make directory redirects absolute paths

I think this is always the right choice, since we're rewriting the full
input path

incorporealcms/__init__.py

@@ -3,7 +3,7 @@ import logging
 import os
 from logging.config import dictConfig
 
-from flask import Flask, request, send_from_directory
+from flask import Flask, request
 
 from ._version import get_versions
 
@@ -40,11 +40,6 @@ def create_app(instance_path=None, test_config=None):
         logger.info("RESPONSE: %s %s: %s", request.method, request.path, response.status)
         return response
 
-    @app.route(f'/{app.config["MEDIA_DIR"]}/<path:filename>')
-    def media_files(filename):
-        return send_from_directory(os.path.join(app.instance_path, app.config['MEDIA_DIR']),
-                                   filename)
-
     from . import error_pages, pages
     app.register_blueprint(pages.bp)
     app.register_error_handler(400, error_pages.bad_request)

incorporealcms/config.py

@@ -48,7 +48,11 @@ class Config(object):
         },
     }
 
-    DEFAULT_PAGE_STYLE = 'light'
-
-    TITLE_SUFFIX = 'incorporeal.org'
     MEDIA_DIR = 'media'
+
+    # customizations
+    DEFAULT_PAGE_STYLE = 'light'
+    TITLE_SUFFIX = 'incorporeal.org'
+    CONTACT_EMAIL = 'bss@incorporeal.org'
+
+    # specify FAVICON in your instance config.py to override the suou icon

incorporealcms/lib.py

@@ -34,6 +34,7 @@ def render(template_name_or_list, **context):
     PAGE_STYLES = {
         'dark': 'css/dark.css',
         'light': 'css/light.css',
+        'plain': 'css/plain.css',
     }
 
     selected_style = request.args.get('style', None)

incorporealcms/pages.py

@@ -6,7 +6,7 @@ import re
 
 from flask import Blueprint, Markup, abort
 from flask import current_app as app
-from flask import redirect, request
+from flask import redirect, request, send_from_directory
 from tzlocal import get_localzone
 
 from incorporealcms.lib import get_meta_str, init_md, render
@@ -21,15 +21,24 @@ bp = Blueprint('pages', __name__, url_prefix='/')
 def display_page(path):
     """Get the file contents of the requested path and render the file."""
     try:
-        resolved_path = request_path_to_instance_resource_path(path)
+        resolved_path, render_type = request_path_to_instance_resource_path(path)
-        logger.debug("received request for path '%s', resolved to '%s'", path, resolved_path)
+        logger.debug("received request for path '%s', resolved to '%s', type '%s'",
+                     path, resolved_path, render_type)
     except PermissionError:
         abort(400)
     except IsADirectoryError:
-        return redirect(f'{path}/', code=301)
+        return redirect(f'/{path}/', code=301)
     except FileNotFoundError:
         abort(404)
 
+    if render_type == 'file':
+        return send_from_directory(app.instance_path, resolved_path)
+    elif render_type == 'symlink':
+        logger.debug("attempting to redirect path '%s' to reverse of resource '%s'", path, resolved_path)
+        redirect_path = f'/{instance_resource_path_to_request_path(resolved_path)}'
+        logger.debug("redirect path: '%s'", redirect_path)
+        return redirect(redirect_path, code=301)
+    elif render_type == 'markdown':
         try:
             with app.open_instance_resource(resolved_path, 'r') as entry_file:
                 mtime = datetime.datetime.fromtimestamp(os.path.getmtime(entry_file.name), get_localzone())
@@ -50,8 +59,11 @@ def display_page(path):
             logger.debug("title (potentially derived): %s", page_title)
 
             return render('base.html', title=page_title, description=get_meta_str(md, 'description'),
-                      image=get_meta_str(md, 'image'), base_url=request.base_url, content=content, navs=parent_navs,
+                          image=get_meta_str(md, 'image'), base_url=request.base_url, content=content,
-                      mtime=mtime.strftime('%Y-%m-%d %H:%M:%S %Z'))
+                          navs=parent_navs, mtime=mtime.strftime('%Y-%m-%d %H:%M:%S %Z'))
+    else:
+        logger.exception("unsupported render_type '%s'!?", render_type)
+        abort(500)
 
