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chromium / external / gitster / git-htmldocs / aedeeaeb2294e47414178658ce93162ff4890da1 / . / technical / api-parse-options.html
blob: e7f62b1ed89545cd5885f5eaff26d3666ceba1ce [file] [log] [blame]
Junio C Hamano944ce252018-05-30 22:25:26[diff] [blame]1<?xml version="1.0" encoding="UTF-8"?>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]2<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
3 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
4<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
5<head>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]6<meta http-equiv="Content-Type" content="application/xhtml+xml; charset=UTF-8" />
Junio C Hamanoa85030a2022-07-27 16:48:21[diff] [blame]7<meta name="generator" content="AsciiDoc 10.2.0" />
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]8<title>parse-options API</title>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]9<style type="text/css">
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]10/* Shared CSS for AsciiDoc xhtml11 and html5 backends */
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]25}
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Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]31a {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]38
39em {
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]41 color: navy;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]42}
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]46 color: #083194;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]47}
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]49h1, h2, h3, h4, h5, h6 {
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Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]56h1, h2, h3 {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]60 padding-top: 0.5em;
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Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]62h3 {
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]68h5 {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]71
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]85ul, ol, li > p {
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]88ul > li { color: #aaa; }
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]90
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]91.monospaced, code, pre {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]95 padding: 0;
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Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]98pre {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]101
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]102#author {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]103 color: #527bbd;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]104 font-weight: bold;
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]105 font-size: 1.1em;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]106}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]107#email {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]108}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]109#revnumber, #revdate, #revremark {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]110}
111
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]112#footer {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]113 font-size: small;
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]118#footer-text {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]119 float: left;
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]122#footer-badges {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]123 float: right;
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]127#preamble {
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]128 margin-top: 1.5em;
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]131div.imageblock, div.exampleblock, div.verseblock,
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]132div.quoteblock, div.literalblock, div.listingblock, div.sidebarblock,
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Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]134 margin-top: 1.0em;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]135 margin-bottom: 1.5em;
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Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]138 margin-top: 2.0em;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]142}
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]150 color: #527bbd;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]151 font-weight: bold;
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]172 border: 1px solid #dddddd;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]174 padding: 0.5em;
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177div.listingblock > div.content {
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]178 border: 1px solid #dddddd;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]181 padding: 0.5em;
182}
183
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]184div.quoteblock, div.verseblock {
185 padding-left: 1.0em;
186 margin-left: 1.0em;
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]187 margin-right: 10%;
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]188 border-left: 5px solid #f0f0f0;
189 color: #888;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]190}
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]191
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]192div.quoteblock > div.attribution {
193 padding-top: 0.5em;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]194 text-align: right;
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]196
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]197div.verseblock > pre.content {
198 font-family: inherit;
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]200}
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Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]206div.verseblock + div.attribution {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]209
210div.admonitionblock .icon {
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Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]220 border-left: 3px solid #dddddd;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]221}
222
223div.exampleblock > div.content {
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]224 border-left: 3px solid #dddddd;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]226}
227
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]228div.imageblock div.content { padding-left: 0; }
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]229span.image img { border-style: none; vertical-align: text-bottom; }
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]230a.image:visited { color: white; }
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]231
232dl {
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]239 font-style: normal;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]241}
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]243 margin-top: 0.1em;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]244}
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246ul, ol {
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]249ol.arabic {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]253 list-style-type: lower-alpha;
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]255ol.upperalpha {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]271
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]272tfoot {
273 font-weight: bold;
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]275td > div.verse {
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]278
279div.hdlist {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]280 margin-top: 0.8em;
281 margin-bottom: 0.8em;
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]283div.hdlist tr {
284 padding-bottom: 15px;
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]285}
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]286dt.hdlist1.strong, td.hdlist1.strong {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]290 vertical-align: top;
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]291 font-style: normal;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]292 padding-right: 0.8em;
