* Make sure sibling images get a link too
Due a problem with the ast.Walker in the our transformer in goldmark
an image with a sibling image will not be transformed to gain a parent
link. This PR fixes this.
Fix #12925
Signed-off-by: Andrew Thornton <art27@cantab.net>
PostProcess is supposed to be parsing and handling HTML
fragments, but on fuzzing it appears that there is a weird
issue with NUL elements that could cause a memory address
error in downstream libraries.
The simplest solution is to strip out the weird NULs - they
should not be there in any case and would be stripped out
anyway.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Prevent panic on fuzzer provided string
The fuzzer has found that providing a <body> tag with an attribute to
PostProcess causes a panic. This PR removes any rendered html or body
tags from the output.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Placate lint
* placate lint again
Signed-off-by: Andrew Thornton <art27@cantab.net>
* minor cleanup
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Markdown task list improvements
- Remove `.ui` class and wrappers to prevent fomantic from messing with it.
- Change rendered HTML to match GitHub.
- Add custom styling for the checkboxes.
* fix unittest
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
* clickable links in pull request (and issue) titles #13658
reuses the existing logic to render clickable links in commit messages
* dedicated RenderIssueTitle function
applied patch from @mrsdizzie
This PR updates golangci-lint to the latest version 1.31.0.
The upgrade introduced a new check for which I've fixed or disabled most cases.
Signed-off-by: kolaente <k@knt.li>
* fix: media links in org files not liked to media files
* fix: write directly to io.Writer r
as suggested by code review
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: zeripath <art27@cantab.net>
* Fix meta parsing and add minimal test
Signed-off-by: jolheiser <john.olheiser@gmail.com>
* Add license
Signed-off-by: jolheiser <john.olheiser@gmail.com>
* Require first separator and add more tests
Signed-off-by: jolheiser <john.olheiser@gmail.com>
* Make fmt
Signed-off-by: jolheiser <john.olheiser@gmail.com>
* Go lets this work gracefully 🙏
Signed-off-by: jolheiser <john.olheiser@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
* Update to go-org 1.3.2
Fix #12727
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Fix unit test
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
- Fix emoji not being replaced in issue title change text
- Make the image attributes consistent, add alt, remove align
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Replace all calls to os.Remove/os.RemoveAll by retrying util.Remove/util.RemoveAll and remove circular dependencies from util.
Fix #12339
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: silverwind <me@silverwind.io>
- Add loading spinners on editor and mermaid renderers
- Add error handling and inline error box for mermaid
- Fix Mermaid rendering by using the .init api
* Fix emoji detection certain cases
Previous tests weren't complicated enough so there were some situations where emojis were't detected properly. Find the earliest occurance in addition to checking for the longest combination.
Fixes #12312
* ok spell bot
Co-authored-by: Lauris BH <lauris@nix.lv>
* Server-side syntax hilighting for all code
This PR does a few things:
* Remove all traces of highlight.js
* Use chroma library to provide fast syntax hilighting directly on the server
* Provide syntax hilighting for diffs
* Re-style both unified and split diffs views
* Add custom syntax hilighting styling for both regular and arc-green
Fixes #7729
Fixes #10157
Fixes #11825
Fixes #7728
Fixes #3872
Fixes #3682
And perhaps gets closer to #9553
* fix line marker
* fix repo search
* Fix single line select
* properly load settings
* npm uninstall highlight.js
* review suggestion
* code review
* forgot to call function
* fix test
* Apply suggestions from code review
suggestions from @silverwind thanks
Co-authored-by: silverwind <me@silverwind.io>
* code review
* copy/paste error
* Use const for highlight size limit
* Update web_src/less/_repository.less
Co-authored-by: Lauris BH <lauris@nix.lv>
* update size limit to 1MB and other styling tweaks
* fix highlighting for certain diff sections
* fix test
* add worker back as suggested
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Lauris BH <lauris@nix.lv>
* Disable all typographic replacements in markdown renderer
Previously we only disabled some of them. This disables all the default
replacements that goldmark's typographer extension offers, matching
GitHub's renderer.