 
 def request_path_to_instance_resource_path(path):
@@ -63,34 +75,52 @@ def request_path_to_instance_resource_path(path):
     """
     # check if the path is allowed
     base_dir = os.path.realpath(f'{app.instance_path}/pages/')
-    resolved_path = os.path.realpath(os.path.join(base_dir, path))
+    verbatim_path = os.path.abspath(os.path.join(base_dir, path))
-    logger.debug("base_dir: %s, constructed resolved_path: %s", base_dir, resolved_path)
+    resolved_path = os.path.realpath(verbatim_path)
+    logger.debug("base_dir '%s', constructed resolved_path '%s' for path '%s'", base_dir, resolved_path, path)
 
     # bail if the requested real path isn't inside the base directory
     if base_dir != os.path.commonpath((base_dir, resolved_path)):
         logger.warning("client tried to request a path '%s' outside of the base_dir!", path)
         raise PermissionError
 
-    # if this is a file-like requset but actually a directory, redirect the user
+    # see if we have a real file or if we should infer markdown rendering
+    if os.path.exists(resolved_path):
+        # if this is a file-like request but actually a directory, redirect the user
         if os.path.isdir(resolved_path) and not path.endswith('/'):
             logger.info("client requested a path '%s' that is actually a directory", path)
             raise IsADirectoryError
 
-    # derive the proper markdown file depending on if this is a dir or file
+        # if the requested path contains a symlink, redirect the user
-    if os.path.isdir(resolved_path):
+        if verbatim_path != resolved_path:
-        absolute_resource = os.path.join(resolved_path, 'index.md')
+            logger.info("client requested a path '%s' that is actually a symlink to file '%s'", path, resolved_path)
-    else:
+            return resolved_path.replace(f'{app.instance_path}{os.path.sep}', ''), 'symlink'
-        absolute_resource = f'{resolved_path}.md'
 
-    logger.info("final path = '%s' for request '%s'", absolute_resource, path)
+        # derive the proper markdown or actual file depending on if this is a dir or file
+        if os.path.isdir(resolved_path):
+            resolved_path = os.path.join(resolved_path, 'index.md')
+            return resolved_path.replace(f'{app.instance_path}{os.path.sep}', ''), 'markdown'
+
+        logger.info("final DIRECT path = '%s' for request '%s'", resolved_path, path)
+        return resolved_path.replace(f'{app.instance_path}{os.path.sep}', ''), 'file'
+
+    # if we're here, this isn't direct file access, so try markdown inference
+    verbatim_path = os.path.abspath(os.path.join(base_dir, f'{path}.md'))
+    resolved_path = os.path.realpath(verbatim_path)
 
     # does the final file actually exist?
-    if not os.path.exists(absolute_resource):
+    if not os.path.exists(resolved_path):
-        logger.warning("requested final path '%s' does not exist!", absolute_resource)
+        logger.warning("requested final path '%s' does not exist!", resolved_path)
         raise FileNotFoundError
 
+    # check for symlinks
+    if verbatim_path != resolved_path:
+        logger.info("client requested a path '%s' that is actually a symlink to file '%s'", path, resolved_path)
+        return resolved_path.replace(f'{app.instance_path}{os.path.sep}', ''), 'symlink'
+
+    logger.info("final path = '%s' for request '%s'", resolved_path, path)
     # we checked that the file exists via absolute path, but now we need to give the path relative to instance dir
-    return absolute_resource.replace(f'{app.instance_path}{os.path.sep}', '')
+    return resolved_path.replace(f'{app.instance_path}{os.path.sep}', ''), 'markdown'
 
 
 def instance_resource_path_to_request_path(path):
@@ -127,8 +157,19 @@ def generate_parent_navs(path):
         md = init_md()
 