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]293 color: navy;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]294}
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]295td.hdlist2 {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]296 vertical-align: top;
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]298div.hdlist.compact tr {
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303.comment {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]306
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]307.footnote, .footnoteref {
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310
311span.footnote, span.footnoteref {
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314
315#footnotes {
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324#footnotes hr {
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]334div.colist td {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]341}
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]342
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]343@media print {
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347#toc {
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]348 margin-bottom: 2.5em;
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350
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]351#toctitle {
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]352 color: #527bbd;
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]353 font-size: 1.1em;
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Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]359div.toclevel0, div.toclevel1, div.toclevel2, div.toclevel3, div.toclevel4 {
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]360 margin-top: 0;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]375
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]376span.aqua { color: aqua; }
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378span.blue { color: blue; }
379span.fuchsia { color: fuchsia; }
380span.gray { color: gray; }
381span.green { color: green; }
382span.lime { color: lime; }
383span.maroon { color: maroon; }
384span.navy { color: navy; }
385span.olive { color: olive; }
386span.purple { color: purple; }
387span.red { color: red; }
388span.silver { color: silver; }
389span.teal { color: teal; }
390span.white { color: white; }
391span.yellow { color: yellow; }
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393span.aqua-background { background: aqua; }
394span.black-background { background: black; }
395span.blue-background { background: blue; }
396span.fuchsia-background { background: fuchsia; }
397span.gray-background { background: gray; }
398span.green-background { background: green; }
399span.lime-background { background: lime; }
400span.maroon-background { background: maroon; }
401span.navy-background { background: navy; }
402span.olive-background { background: olive; }
403span.purple-background { background: purple; }
404span.red-background { background: red; }
405span.silver-background { background: silver; }
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416
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]417div.unbreakable { page-break-inside: avoid; }
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]419
420/*
421 * xhtml11 specific
422 *
423 * */
424
425div.tableblock {
426 margin-top: 1.0em;
427 margin-bottom: 1.5em;
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]428}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]429div.tableblock > table {
430 border: 3px solid #527bbd;
431}
432thead, p.table.header {
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]433 font-weight: bold;
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]434 color: #527bbd;
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436p.table {
437 margin-top: 0;
438}
Junio C Hamano725b0da2020-01-22 22:02:40[diff] [blame]439/* Because the table frame attribute is overridden by CSS in most browsers. */
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]440div.tableblock > table[frame="void"] {
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447div.tableblock > table[frame="vsides"] {
448 border-top-style: none;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]450}
451
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]452
453/*
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457
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469table.tableblock {
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471 border-spacing: 0px;
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473 border-color: #527bbd;
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]481}
482
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]483table.tableblock.frame-topbot {
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487table.tableblock.frame-sides {
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495th.tableblock.halign-left, td.tableblock.halign-left {
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]502 text-align: right;
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504
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]505th.tableblock.valign-top, td.tableblock.valign-top {
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Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]507}
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]508th.tableblock.valign-middle, td.tableblock.valign-middle {
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]513}
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Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]537
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Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]731asciidoc.install();
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Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]734</head>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]735<body class="article">
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]736<div id="header">
737<h1>parse-options API</h1>
Junio C Hamanoaedeeae2023-07-18 15:55:30[diff] [blame^]738<span id="revdate">2023-07-18</span>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]739</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]740<div id="content">
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]741<div id="preamble">
742<div class="sectionbody">
Junio C Hamano076ffcc2013-02-06 05:13:21[diff] [blame]743<div class="paragraph"><p>The parse-options API is used to parse and massage options in Git
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]744and to provide a usage help with consistent look.</p></div>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]745</div>
746</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]747<div class="sect1">
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]748<h2 id="_basics">Basics</h2>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]749<div class="sectionbody">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]750<div class="paragraph"><p>The argument vector <code>argv[]</code> may usually contain mandatory or optional
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]751<em>non-option arguments</em>, e.g. a filename or a branch, <em>options</em>, and
752<em>subcommands</em>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]753Options are optional arguments that start with a dash and
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]754that allow to change the behavior of a command.</p></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]755<div class="ulist"><ul>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]756<li>
757<p>
758There are basically three types of options:
759 <em>boolean</em> options,
760 options with (mandatory) <em>arguments</em> and
761 options with <em>optional arguments</em>
762 (i.e. a boolean option that can be adjusted).
763</p>
764</li>
765<li>
766<p>
767There are basically two forms of options:
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]768 <em>Short options</em> consist of one dash (<code>-</code>) and one alphanumeric
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]769 character.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]770 <em>Long options</em> begin with two dashes (<code>--</code>) and some
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]771 alphanumeric characters.
