common: remove support for positional arguments
This is currently unused and I don't like the approach anymore regardless. If/when we need positional arguments (probably when implementing the upcoming river-control protocol in rivertile) they should be handled separately from flags. This commit also improves the CLI error reporting to always print the usage string if invalid arguments were passed.
This commit is contained in:
Isaac Freund
126
common/args.zig
126
common/args.zig
@ -1,126 +0,0 @@
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// This file is part of river, a dynamic tiling wayland compositor.
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//
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// Copyright 2021 The River Developers
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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const std = @import("std");
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const mem = std.mem;
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const cstr = std.cstr;
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const root = @import("root");
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pub const FlagDef = struct {
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name: [*:0]const u8,
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kind: enum { boolean, arg },
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};
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pub fn Args(comptime num_positionals: comptime_int, comptime flag_defs: []const FlagDef) type {
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return struct {
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const Self = @This();
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positionals: [num_positionals][*:0]const u8,
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flags: [flag_defs.len]struct {
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name: [*:0]const u8,
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value: union {
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boolean: bool,
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arg: ?[*:0]const u8,
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},
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},
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pub fn parse(argv: [][*:0]const u8) Self {
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var ret: Self = undefined;
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// Init all flags in the flags array to false/null
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inline for (flag_defs) |flag_def, flag_idx| {
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switch (flag_def.kind) {
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.boolean => ret.flags[flag_idx] = .{
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.name = flag_def.name,
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.value = .{ .boolean = false },
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},
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.arg => ret.flags[flag_idx] = .{
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.name = flag_def.name,
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.value = .{ .arg = null },
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},
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}
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}
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// Parse the argv in to the positionals and flags arrays
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var arg_idx: usize = 0;
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var positional_idx: usize = 0;
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outer: while (arg_idx < argv.len) : (arg_idx += 1) {
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var should_continue = false;
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inline for (flag_defs) |flag_def, flag_idx| {
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if (cstr.cmp(flag_def.name, argv[arg_idx]) == 0) {
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switch (flag_def.kind) {
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.boolean => ret.flags[flag_idx].value.boolean = true,
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.arg => {
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arg_idx += 1;
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ret.flags[flag_idx].value.arg = if (arg_idx < argv.len)
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argv[arg_idx]
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else
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root.fatal("flag '" ++ flag_def.name ++
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"' requires an argument but none was provided!", .{});
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},
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}
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// TODO: this variable exists as a workaround for the fact that
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// using continue :outer here crashes the stage1 compiler.
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should_continue = true;
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}
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}
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if (should_continue) continue;
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if (positional_idx == num_positionals) {
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root.fatal(
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"{} positional arguments expected but more were provided!",
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.{num_positionals},
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);
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}
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// This check should not be needed as this code is unreachable
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// if num_positionals is 0. Howevere the stage1 zig compiler does
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// not seem to be smart enough to realize this.
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if (num_positionals > 0) {
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ret.positionals[positional_idx] = argv[arg_idx];
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} else {
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unreachable;
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}
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positional_idx += 1;
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}
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if (positional_idx < num_positionals) {
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root.fatal(
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"{} positional arguments expected but only {} were provided!",
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.{ num_positionals, positional_idx },
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);
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}
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return ret;
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}
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pub fn boolFlag(self: Self, flag_name: [*:0]const u8) bool {
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for (self.flags) |flag| {
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if (cstr.cmp(flag.name, flag_name) == 0) return flag.value.boolean;
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}
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unreachable; // Invalid flag_name
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}
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pub fn argFlag(self: Self, flag_name: [*:0]const u8) ?[*:0]const u8 {
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for (self.flags) |flag| {
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if (cstr.cmp(flag.name, flag_name) == 0) return flag.value.arg;
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}
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unreachable; // Invalid flag_name
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}
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};
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}
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104
common/flags.zig
Normal file
104
common/flags.zig
Normal file
@ -0,0 +1,104 @@
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// This file is part of river, a dynamic tiling wayland compositor.
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//
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// Copyright 2021 The River Developers
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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const std = @import("std");
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const cstr = std.cstr;
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pub const Flag = struct {
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name: [*:0]const u8,
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kind: enum { boolean, arg },
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};
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pub fn ParseResult(comptime flags: []const Flag) type {
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return struct {
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const Self = @This();
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const FlagData = struct {
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name: [*:0]const u8,
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value: union {
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boolean: bool,
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arg: ?[*:0]const u8,
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},
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};
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/// Remaining args after the recognized flags
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args: [][*:0]const u8,
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/// Data obtained from parsed flags
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flag_data: [flags.len]FlagData = blk: {
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// Init all flags to false/null
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var flag_data: [flags.len]FlagData = undefined;
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inline for (flags) |flag, i| {
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flag_data[i] = switch (flag.kind) {
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.boolean => .{
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.name = flag.name,
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.value = .{ .boolean = false },
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},
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.arg => .{
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.name = flag.name,
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.value = .{ .arg = null },
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},
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};
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}
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break :blk flag_data;
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},
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pub fn boolFlag(self: Self, flag_name: [*:0]const u8) bool {
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for (self.flag_data) |flag_data| {
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if (cstr.cmp(flag_data.name, flag_name) == 0) return flag_data.value.boolean;
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}
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unreachable; // Invalid flag_name
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}
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pub fn argFlag(self: Self, flag_name: [*:0]const u8) ?[*:0]const u8 {
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for (self.flag_data) |flag_data| {
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if (cstr.cmp(flag_data.name, flag_name) == 0) return flag_data.value.arg;
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}
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unreachable; // Invalid flag_name
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}
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};
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}
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pub fn parse(args: [][*:0]const u8, comptime flags: []const Flag) !ParseResult(flags) {
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var ret: ParseResult(flags) = .{ .args = undefined };
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var arg_idx: usize = 0;
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while (arg_idx < args.len) : (arg_idx += 1) {
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var parsed_flag = false;
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inline for (flags) |flag, flag_idx| {
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if (cstr.cmp(flag.name, args[arg_idx]) == 0) {
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switch (flag.kind) {
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.boolean => ret.flag_data[flag_idx].value.boolean = true,
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.arg => {
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arg_idx += 1;
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if (arg_idx == args.len) {
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std.log.err("flag '" ++ flag.name ++
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"' requires an argument but none was provided!", .{});
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return error.MissingFlagArgument;
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}
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ret.flag_data[flag_idx].value.arg = args[arg_idx];
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},
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}
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parsed_flag = true;
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}
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}
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if (!parsed_flag) break;
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}
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ret.args = args[arg_idx..];
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return ret;
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}
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