         # read the resource
+        try:
             with app.open_instance_resource(path, 'r') as entry_file:
                 entry = entry_file.read()
             _ = Markup(md.convert(entry))
-        page_name = " ".join(md.Meta.get('title')) if md.Meta.get('title') else request_path
+            page_name = (" ".join(md.Meta.get('title')) if md.Meta.get('title')
+                         else request_path_to_breadcrumb_display(request_path))
             return generate_parent_navs(parent_resource_path) + [(page_name, request_path)]
+        except FileNotFoundError:
+            return generate_parent_navs(parent_resource_path) + [(request_path, request_path)]
+
+
+def request_path_to_breadcrumb_display(path):
+    """Given a request path, e.g. "/foo/bar/baz/", turn it into breadcrumby text "baz"."""
+    undired = path.rstrip('/')
+    leaf = undired[undired.rfind('/'):]
+    return leaf.strip('/')

incorporealcms/static/css/dark.css

@@ -1,3 +1,5 @@
+@import '/static/css/base.css';
+
 html {
     color: #CCC;
 }

incorporealcms/static/css/light.css

@@ -1,3 +1,5 @@
+@import '/static/css/base.css';
+
 html {
     color: #222;
 }

incorporealcms/static/css/plain.css

@@ -0,0 +1,8 @@
+
+.img-25 {
+    max-width: 25% !important;
+}
+
+.img-50 {
+    max-width: 50% !important;
+}

incorporealcms/templates/404.html

@@ -10,8 +10,8 @@
 <div class="content">
     <h1>NOT FOUND</h1>
     <p>Sorry, <b><tt>{{ request.path }}</tt></b> does not seem to exist, at least not anymore.</p>
-    <p>It's possible you followed a dead link on this site, in which case I would appreciate it if you could email me via:
+    <p>It's possible you followed a dead link on this site, in which case I would appreciate it if you could email me at
-    bss @ &lt;this domain&gt; and I can take a look. I make an effort to symlink old content to its new location,
+    {{ config.CONTACT_EMAIL }} and I can take a look. I make an effort to symlink old content to its new location,
     so old links and URLs should, generally speaking, work.</p>
     <p>Otherwise, I suggest you go <a href="/">to the index</a> and navigate your way (hopefully) to what
     you're looking for.</p>

incorporealcms/templates/500.html

@@ -9,6 +9,6 @@
 {% block body %}
 <div class="content">
     <h1>INTERNAL SERVER ERROR</h1>
-    <p>Something bad happened! Please email me at bss @ &lt;this domain&gt; and tell me what happened.</p>
+    <p>Something bad happened! Please email me at {{ config.CONTACT_EMAIL }} and tell me what happened.</p>
 </div>
 {% endblock %}

incorporealcms/templates/base.html

@@ -7,9 +7,8 @@
 <meta property="og:url" content="{{ base_url }}">
 <meta name="twitter:card" content="summary_large_image">
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="stylesheet" href="{{ url_for('static', filename='css/style.css') }}">
 <link rel="stylesheet" href="{{ url_for('static', filename=user_style) }}">
-<link rel="icon" href="{{ url_for('static', filename='img/favicon.png') }}">
+<link rel="icon" href="{% if config.FAVICON %}{{ config.FAVICON }}{% else %}{{ url_for('static', filename='img/favicon.png') }}{% endif %}">
 
 <div class="site-wrap">
     {% block header %}
@@ -23,6 +22,7 @@
         <div class="styles">
             <a href="?style=dark">[dark]</a>
             <a href="?style=light">[light]</a>
+            <a href="?style=plain">[plain]</a>
         </div>
     </div>
     {% endblock %}