772</p>
773</li>
774<li>
775<p>
776Options are case-sensitive.
777 Please define <em>lower-case long options</em> only.
778</p>
779</li>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]780</ul></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]781<div class="paragraph"><p>The parse-options API allows:</p></div>
782<div class="ulist"><ul>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]783<li>
784<p>
Junio C Hamanof079f702013-12-06 23:43:18[diff] [blame]785<em>stuck</em> and <em>separate form</em> of options with arguments.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]786 <code>-oArg</code> is stuck, <code>-o Arg</code> is separate form.
787 <code>--option=Arg</code> is stuck, <code>--option Arg</code> is separate form.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]788</p>
789</li>
790<li>
791<p>
792Long options may be <em>abbreviated</em>, as long as the abbreviation
793 is unambiguous.
794</p>
795</li>
796<li>
797<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]798Short options may be bundled, e.g. <code>-a -b</code> can be specified as <code>-ab</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]799</p>
800</li>
801<li>
802<p>
803Boolean long options can be <em>negated</em> (or <em>unset</em>) by prepending
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]804 <code>no-</code>, e.g. <code>--no-abbrev</code> instead of <code>--abbrev</code>. Conversely,
805 options that begin with <code>no-</code> can be <em>negated</em> by removing it.
Junio C Hamanoc7102962013-05-29 23:57:17[diff] [blame]806 Other long options can be unset (e.g., set string to NULL, set
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]807 integer to 0) by prepending <code>no-</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]808</p>
809</li>
810<li>
811<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]812Options and non-option arguments can clearly be separated using the <code>--</code>
813 option, e.g. <code>-a -b --option -- --this-is-a-file</code> indicates that
814 <code>--this-is-a-file</code> must not be processed as an option.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]815</p>
816</li>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]817</ul></div>
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]818<div class="paragraph"><p>Subcommands are special in a couple of ways:</p></div>
819<div class="ulist"><ul>
820<li>
821<p>
822Subcommands only have long form, and they have no double dash prefix, no
823 negated form, and no description, and they don&#8217;t take any arguments, and
824 can&#8217;t be abbreviated.
825</p>
826</li>
827<li>
828<p>
829There must be exactly one subcommand among the arguments, or zero if the
830 command has a default operation mode.
831</p>
832</li>
833<li>
834<p>
835All arguments following the subcommand are considered to be arguments of
836 the subcommand, and, conversely, arguments meant for the subcommand may
Junio C Hamanoa1ee1292022-09-21 22:47:52[diff] [blame]837 not precede the subcommand.
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]838</p>
839</li>
840</ul></div>
841<div class="paragraph"><p>Therefore, if the options array contains at least one subcommand and
842<code>parse_options()</code> encounters the first dashless argument, it will either:</p></div>
843<div class="ulist"><ul>
844<li>
845<p>
846stop and return, if that dashless argument is a known subcommand, setting
847 <code>value</code> to the function pointer associated with that subcommand, storing
848 the name of the subcommand in argv[0], and leaving the rest of the
849 arguments unprocessed, or
850</p>
851</li>
852<li>
853<p>
854stop and return, if it was invoked with the <code>PARSE_OPT_SUBCOMMAND_OPTIONAL</code>
855 flag and that dashless argument doesn&#8217;t match any subcommands, leaving
856 <code>value</code> unchanged and the rest of the arguments unprocessed, or
857</p>
858</li>
859<li>
860<p>
861show error and usage, and abort.
862</p>
863</li>
864</ul></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]865</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]866</div>
867<div class="sect1">
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]868<h2 id="_steps_to_parse_options">Steps to parse options</h2>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]869<div class="sectionbody">
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]870<div class="olist arabic"><ol class="arabic">
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]871<li>
872<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]873<code>#include "parse-options.h"</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]874</p>
875</li>
876<li>
877<p>
878define a NULL-terminated
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]879 <code>static const char * const builtin_foo_usage[]</code> array
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]880 containing alternative usage strings
881</p>
882</li>
883<li>
884<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]885define <code>builtin_foo_options</code> array as described below
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]886 in section <em>Data Structure</em>.
