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| Each template is simply a file or string with a number of tags of the form `{variable}` that get replaced with the appropriate text when the template gets processed. For example, here's the template for the tags page in the former default theme: | Each template is simply a file or string with a number of tags of the form `{variable}` that get replaced with the appropriate text when the template gets processed. For example, here's a simplified version of the template for the tags page in the `spartan` theme: |
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| <title>{repo}: tags</title> | <title>{repo|escape}: tags</title> |
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| <a href="?cmd=changelog;rev={rev}">changelog</a> <a href="?cmd=manifest;manifest={manifest};path=/">manifest</a> |
<a href="{url}log{sessionvars%urlparameter}">changelog</a> <a href="{url}shortlog{sessionvars%urlparameter}">shortlog</a> <a href="{url}graph{sessionvars%urlparameter}">graph</a> <a href="{url}branches{sessionvars%urlparameter}">branches</a> <a href="{url}file/{node|short}/{sessionvars%urlparameter}">files</a> |
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There are four main kinds of template operations in the above example: * The ''inclusion'' of a fragment `{header}` which brings in text from another location * The ''substitution'' of a variable `{url}` which replaces the variable name with a proper value * The substitution of a variable which is then processed or ''filtered'', so that `{repo|escape}` replaces the variable name `repo` with a value that has been processed by the `escape` function * The ''interpolation'' `{entries%tagentry}` of values in a collection `entries` using a fragment `tagentry` which brings in text that will be processed according to each set of values Here, we define a ''fragment'' as a template defined in the map file that contributes to another template by providing a region of the final document, page or response. |
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| || diffblock || lines in a diff || (lines, parity) || || filedifflink || link to diff || (node, file) || |
|| diffblock || lines in a diff || (`lines`, `parity`) || || filedifflink || link to diff || (`node`, `file`) || |
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| || filenodelink || link to file || (node, file, parity) || | || filenodelink || link to file || (`node`, `file`, `parity`) || |
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| || tagentry || tag details (summary) || (node, tag, date, parity) || == Substitutions == Although the above definition of a template would imply that arbitrary substitutions can be defined, in practice only a selection of variables are defined. In the above example, `{repo}` causes the predefined variable of that name to yield its value such that it is substituted into the output. Similarly, `{header}` and `{footer}` respectively cause the contents of the header and footer definitions to be substituted into the output. It is not currently possible to define arbitrary substitutions in the map file and then reference them in the unconditional form described above. For example, defining the following in the map file... |
|| tagentry || tag details (summary) || (`node`, `tag`, `date`, `parity`) || ==== Data Types ==== The following data types or structures are available to various templates and fragments: || '''Data Type''' || '''Members''' || || annotate (fileannotate) || `parity`, `rev`, `node`, `author`, `desc`, `file`, `targetline`, `line`, `lineid`, `linenumber` || || changeset || `rev`, `node`, `author`, `desc`, `date`, `tags`, `branches`, `inbranch`, `parent`, `child`, `files`, `diff`, `branch`, `changesettag`, `changesetbranch`, `archives` || || entries (search, changelog) || `parity`, `rev`, `node`, `author`, `desc`, `date`, `tags`, `branches`, `inbranch`, `parent`, `child`, `files`, `changelogtag` || || entries (filelog) || `parity`, `filerev`, `node`, `author`, `desc`, `date`, `tags`, `branches`, `inbranch`, `parent`, `child`, `branch`, `rename`, `file` || || fileannotate || `rev`, `node`, `author`, `desc`, `date`, `parent`, `child`, `branch`, `rename`, `file`, `annotate`, `permissions` || || filediff || `rev`, `node`, `author`, `desc`, `date`, `parent`, `child`, `branch`, `rename`, `file`, `diff` || || manifest || `rev`, `node`, `tags`, `branches`, `inbranch`, `archives`, `path`, `up`, `upparity`, `dentries`, `fentries` || || shortlogentry || `parity`, `rev`, `node`, `author`, `desc`, `date`, `tags`, `branches`, `inbranch` || Source: `mercurial.hgweb.webcommands` == Inclusion and Substitutions == Although the above definition of a template (`{variable}` gets replaced with some text) would imply that arbitrary substitutions can be defined, in practice some limitations apply: * Only fragments listed above as providing ''special substitution without data'' can be incorporated into a template or fragment using a simple inclusion or substitution * For example: `{header}` * See the note below about the limitations of inclusion * Thus, all other fragments must be used in ''interpolation'' operations, as described below * Only a selection of variables is defined for each template or fragment * For example: `{url}` * See the fragments and data types tables above for some guidance See the filters section below for a description of how filters can be applied to substitutions. === Limitations of Inclusion === It is not currently possible to define arbitrary substitutions in the map file and then reference them as if they were simple variables (like `{url}` or `{repo|escape}`). For example, defining the following in the map file... |
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| Consider the {{{{entries%tagentry}}}} line in the above example. The `entries` variable is actually a list of variable mappings, and the `%` syntax instructs the template engine to apply the `tagentry` format to each of them. | Consider the `{entries%tagentry}` line in the example given above. The `entries` variable is actually a list of variable mappings, and the `%` syntax instructs the template engine to apply the `tagentry` format to each of them. The members in each variable mapping are given above in the fragments and data types tables. |
Theming
The hgweb interface is completely themable. All output is generated from templates, nothing is hardcoded. Here's how it works:
Note that internally in the code, the term "style" may be used, but for the sake of avoiding confusion with other meanings of this word, the term "theme" is used in this document to describe the resources that change the hgweb interface's appearance.