requirements/requirements-dev.txt

@@ -16,7 +16,7 @@ click==7.1.2
     # via
     #   flask
     #   pip-tools
-coverage==5.4
+coverage==5.5
     # via pytest-cov
 distlib==0.3.1
     # via virtualenv
@@ -30,7 +30,7 @@ flake8-blind-except==0.2.0
     # via -r requirements/requirements-dev.in
 flake8-builtins==1.5.3
     # via -r requirements/requirements-dev.in
-flake8-docstrings==1.5.0
+flake8-docstrings==1.6.0
     # via -r requirements/requirements-dev.in
 flake8-executable==2.1.1
     # via -r requirements/requirements-dev.in
@@ -42,7 +42,7 @@ flake8-logging-format==0.6.0
     # via -r requirements/requirements-dev.in
 flake8-mutable==1.2.0
     # via -r requirements/requirements-dev.in
-flake8==3.8.4
+flake8==3.9.1
     # via
     #   -r requirements/requirements-dev.in
     #   dlint
@@ -53,19 +53,19 @@ flake8==3.8.4
     #   flake8-mutable
 flask==1.1.2
     # via -r requirements/requirements.in
-gitdb==4.0.5
+gitdb==4.0.7
     # via gitpython
-gitpython==3.1.13
+gitpython==3.1.14
     # via bandit
 iniconfig==1.1.1
     # via pytest
-isort==5.7.0
+isort==5.8.0
     # via flake8-isort
 itsdangerous==1.1.0
     # via flask
 jinja2==2.11.3
     # via flask
-markdown==3.3.3
+markdown==3.3.4
     # via
     #   -r requirements/requirements.in
     #   mdx-linkify
@@ -82,7 +82,9 @@ packaging==20.9
     #   tox
 pbr==5.5.1
     # via stevedore
-pip-tools==5.5.0
+pep517==0.10.0
+    # via pip-tools
+pip-tools==6.1.0
     # via -r requirements/requirements-dev.in
 pluggy==0.13.1
     # via
@@ -92,17 +94,17 @@ py==1.10.0
     # via
     #   pytest
     #   tox
-pycodestyle==2.6.0
+pycodestyle==2.7.0
     # via flake8
-pydocstyle==5.1.1
+pydocstyle==6.0.0
     # via flake8-docstrings
-pyflakes==2.2.0
+pyflakes==2.3.1
     # via flake8
 pyparsing==2.4.7
     # via packaging
 pytest-cov==2.11.1
     # via -r requirements/requirements-dev.in
-pytest==6.2.2
+pytest==6.2.3
     # via
     #   -r requirements/requirements-dev.in
     #   pytest-cov
@@ -116,7 +118,7 @@ six==1.15.0
     #   bleach
     #   tox
     #   virtualenv
-smmap==3.0.5
+smmap==4.0.0
     # via gitdb
 snowballstemmer==2.1.0
     # via pydocstyle
@@ -126,11 +128,12 @@ testfixtures==6.17.1
     # via flake8-isort
 toml==0.10.2
     # via
+    #   pep517
     #   pytest
     #   tox
 tox-wheel==0.6.0
     # via -r requirements/requirements-dev.in
-tox==3.22.0
+tox==3.23.0
     # via
     #   -r requirements/requirements-dev.in
     #   tox-wheel
@@ -138,7 +141,7 @@ tzlocal==2.1
     # via -r requirements/requirements.in
 versioneer==0.19
     # via -r requirements/requirements-dev.in
-virtualenv==20.4.2
+virtualenv==20.4.3
     # via tox
 webencodings==0.5.1
     # via bleach

requirements/requirements.txt

@@ -14,7 +14,7 @@ itsdangerous==1.1.0
     # via flask
 jinja2==2.11.3
     # via flask
-markdown==3.3.3
+markdown==3.3.4
     # via
     #   -r requirements/requirements.in
     #   mdx-linkify

tests/functional_tests.py

@@ -1,5 +1,6 @@
 """Test page requests."""
 import re
+from unittest.mock import patch
 
 
 def test_page_that_exists(client):
@@ -9,11 +10,20 @@ def test_page_that_exists(client):
     assert b'<h1>test index</h1>' in response.data
 