887</p>
888</li>
889<li>
890<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]891in <code>cmd_foo(int argc, const char **argv, const char *prefix)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]892 call
893</p>
894<div class="literalblock">
895<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]896<pre><code>argc = parse_options(argc, argv, prefix, builtin_foo_options, builtin_foo_usage, flags);</code></pre>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]897</div></div>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]898<div class="paragraph"><p><code>parse_options()</code> will filter out the processed options of <code>argv[]</code> and leave the
899non-option arguments in <code>argv[]</code>.
900<code>argc</code> is updated appropriately because of the assignment.</p></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]901<div class="paragraph"><p>You can also pass NULL instead of a usage array as the fifth parameter of
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]902parse_options(), to avoid displaying a help screen with usage info and
903option list. This should only be done if necessary, e.g. to implement
904a limited parser for only a subset of the options that needs to be run
905before the full parser, which in turn shows the full help message.</p></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]906<div class="paragraph"><p>Flags are the bitwise-or of:</p></div>
907<div class="dlist"><dl>
908<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]909<code>PARSE_OPT_KEEP_DASHDASH</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]910</dt>
911<dd>
912<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]913 Keep the <code>--</code> that usually separates options from
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]914 non-option arguments.
915</p>
916</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]917<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]918<code>PARSE_OPT_STOP_AT_NON_OPTION</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]919</dt>
920<dd>
921<p>
922 Usually the whole argument vector is massaged and reordered.
923 Using this flag, processing is stopped at the first non-option
924 argument.
925</p>
926</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]927<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]928<code>PARSE_OPT_KEEP_ARGV0</code>
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]929</dt>
930<dd>
931<p>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]932 Keep the first argument, which contains the program name. It&#8217;s
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]933 removed from argv[] by default.
934</p>
935</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]936<dt class="hdlist1">
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]937<code>PARSE_OPT_KEEP_UNKNOWN_OPT</code>
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]938</dt>
939<dd>
940<p>
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]941 Keep unknown options instead of erroring out. This doesn&#8217;t
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]942 work for all combinations of arguments as users might expect
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]943 it to do. E.g. if the first argument in <code>--unknown --known</code>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]944 takes a value (which we can&#8217;t know), the second one is
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]945 mistakenly interpreted as a known option. Similarly, if
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]946 <code>PARSE_OPT_STOP_AT_NON_OPTION</code> is set, the second argument in
947 <code>--unknown value</code> will be mistakenly interpreted as a
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]948 non-option, not as a value belonging to the unknown option,
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]949 the parser early. That&#8217;s why parse_options() errors out if
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]950 both options are set.
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]951 Note that non-option arguments are always kept, even without
952 this flag.
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]953</p>
954</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]955<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]956<code>PARSE_OPT_NO_INTERNAL_HELP</code>
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]957</dt>
958<dd>
959<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]960 By default, parse_options() handles <code>-h</code>, <code>--help</code> and
961 <code>--help-all</code> internally, by showing a help screen. This option
Junio C Hamano18f51402009-03-10 16:39:13[diff] [blame]962 turns it off and allows one to add custom handlers for these
963 options, or to just leave them unknown.
964</p>
965</dd>
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]966<dt class="hdlist1">
967<code>PARSE_OPT_SUBCOMMAND_OPTIONAL</code>
968</dt>
969<dd>
970<p>
971 Don&#8217;t error out when no subcommand is specified.
972</p>
973</dd>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]974</dl></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]975</li>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]976</ol></div>
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]977<div class="paragraph"><p>Note that <code>PARSE_OPT_STOP_AT_NON_OPTION</code> is incompatible with subcommands;
978while <code>PARSE_OPT_KEEP_DASHDASH</code> and <code>PARSE_OPT_KEEP_UNKNOWN_OPT</code> can only be
979used with subcommands when combined with <code>PARSE_OPT_SUBCOMMAND_OPTIONAL</code>.</p></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]980</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]981</div>
982<div class="sect1">
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]983<h2 id="_data_structure">Data Structure</h2>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]984<div class="sectionbody">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]985<div class="paragraph"><p>The main data structure is an array of the <code>option</code> struct,
986say <code>static struct option builtin_add_options[]</code>.
