Remove useless code and comments.

Makefile

@@ -0,0 +1,30 @@
+all: global-compilation
+
+OPT_CACHE = --global-cache-dir /tmp/.global-cache-dir
+OPT_MODE = ReleaseSmall
+#OPT_MODE = ReleaseFast
+#OPT_MODE = ReleaseSafe
+#OPT_MODE = Debug
+OPT_STRIP = --strip
+opts = -O $(OPT_MODE) $(OPT_CACHE) $(OPT_STRIP)
+
+individual_apps != ls src/*.zig |\
+	grep -v lib.zig |\
+	grep -v zig-cache |\
+	grep -v test.zig |\
+	sed "s_src/__" |\
+	sed "s/.zig$$//"
+
+$(individual_apps):
+	@echo $@
+	@zig build-exe $(opts) src/$@.zig
+
+individual-compilation:
+	@echo "individual apps: $(individual_apps)"
+	@for i in $(individual_apps); do echo "$${i}"; zig build-exe $(opts) src/$${i}.zig; done
+
+global-compilation: src/main.zig
+	zig build-exe $(opts) src/main.zig
+
+
+.PHONY: $(global-compilation) $(individual-compilation)

src/cat.zig

@@ -1,5 +1,5 @@
 const std = @import("std");
-const lib = @import("./lib.zig");
+const stdout = std.io.getStdOut().writer();
 
 pub fn main() anyerror!void {
     const args = try std.process.argsAlloc(std.heap.page_allocator);
@@ -8,34 +8,27 @@ pub fn main() anyerror!void {
         try print_input();
     }
 
-    const files = args[1..];
-    for (files) |f| {
-        if (std.mem.eql(u8, f, "-")) { try print_input(); }
+    for (args[1..]) |f| {
+        if (std.mem.eql(u8, f, "-")) { try print_input();  }
         else                         { try print_file (f); }
     }
 }
 
 fn print_input() !void {
-    const stdin = std.io.getStdIn().reader();
-    var buffer: [4096]u8 = undefined;
-    while (true) {
-        const nbytes = try stdin.read(&buffer);
-        lib.print("{s}", .{buffer[0..nbytes]});
-        if (nbytes == 0) break;
-    }
+    try print_all (std.io.getStdIn());
 }
 
 fn print_file(dest: []const u8) !void {
-    // open file and defer closing
     var file = try std.fs.cwd().openFile(dest, .{ .mode = .read_only });
     defer file.close();
+    try print_all (file);
+}
 
-    // read file content and print everything
+fn print_all(reader: std.fs.File) !void {
     var buffer: [4096]u8 = undefined;
-    var nbytes : u64 = 0;
     while (true) {
-        nbytes = try file.read(&buffer);
-        lib.print("{s}", .{buffer[0..nbytes]});
+        const nbytes = try reader.read(&buffer);
+        try stdout.print("{s}", .{buffer[0..nbytes]});
         if (nbytes == 0) break;
     }
 }

src/cli_arguments.zig

@@ -1,6 +0,0 @@
-
-pub fn nextArg(args: [][]const u8, idx: *usize) ?[]const u8 {
-    if (idx.* >= args.len) return null;
-    defer idx.* += 1;
-    return args[idx.*];
-}

src/lib.zig

@@ -2,15 +2,46 @@ const std   = @import("std");
 const mem   = std.mem;
 const stdout = std.io.getStdOut().writer();
 const process = std.process;
-
+const fmt = std.fmt;
 const fs = std.fs;
+const io = std.io;
 
 pub const warn  = std.debug.print;
 pub fn print(comptime format: []const u8, args: anytype) void {
     nosuspend stdout.print(format, args) catch return;
 }
 
