Allow setting arbitrary properties for versions; resolves #138

CHANGES.md

@@ -4,6 +4,7 @@
 
 ### New features
 
+- Add support for applying arbitrary properties to documentation versions
 - Deploy aliases using symbolic links by default; this can be configured via
   `--alias-type` on the command line or `alias_type` in the `mike` MkDocs plugin
 - Avoid creating empty commits by default; if you want empty commits, pass

README.md

@@ -132,7 +132,10 @@ redirect template with `-T`/`--template`; this takes a path to a [Jinja][jinja]
 template that accepts an `{{href}}` variable.
 
 If you'd like to specify a title for this version that doesn't match the version
-string, you can pass `-t TITLE`/`--title=TITLE` as well.
+string, you can pass `-t TITLE`/`--title=TITLE` as well. You can set custom
+properties for this version as well, using `--prop-set`, `--prop-set-string`,
+`--prop-set-all`, `--prop-delete`, and `--prop-delete-all` (see the [Managing
+Properties][#managing-properties] section for more details).
 
 In addition, you can specify where to deploy your docs via `-b`/`--branch`,
 `-r`/`--remote`, and `--deploy-prefix`, specifying the branch, remote, and
@@ -240,6 +243,41 @@ existing alias points to.
 Once again, you can specify `--branch`, `--push`, etc to control how the commit
 is handled.
 
+### Managing Properties
+
+Each version of your documentation can have any arbitrary properties assigned to
+it that you like. You can use these properties to hold extra metadata, and then
+your documentation theme can consult those properties to do whatever you like.
+You can get properties via `props` command:
+
+```sh
+mike props [identifier] [prop]
+```
+
+If `prop` is specified, this will return the value of that property; otherwise,
+it will return all of that version's properties as a JSON object.
+
+You can also set properties by specifying one or more of `--set prop=json`,
+`--set-string prop=str`, `--set-all json`, `--delete prop`, and `--delete-all`.
+(If you prefer, you can also set properties at the same time as deploying via
+the `--prop-*` options.)
+
+When getting or setting a particular property, you can specify it with a
+limited JSONPath-like syntax. You can use bare field names, quoted field
+names, and indices/field names inside square brackets. The only operator
+supported is `.`. For example, this is a valid expression:
+
+```javascript
+foo."bar"[0].["baz"]
+```
+
+When setting values, you can add to the head or tail of a list via the `head`
+or `tail` keywords, e.g.:
+
+```javascript
+foo[head]
+```
+
 ### More Details
 
 For more details on the available options, consult the `--help` command for
@@ -314,10 +352,15 @@ this:
 ```js
 [
   {"version": "1.0", "title": "1.0.1", "aliases": ["latest"]},
-  {"version": "0.9", "title": "0.9", "aliases": []}
+  {"version": "0.9", "title": "0.9", "aliases": [], properties: "anything"}
 ]
 ```
 
+Every version has a `version` string, a `title` (which may be the same as
+`version`), a list of `aliases`, and optionally, a `properties` attribute that
+can hold anything at all. These properties can be used by other packages,
+themes, etc in order to add their own custom metadata to each version.
+
 If you're creating a third-party extension to an existing theme, you add a
 setuptools entry point for `mike.themes` pointing to a Python submodule that
 contains `css/` and `js/` subdirectories containing the extra code to be

mike/arguments.py

@@ -1,4 +1,6 @@
 from argparse import *
+import re as _re
+import textwrap as _textwrap
 
 _ArgumentParser = ArgumentParser
 _Action = Action
@@ -13,6 +15,13 @@ def _add_complete(argument, complete):
     return argument
 
 
+class ParagraphDescriptionHelpFormatter(HelpFormatter):
+    def _fill_text(self, text, width, indent):
+        # Re-fill text, but keep paragraphs. Why isn't this the default???
+        return '\n\n'.join(_textwrap.fill(i, width) for i in
+                           _re.split('\n\n', text.strip()))
+
+
 class Action(_Action):
     def __init__(self, *args, complete=None, **kwargs):
         super().__init__(*args, **kwargs)

mike/commands.py

@@ -62,7 +62,7 @@ def make_nojekyll():
 @contextmanager
 def deploy(cfg, version, title=None, aliases=[], update_aliases=False,
            alias_type=AliasType.symlink, template=None, *, branch='gh-pages',
-           message=None, allow_empty=False, deploy_prefix=''):
+           message=None, allow_empty=False, deploy_prefix='', set_props=[]):
     if message is None:
         message = (
             'Deployed {rev} to {doc_version}{deploy_prefix} with MkDocs ' +
@@ -81,6 +81,9 @@ def deploy(cfg, version, title=None, aliases=[], update_aliases=False,
     destdir = os.path.join(deploy_prefix, version_str)
     alias_destdirs = [os.path.join(deploy_prefix, i) for i in info.aliases]
 