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]987There are some macros to easily define options:</p></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]988<div class="dlist"><dl>
989<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]990<code>OPT__ABBREV(&amp;int_var)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]991</dt>
992<dd>
993<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]994 Add <code>--abbrev[=&lt;n&gt;]</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]995</p>
996</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]997<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]998<code>OPT__COLOR(&amp;int_var, description)</code>
Junio C Hamano4aa0bcc2010-03-03 05:13:12[diff] [blame]999</dt>
1000<dd>
1001<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1002 Add <code>--color[=&lt;when&gt;]</code> and <code>--no-color</code>.
Junio C Hamano4aa0bcc2010-03-03 05:13:12[diff] [blame]1003</p>
1004</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1005<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1006<code>OPT__DRY_RUN(&amp;int_var, description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1007</dt>
1008<dd>
1009<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1010 Add <code>-n, --dry-run</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1011</p>
1012</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1013<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1014<code>OPT__FORCE(&amp;int_var, description)</code>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1015</dt>
1016<dd>
1017<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1018 Add <code>-f, --force</code>.
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1019</p>
1020</dd>
1021<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1022<code>OPT__QUIET(&amp;int_var, description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1023</dt>
1024<dd>
1025<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1026 Add <code>-q, --quiet</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1027</p>
1028</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1029<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1030<code>OPT__VERBOSE(&amp;int_var, description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1031</dt>
1032<dd>
1033<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1034 Add <code>-v, --verbose</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1035</p>
1036</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1037<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1038<code>OPT_GROUP(description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1039</dt>
1040<dd>
1041<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1042 Start an option group. <code>description</code> is a short string that
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1043 describes the group or an empty string.
1044 Start the description with an upper-case letter.
1045</p>
1046</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1047<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1048<code>OPT_BOOL(short, long, &amp;int_var, description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1049</dt>
1050<dd>
1051<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1052 Introduce a boolean option. <code>int_var</code> is set to one with
1053 <code>--option</code> and set to zero with <code>--no-option</code>.
Junio C Hamano4c6612f2011-10-12 23:54:21[diff] [blame]1054</p>
1055</dd>
1056<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1057<code>OPT_COUNTUP(short, long, &amp;int_var, description)</code>
Junio C Hamano4c6612f2011-10-12 23:54:21[diff] [blame]1058</dt>
1059<dd>
1060<p>
1061 Introduce a count-up option.
Junio C Hamanof2a3a752016-05-23 22:54:39[diff] [blame]1062 Each use of <code>--option</code> increments <code>int_var</code>, starting from zero
1063 (even if initially negative), and <code>--no-option</code> resets it to
1064 zero. To determine if <code>--option</code> or <code>--no-option</code> was encountered at
1065 all, initialize <code>int_var</code> to a negative value, and if it is still
1066 negative after parse_options(), then neither <code>--option</code> nor
1067 <code>--no-option</code> was seen.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1068</p>
1069</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1070<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1071<code>OPT_BIT(short, long, &amp;int_var, description, mask)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1072</dt>
1073<dd>
1074<p>
1075 Introduce a boolean option.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1076 If used, <code>int_var</code> is bitwise-ored with <code>mask</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1077</p>
1078</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1079<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1080<code>OPT_NEGBIT(short, long, &amp;int_var, description, mask)</code>
Junio C Hamano7ae18252009-05-23 09:53:32[diff] [blame]1081</dt>
1082<dd>
1083<p>
1084 Introduce a boolean option.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1085 If used, <code>int_var</code> is bitwise-anded with the inverted <code>mask</code>.
Junio C Hamano7ae18252009-05-23 09:53:32[diff] [blame]1086</p>
1087</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1088<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1089<code>OPT_SET_INT(short, long, &amp;int_var, description, integer)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1090</dt>
1091<dd>
1092<p>
Junio C Hamano4c6612f2011-10-12 23:54:21[diff] [blame]1093 Introduce an integer option.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1094 <code>int_var</code> is set to <code>integer</code> with <code>--option</code>, and
1095 reset to zero with <code>--no-option</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1096</p>
1097</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1098<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1099<code>OPT_STRING(short, long, &amp;str_var, arg_str, description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1100</dt>
1101<dd>
1102<p>
1103 Introduce an option with string argument.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1104 The string argument is put into <code>str_var</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1105</p>
1106</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1107<dt class="hdlist1">
Junio C Hamanocbe0eb22017-02-27 23:37:49[diff] [blame]1108<code>OPT_STRING_LIST(short, long, &amp;struct string_list, arg_str, description)</code>
