminated and returns a slice
 // into the buffer. The returned buffer is invalidated whenever the arraylist
 // is freed or written to.
-pub fn arrayListBufZ(buf: *std.ArrayListUnmanaged(u8), alloc: std.mem.Allocator) [:0]const u8 {
-    buf.append(alloc, 0) catch unreachable;
+pub fn arrayListBufZ(buf: *std.ArrayList(u8)) [:0]const u8 {
+    buf.append(0) catch unreachable;
     defer buf.items.len -= 1;
     return buf.items[0..buf.items.len-1:0];
 }
@@ -196,44 +196,5 @@ pub fn expanduser(path: []const u8, alloc: std.mem.Allocator) ![:0]u8 {
     const home = std.mem.trimRight(u8, home_raw, "/");
 
     if (home.len == 0 and path.len == len) return alloc.dupeZ(u8, "/");
-    return try std.mem.concatWithSentinel(alloc, u8, &.{ home, path[len..] }, 0);
+    return try std.fmt.allocPrintZ(alloc, "{s}{s}", .{ home, path[len..] });
 }
-
-
-// Silly abstraction to read a file one line at a time. Only exists to help
-// with supporting both Zig 0.14 and 0.15, can be removed once 0.14 support is
-// dropped.
-pub const LineReader = if (@hasDecl(std.io, "bufferedReader")) struct {
-    rd: std.io.BufferedReader(4096, std.fs.File.Reader),
-    fbs: std.io.FixedBufferStream([]u8),
-
-    pub fn init(f: std.fs.File, buf: []u8) @This() {
-        return .{
-            .rd = std.io.bufferedReader(f.reader()),
-            .fbs = std.io.fixedBufferStream(buf),
-        };
-    }
-
-    pub fn read(s: *@This()) !?[]u8 {
-        s.fbs.reset();
-        s.rd.reader().streamUntilDelimiter(s.fbs.writer(), '\n', s.fbs.buffer.len) catch |err| switch (err) {
-            error.EndOfStream => if (s.fbs.getPos() catch unreachable == 0) return null,
-            else => |e| return e,
-        };
-        return s.fbs.getWritten();
-    }
-
-} else struct {
-    rd: std.fs.File.Reader,
-
-    pub fn init(f: std.fs.File, buf: []u8) @This() {
-        return .{ .rd = f.readerStreaming(buf) };
-    }
-
-    pub fn read(s: *@This()) !?[]u8 {
-        return s.rd.interface.takeDelimiterExclusive('\n') catch |err| switch (err) {
-            error.EndOfStream => null,
-            else => |e| return e,
-        };
-    }
-};