+    for path, value in set_props:
+        info.set_property(path, value)
+
     # Let the caller perform the build.
     yield
 
@@ -209,6 +212,43 @@ def alias(cfg, identifier, aliases, update_aliases=False,
         commit.add_file(versions_to_file_info(all_versions, deploy_prefix))
 
 
+def get_property(identifier, prop, *, branch='gh-pages', deploy_prefix=''):
+    all_versions = list_versions(branch, deploy_prefix)
+    try:
+        real_version = all_versions.find(identifier, strict=True)[0]
+        info = all_versions[real_version]
+    except KeyError as e:
+        raise ValueError('identifier {} does not exist'.format(e))
+
+    return info.get_property(prop)
+
+
+def set_properties(identifier, set_props, *, branch='gh-pages', message=None,
+                   allow_empty=False, deploy_prefix=''):
+    all_versions = list_versions(branch, deploy_prefix)
+    try:
+        real_version = all_versions.find(identifier, strict=True)[0]
+        info = all_versions[real_version]
+    except KeyError as e:
+        raise ValueError('identifier {} does not exist'.format(e))
+
+    if message is None:
+        message = (
+            'Set properties for {doc_version}{deploy_prefix} with mike ' +
+            '{mike_version}'
+        ).format(
+            doc_version=real_version,
+            deploy_prefix=_format_deploy_prefix(deploy_prefix),
+            mike_version=app_version
+        )
+
+    for path, value in set_props:
+        info.set_property(path, value)
+
+    with git_utils.Commit(branch, message, allow_empty=allow_empty) as commit:
+        commit.add_file(versions_to_file_info(all_versions, deploy_prefix))
+
+
 def retitle(identifier, title, *, branch='gh-pages', message=None,
             allow_empty=False, deploy_prefix=''):
     if message is None:

mike/driver.py

@@ -1,9 +1,12 @@
+import json
 import os
 import sys
 from contextlib import contextmanager
 
-from . import arguments, commands
+from . import arguments
+from . import commands
 from . import git_utils
+from . import jsonpath
 from . import mkdocs_utils
 from .app_version import version as app_version
 from .mkdocs_plugin import MikePlugin
@@ -32,6 +35,22 @@
 the target branch.
 """
 
+props_desc = """
+Get or set properties for the specified version.
+
+When getting or setting a particular property, you can specify it with a
+limited JSONPath-like syntax. You can use bare field names, quoted field names,
+and indices/field names inside square brackets. The only operator supported is
+`.`. For example, this is a valid expression:
+
+  foo."bar"[0].["baz"]
+
+When setting values, you can add to the head or tail of a list via the `head`
+or `tail` keywords, e.g.:
+
+  foo[head]
+"""
+
 retitle_desc = """
 Change the descriptive title of the specified version of the documentation on
 the target branch.
@@ -80,13 +99,40 @@ def add_git_arguments(parser, *, commit=True, deploy_prefix=True):
     if deploy_prefix:
         git.add_argument('--deploy-prefix', metavar='PATH',
                          complete='directory',
-                         help=('subdirectory within {branch} where generated '
-                               'docs should be deployed to'))
+                         help=('subdirectory within {branch} where ' +
+                               'generated docs should be deployed to'))
 
     git.add_argument('--ignore-remote-status', action='store_true',
                      help="don't check status of remote branch")
 
 
+def add_set_prop_arguments(parser, *, prefix=''):
+    def parse_set_json(expression):
+        result = jsonpath.parse_set(expression)
+        return result[0], json.loads(result[1])
+
+    prop_p = parser.add_argument_group('property manipulation arguments')
+    prop_p.add_argument('--{}set'.format(prefix), metavar='PROP=JSON',
+                        action='append', type=parse_set_json, dest='set_props',
+                        help='set the property at PROP to a JSON value')
+    prop_p.add_argument('--{}set-string'.format(prefix), metavar='PROP=STRING',
+                        action='append', type=jsonpath.parse_set,
+                        dest='set_props',
+                        help='set the property at PROP to a STRING value')
+    prop_p.add_argument('--{}set-all'.format(prefix), metavar='JSON',
+                        action='append', type=lambda x: ('', json.loads(x)),
+                        dest='set_props',
+                        help='set all properties to a JSON value')
+    prop_p.add_argument('--{}delete'.format(prefix), metavar='PROP',
+                        action='append',
+                        type=lambda x: (jsonpath.parse(x), jsonpath.Deleted),
+                        dest='set_props', help='delete the property at PROP')
+    prop_p.add_argument('--{}delete-all'.format(prefix),
+                        action='append_const', const=('', jsonpath.Deleted),
+                        dest='set_props', help='delete all properties')
+    return prop_p
+
+
 def load_mkdocs_config(args, strict=False):
     def maybe_set(args, cfg, field, cfg_field=None):
         if getattr(args, field, object()) is None:
@@ -149,7 +195,8 @@ def deploy(parser, args):
                              args.update_aliases, alias_type, args.template,
                              branch=args.branch, message=args.message,
                              allow_empty=args.allow_empty,
-                             deploy_prefix=args.deploy_prefix), \
+                             deploy_prefix=args.deploy_prefix,
+                             set_props=args.set_props or []), \
              mkdocs_utils.inject_plugin(args.config_file) as config_file:
             mkdocs_utils.build(config_file, args.version)
         if args.push:
@@ -179,6 +226,28 @@ def alias(parser, args):
             git_utils.push_branch(args.remote, args.branch)
 