1109</dt>
1110<dd>
1111<p>
1112 Introduce an option with string argument.
1113 The string argument is stored as an element in <code>string_list</code>.
1114 Use of <code>--no-option</code> will clear the list of preceding values.
1115</p>
1116</dd>
1117<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1118<code>OPT_INTEGER(short, long, &amp;int_var, description)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1119</dt>
1120<dd>
1121<p>
1122 Introduce an option with integer argument.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1123 The integer is put into <code>int_var</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1124</p>
1125</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1126<dt class="hdlist1">
Junio C Hamanod7ed4042015-08-03 19:43:00[diff] [blame]1127<code>OPT_MAGNITUDE(short, long, &amp;unsigned_long_var, description)</code>
1128</dt>
1129<dd>
1130<p>
1131 Introduce an option with a size argument. The argument must be a
1132 non-negative integer and may include a suffix of <em>k</em>, <em>m</em> or <em>g</em> to
1133 scale the provided value by 1024, 1024<sup>2 or 1024</sup>3 respectively.
1134 The scaled value is put into <code>unsigned_long_var</code>.
1135</p>
1136</dd>
1137<dt class="hdlist1">
Junio C Hamanod5176902017-05-16 04:30:56[diff] [blame]1138<code>OPT_EXPIRY_DATE(short, long, &amp;timestamp_t_var, description)</code>
Junio C Hamanoc7102962013-05-29 23:57:17[diff] [blame]1139</dt>
1140<dd>
1141<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1142 Introduce an option with expiry date argument, see <code>parse_expiry_date()</code>.
Junio C Hamanod5176902017-05-16 04:30:56[diff] [blame]1143 The timestamp is put into <code>timestamp_t_var</code>.
Junio C Hamanoc7102962013-05-29 23:57:17[diff] [blame]1144</p>
1145</dd>
1146<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1147<code>OPT_CALLBACK(short, long, &amp;var, arg_str, description, func_ptr)</code>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1148</dt>
1149<dd>
1150<p>
1151 Introduce an option with argument.
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1152 The argument will be fed into the function given by <code>func_ptr</code>
1153 and the result will be put into <code>var</code>.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1154 See <em>Option Callbacks</em> below for a more elaborate description.
1155</p>
1156</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1157<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1158<code>OPT_FILENAME(short, long, &amp;var, description)</code>
Junio C Hamano3d141512009-06-01 01:22:40[diff] [blame]1159</dt>
1160<dd>
1161<p>
1162 Introduce an option with a filename argument.
1163 The filename will be prefixed by passing the filename along with
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1164 the prefix argument of <code>parse_options()</code> to <code>prefix_filename()</code>.
Junio C Hamano3d141512009-06-01 01:22:40[diff] [blame]1165</p>
1166</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1167<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1168<code>OPT_NUMBER_CALLBACK(&amp;var, description, func_ptr)</code>
Junio C Hamano7ae18252009-05-23 09:53:32[diff] [blame]1169</dt>
1170<dd>
1171<p>
1172 Recognize numerical options like -123 and feed the integer as
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1173 if it was an argument to the function given by <code>func_ptr</code>.
1174 The result will be put into <code>var</code>. There can be only one such
Junio C Hamano7ae18252009-05-23 09:53:32[diff] [blame]1175 option definition. It cannot be negated and it takes no
1176 arguments. Short options that happen to be digits take
1177 precedence over it.
1178</p>
1179</dd>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1180<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1181<code>OPT_COLOR_FLAG(short, long, &amp;int_var, description)</code>
Junio C Hamano4aa0bcc2010-03-03 05:13:12[diff] [blame]1182</dt>
1183<dd>
1184<p>
1185 Introduce an option that takes an optional argument that can
1186 have one of three values: "always", "never", or "auto". If the
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1187 argument is not given, it defaults to "always". The <code>--no-</code> form
1188 works like <code>--long=never</code>; it cannot take an argument. If
1189 "always", set <code>int_var</code> to 1; if "never", set <code>int_var</code> to 0; if
1190 "auto", set <code>int_var</code> to 1 if stdout is a tty or a pager,
Junio C Hamano4aa0bcc2010-03-03 05:13:12[diff] [blame]1191 0 otherwise.
