zigを勉強してるwebﾌﾛﾝﾄｴﾝﾄﾞｴﾝｼﾞﾆｱのメモ

unable to find zig installation directory: FileNotFound

const std = @import("std");

pub fn main() !void {
    const args: ([][*:0]u8) = std.os.argv;
    const stdout = std.io.getStdOut().writer();
    const first_arg: [*:0]u8 = args[1];

    // zig run src/main.zig -- aaaa
    // output: aaaa
    try stdout.print("{s}\n", .{first_arg});
}

const std = @import("std");

// https://github.com/ziglang/zig/blob/master/test/behavior/const_slice_child.zig#L37-L41
fn strlen(ptr: [*]const u8) usize {
    var count: usize = 0;
    while (ptr[count] != 0) : (count += 1) {}
    return count;
}
pub fn main() !void {
    // コマンドライン引数を読み取る
    const args: ([][*:0]u8) = std.os.argv;
    // 最初の引数
    const first_arg = args[1];

    // convert [*:0]u8 to []u8
    const first_arg_slice = first_arg[0..strlen(first_arg)];
   // fileの内容を取得する
    var file = try std.fs.cwd().openFile(first_arg_slice, .{});
    defer file.close();

    // fileのバイナリを格納する変数
    var buf: [1024]u8 = undefined;
    // ファイルの内容を変数に書き込む
    _ = try file.read(&buf);

    var stdout = std.io.getStdOut().writer();
    // printする
    try stdout.print("{d}", .{buf});
}

const std = @import("std");

fn strlen(ptr: [*]const u8) usize {
    var count: usize = 0;
    while (ptr[count] != 0) : (count += 1) {}
    return count;
}
pub fn main() !void {
    const args: ([][*:0]u8) = std.os.argv;
    const first_arg = args[1];

    // convert [*:0]u8 to []u8
    const first_arg_slice = first_arg[0..strlen(first_arg)];
    var file = try @embedFile(first_arg_slice);

    const stdout = std.io.getStdOut().writer();
    try stdout.print("{d}", .{file});
}

❯ zig run src/main.zig -- src/feaf.png
src/main.zig:14:31: error: unable to resolve comptime value
    var file = try @embedFile(first_arg_slice);
                              ^~~~~~~~~~~~~~~
src/main.zig:14:31: note: file path name must be comptime-known
referenced by:
    callMain: /usr/local/zig/lib/std/start.zig:608:32
    initEventLoopAndCallMain: /usr/local/zig/lib/std/start.zig:542:34
    remaining reference traces hidden; use '-freference-trace' to see all reference traces

const std = @import("std");
const testing = std.testing;
const Arraylist = std.ArrayList;
const allocator = std.mem.Allocator;

// javascript map function
export fn map(array: anytype, callback: fn (elem: anytype) type) void {
    var list = Arraylist(type).init(allocator);

    for (array) |elem| {
        var result = callback(elem);
        try list.addOne(result);
    }
    return list;
}

src/main.zig:7:15: error: generic parameters not allowed in function with calling convention 'C'
export fn map(array: anytype, callback: fn (elem: anytype) type) void {