Contents
The Map File
The hgweb engine looks up themes in the templates directory, typically residing within the mercurial package when installed, although some operating system distributions may link mercurial/templates to another location (such as /usr/share/mercurial/templates). A theme may have its own directory with a file named map, or it may place a file in the templates directory with a name of the form map-<theme>, and this map file will look something like this:
default = 'shortlog'
mimetype = 'text/html; charset={encoding}'
header = header.tmpl
footer = footer.tmpl
search = search.tmpl
changelog = changelog.tmpl
shortlog = shortlog.tmpl
shortlogentry = shortlogentry.tmpl
naventry = '<a href="{url}log/{node|short}{sessionvars%urlparameter}">{label|escape}</a> '
...This maps a template name to either a file (for example, the content for header is found in the header.tmpl file) or a simple quoted string (such as naventry). The latter is used for small templates where a separate file would be awkward.
A theme is simply a separate map file and possibly some additional template files. Mercurial comes with a few themes already, including the default HTML style (called paper), an XML style for Atom and RSS feeds, and a raw theme that allows getting patches and source files as plain text, as well as a gitweb-lookalike theme. In version 1.5 there are also coal, monoblue and spartan themes.
Templates
Each template is simply a file or string with a number of tags of the form {variable} that get replaced with the appropriate text when the template gets processed. For example, here's a simplified version of the template for the tags page in the spartan theme:
{header}
<title>{repo|escape}: tags</title>
</head>
<body>
<div class="buttons">
<a href="{url}log{sessionvars%urlparameter}">changelog</a>
<a href="{url}shortlog{sessionvars%urlparameter}">shortlog</a>
<a href="{url}graph{sessionvars%urlparameter}">graph</a>
<a href="{url}branches{sessionvars%urlparameter}">branches</a>
<a href="{url}file/{node|short}/{sessionvars%urlparameter}">files</a>
</div>
<h2>tags:</h2>
<ul id="tagEntries">
{entries%tagentry}
</ul>
{footer}There are four main kinds of template operations in the above example:
The inclusion of a fragment {header} which brings in text from another location
The substitution of a variable {url} which replaces the variable name with a proper value
The substitution of a variable which is then processed or filtered, so that {repo|escape} replaces the variable name repo with a value that has been processed by the escape function
The interpolation {entries%tagentry} of values in a collection entries using a fragment tagentry which brings in text that will be processed according to each set of values
Here, we define a fragment as a template defined in the map file that contributes to another template by providing a region of the final document, page or response.