Ref: https://github.com/yuin/goldmark#typographer-extension
Fixes: https://github.com/go-gitea/gitea/issues/11001
* remove typographer extension completely
* fix test
* really fix test
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
When matching emoji, use a regex built from the data we have instead of something generic using unicode ranges. A generic regex can't tell the difference between two separate emoji next to each other or one emoji that is built out of two separate emoji next to each other.
This means that emoji that are next to each other without space in between will be now accurately spanned individually with proper title etc...
GH has different HardBreaks behaviour for markdown comments and documents.
Comments have hard breaks and documents have soft breaks - therefore Gitea's rendering will always be different from GH's if we only provide one setting.
Here we split the setting in to two - one for documents and one for comments and other things.
Signed-off-by: Andrew Thornton art27@cantab.net
Changes to index.js as per @silverwind
Co-authored-by: silverwind <me@silverwind.io>
Changes to docs as per @guillep2k
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
* Add test
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Restore checkbox rendering and prevent poor sanitization of spans
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Also fix preview context
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Also fix preview context
Signed-off-by: Andrew Thornton <art27@cantab.net>
Now that emojify.js has been removed, get rid of all instances of has-emoji class that was only used for that. Support for rendering shortcodes should remain in all of these places so it should still work the same.
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
* Support unicode emojis and remove emojify.js
This PR replaces all use of emojify.js and adds unicode emoji support to various areas of gitea.
This works in a few ways:
First it adds emoji parsing support into gitea itself. This allows us to
* Render emojis from valid alias (😄)
* Detect unicode emojis and let us put them in their own class with proper aria-labels and styling
* Easily allow for custom "emoji"
* Support all emoji rendering and features without javascript
* Uses plain unicode and lets the system render in appropriate emoji font
* Doesn't leave us relying on external sources for updates/fixes/features
That same list of emoji is also used to create a json file which replaces the part of emojify.js that populates the emoji search tribute. This file is about 35KB with GZIP turned on and I've set it to load after the page renders to not hinder page load time (and this removes loading emojify.js also)
For custom "emoji" it uses a pretty simple scheme of just looking for /emojis/img/name.png where name is something a user has put in the "allowed reactions" setting we already have. The gitea reaction that was previously hard coded into a forked copy of emojify.js is included and works as a custom reaction under this method.
The emoji data sourced here is from https://github.com/github/gemoji which is the gem library Github uses for their emoji rendering (and a data source for other sites). So we should be able to easily render any emoji and :alias: that Github can, removing any errors from migrated content. They also update it as well, so we can sync when there are new unicode emoji lists released.
I've included a slimmed down and slightly modified forked copy of https://github.com/knq/emoji to make up our own emoji module. The code is pretty straight forward and again allows us to have a lot of flexibility in what happens.
I had seen a few comments about performance in some of the other threads if we render this ourselves, but there doesn't seem to be any issue here. In a test it can parse, convert, and render 1,000 emojis inside of a large markdown table in about 100ms on my laptop (which is many more emojis than will ever be in any normal issue). This also prevents any flickering and other weirdness from using javascript to render some things while using go for others.
Not included here are image fall back URLS. I don't really think they are necessary for anything new being written in 2020. However, managing the emoji ourselves would allow us to add these as a feature later on if it seems necessary.
