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namespaces: let namespaces override singlenode() definition
Some namespaces have multiple nodes per name (meaning that their
namemap() returns multiple nodes). One such namespace is the "topics"
namespace (from the evolve repo). We also have our own internal
namespace at Google (for review units) that has multiple nodes per
name. These namespaces may not want to use the default "pick highest
revnum" resolution that we currently use when resolving a name to a
single node. As an example, they may decide that `hg co <name>` should
check out a commit that's last in some sense even if an earlier commit
had just been amended and thus had a higher revnum [1]. This patch
gives the namespace the option to continue to return multiple nodes
and to override how the best node is picked. Allowing namespaces to
override that may also be useful as an optimization (it may be cheaper
for the namespace to find just that node).
I have been arguing (in D3715) for using all the nodes returned from
namemap() when resolving the symbol to a revset, so e.g. `hg log -r
stable` would resolve to *all* nodes on stable, not just the one with
the highest revnum (except that I don't actually think we should
change it for the branch namespace because of BC). Most people seem
opposed to that. If we decide not to do it, I think we can deprecate
the namemap() function in favor of the new singlenode() (I find it
weird to have namespaces, like the branch namespace, where namemap()
isn't nodemap()'s inverse). I therefore think this patch makes sense
regardless of what we decide on that issue.
[1] Actually, even the branch namespace would have wanted to override
singlenode() if it had supported multiple nodes. That's because
closes branch heads are mostly ignored, so "hg co default" will
not check out the highest-revnum node if that's a closed head.
Differential Revision: https://phab.mercurial-scm.org/D3852
author | Martin von Zweigbergk <martinvonz@google.com> |
---|---|
date | Tue, 26 Jun 2018 10:02:01 -0700 |
parents | 4b0fc75f9403 |
children |
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/* * Styles for man pages, which match with https://mercurial-scm.org/ * * Color scheme & layout are borrowed from * https://mercurial-scm.org/css/styles.css * * Some styles are from html4css1.css from Docutils, which is in the * public domain. */ body { margin: 0; padding: 0; font-family: sans-serif; } .document { position: relative; /* be a top of absolute positioning */ margin: 1.5em 1.8em; padding: 0; line-height: 1.3; } /* layout: toc to right */ #contents { position: absolute; right: 0; top: 0; width: 26%; } /* layout: others to left */ h1.title, h2.subtitle, .section { width: 72%; } .section .section { width: auto; } table.docinfo { max-width: 72%; } /* headings */ h1, h2, .topic-title, .admonition-title { font-family: "MgOpen Cosmetica", "Lucida Sans Unicode", sans-serif; font-weight: normal; } h1, h2, .topic-title, .admonition-title { margin: 1em 0 0.5em; } h1.title { font-size: 300%; } h2.subtitle, h1 { font-size: 200%; } h2, .topic-title, .admonition-title { font-size: 140%; } /* subtitle starts with lowercase in man pages, but not in HTML */ h2.subtitle:first-letter { text-transform: uppercase; } /* override first/last margin */ .first, h1.title, h2.subtitle { margin-top: 0 !important; } .last, .with-subtitle { margin-bottom: 0 !important; } blockquote, pre, dd .option-list, .field-list { margin: 0.2em 0 1em 2em; } kbd, tt, pre { font-family: monospace; } dt { font-weight: bold; } dd { margin-bottom: 0.5em; } th, td { padding: 0.1em 0.2em; border: 0 none; } th { font-weight: bold; text-align: left; } a:link, a:visited { text-decoration: underline; } a:hover, a:focus { text-decoration: none; } a:link { color: #00b5f1; } a:visited { color: #5c9caf; } a:link.toc-backref, a:visited.toc-backref { text-decoration: none; color: inherit; /* NOTE: `inherit' is not supported by IE6 */ } div.admonition, div.attention, div.caution, div.danger, div.error, div.hint, div.important, div.note, div.tip, div.warning { border-top: 1px #ccc solid; border-bottom: 1px #ccc solid; padding: 0.3em 1em; margin: 1em; } div.note { border-color: #fcc200; } /* * The following styles are from Docutils. * Please refine if necessary. */ table.borderless td, table.borderless th { /* Override padding for "table.docutils td" with "! important". The right padding separates the table cells. */ padding: 0 0.5em 0 0 ! important; } .hidden { display: none; } blockquote.epigraph { margin: 2em 5em; } div.abstract { margin: 2em 5em; } div.dedication { margin: 2em 5em; text-align: center; font-style: italic; } div.figure { margin-left: 2em; margin-right: 2em; } div.footer, div.header { clear: both; font-size: smaller; } div.line-block { display: block; margin-top: 1em; margin-bottom: 1em; } div.line-block div.line-block { margin-top: 0; margin-bottom: 0; margin-left: 1.5em; } div.sidebar { margin: 0 0 0.5em 1em; border: medium outset; padding: 1em; background-color: #ffffee; width: 40%; float: right; clear: right; } div.sidebar p.rubric { font-family: sans-serif; font-size: medium; } div.system-messages { margin: 5em; } div.system-messages h1 { color: red; } div.system-message { border: medium outset; padding: 1em; } div.system-message p.system-message-title { color: red; font-weight: bold; } h1.section-subtitle, h2.section-subtitle, h3.section-subtitle, h4.section-subtitle, h5.section-subtitle, h6.section-subtitle { margin-top: 0.4em; } hr.docutils { width: 75%; } img.align-left { clear: left; } img.align-right { clear: right; } ol.simple, ul.simple { margin-bottom: 1em; } ol.arabic { list-style: decimal; } ol.loweralpha { list-style: lower-alpha; } ol.upperalpha { list-style: upper-alpha; } ol.lowerroman { list-style: lower-roman; } ol.upperroman { list-style: upper-roman; } p.attribution { text-align: right; margin-left: 50%; } p.caption { font-style: italic; } p.credits { font-style: italic; font-size: smaller; } p.label { white-space: nowrap; } p.rubric { font-weight: bold; font-size: larger; color: maroon; text-align: center; } pre.address { margin-bottom: 0; margin-top: 0; font-family: serif; font-size: 100%; } pre.literal-block, pre.doctest-block { margin-left: 2em; margin-right: 2em; } span.classifier { font-family: sans-serif; font-style: oblique; } span.classifier-delimiter { font-family: sans-serif; font-weight: bold; } span.interpreted { font-family: sans-serif; } span.option { white-space: nowrap; } span.pre { white-space: pre; } span.problematic { color: red; } span.section-subtitle { /* font-size relative to parent (h1..h6 element) */ font-size: 80%; } table.citation { border-left: solid 1px gray; margin-left: 1px; } table.footnote { border-left: solid 1px black; margin-left: 1px; } h1 tt.docutils, h2 tt.docutils, h3 tt.docutils, h4 tt.docutils, h5 tt.docutils, h6 tt.docutils { font-size: 100%; } ul.auto-toc { list-style-type: none; } div.contents.local { -moz-column-width: 10em; -moz-column-gap: 1em; -webkit-column-width: 10em; -webkit-column-gap: 1em; }