 
+def test_direct_file_that_exists(client):
+    """Test that the app can serve a basic file at the index."""
+    response = client.get('/foo.txt')
+    assert response.status_code == 200
+    assert b'test file' in response.data
+
+
 def test_page_that_doesnt_exist(client):
     """Test that the app returns 404 for nonsense requests and they use my error page."""
     response = client.get('/ohuesthaoeusth')
     assert response.status_code == 404
     assert b'<b><tt>/ohuesthaoeusth</tt></b> does not seem to exist' in response.data
+    # test the contact email config
+    assert b'bss@incorporeal.org' in response.data
 
 
 def test_files_outside_pages_do_not_get_served(client):
@@ -28,6 +38,26 @@ def test_internal_server_error_serves_error_page(client):
     response = client.get('/actually-a-png')
     assert response.status_code == 500
     assert b'INTERNAL SERVER ERROR' in response.data
+    # test the contact email config
+    assert b'bss@incorporeal.org' in response.data
+
+
+def test_oserror_is_500(client, app):
+    """Test that an OSError raises as a 500."""
+    with app.test_request_context():
+        with patch('flask.current_app.open_instance_resource', side_effect=OSError):
+            response = client.get('/')
+            assert response.status_code == 500
+            assert b'INTERNAL SERVER ERROR' in response.data
+
+
+def test_unsupported_file_type_is_500(client, app):
+    """Test a coding condition mishap raises as a 500."""
+    with app.test_request_context():
+        with patch('incorporealcms.pages.request_path_to_instance_resource_path', return_value=('foo', 'bar')):
+            response = client.get('/')
+            assert response.status_code == 500
+            assert b'INTERNAL SERVER ERROR' in response.data
 
 
 def test_weird_paths_do_not_get_served(client):
@@ -97,6 +127,44 @@ def test_that_page_request_redirects_to_directory(client):
     """
     response = client.get('/subdir')
     assert response.status_code == 301
+    assert response.location == 'http://localhost/subdir/'
+
+
+def test_that_request_to_symlink_redirects_markdown(client):
+    """Test that a request to /foo redirects to /what-foo-points-at."""
+    response = client.get('/symlink-to-no-title')
+    assert response.status_code == 301
+    assert response.location == 'http://localhost/no-title'
+
+
+def test_that_request_to_symlink_redirects_file(client):
+    """Test that a request to /foo.txt redirects to /what-foo-points-at.txt."""
+    response = client.get('/symlink-to-foo.txt')
+    assert response.status_code == 301
+    assert response.location == 'http://localhost/foo.txt'
+
+
+def test_that_request_to_symlink_redirects_directory(client):
+    """Test that a request to /foo/ redirects to /what-foo-points-at/."""
+    response = client.get('/symlink-to-subdir/')
+    assert response.status_code == 301
+    assert response.location == 'http://localhost/subdir'
+    # sadly, this location also redirects
+    response = client.get('/subdir')
+    assert response.status_code == 301
+    assert response.location == 'http://localhost/subdir/'
+    # but we do get there
+    response = client.get('/subdir/')
+    assert response.status_code == 200
+
+
+def test_that_request_to_symlink_redirects_subdirectory(client):
+    """Test that a request to /foo/bar redirects to /what-foo-points-at/bar."""
+    response = client.get('/symlink-to-subdir/page-no-title')
+    assert response.status_code == 301
+    assert response.location == 'http://localhost/subdir/page-no-title'
+    response = client.get('/subdir/page-no-title')
+    assert response.status_code == 200
 
 
 def test_that_dir_request_does_not_redirect(client):

tests/instance/pages/foo.txt

@@ -0,0 +1 @@
+test file

tests/instance/pages/no-index-dir/page.md

@@ -0,0 +1 @@
+this is a test page

tests/instance/pages/symlink-to-foo.txt

@@ -0,0 +1 @@
+foo.txt

tests/instance/pages/symlink-to-no-title.md

@@ -0,0 +1 @@
+no-title.md

tests/instance/pages/symlink-to-subdir

@@ -0,0 +1 @@
+subdir

tests/test_factory.py

@@ -58,3 +58,13 @@ def test_media_file_access(client):
     response = client.get('/media/favicon.png')
     assert response.status_code == 200
     assert response.headers['content-type'] == 'image/png'
+
+
+def test_favicon_override():
+    """Test that a configuration with a specific favicon overrides the default."""
+    instance_path = os.path.join(HERE, 'instance')
+    app = create_app(instance_path=instance_path, test_config={'FAVICON': '/media/foo.png'})
+    client = app.test_client()
+    response = client.get('/no-title')
+    assert response.status_code == 200
+    assert b'<link rel="icon" href="/media/foo.png">' in response.data