Fixes: https://github.com/go-gitea/gitea/issues/9182
Fixes: https://github.com/go-gitea/gitea/issues/8974
Fixes: https://github.com/go-gitea/gitea/issues/8953
Fixes: https://github.com/go-gitea/gitea/issues/6628
Fixes: https://github.com/go-gitea/gitea/issues/5130
* add new shared function emojiHTML
* don't increase emoji size in issue title
* Update templates/repo/issue/view_content/add_reaction.tmpl
Co-Authored-By: 6543 <6543@obermui.de>
* Support for emoji rendering in various templates
* Render code and review comments as they should be
* Better way to handle mail subjects
* insert unicode from tribute selection
* Add template helper for plain text when needed
* Use existing replace function I forgot about
* Don't include emoji greater than Unicode Version 12
Only include emoji and aliases in JSON
* Update build/generate-emoji.go
* Tweak regex slightly to really match everything including random invisible characters. Run tests for every emoji we have
* final updates
* code review
* code review
* hard code gitea custom emoji to match previous behavior
* Update .eslintrc
Co-Authored-By: silverwind <me@silverwind.io>
* disable preempt
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>
* Prevent panic during wrappedConn close at hammertime
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Update modules/graceful/server.go
* Fix extraneous debug in goldmark.go
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Fix checkbox rendering
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Normalize checkbox rendering
Signed-off-by: Andrew Thornton <art27@cantab.net>
* set the checkboxes to readonly instead of disabled
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
* Add control for the rendering of the frontmatter
* Add control to include a TOC
* Add control to set language - allows control of ToC header and CJK glyph choice.
Signed-off-by: Andrew Thornton art27@cantab.net
Annoyingly goldmarks SetAttributeString requires that
the value of the attribute is still a []byte but does
not make it clear in the documentation.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Fix task-list checkbox styling
The pandoc renderer will append the class "task-list" to the ul element
wrapping a li with one or more check-boxes. This allows us to select for
them, removing their list-style-type property. However, goldmark and the
gfm spec doesn't specify the "task-list" class name, so we can't use
that to fix the issue there.
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Update to goldmark v1.1.25
This version adds the missing space after a checkbox.
Resolves: #9656
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>
* Don't manually replace whitespace during render
For historical reasons Gitea manually alters the urlPrefix and replaces
a whitespace with a +. This Works for URLs, but we're also passing
urlPrefix to git calls and adding the + is breaking the tree path.
Goldmark will automatically convert a white space to the proper %20, so
we should leave the string as is which lets us pass it to git unmodified
and then let Goldmark fix it.
Also fixed separate bug in URLJoin I noticed while testing where it will
silently discard sections of a path that have # in them (possibly
others). We should just escape it first.
Fixes 10156
* Escape elems as well
* Revert "Escape elems as well"
This reverts commit 8bf49596fee6fac4d9da256cd1e90a0ec0183671.
* restart ci
* remove changes to URLJoin
* restart ci
Co-authored-by: techknowlogick <matti@mdranta.net>
* Move to goldmark
Markdown rendering moved from blackfriday to the goldmark.
Multiple subtle changes required to the goldmark extensions to keep
current rendering and defaults.
Can go further with goldmark linkify and have this work within markdown
rendering making the link processor unnecessary.
Need to think about how to go about allowing extensions - at present it
seems that these would be hard to do without recompilation.
* linter fixes
Co-authored-by: Lauris BH <lauris@nix.lv>
* Prefix all user-generated IDs in markup
* Add user-content- to IDs in unit-tests
* fixup markdown_test.go
* update the hrefs for the wiki test
* Add blackfriday extension regex
Signed-off-by: jolheiser <john.olheiser@gmail.com>
* Support custom sanitization policy
Allowing the gitea administrator to configure sanitization policy allows
them to couple external renders and custom templates to support more
markup. In particular, the `pandoc` renderer allows generating KaTeX
annotations, wrapping them in `<span>` elements with class `math` and
either `inline` or `display` (depending on whether or not inline or
block mode was requested).
This iteration gives the administrator whitelisting powers; carefully
crafted regexes will thus let through only the desired attributes
necessary to support their custom markup.
Resolves: #9054
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Document new sanitization configuration
- Adds basic documentation to app.ini.sample,
- Adds an example to the Configuration Cheat Sheet, and
- Adds extended information to External Renderers section.
