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const std = @import("std");
const assert = std.debug.assert;
const cli = @import("cli.zig");
const fs = @import("fs.zig");
const conf = @import("conf.zig");
const Env = @import("env.zig");
const fatal = @import("cli.zig").fatal;
pub const Exec_Args = struct {
env: Env,
argv: []const []const u8,
cwd: ?fs.Path = null,
};
pub const Exec_Result = union(enum) {
success: []const u8,
failure: []const u8,
};
pub fn exec(args: Exec_Args) Exec_Result {
assert(args.argv.len > 0);
const res = std.process.Child.run(.{
.allocator = args.env.allocator,
.argv = args.argv,
.cwd = if (args.cwd) |cwd| cwd.name() else null,
.cwd_dir = if (args.cwd == null) std.fs.cwd() else null,
}) catch |err| {
fatal("error executing {s}: {s}", .{ args.argv[0], @errorName(err) });
};
switch (res.term) {
.Exited => |code| {
if (code == 0) {
args.env.dealloc(res.stderr);
return .{ .success = res.stdout };
} else if (res.stderr.len > 0) {
args.env.dealloc(res.stdout);
return .{ .failure = res.stderr };
} else {
args.env.dealloc(res.stderr);
return .{ .failure = res.stdout };
}
},
.Signal => fatal("signal received executing {s}", .{args.argv[0]}),
.Stopped => fatal("stopped executing {s}", .{args.argv[0]}),
.Unknown => fatal("unknown error executing {s}", .{args.argv[0]}),
}
}
pub fn run(args: Exec_Args) void {
assert(args.argv.len > 0);
var child = std.process.Child.init(args.argv, args.env.allocator);
if (args.cwd) |cwd| child.cwd = cwd.name();
child.cwd_dir = if (args.cwd == null) std.fs.cwd() else null;
child.spawn() catch |err| {
fatal("error executing {s}: {s}", .{ args.argv[0], @errorName(err) });
};
errdefer _ = child.kill() catch {};
const term = child.wait() catch |err| {
fatal("error waiting for {s}: {s}", .{ args.argv[0], @errorName(err) });
};
switch (term) {
.Exited => |code| if (code != 0) std.process.exit(code),
.Signal => fatal("signal received executing {s}", .{args.argv[0]}),
.Stopped => fatal("stopped executing {s}", .{args.argv[0]}),
.Unknown => fatal("unknown error executing {s}", .{args.argv[0]}),
}
}
pub fn edit_config_file(env: Env, file: fs.Path, comptime verify: fn (env: Env, vars: conf.Config) bool) !void {
const tmp_file = tmp_edit_file(env, file);
fs.cp_file(file, tmp_file) catch |err| {
switch (err) {
error.FileNotFound => try fs.touch(tmp_file),
else => return err,
}
};
edit: while (true) {
const vars: ?conf.Config = parse: while (true) {
try exec_editor(env, tmp_file);
const parsed = try conf.Config.from_file(env.allocator, file.name());
switch (parsed) {
.conf => |c| break :parse c,
.err => |e| {
env.err("{s} (line {d})", .{ e.msg, e.line });
switch (ask_edit_again()) {
.again => continue,
.cancel => break :parse null,
}
},
}
};
if (vars) |v| {
defer v.deinit();
if (verify(env, v)) {
try fs.mv_file(tmp_file, file);
return;
}
switch (ask_edit_again()) {
.again => continue,
.cancel => break :edit,
}
} else {
break :edit;
}
}
try fs.rm(tmp_file);
}
pub fn edit_config_file_noverify(env: Env, file: fs.Path) !void {
try edit_config_file(env, file, struct {
fn noverify(_: Env, _: conf.Config) bool {
return true;
}
}.noverify);
}
fn ask_edit_again() enum { again, cancel } {
while (true) {
var again_buf: [16]u8 = undefined;
const again = cli.ask("Edit again? (yes/no) [yes] ", .{}, &again_buf) orelse "yes";
for (again, 0..) |c, i| again_buf[i] = std.ascii.toLower(c);
if (std.mem.eql(u8, again, "y") or std.mem.eql(u8, again, "yes")) {
return .again;
}
if (std.mem.eql(u8, again, "n") or std.mem.eql(u8, again, "no")) {
cli.stderr.print_line("cancelled (changes discarded)", .{});
cli.stderr.flush();
return .cancel;
}
}
}
fn exec_editor(env: Env, file: fs.Path) !void {
const pid = std.posix.fork() catch |err| {
fatal("cannot fork editor: {s}", .{@errorName(err)});
};
if (pid == 0) {
// editor process
var editor_env: [512:null]?[*:0]const u8 = undefined;
var editor_envlen: usize = 0;
const environ = if (std.os.environ.len < 512) std.os.environ else std.os.environ[0..511];
for (environ) |e| {
editor_env[editor_envlen] = e;
editor_envlen += 1;
}
editor_env[editor_envlen] = null;
var configured_editor_buf: [std.fs.max_path_bytes]u8 = undefined;
var configured_editor: ?[:0]u8 = null;
if (env.editor_cmd) |cmd| {
@memcpy(configured_editor_buf[0..cmd.len], cmd);
configured_editor_buf[cmd.len] = 0;
configured_editor = configured_editor_buf[0..cmd.len :0];
}
const editor = configured_editor orelse std.posix.getenv("VISUAL") orelse std.posix.getenv("EDITOR") orelse "vi";
const editor_argv: [*:null]const ?[*:0]const u8 = &.{ editor, file.name(), null };
std.posix.execvpeZ(editor_argv[0].?, editor_argv, &editor_env) catch unreachable;
std.process.exit(1);
}
_ = std.posix.waitpid(pid, 0);
}
/// Derive the filename for the temporary file of `file`.
/// The filename is "{relname}.{timestamp}", where `relname` is the relative
/// part of file regarding to etc.
fn tmp_edit_file(env: Env, file: fs.Path) fs.Path {
const relname = file.relname(env.etc_path(.{})).?;
var tmp_filename_buf: [std.fs.max_name_bytes]u8 = undefined;
var tmp_filename_len: usize = 0;
tmp_filename_len += std.fmt.printInt(tmp_filename_buf[tmp_filename_len..], std.time.timestamp(), 16, .lower, .{});
tmp_filename_buf[tmp_filename_len] = '.';
tmp_filename_len += 1;
for (relname) |c| {
tmp_filename_buf[tmp_filename_len] = if (c == std.fs.path.sep) '_' else c;
tmp_filename_len += 1;
}
return env.work_path(.{ "edit", tmp_filename_buf[0..tmp_filename_len] });
}
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