tests/test_pages.py

@@ -3,7 +3,7 @@ import pytest
 from werkzeug.http import dump_cookie
 
 from incorporealcms.pages import (generate_parent_navs, instance_resource_path_to_request_path, render,
-                                  request_path_to_instance_resource_path)
+                                  request_path_to_breadcrumb_display, request_path_to_instance_resource_path)
 
 
 def test_generate_page_navs_index(app):
@@ -15,13 +15,13 @@ def test_generate_page_navs_index(app):
 def test_generate_page_navs_subdir_index(app):
     """Test that dir pages have navs to the root and themselves."""
     with app.app_context():
-        assert generate_parent_navs('pages/subdir/index.md') == [('incorporeal.org', '/'), ('/subdir/', '/subdir/')]
+        assert generate_parent_navs('pages/subdir/index.md') == [('incorporeal.org', '/'), ('subdir', '/subdir/')]
 
 
 def test_generate_page_navs_subdir_real_page(app):
     """Test that real pages have navs to the root, their parent, and themselves."""
     with app.app_context():
-        assert generate_parent_navs('pages/subdir/page.md') == [('incorporeal.org', '/'), ('/subdir/', '/subdir/'),
+        assert generate_parent_navs('pages/subdir/page.md') == [('incorporeal.org', '/'), ('subdir', '/subdir/'),
                                                                 ('Page', '/subdir/page')]
 
 
@@ -31,7 +31,17 @@ def test_generate_page_navs_subdir_with_title_parsing_real_page(app):
         assert generate_parent_navs('pages/subdir-with-title/page.md') == [
             ('incorporeal.org', '/'),
             ('SUB!', '/subdir-with-title/'),
-            ('/subdir-with-title/page', '/subdir-with-title/page')
+            ('page', '/subdir-with-title/page')
+        ]
+
+
+def test_generate_page_navs_subdir_with_no_index(app):
+    """Test that breadcrumbs still generate even if a subdir doesn't have an index.md."""
+    with app.app_context():
+        assert generate_parent_navs('pages/no-index-dir/page.md') == [
+            ('incorporeal.org', '/'),
+            ('/no-index-dir/', '/no-index-dir/'),
+            ('page', '/no-index-dir/page')
         ]
 
 
@@ -60,44 +70,45 @@ def test_render_with_no_user_theme(app):
 def test_request_path_to_instance_resource_path(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
-        assert request_path_to_instance_resource_path('index') == 'pages/index.md'
+        assert request_path_to_instance_resource_path('index') == ('pages/index.md', 'markdown')
 
 
 def test_request_path_to_instance_resource_path_direct_file(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
-        assert request_path_to_instance_resource_path('no-title') == 'pages/no-title.md'
+        assert request_path_to_instance_resource_path('no-title') == ('pages/no-title.md', 'markdown')
 
 
 def test_request_path_to_instance_resource_path_in_subdir(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
-        assert request_path_to_instance_resource_path('subdir/page') == 'pages/subdir/page.md'
+        assert request_path_to_instance_resource_path('subdir/page') == ('pages/subdir/page.md', 'markdown')
 
 
 def test_request_path_to_instance_resource_path_subdir_index(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
-        assert request_path_to_instance_resource_path('subdir/') == 'pages/subdir/index.md'
+        assert request_path_to_instance_resource_path('subdir/') == ('pages/subdir/index.md', 'markdown')
 
 
 def test_request_path_to_instance_resource_path_relatives_walked(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
         assert (request_path_to_instance_resource_path('subdir/more-subdir/../../more-metadata') ==
-                'pages/more-metadata.md')
+                ('pages/more-metadata.md', 'markdown'))
 
 
 def test_request_path_to_instance_resource_path_relatives_walked_indexes_work_too(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
-        assert request_path_to_instance_resource_path('subdir/more-subdir/../../') == 'pages/index.md'
+        assert request_path_to_instance_resource_path('subdir/more-subdir/../../') == ('pages/index.md', 'markdown')
 
