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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");
fn freeArgv(allocator: std.mem.Allocator, argv: []const []const u8) void {
// argv[0] is cmd_name (not allocated), argv[1..] are allocated by parseArgs
for (argv[1..]) |arg| allocator.free(arg);
allocator.free(argv);
}
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,
history_list: []const []const u8,
) !builtins.CommandResult {
if (std.mem.eql(u8, cmd_name, "exit")) return builtins.executeExit();
if (std.mem.eql(u8, cmd_name, "history")) {
try builtins.executeHistory(stdout, history_list);
return .continue_loop;
}
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 {
for (argv[1..]) |arg| allocator.free(arg);
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,
commands: []const []const u8,
) !builtins.CommandResult {
var stages = std.ArrayList(executor.Stage){};
defer stages.deinit(allocator);
var owned_paths = std.ArrayList(?[]const u8){};
defer {
for (owned_paths.items) |p| if (p) |path_buf| allocator.free(path_buf);
owned_paths.deinit(allocator);
}
var owned_argvs = std.ArrayList(?[]const []const u8){};
defer {
for (owned_argvs.items) |argv_opt| if (argv_opt) |argv| freeArgv(allocator, argv);
owned_argvs.deinit(allocator);
}
for (commands) |cmd_part| {
const parsed = parser.parseCommand(cmd_part);
if (parsed.name.len == 0) {
try stdout.print("{s}: command not found\n", .{cmd_part});
return .continue_loop;
}
const is_builtin = builtins.isBuiltin(parsed.name);
var cmd_path: ?[]const u8 = null;
if (!is_builtin) {
cmd_path = try path.findInPath(allocator, parsed.name);
}
if (!is_builtin and cmd_path == null) {
try stdout.print("{s}: command not found\n", .{parsed.name});
return .continue_loop;
}
try owned_paths.append(allocator, cmd_path);
var argv: ?[]const []const u8 = null;
if (!is_builtin) {
argv = try parser.parseArgs(allocator, parsed.name, parsed.args);
}
try owned_argvs.append(allocator, argv);
try stages.append(allocator, .{
.is_builtin = is_builtin,
.name = parsed.name,
.args = parsed.args,
.path = cmd_path,
.argv = argv,
});
}
try executor.runPipeline(allocator, stages.items);
return .continue_loop;
}
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