117 行
3.8 KiB
Zig
117 行
3.8 KiB
Zig
const std = @import("std");
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const fs = std.fs;
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const io = std.io;
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const version = @import("version.zig");
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fn help() !void {
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const stdof = io.getStdOut().writer();
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var bw = io.bufferedWriter(stdof);
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const stdout = bw.writer();
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try stdout.print("076 coreutils\n", .{});
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try stdout.print("使用法: cat [オプション]... [ファイル]...\n", .{});
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try stdout.print("ファイル (複数可) の内容を結合して標準出力に出力します。\n\n", .{});
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try stdout.print("ファイルの指定がない場合や FILE が - の場合, 標準入力から読み込みを行います。\n\n", .{});
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try stdout.print("-b カッコの行列以外、全ての行に行番号を付ける\n", .{});
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try stdout.print("-d 全部は１行列に表示する\n", .{});
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try stdout.print("-n 全ての行に行番号を付ける\n", .{});
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try stdout.print("-s カッコの行列を見逃す\n", .{});
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try stdout.print("-u 不使用\n", .{});
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try stdout.print("-h ヘルプを表示\n", .{});
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try stdout.print("-v バージョンを表示\n", .{});
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try bw.flush();
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}
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pub fn main() !void {
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer _ = gpa.deinit();
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const alloc = gpa.allocator();
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var option = std.ArrayList(u8).init(alloc);
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defer option.deinit();
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var fname = std.ArrayList([]const u8).init(alloc);
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defer fname.deinit();
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const args = try std.process.argsAlloc(alloc);
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defer std.process.argsFree(alloc, args);
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for (args, 0..) |arg, i| {
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if (i == 0) continue;
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var m: [1]u8 = [_]u8{'-'};
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if (std.mem.eql(u8, arg[0..1], m[0..])) {
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for (arg, 0..) |a, j| {
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if (j == 0) continue;
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try option.append(a);
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}
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} else {
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try fname.append(arg);
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}
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}
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var isnun: bool = false;
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var iscol: bool = false;
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var isone: bool = false;
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var isnum: bool = false;
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var issqz: bool = false;
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var line_number: usize = 0;
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for (option.items) |i| {
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if (i == 'h') {
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try help();
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return;
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}
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if (i == 'v') {
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try version.ver("cat");
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return;
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}
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if (i == 'b') isnun = true;
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if (i == 'c') iscol = true;
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if (i == 'd') isone = true;
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if (i == 'n') isnum = true;
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if (i == 's') issqz = true;
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}
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if (fname.items.len == 0) {
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const stdin = io.getStdIn().reader();
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var buf: [2048]u8 = undefined;
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while (true) {
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const lne = try stdin.read(buf[0..]);
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if (lne == 0) {
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break;
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}
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try io.getStdOut().writer().writeAll(buf[0..lne]);
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}
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} else {
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for (fname.items) |item| {
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const file = try fs.cwd().openFile(item, .{});
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defer file.close();
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var buf: [1024]u8 = undefined;
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while (true) {
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const result = try file.reader().readUntilDelimiterOrEof(buf[0..], '\n') orelse break;
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if (issqz and std.mem.trimRight(u8, result, "\n\r").len == 0) continue;
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const stripped = std.mem.trim(u8, result, " \n\t\r");
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if (isone) {
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try io.getStdOut().writer().writeAll(stripped);
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} else {
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if (isnum or (isnun and stripped.len != 0)) {
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line_number += 1;
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try io.getStdOut().writer().print(" {:3} | ", .{line_number});
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} else if (isnum) {
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line_number += 1;
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try io.getStdOut().writer().print(" {:3} | ", .{line_number});
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}
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try io.getStdOut().writer().writeAll(result);
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try io.getStdOut().writer().print("\n", .{});
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}
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}
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}
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}
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}
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