1192</p>
1193</dd>
Junio C Hamano4c6612f2011-10-12 23:54:21[diff] [blame]1194<dt class="hdlist1">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1195<code>OPT_NOOP_NOARG(short, long)</code>
Junio C Hamano4c6612f2011-10-12 23:54:21[diff] [blame]1196</dt>
1197<dd>
1198<p>
1199 Introduce an option that has no effect and takes no arguments.
1200 Use it to hide deprecated options that are still to be recognized
1201 and ignored silently.
1202</p>
1203</dd>
Junio C Hamanod7ed4042015-08-03 19:43:00[diff] [blame]1204<dt class="hdlist1">
1205<code>OPT_PASSTHRU(short, long, &amp;char_var, arg_str, description, flags)</code>
1206</dt>
1207<dd>
1208<p>
1209 Introduce an option that will be reconstructed into a char* string,
1210 which must be initialized to NULL. This is useful when you need to
1211 pass the command-line option to another command. Any previous value
1212 will be overwritten, so this should only be used for options where
1213 the last one specified on the command line wins.
1214</p>
1215</dd>
1216<dt class="hdlist1">
Junio C Hamanoc9dd6422020-08-10 23:32:55[diff] [blame]1217<code>OPT_PASSTHRU_ARGV(short, long, &amp;strvec_var, arg_str, description, flags)</code>
Junio C Hamanod7ed4042015-08-03 19:43:00[diff] [blame]1218</dt>
1219<dd>
1220<p>
1221 Introduce an option where all instances of it on the command-line will
Junio C Hamanoc9dd6422020-08-10 23:32:55[diff] [blame]1222 be reconstructed into a strvec. This is useful when you need to
Junio C Hamanod7ed4042015-08-03 19:43:00[diff] [blame]1223 pass the command-line option, which can be specified multiple times,
1224 to another command.
1225</p>
1226</dd>
Junio C Hamano84ea1e42016-04-08 21:53:48[diff] [blame]1227<dt class="hdlist1">
1228<code>OPT_CMDMODE(short, long, &amp;int_var, description, enum_val)</code>
1229</dt>
1230<dd>
1231<p>
1232 Define an "operation mode" option, only one of which in the same
1233 group of "operating mode" options that share the same <code>int_var</code>
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]1234 can be given by the user. <code>int_var</code> is set to <code>enum_val</code> when the
Junio C Hamano84ea1e42016-04-08 21:53:48[diff] [blame]1235 option is used, but an error is reported if other "operating mode"
1236 option has already set its value to the same <code>int_var</code>.
Junio C Hamanof7f8f212022-09-01 20:57:29[diff] [blame]1237 In new commands consider using subcommands instead.
1238</p>
1239</dd>
1240<dt class="hdlist1">
1241<code>OPT_SUBCOMMAND(long, &amp;fn_ptr, subcommand_fn)</code>
1242</dt>
1243<dd>
1244<p>
1245 Define a subcommand. <code>subcommand_fn</code> is put into <code>fn_ptr</code> when
1246 this subcommand is used.
Junio C Hamano84ea1e42016-04-08 21:53:48[diff] [blame]1247</p>
1248</dd>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1249</dl></div>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1250<div class="paragraph"><p>The last element of the array must be <code>OPT_END()</code>.</p></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1251<div class="paragraph"><p>If not stated otherwise, interpret the arguments as follows:</p></div>
1252<div class="ulist"><ul>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1253<li>
1254<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1255<code>short</code> is a character for the short option
1256 (e.g. <code>'e'</code> for <code>-e</code>, use <code>0</code> to omit),
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1257</p>
1258</li>
1259<li>
1260<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1261<code>long</code> is a string for the long option
1262 (e.g. <code>"example"</code> for <code>--example</code>, use <code>NULL</code> to omit),
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1263</p>
1264</li>
1265<li>
1266<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1267<code>int_var</code> is an integer variable,
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1268</p>
1269</li>
1270<li>
1271<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1272<code>str_var</code> is a string variable (<code>char *</code>),
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1273</p>
1274</li>
1275<li>
1276<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1277<code>arg_str</code> is the string that is shown as argument
1278 (e.g. <code>"branch"</code> will result in <code>&lt;branch&gt;</code>).
