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Merge pull request #59 from AtkinsSJ/errno-builtin
Add `errno` utility, which prints out error codes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| * Copyright (C) 2024 Puter Technologies Inc. | ||
| * | ||
| * This file is part of Phoenix Shell. | ||
| * | ||
| * Phoenix Shell is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Affero General Public License as published | ||
| * by the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * This program is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Affero General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Affero General Public License | ||
| * along with this program. If not, see <https://www.gnu.org/licenses/>. | ||
| */ | ||
| import { ErrorCodes, ErrorMetadata, errorFromIntegerCode } from '../../platform/PosixError.js'; | ||
| import { Exit } from './coreutil_lib/exit.js'; | ||
|
|
||
| const maxErrorNameLength = Object.keys(ErrorCodes) | ||
| .reduce((longest, name) => Math.max(longest, name.length), 0); | ||
| const maxNumberLength = 3; | ||
|
|
||
| async function printSingleErrno(errorCode, out) { | ||
| const metadata = ErrorMetadata.get(errorCode); | ||
| const paddedName = errorCode.description + ' '.repeat(maxErrorNameLength - errorCode.description.length); | ||
| const code = metadata.code.toString(); | ||
| const paddedCode = ' '.repeat(maxNumberLength - code.length) + code; | ||
| await out.write(`${paddedName} ${paddedCode} ${metadata.description}\n`); | ||
| } | ||
|
|
||
| export default { | ||
| name: 'errno', | ||
| usage: 'errno [OPTIONS] [NAME-OR-CODE...]', | ||
| description: 'Look up and describe errno codes.', | ||
| args: { | ||
| $: 'simple-parser', | ||
| allowPositionals: true, | ||
| options: { | ||
| list: { | ||
| description: 'List all errno values', | ||
| type: 'boolean', | ||
| short: 'l' | ||
| }, | ||
| search: { | ||
| description: 'Search for errors whose descriptions contain NAME-OR-CODEs, case-insensitively', | ||
| type: 'boolean', | ||
| short: 's' | ||
| } | ||
| } | ||
| }, | ||
| execute: async ctx => { | ||
| const { err, out } = ctx.externs; | ||
| const { positionals, values } = ctx.locals; | ||
|
|
||
| if (values.search) { | ||
| for (const [errorCode, metadata] of ErrorMetadata) { | ||
| const description = metadata.description.toLowerCase(); | ||
| let matches = true; | ||
| for (const nameOrCode of positionals) { | ||
| if (! description.includes(nameOrCode.toLowerCase())) { | ||
| matches = false; | ||
| break; | ||
| } | ||
| } | ||
| if (matches) { | ||
| await printSingleErrno(errorCode, out); | ||
| } | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| if (values.list) { | ||
| for (const errorCode of ErrorMetadata.keys()) { | ||
| await printSingleErrno(errorCode, out); | ||
| } | ||
| return; | ||
| } | ||
|
|
||
| let failedToMatchSomething = false; | ||
| const fail = async (nameOrCode) => { | ||
| await err.write(`ERROR: Not understood: ${nameOrCode}\n`); | ||
| failedToMatchSomething = true; | ||
| }; | ||
|
|
||
| for (const nameOrCode of positionals) { | ||
| let errorCode = ErrorCodes[nameOrCode.toUpperCase()]; | ||
| if (errorCode) { | ||
| await printSingleErrno(errorCode, out); | ||
| continue; | ||
| } | ||
|
|
||
| const code = Number.parseInt(nameOrCode); | ||
| if (!isFinite(code)) { | ||
| await fail(nameOrCode); | ||
| continue; | ||
| } | ||
| errorCode = errorFromIntegerCode(code); | ||
| if (errorCode) { | ||
| await printSingleErrno(errorCode, out); | ||
| continue; | ||
| } | ||
|
|
||
| await fail(nameOrCode); | ||
| } | ||
|
|
||
| if (failedToMatchSomething) { | ||
| throw new Exit(1); | ||
| } | ||
| } | ||
| }; |
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