- Add basic frontend unit testing infrastructure using jest in ESM mode
- Rename 'make test' to 'make test-backend'
- Introduce 'make test-frontend' and 'make test' that runs both
- Bump Node.js requirement to v12. v10 will be EOL in less than a month.
- Convert all build-related JS files to ESM.

I opted to run frontend tests run as part of the compliance pipeline because
they complete fast and are not platform-specific like the golang tests.

jQuery 3.6.0 seems to have broke the dropdown focus handling (focus
would get stuck on the dropdown) in this module which we have vendored
on top of fomantic for accessibility improvements.

Either downgrading jQuery to 3.5.1 or removing the vendor copy seems to
resolve the issue and I opted for removing the copy because I think such
changes should be done upstream and the removal also lightens the JS by
155kB before minify/gzip.

Fixes: https://github.com/go-gitea/gitea/issues/15172

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Update JS dependencies

- Update all JS dependencies
- For octicons, rename trashcan to trash
- For svgo, migrate to v2 api, output seems to have slightly changed but icons look the same
- For stylelint, update config, fix custom property duplicates
- For monaco, drop legacy Edge support
- For eslint, enable new rules, fix new issues
- For less-loader, remove deprecated import syntax

* update svgo usage in generate-images and rebuild logo.svg with it

* Update JS dependencies

- Update all JS dependencies
- Adapt webpack config for version 5
- Update to Less 4.0, adapting usage of removed mixin syntax
- Enable new ESLint rules and fix discovered issues

* update license-webpack-plugin to fix missing licenses

* update license-webpack-plugin once more to get webpack into the license output

* switch to license-checker-webpack-plugin again for performance

* update deps again

Co-authored-by: Lauris BH <lauris@nix.lv>

* Update JS dependencies and misc tweaks

- Update all JS dependencies minus webpack
- Adapt CodeMirrors styling to new CSS parent introduced by EasyMDE
- Set eslint parser to latest and add new eslint 7.14 rule
- Speed up npm install by disabling audit and fund checks
- Move fomantic-ui to optional dependencies to further speed up npm
- Enable syntax highlighting on GH for .eslintrc and .stylelintrc
- Makefile cleanups

* disable audit in npmrc

* add missing dash

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Indentation-related rules are disabled because indent templates with
tabs but our lint rules expect spaces.

Also had to exclude a few files where using template variables in the JS
is causing syntax errors for the JS parser. I don't think there's a way
to solve this otherwise.

Co-authored-by: Lauris BH <lauris@nix.lv>

* Add Vue linting

Turns out the .vue files were not linted at all, so I added that as well
as re-indented the file to 2-space and fixed all reasonable issues that
cam up except one case of a unintended side effect for which I have no
idea how to fix it, so the rule was disabled.

* misc tweaks

* update lockfile

* use overrides to include .vue files

* treat warnings as errors on lint-frontend

* also treat stylelint warnings as errors

* use equal sign syntax

Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

* Update some JS dependencies

- Update selective dependencies that are compatible with webpack 4. We
can not upgrade to webpack 5 yet because `license-webpack-plugin` is
incompatible.
- Enable a few new eslint rules and fix new issues

* fix comment

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: zeripath <art27@cantab.net>

- Added some new octicons
- Add explicit less dependency as required by upstream
- Enable es2021 environment in eslint

- Remove unneeded "Tribute" global
- Separate Node and Browser environments
- Update environment to es2020 to enable new globals like "BigInt"

- update js deps to latest versions
- remove eslint-plugin-sonarjs to prevent a warning on install. can be
  added again once it's updated to support eslint 7.x
- enable new linting rules from eslint-plugin-unicorn

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Rework 'make generate-images'

- Remove external dependencies and replace it with a node script that
  does does the same.
- Move detail removal from gitea-sm.png to favicon.png
- Remove favicon.ico and its generation, it is unused and we already serve
  favicon.png in its place.

Fixes: https://github.com/go-gitea/gitea/issues/12314

* use proper centering value for preserveAspectRatio

* fix lint

* use fabric

* better linting fix

* fix typo

* mention detail-remove class in docs

- Update all dependencies excluding octicons
- Configure new eslint 7.3.0 rules

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

This gets the config closer to what 1.12 had.

Related: https://github.com/go-gitea/gitea/pull/12129

Move EventSource to use a SharedWorker. This prevents issues with HTTP/1.1
open browser connections from preventing gitea from opening multiple tabs.

Also allow setting EVENT_SOURCE_UPDATE_TIME to disable EventSource updating

Fix #11978

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* rework eslint config

- use explicit config that only enables rules
- upgrade eslint to 7.1.0
- add new plugins with selected rules enabled
- fix discovered issues, remove global wipPrefixes

* remove if

* undo template change

* add disabled rules as well for easier config updating

* add missing disabled rule

* update eslint and plugins

* fix new violation

* remove deprecated rules

Co-authored-by: Lauris BH <lauris@nix.lv>

* Fix serviceworker output file and misc improvements

- Fix output file location for production build
- Cache more asset types: fonts and worker variants
- Parallelize a few tasks during initalization
- Only invalidate caches starting with our prefix
- Remove public/serviceworker.js before building
- Remove font preloads, they cause strange cors issues
- Misc eslint config adjustments

* remove webpack output files on watch-frontend

* Move serviceworker to workbox and fix SSE interference

Instead of statically hardcoding every frontend asset, this uses a
type-based approach to cache all js,css and manifest.json requests.

This also fixes the issue that the service worker was interfering with
EventSource because it was unconditionally handling all requests which
this new implementation doesn't.

Fixes: https://github.com/go-gitea/gitea/issues/11092
Fixes: https://github.com/go-gitea/gitea/issues/7372

* rethrow error instead of logging

* await .register

* Revert "rethrow error instead of logging"

This reverts commit 043162ba1f.