Essential Templates
To have a functioning theme, the following templates appear to be necessary:
Page-Level Templates
These templates provide entire pages:
Template |
Information |
View Type |
branches |
named branches |
per-repository (introduced in recent versions) |
changelog |
history |
per-repository |
changeset |
log entry view |
|
error |
error page |
|
fileannotate |
file editors/contributors |
per-file |
filediff |
file changes |
per-file |
filerevision |
file view |
per-file |
graph |
graphical history |
per-repository (introduced in recent versions) |
index |
list of repositories |
|
manifest |
files/browse |
per-repository |
notfound |
resource not found page |
|
search |
search results page |
|
shortlog |
history |
per-repository |
summary |
summary/dashboard page |
per-repository |
tags |
tag definitions |
per-repository |
Fragments
These templates are used by the page-level templates to complete displayed pages:
Fragment |
Purpose |
Data Type |
header |
page header |
special substitution without data |
footer |
page footer |
special substitution without data |
mimetype |
content/media type |
special substitution without data |
diffblock |
lines in a diff |
(lines, parity) |
filedifflink |
link to diff |
(node, file) |
fileellipses |
... or similar |
special substitution without data |
filenodelink |
link to file |
(node, file, parity) |
searchentry |
search result |
shortlogentry |
tagentry |
tag details (summary) |
(node, tag, date, parity) |
Data Types
The following data types or structures are available to various templates and fragments:
Data Type |
Members |
annotate (fileannotate) |
parity, rev, node, author, desc, file, targetline, line, lineid, linenumber |
changeset |
rev, node, author, desc, date, tags, branches, inbranch, parent, child, files, diff, branch, changesettag, changesetbranch, archives |
entries (search, changelog) |
parity, rev, node, author, desc, date, tags, branches, inbranch, parent, child, files, changelogtag |
entries (filelog) |
parity, filerev, node, author, desc, date, tags, branches, inbranch, parent, child, branch, rename, file |
fileannotate |
rev, node, author, desc, date, parent, child, branch, rename, file, annotate, permissions |
filediff |
rev, node, author, desc, date, parent, child, branch, rename, file, diff |
manifest |
rev, node, tags, branches, inbranch, archives, path, up, upparity, dentries, fentries |
shortlogentry |
parity, rev, node, author, desc, date, tags, branches, inbranch |
Source: mercurial.hgweb.webcommands
Inclusion and Substitutions
Although the above definition of a template ({variable} gets replaced with some text) would imply that arbitrary substitutions can be defined, in practice some limitations apply:
Only fragments listed above as providing special substitution without data can be incorporated into a template or fragment using a simple inclusion or substitution
For example: {header}
- See the note below about the limitations of inclusion
Thus, all other fragments must be used in interpolation operations, as described below
- Only a selection of variables is defined for each template or fragment
For example: {url}
- See the fragments and data types tables above for some guidance
See the filters section below for a description of how filters can be applied to substitutions.
Limitations of Inclusion
It is not currently possible to define arbitrary substitutions in the map file and then reference them as if they were simple variables (like {url} or {repo|escape}). For example, defining the following in the map file...
logo = '<img src="/images/mercurial.png" alt="Mercurial logo" />'
...and then inserting the reference {logo} in a template will not cause the substitution to occur.
Interpolations
Consider the {entries%tagentry} line in the example given above. The entries variable is actually a list of variable mappings, and the % syntax instructs the template engine to apply the tagentry format to each of them. The members in each variable mapping are given above in the fragments and data types tables.
Note that the tagentry definition is successfully referenced here, and its contents applied to each entry in the entries collection, precisely because an interpolation is being performed. Thus, the limitation described above (where an unconditional {tagentry} reference would fail) does not apply here.
Filters
There is also a set of filters that can be applied to replacements, for example:
<title>{repo|escape}: changeset {node|short}</title>This applies the escape filter to the repo variable and the short filter to the node variable. Multiple filters can be applied to a single variable:
<h2>changeset: {repo|escape|firstline}</h2>The available filters include:
escape: escape HTML
age: print a date in 'x days ago' format (e.g. {date|age} gives 15 hours ago)
date: print a date in default format (e.g. {date|date} gives Mon Mar 29 15:16:05 2010 -0500)
rfc822date: print a date in rfc822 format (e.g. {date|rfc822date} gives Mon, 29 Mar 2010 15:16:05 -0500)
rfc3339date: print a date in rfc3339 format (e.g. {date|rfc3339date} gives 2010-03-29T15:16:05-05:00)
localdate: print a date in the local timezone (e.g. {date|localdate|rfc822date} gives Mon, 29 Mar 2010 21:16:05 +0100)
shortdate: print a date in short format (e.g. {date|shortdate} gives 2010-03-29)
addbreaks: insert <br> tags for newlines
obfuscate: disguise email addresses
short: print node ids in short form
firstline: print the first line of a multiline string
permissions: convert a permission code to ls-style formatting
Creating Your Own Theme
Now that you know how the templates work, creating your own theme is simply a matter of copying the stock map file to map-mytheme, modifying it, and copying any template files you modify.
Selecting a Theme
Themes (known also as styles) can be switched by appending the style=mytheme URL parameter, preceding it with ? or & as appropriate. This should allow you to navigate around the Web interface using the specified theme, although some operations may reset the theme.
To switch the default theme for your repository viewer, add the following to your .hg/hgrc file:
[web] style = mytheme