1279 If set to <code>NULL</code>, three dots (<code>...</code>) will be displayed.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1280</p>
1281</li>
1282<li>
1283<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1284<code>description</code> is a short string to describe the effect of the option.
1285 It shall begin with a lower-case letter and a full stop (<code>.</code>) shall be
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1286 omitted at the end.
1287</p>
1288</li>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1289</ul></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1290</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]1291</div>
1292<div class="sect1">
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1293<h2 id="_option_callbacks">Option Callbacks</h2>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1294<div class="sectionbody">
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1295<div class="paragraph"><p>The function must be defined in this form:</p></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1296<div class="literalblock">
1297<div class="content">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1298<pre><code>int func(const struct option *opt, const char *arg, int unset)</code></pre>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1299</div></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1300<div class="paragraph"><p>The callback mechanism is as follows:</p></div>
1301<div class="ulist"><ul>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1302<li>
1303<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1304Inside <code>func</code>, the only interesting member of the structure
1305 given by <code>opt</code> is the void pointer <code>opt-&gt;value</code>.
1306 <code>*opt-&gt;value</code> will be the value that is saved into <code>var</code>, if you
1307 use <code>OPT_CALLBACK()</code>.
1308 For example, do <code>*(unsigned long *)opt-&gt;value = 42;</code> to get 42
1309 into an <code>unsigned long</code> variable.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1310</p>
1311</li>
1312<li>
1313<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1314Return value <code>0</code> indicates success and non-zero return
1315 value will invoke <code>usage_with_options()</code> and, thus, die.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1316</p>
1317</li>
1318<li>
1319<p>
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1320If the user negates the option, <code>arg</code> is <code>NULL</code> and <code>unset</code> is 1.
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1321</p>
1322</li>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1323</ul></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1324</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]1325</div>
1326<div class="sect1">
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1327<h2 id="_sophisticated_option_parsing">Sophisticated option parsing</h2>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1328<div class="sectionbody">
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1329<div class="paragraph"><p>If you need, for example, option callbacks with optional arguments
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1330or without arguments at all, or if you need other special cases,
1331that are not handled by the macros above, you need to specify the
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1332members of the <code>option</code> structure manually.</p></div>
Junio C Hamano97bcb482010-11-25 03:16:07[diff] [blame]1333<div class="paragraph"><p>This is not covered in this document, but well documented
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1334in <code>parse-options.h</code> itself.</p></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1335</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]1336</div>
1337<div class="sect1">
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1338<h2 id="_examples">Examples</h2>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1339<div class="sectionbody">
Junio C Hamanoc14e6ad2014-10-31 20:25:53[diff] [blame]1340<div class="paragraph"><p>See <code>test-parse-options.c</code> and
1341<code>builtin/add.c</code>,
1342<code>builtin/clone.c</code>,
1343<code>builtin/commit.c</code>,
1344<code>builtin/fetch.c</code>,
1345<code>builtin/fsck.c</code>,
1346<code>builtin/rm.c</code>
Junio C Hamano4604fe52008-09-19 06:37:10[diff] [blame]1347for real-world examples.</p></div>
Junio C Hamano4224f992008-06-23 07:14:08[diff] [blame]1348</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]1349</div>
Junio C Hamano9d971152012-12-19 00:43:11[diff] [blame]1350</div>
Junio C Hamano7bd050f2011-09-22 06:32:22[diff] [blame]1351<div id="footnotes"><hr /></div>
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]1352<div id="footer">
1353<div id="footer-text">
Junio C Hamano2ef0ba32018-01-26 23:13:53[diff] [blame]1354Last updated
Junio C Hamanoa7b2c102023-06-13 21:00:15[diff] [blame]1355 2022-09-21 15:44:34 PDT
Junio C Hamano3dac5042007-12-15 08:40:54[diff] [blame]1356</div>
1357</div>
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