-const cli_arguments = @import("./cli_arguments.zig");
+// const depth = 3;
+
+pub const FixedBufferWriter = struct {
+    const Self = @This();
+
+    depth: u32 = 3,
+    fbs: io.FixedBufferStream([]u8),
+    fmtopts: fmt.FormatOptions = fmt.FormatOptions{},
+
+    pub fn put(self: *Self, str: []const u8) !void {
+        var writer = self.fbs.writer();
+        try fmt.formatType(str, "s", self.fmtopts, writer, self.depth);
+    }
+
+    pub fn putf(self: *Self, comptime format: []const u8, args: anytype) !void {
+        var writer = self.fbs.writer();
+        try fmt.format(writer, format, args);
+    }
+
+    pub fn init(buffer: []u8) Self {
+        return Self{
+            .fbs = io.fixedBufferStream(buffer),
+        };
+    }
+
+    pub fn getWritten(self: *Self) []u8 {
+        defer self.fbs.reset();
+        return self.fbs.getWritten();
+    }
+};
+
 
 pub const CLI = struct {
     const Self = @This();

src/ls.zig

@@ -1,23 +1,124 @@
 const std = @import("std");
+const os = std.os;
+const builtin = @import("builtin");
+const path = std.fs.path;
 const fs = std.fs;
 const lib = @import("./lib.zig");
 
+const fmt = std.fmt;
+
+const Kind = std.fs.File.Kind;
+const PermissionsUnix = std.fs.File.PermissionsUnix;
+
 // WON'T: human output => use human command instead
 // TODO: error management.
-// TODO: verbose output (-l).
 
 pub const cwd = fs.cwd();
 
-// Either print directory's content or file.
-fn print_element(path: []const u8) !void {
-    var dir: fs.Dir = cwd.openDir(path, .{.iterate = true}) catch |err| switch (err) {
-        error.NotDir => return lib.print("{s}\n", .{path}),
+const Options = struct {
+    verbose: bool = false,
+};
+
+var options: Options = Options {};
+
+fn print_stats(fpath: []const u8, stats: os.system.Stat) !void {
+    var buffer = [_]u8 {0} ** (std.fs.MAX_PATH_BYTES + 100);
+    var writer = lib.FixedBufferWriter.init(&buffer);
+
+    // print kind (directory, file, pipe, etc.)
+    const kind = fs.File.Stat.systemStatKindToFsKind(stats);
+    switch (kind) {
+        .File             => try writer.put("-"),
+        .Directory        => try writer.put("d"),
+        .CharacterDevice  => try writer.put("c"),
+        .BlockDevice      => try writer.put("b"),
+        .NamedPipe        => try writer.put("p"),
+        .SymLink          => try writer.put("s"),
+        .UnixDomainSocket => try writer.put("s"),
+        else              => {
+            if (builtin.os.tag == .solaris) switch (kind) {
+                .Door      => try writer.put("D"), // TODO: what to print here?
+                .EventPort => try writer.put("e"), // TODO: what to print here?
+                else       => try writer.put("?"),
+            };
+        },
+    }
+
+    // print rights
+    const perms = PermissionsUnix.unixNew(stats.mode);
+    const classes = [_]PermissionsUnix.Class {
+        PermissionsUnix.Class.user,
+        PermissionsUnix.Class.group,
+        PermissionsUnix.Class.other
+    };
+    const rights = [_]PermissionsUnix.Permission {
+        PermissionsUnix.Permission.read,
+        PermissionsUnix.Permission.write,
+        PermissionsUnix.Permission.execute
+    };
+    for (classes) |c| {
+        for (rights) |r| {
+             if (perms.unixHas(c,r)) {
+                 switch(r) {
+                     .read    => try writer.put("r"),
+                     .write   => try writer.put("w"),
+                     .execute => try writer.put("x"),
+                 }
+             }
+             else {
+                 try writer.put("-");
+             }
+        }
+    }
+
+    // TODO: print user & group, not just uid and gid
+    try writer.putf("\t{}\t{}\t", .{stats.uid, stats.gid});
+    try writer.putf("{}\t",       .{stats.size});
+    try writer.putf("{}\t",       .{stats.mtim.tv_sec});
+    try writer.putf("{s}\n",      .{fpath});
+
+    return lib.print("{s}", .{writer.getWritten()});
+}
+
+fn print_file (fpath: []const u8) !void {
+    if (options.verbose == false) {
+        return lib.print("{s}\n", .{fpath});
+    }
+
+    const dname = path.dirname(fpath);
+    var dpath = dname orelse ".";
+    var dir: fs.Dir = cwd.openDir(dpath, .{}) catch |err| switch (err) {
+        error.AccessDenied => return lib.print("{s}: access denied\n", .{dname}),
         else => return err,
     };
-    var dir_it = dir.iterate();
 