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Drop extraneous length check in newMarkupSanitizer(...)
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Fix plural ELEMENT and ALLOW_ATTR in docs
These were left over from their initial names. Make them singular to
conform with the current expectations.
Signed-off-by: Alexander Scheel <alexander.m.scheel@gmail.com>
* Add support for local vs. remote xrefs
* Add doc for references
* Docs: fix cases not currently supported
* One more doc fix
* Doc: mentions for teams and orgs
* Change !num ref concept, no change in functionality
* Fix test
* Improve table of issue reference types
* Fix paragraph mark
* Convert EOL to UNIX-style to render MD properly
* Update modules/markup/markdown/markdown.go
Co-Authored-By: zeripath <art27@cantab.net>
* Fix lint optimization
* Check for empty content before conversion
* Update modules/util/util.go
Co-Authored-By: zeripath <art27@cantab.net>
* Improved checks and tests
* Add paragraph render test
* Improve speed even more, improve tests
* Small improvement by @gary-kim
* Fix test for DOS
* More improvements
* Restart CI
* Make link last commit massages in repository home page and commit tables
* Use RenderCommitMessageLink instead surround with a
* deleted __debug_bin file
* Exclude email to link from latest commit title
* Exclude email processor from commit table
Co-Authored-By: mrsdizzie <info@mrsdizzie.com>
* Add class parameter to a html element creator functions.
Make links underline dashed that are not commit
* fix tests
* Show dashed underline when also not hovered
* feat: highlight issue references with :
e.g. #1287: my commit msg
e.g. ABC-1234: my commit msg
* ref: update model regex to consistent with issueNumericPattern
* test: check highlight issue with : in commits messages
* detect csv delimiter in csv rendering
fixes #7868
* make linter happy
* fix failing testcase & use ints where possible
* expose markup type to template
previously all markup had the .markdown class, which is incorrect,
as it applies markdown CSS & JS logic to CSV rendering
* fix build (missing `make css`)
* ignore quoted csv content for delimiter scoring
also fix html generation
* Check commit message hashes before making links
Previously, when formatting commit messages, anything
that looked like SHA1 hashes was turned into a link
using regex. This meant that certain phrases or numbers
such as `777777` or `deadbeef` could be recognized as a commit
even if the repository has no commit with those hashes.
This change will make it so that anything that looks
like a SHA1 hash using regex will then also be checked
to ensure that there is a commit in the repository
with that hash before making a link.
Signed-off-by: Gary Kim <gary@garykim.dev>
* Use gogit to check if commit exists
This commit modifies the commit hash check
in the render for commit messages to use
gogit for better performance.
Signed-off-by: Gary Kim <gary@garykim.dev>
* Make code cleaner
Signed-off-by: Gary Kim <gary@garykim.dev>
* Use rev-parse to check if commit exists
Signed-off-by: Gary Kim <gary@garykim.dev>
* Add and modify tests for checking hashes in html link rendering
Signed-off-by: Gary Kim <gary@garykim.dev>
* Return error in sha1CurrentPatternProcessor
Co-Authored-By: mrsdizzie <info@mrsdizzie.com>
* Import Gitea log module
Signed-off-by: Gary Kim <gary@garykim.dev>
* Revert "Return error in sha1CurrentPatternProcessor"
This reverts commit 28f561cac46ef7e51aa26aefcbe9aca4671366a6.
Signed-off-by: Gary Kim <gary@garykim.dev>
* Add debug logging to sha1CurrentPatternProcessor
This will log errors by the git command run in
sha1CurrentPatternProcessor if the error is one
that was unexpected.
Signed-off-by: Gary Kim <gary@garykim.dev>
Since #6273 was merged, we now have access to proper context metas
always. Update SHA generated links to use these instead of urlPrefix.
Update tests as well.
Fixes #4536.