 
+def props(parser, args):
+    load_mkdocs_config(args)
+    check_remote_status(args, strict=args.set_props)
+
+    if args.get_prop and args.set_props:
+        raise ValueError('cannot get and set properties at the same time')
+    elif args.set_props:
+        with handle_empty_commit():
+            commands.set_properties(args.identifier, args.set_props,
+                                    branch=args.branch, message=args.message,
+                                    allow_empty=args.allow_empty,
+                                    deploy_prefix=args.deploy_prefix)
+            if args.push:
+                git_utils.push_branch(args.remote, args.branch)
+    else:
+        print(json.dumps(
+            commands.get_property(args.identifier, args.get_prop,
+                                  branch=args.branch,
+                                  deploy_prefix=args.deploy_prefix)
+        ))
+
+
 def retitle(parser, args):
     load_mkdocs_config(args)
     check_remote_status(args, strict=True)
@@ -282,6 +351,7 @@ def main():
     deploy_p.add_argument('-T', '--template', complete='file',
                           help='template file to use for redirects')
     add_git_arguments(deploy_p)
+    add_set_prop_arguments(deploy_p, prefix='prop-')
     deploy_p.add_argument('version', metavar='VERSION',
                           help='version to deploy this build to')
     deploy_p.add_argument('aliases', nargs='*', metavar='ALIAS',
@@ -315,6 +385,18 @@ def main():
     alias_p.add_argument('aliases', nargs='*', metavar='ALIAS',
                          help='new alias to add')
 
+    props_p = subparsers.add_parser(
+        'props', description=props_desc, help='get/set version properties',
+        formatter_class=arguments.ParagraphDescriptionHelpFormatter
+    )
+    props_p.set_defaults(func=props)
+    add_git_arguments(props_p)
+    add_set_prop_arguments(props_p)
+    props_p.add_argument('identifier', metavar='IDENTIFIER',
+                         help='existing version or alias')
+    props_p.add_argument('get_prop', nargs='?', metavar='PROP', default='',
+                         help='property to get')
+
     retitle_p = subparsers.add_parser(
         'retitle', description=retitle_desc,
         help='change the title of a version'

test/integration/test_command_line.py

@@ -20,6 +20,12 @@ def test_help_subcommand_extra(self):
                               '--ignore-remote-status'])
         self.assertRegex(output, r'^usage: mike deploy')
 
+    def test_help_paragraph_formatter(self):
+        output = assertPopen(['mike', 'help', 'props'])
+        self.assertRegex(output, r'^usage: mike props')
+        self.assertRegex(output, ('(?m)^Get or set properties for the ' +
+                                  'specified version\.\n\nWhen getting'))
+
 
 class GenerateCompletionTest(unittest.TestCase):
     def test_completion(self):

test/integration/test_deploy.py

@@ -105,6 +105,16 @@ def test_aliases_copy(self):
             versions.VersionInfo('1.0', aliases=['latest'])
         ], alias_type=AliasType.copy)
 
+    def test_props(self):
+        assertPopen(['mike', 'deploy', '1.0',
+                     '--prop-set', 'foo.bar=[1,2,3]',
+                     '--prop-set', 'foo.bar[1]=true',
+                     '--prop-delete', 'foo.bar[0]'])
+        check_call_silent(['git', 'checkout', 'gh-pages'])
+        self._test_deploy(expected_versions=[
+            versions.VersionInfo('1.0', properties={'foo': {'bar': [True, 3]}})
+        ])
+
     def test_update(self):
         assertPopen(['mike', 'deploy', '1.0', 'latest'])
         assertPopen(['mike', 'deploy', '1.0', 'greatest', '-t', '1.0.1'])