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const std = @import("std");
const parser = @import("parser.zig");
const builtins = @import("builtins.zig");
const path = @import("path.zig");
const executor = @import("executor.zig");
pub fn executeCommand(
allocator: std.mem.Allocator,
stdout: anytype,
cmd_name: []const u8,
args: ?[]const u8,
output_redirect: ?[]const u8,
error_redirect: ?[]const u8,
append_output: ?[]const u8,
append_error: ?[]const u8,
) !builtins.CommandResult {
if (std.mem.eql(u8, cmd_name, "exit")) return builtins.executeExit();
if (std.mem.eql(u8, cmd_name, "echo")) {
if (error_redirect) |file| {
const fd = try std.fs.cwd().createFile(file, .{});
fd.close();
}
if (append_error) |file| {
_ = std.fs.cwd().openFile(file, .{ .mode = .write_only }) catch |err| {
if (err == error.FileNotFound) {
const new_fd = try std.fs.cwd().createFile(file, .{});
new_fd.close();
} else {
return err;
}
};
}
if (output_redirect != null or append_output != null) {
const file = if (output_redirect) |f| f else append_output.?;
const is_append = append_output != null;
const fd = if (is_append) blk: {
break :blk std.fs.cwd().openFile(file, .{ .mode = .write_only }) catch |err| {
if (err == error.FileNotFound) {
break :blk try std.fs.cwd().createFile(file, .{});
}
return err;
};
} else try std.fs.cwd().createFile(file, .{});
defer fd.close();
if (is_append) {
try fd.seekFromEnd(0);
}
if (args) |a| {
var i: usize = 0;
var in_quote = false;
var quote_char: u8 = 0;
var unquoted = std.ArrayList(u8){};
defer unquoted.deinit(allocator);
var last_was_space = false;
while (i < a.len) : (i += 1) {
if (!in_quote and a[i] == '\\' and i + 1 < a.len) {
i += 1;
_ = unquoted.append(allocator, a[i]) catch {};
last_was_space = false;
} else if (!in_quote and (a[i] == '\'' or a[i] == '"')) {
in_quote = true;
quote_char = a[i];
last_was_space = false;
} else if (in_quote and a[i] == quote_char) {
in_quote = false;
last_was_space = false;
} else if (in_quote and quote_char == '"' and a[i] == '\\' and i + 1 < a.len) {
const next = a[i + 1];
if (next == '"' or next == '\\') {
i += 1;
_ = unquoted.append(allocator, a[i]) catch {};
} else {
_ = unquoted.append(allocator, a[i]) catch {};
}
last_was_space = false;
} else if (!in_quote and a[i] == ' ') {
if (!last_was_space) {
_ = unquoted.append(allocator, ' ') catch {};
last_was_space = true;
}
} else {
_ = unquoted.append(allocator, a[i]) catch {};
last_was_space = false;
}
}
try fd.writeAll(unquoted.items);
try fd.writeAll("\n");
} else {
try fd.writeAll("\n");
}
} else {
try builtins.executeEcho(stdout, args);
}
return .continue_loop;
}
if (std.mem.eql(u8, cmd_name, "pwd")) {
try builtins.executePwd(allocator, stdout);
return .continue_loop;
}
if (std.mem.eql(u8, cmd_name, "cd")) {
try builtins.executeCd(allocator, stdout, args);
return .continue_loop;
}
if (std.mem.eql(u8, cmd_name, "type")) {
try builtins.executeType(allocator, stdout, args);
return .continue_loop;
}
if (try path.findInPath(allocator, cmd_name)) |program_path| {
defer allocator.free(program_path);
const argv = try parser.parseArgs(allocator, cmd_name, args);
defer allocator.free(argv);
if (output_redirect != null or error_redirect != null or append_output != null or append_error != null) {
try executor.runExternalProgramWithRedirect(allocator, program_path, argv, output_redirect, error_redirect, append_output, append_error);
} else {
try executor.runExternalProgram(allocator, program_path, argv);
}
return .continue_loop;
}
try stdout.print("{s}: command not found\n", .{cmd_name});
return .continue_loop;
}
pub fn executePipeline(
allocator: std.mem.Allocator,
stdout: anytype,
left_cmd: []const u8,
right_cmd: []const u8,
) !builtins.CommandResult {
const left_parsed = parser.parseCommand(left_cmd);
const right_parsed = parser.parseCommand(right_cmd);
if (left_parsed.name.len == 0) {
try stdout.print("{s}: command not found\n", .{left_cmd});
return .continue_loop;
}
if (right_parsed.name.len == 0) {
try stdout.print("{s}: command not found\n", .{right_cmd});
return .continue_loop;
}
const left_is_builtin = builtins.isBuiltin(left_parsed.name);
const right_is_builtin = builtins.isBuiltin(right_parsed.name);
const left_path = if (left_is_builtin) null else try path.findInPath(allocator, left_parsed.name);
defer if (left_path) |p| allocator.free(p);
if (!left_is_builtin and left_path == null) {
try stdout.print("{s}: command not found\n", .{left_parsed.name});
return .continue_loop;
}
const right_path = if (right_is_builtin) null else try path.findInPath(allocator, right_parsed.name);
defer if (right_path) |p| allocator.free(p);
if (!right_is_builtin and right_path == null) {
try stdout.print("{s}: command not found\n", .{right_parsed.name});
return .continue_loop;
}
const left_argv = if (left_is_builtin) null else try parser.parseArgs(allocator, left_parsed.name, left_parsed.args);
defer if (left_argv) |argv| allocator.free(argv);
const right_argv = if (right_is_builtin) null else try parser.parseArgs(allocator, right_parsed.name, right_parsed.args);
defer if (right_argv) |argv| allocator.free(argv);
try executor.runPipeline(
allocator,
left_path,
left_is_builtin,
left_parsed.name,
left_parsed.args,
left_argv,
right_path,
right_is_builtin,
right_parsed.name,
right_parsed.args,
right_argv,
);
return .continue_loop;
}
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