* Improve issue autolinks
Update autolinks to match what github does here:
Issue in same repo: #1
Issue in different repo: org/repo#1
Fixes #6264
* Use setting.AppURL when parsing URL
Using setting.AppURL here is a more reliable way of parsing the current
URL and what other functions in this file seem to use.
* Make ComposeMetas always return a valid context
* Add per repository markdown renderers for better context
* Update for use of context metas
Now that we include the user and repo name inside context metas, update
various code and tests for this new logic
* Use stricter boundaries for auto-link detection
Currently autolinks use \W for boundary detection which creates many
situations of inserting links into places they don't belong (paths,
URLs, UUIDs, etc...)
This fixes that by replacing \W and only allowing these matches to touch
an open paren or bracket (matching what seems to be Github behavior) in
addition to whitespace and start of line. Similar for ending boundary as
well.
Fixes #6149
(and probably others)
* Update test
Replace incorrect test with a value that is a valid username, based on:
"Username should contain only alphanumeric, dash ('-'), underscore ('_')
and dot ('.') characters."
* Also allow for period at the end
Matching Github behavior
* Fix email regex to work properly with specificed boundaries
Create a specific capture group for email address and then use
FindStringSubmatchIndex to allow for non-matching patterns as
boundaries.
* Add Tests
Add tests for new behavior -- including tests for email addresses which
were absent before.
This improves the SHA1 link detection to not pick up extraneous
non-whitespace characters at the end of the URL. The '.' is a special
case handled in code itself because of missing regexp lookahead
support.
Regex test cases: https://regex101.com/r/xUMlqh/3
* Panic don't fatal on create new logger
Fixes #5854
Signed-off-by: Andrew Thornton <art27@cantab.net>
* partial broken
* Update the logging infrastrcture
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Reset the skip levels for Fatal and Error
Signed-off-by: Andrew Thornton <art27@cantab.net>
* broken ncsa
* More log.Error fixes
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Remove nal
* set log-levels to lowercase
* Make console_test test all levels
* switch to lowercased levels
* OK now working
* Fix vetting issues
* Fix lint
* Fix tests
* change default logging to match current gitea
* Improve log testing
Signed-off-by: Andrew Thornton <art27@cantab.net>
* reset error skip levels to 0
* Update documentation and access logger configuration
* Redirect the router log back to gitea if redirect macaron log but also allow setting the log level - i.e. TRACE
* Fix broken level caching
* Refactor the router log
* Add Router logger
* Add colorizing options
* Adjust router colors
* Only create logger if they will be used
* update app.ini.sample
* rename Attribute ColorAttribute
* Change from white to green for function
* Set fatal/error levels
* Restore initial trace logger
* Fix Trace arguments in modules/auth/auth.go
* Properly handle XORMLogger
* Improve admin/config page
* fix fmt
* Add auto-compression of old logs
* Update error log levels
* Remove the unnecessary skip argument from Error, Fatal and Critical
* Add stacktrace support
* Fix tests
* Remove x/sync from vendors?
* Add stderr option to console logger
* Use filepath.ToSlash to protect against Windows in tests
* Remove prefixed underscores from names in colors.go
* Remove not implemented database logger
This was removed from Gogs on 4 Mar 2016 but left in the configuration
since then.
* Ensure that log paths are relative to ROOT_PATH
* use path.Join
* rename jsonConfig to logConfig
* Rename "config" to "jsonConfig" to make it clearer
* Requested changes
* Requested changes: XormLogger
* Try to color the windows terminal
If successful default to colorizing the console logs
* fixup
* Colorize initially too
* update vendor
* Colorize logs on default and remove if this is not a colorizing logger
* Fix documentation
* fix test
* Use go-isatty to detect if on windows we are on msys or cygwin
* Fix spelling mistake
* Add missing vendors
* More changes
* Rationalise the ANSI writer protection
* Adjust colors on advice from @0x5c
* Make Flags a comma separated list
* Move to use the windows constant for ENABLE_VIRTUAL_TERMINAL_PROCESSING
* Ensure matching is done on the non-colored message - to simpify EXPRESSION
* Migrate to go modules
* make vendor
* Update mvdan.cc/xurls
* make vendor
* Update code.gitea.io/git
* make fmt-check
* Update github.com/go-sql-driver/mysql
* make vendor
* Markdown: enable some more extensions
Improve Markdown-rendering by enabling some extensions:
- enable definitions lists
- enable footnotes
- enable header-ids and automatically generate header-ids (for linking to README-sections or creating table-of-contents for larger READMEs)
* Markdown: update and exted tests
Update and add tests for additionally enabled Markdown-extensions.