 
 def test_request_path_to_instance_resource_path_relatives_walked_into_subdirs_also_fine(app):
     """Test a normal URL request is transformed into the file path."""
     with app.test_request_context():
-        assert request_path_to_instance_resource_path('subdir/more-subdir/../../subdir/page') == 'pages/subdir/page.md'
+        assert (request_path_to_instance_resource_path('subdir/more-subdir/../../subdir/page') ==
+                ('pages/subdir/page.md', 'markdown'))
 
 
 def test_request_path_to_instance_resource_path_permission_error_on_ref_above_pages(app):
@@ -114,6 +125,41 @@ def test_request_path_to_instance_resource_path_isadirectory_on_file_like_req_fo
             assert request_path_to_instance_resource_path('subdir')
 
 
+def test_request_path_to_instance_resource_path_actual_file(app):
+    """Test that a request for e.g. '/foo.png' when foo.png is a real file works."""
+    with app.test_request_context():
+        assert (request_path_to_instance_resource_path('bss-square-no-bg.png') ==
+                ('pages/bss-square-no-bg.png', 'file'))
+
+
+def test_request_path_to_instance_resource_path_markdown_symlink(app):
+    """Test that a request for e.g. '/foo' when foo.md is a symlink to another .md file redirects."""
+    with app.test_request_context():
+        assert (request_path_to_instance_resource_path('symlink-to-no-title') ==
+                ('pages/no-title.md', 'symlink'))
+
+
+def test_request_path_to_instance_resource_path_file_symlink(app):
+    """Test that a request for e.g. '/foo' when foo.txt is a symlink to another .txt file redirects."""
+    with app.test_request_context():
+        assert (request_path_to_instance_resource_path('symlink-to-foo.txt') ==
+                ('pages/foo.txt', 'symlink'))
+
+
+def test_request_path_to_instance_resource_path_dir_symlink(app):
+    """Test that a request for e.g. '/foo' when /foo is a symlink to /bar redirects."""
+    with app.test_request_context():
+        assert (request_path_to_instance_resource_path('symlink-to-subdir/') ==
+                ('pages/subdir', 'symlink'))
+
+
+def test_request_path_to_instance_resource_path_subdir_symlink(app):
+    """Test that a request for e.g. '/foo/baz' when /foo is a symlink to /bar redirects."""
+    with app.test_request_context():
+        assert (request_path_to_instance_resource_path('symlink-to-subdir/page-no-title') ==
+                ('pages/subdir/page-no-title.md', 'symlink'))
+
+
 def test_request_path_to_instance_resource_path_nonexistant_file_errors(app):
     """Test that a request for something not on disk errors."""
     with app.test_request_context():
@@ -155,10 +201,21 @@ def test_instance_resource_path_to_request_path_on_subdir_and_page(app):
 def test_request_resource_request_root(app):
     """Test that a request can resolve to a resource and back to a request."""
     with app.test_request_context():
-        instance_resource_path_to_request_path(request_path_to_instance_resource_path('index')) == ''
+        instance_path, _ = request_path_to_instance_resource_path('index')
+        instance_resource_path_to_request_path(instance_path) == ''
 
 
 def test_request_resource_request_page(app):
     """Test that a request can resolve to a resource and back to a request."""
     with app.test_request_context():
-        instance_resource_path_to_request_path(request_path_to_instance_resource_path('no-title')) == 'no-title'
+        instance_path, _ = request_path_to_instance_resource_path('no-title')
+        instance_resource_path_to_request_path(instance_path) == 'no-title'
+
+
+def test_request_path_to_breadcrumb_display_patterns():
+    """Test various conversions from request path to leaf nodes for display in the breadcrumbs."""
+    assert request_path_to_breadcrumb_display('/foo') == 'foo'
+    assert request_path_to_breadcrumb_display('/foo/') == 'foo'
+    assert request_path_to_breadcrumb_display('/foo/bar') == 'bar'
+    assert request_path_to_breadcrumb_display('/foo/bar/') == 'bar'
+    assert request_path_to_breadcrumb_display('/') == ''