+    const bname = path.basename(fpath);
+    try print_file_in_dir (dir, bname);
+}
+
+fn print_file_in_dir (dir: fs.Dir, entryname: []const u8) !void {
+    if (options.verbose == false) {
+        return lib.print("{s}\n", .{entryname});
+    }
+
+    return try print_stats (entryname, try dir.fstatat(entryname));
+}
+
+// Either print directory's content or file.
+fn print_directory(fpath: []const u8) !void {
+    var dir: fs.Dir = cwd.openDir(fpath, .{.iterate = true}) catch |err| switch (err) {
+        error.AccessDenied => return lib.print("{s}: access denied\n", .{fpath}),
+        error.NotDir => {
+            // fpath is a simple file, just print the file infos
+            return try print_file(fpath);
+        },
+        else => return err,
+    };
+
+    // fpath is a directory: print info on each file
+    var dir_it = dir.iterate();
     while (try dir_it.next()) |entry| {
-        lib.print("{s}\n", .{entry.name});
+        try print_file_in_dir (dir, entry.name);
     }
 }
 
@@ -27,6 +128,7 @@ pub fn ls() !void {
 
     // Skipping the executable binary name.
     var arg_idx: usize = 1;
+    var nb_parameters: i32 = 0;
 
     // case there are parameters
     while(arg_idx < cli.args.len) {
@@ -34,12 +136,18 @@ pub fn ls() !void {
             lib.warn("Null argument\n", .{});
             return error.InvalidArgs;
         };
-        try print_element(element);
+        if (std.mem.eql(u8, element, "-l")) {
+            options.verbose = true;
+        }
+        else {
+            nb_parameters += 1;
+            try print_directory(element);
+        }
     }
 
     // case there were no parameter, print current directory
-    if (cli.args.len == 1) {
-        try print_element(".");
+    if (nb_parameters == 0) {
+        try print_directory(".");
     }
 }
 

src/main.zig

@@ -0,0 +1,30 @@
+const std = @import("std");
+const eq = std.mem.eql;
+
+const ls = @import("ls.zig");
+const cat = @import("cat.zig");
+
+const lib = @import("lib.zig");
+
+fn help() void {
+    const help_string =
+      \\
+      \\ toying with a single tool: zig build-exe ls.zig
+      \\ (currently ± working tools: cat, ls)
+      \\
+      \\ global compilation: zig build-exe main.zig
+      \\   -> produces "main" that includes all tools
+      \\      you can invoke each tool by creating a symbolic link to "main"
+      \\      ex: ln -s main ls   <- now you have "ls" working as your well-known "ls" :)
+    ;
+    lib.print("{s}\n", .{help_string});
+}
+
+pub fn main() !void {
+    const args = try std.process.argsAlloc(std.heap.page_allocator);
+    const bname = std.fs.path.basename(args[0]);
+
+    if      (eq(u8, bname, "ls"))  { try ls.main();  }
+    else if (eq(u8, bname, "cat")) { try cat.main(); }
+    else                           { help();         }
+}

src/test.zig

@@ -0,0 +1,26 @@
+const std = @import("std");
+const path = std.fs.path;
+const lib = @import("./lib.zig");
+const fmt = std.fmt;
+
+const default_max_depth = 3;
+
+test "print type" {
+    lib.print("hello\n", .{});
+
+    var buffer = [_]u8{0} ** 3;
+    const T = @TypeOf(std.io.fixedBufferStream(&buffer));
+    lib.print("hello: {}\n", .{T});
+}
+
+test "buffer stuff" {
+    var buffer = [_]u8 {0} ** (std.fs.MAX_PATH_BYTES + 100);
+    var fbs = std.io.fixedBufferStream(&buffer);
+
+    var writer = fbs.writer();
+    try fmt.formatType('W',      "c", fmt.FormatOptions{}, writer, default_max_depth);
+    try fmt.formatType("ritten", "s", fmt.FormatOptions{}, writer, default_max_depth);
+
+    lib.print("{s}\n", .{fbs.getWritten()});
+    fbs.reset();
+}