* Replace linkRegex with xurls library
Rather than maintaining a complicated regex to match URLs for
autolinking, gitea can use this existing go library that takes care of
the matching with very little code change to gitea itself. After
spending a while trying to find the perfect regex for all cases this library
still works better as it is more flexible than a single regex ever will be.
This will also fix the following issues: #5844#3095#3381
This passes all our current tests and I've added new ones mentioned in
those issues as well.
* Use xurls.StrictMatchingScheme instead of xurls.Strict
This is much faster and we only care about https? links to preserve
existing behavior.
The visitLinksForShortLinks feature would look inside of an <a> tag and
run shortLinkProcessorFull on any text, which attempts to create links
out of potential 'short links' like [[test]] [[link|example]] etc...
This makes no sense because you can't have nested links within an <a>
tag. Specifically, the html5 standard says <a> tags can't include
interactive content if they contain the href attribute:
http://w3c.github.io/html/single-page.html#the-a-element
And also defines an <a> element with a href attribute as interactive:
http://w3c.github.io/html/single-page.html#interactive-content
Therefore you can't really put a link inside of another link. In
practice none of this works anyways since browsers won't render it, it
would probably be broken if they tried, and it is causing a bug
(#4946). No current tests rely on this behavior either.
This removes the feature and also explicitly excludes the
current visitNodeForShortLinks from looking in <a> tags.
Modify the current linkRegex to require http|https which appears to be
the intended behavior based on the comments. Right now, it also matches
anything starting with www as well. Also add testing for linkRegex
This PR makes it possible for the markdown renderer to render images and media straight from the LFS.
Fix #5746
Signed-off-by: Andrew Thornton [art27@cantab.net](mailto:art27@cantab.net)
This PR protects against the panic referred to in chaseadmsio/goorgeous#82
by recovering from the panic and just returning the raw bytes if
there is an error.
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Pass environment variables for URL prefixes to external markup parser
Signed-off-by: Nicolas Lenz <nicolas@eisfunke.com>
* Document external markup link prefix environment variables
Signed-off-by: Nicolas Lenz <nicolas@eisfunke.com>
* Run format on link prefix changes
Signed-off-by: Nicolas Lenz <nicolas@eisfunke.com>
* Get rid of autolink
* autolink in markdown
* Replace email addresses with mailto links
* better handling of links
* Remove autolink.js from footer
* Refactor entire html.go
* fix some bugs
* Make tests green, move what we can to html_internal_test, various other changes to processor logic
* Make markdown tests work again
This is just a description to allow me to force push in order to restart
the drone build.
* Fix failing markdown tests in routers/api/v1/misc
* Add license headers, log errors, future-proof <body>
* fix formatting
* add init support of orgmode document type on file view and readme
* fix imports
* fix imports and readmeExist
* fix imports order
* fix format
* remove unnecessary convert
* restructure markup & markdown to prepare for multiple markup languages support
* adjust some functions between markdown and markup
* fix tests
* improve the comments
* markup: microoptimise for many short filenames in directory
Move strings.ToLower() after the early-return length check. This is a safe operation in all cases and should slightly improve directory listing performance when a directory contains many thousands of files with short filenames.
* markup: expand test cases for IsReadmeFile()