* improve comment

* remove JSRenderer

* add version-based cache invalidation

* refactor

* more refactor

* remove comment

* rename item to fit cache name

Co-authored-by: guillep2k <18600385+guillep2k@users.noreply.github.com>

* Switch code editor to Monaco

This switches out CodeMirror for Monaco which is based on the same code
base as VS code and should work pretty similar to it.

It does add a few async chunks, totalling around 10MB to our build. It
currently supports around 65 languages and in the default configuration,
each language would emit one ugly [number].js chunk, so I opted to
combine them all into a single file for now.

CodeMirror is still being used under the hood by SimpleMDE so it can not
be removed yet.

* inline editorconfig, fix diff, use for markdown, remove more dead code

* refactors, remove jquery usage

* use tab_width

* fix intellisense

* rename function for clarity

* misc tweaks, enable webpack progress display

* only use --progress on dev build

* remove useless borders in arc-green

* fix typo

* remove obsolete comment

* small refactor

* fix file creation and various refactors

* unset useTabStops too when no editorconfig

* small refactor

* disable webpack's [big] warnings

* remove useless await

* fix dark theme check

* rename chunk to 'monaco'

* add to .gitignore and delete webpack dest before build

* increase editor height

* support more editorconfig properties

* remove empty element filter

* rename

Co-authored-by: John Olheiser <john.olheiser@gmail.com>

* 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 (:smile:)
 * 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>

* Use AJAX for notifications table

Signed-off-by: Andrew Thornton <art27@cantab.net>

* move to separate js

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate golangci-lint

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add autoupdating notification count

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Fix wipeall

Signed-off-by: Andrew Thornton <art27@cantab.net>

* placate tests

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Try hidden

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Try hide and hidden

Signed-off-by: Andrew Thornton <art27@cantab.net>

* More auto-update improvements

Only run checker on pages that have a count
Change starting checker to 10s with a back-off to 60s if there is no change

Signed-off-by: Andrew Thornton <art27@cantab.net>

* string comparison!

Signed-off-by: Andrew Thornton <art27@cantab.net>

* as per @silverwind

Signed-off-by: Andrew Thornton <art27@cantab.net>

* add configurability as per @6543

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Add documentation as per @6543

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Use CSRF header not query

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Further JS improvements

Fix @etzelia update notification table request
Fix @silverwind comments

Co-Authored-By: silverwind <me@silverwind.io>
Signed-off-by: Andrew Thornton <art27@cantab.net>

* Simplify the notification count fns

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: silverwind <me@silverwind.io>

This should eliminate page freezes when loading big files/diff.
`highlightBlock` is needed to preserve existing nodes when highlighting
and for that, highlight.js needs access to the DOM API so I added a DOM
implementation to make it work, which adds around 300kB to the output
file size of the lazy-loaded `highlight.js`.

Co-authored-by: Lauris BH <lauris@nix.lv>

- lowercase all js filenames except Vue components
- enable new lint rules, mostly focused on shorter code
- autofix new lint violations
- apply misc transformations indexOf -> includes and onevent-> addEventListener

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

- reformated file with eslint's --fix
- did some minor rule adjustments
- removed unneccesary console debug
- fixed a typo

- unvendor vue and vue-calendar-heatmap
- remove unused moment.js leftover from previous heatmap version
- ensure webpack loads the full version of vue
- fix vue devmode warning related to 'searchLimit' type

I wanted to name the chunk heatmap.js but adblockers don't like that
filename [1].

[1] 3899d5dff3/easyprivacy/easyprivacy_general.txt (L2095)

* SVG fixes

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Colorize span->svg only

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* @silverwind suggestions

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Alphabetical

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Convert suburl and staticPrefix to window.config

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* De-structure

Signed-off-by: jolheiser <john.olheiser@gmail.com>

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

- created lazy-loaded webpack chunk for clipboard.js
- upgraded clipboard.js from 1.5.9 to 2.0.4
- parallelize initialization of all lazy-loaded features

Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

- move "vendor" files to js/vendor and less/vendor
- move swagger to js/standalone (meant for standalone pages)
- move gitgraph to features and streamline its loading
- add linting configs to webpack dependencies in make
- set ignored files for eslint/stylelint directly in their configs

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Antoine GIRARD <sapk@users.noreply.github.com>

- introduced window.config to help with js-based lazy-loading
- adjusted webpack chunk naming to avoid 'vendors~name.js' that webpack
  defaults to for vendor chunks.
- added theme class to html and prefixed all selectors. this is
  neccesary so that the theme styles win over the lazy-loaded ones.

Co-authored-by: zeripath <art27@cantab.net>

* move semantic.dropdown.custom.js to webpack

Also disabled a annoying linter rule which insisted that imports can not
contain a file extension.

Fixes: https://github.com/go-gitea/gitea/issues/8971

* reorganize web_src files and rebuild

* restart ci

- moved gitgraph.js to web_src and made it importable and es6-compatible
- created new webpack chunk for gitgraph
- enabled CSS loader in webpack
- enabled async/await syntax via regenerator-runtime
- added script to ensure webpack chunks are loaded correctly
- disable terser's comment extraction to prevent .LICENCE files

gitgraph.js has many issues:

1. it is incompatible with ES6 because of strict-mode violations
1. it does not export anything
1. it's css has weird styles like for `body`
1. it is not available on npm

I fixed points 1-3 in our version so it's now loadable in webpack. We should eventually consider alternatives.

* modernize js and use babel

- add babel toolchain to transform modern JS to ES5
- extend eslint config for modern rules
- fixes linting issues via `eslint --fix` and manual fixes

* run 'make css' to satisfy CI

* code style tweaks and set js indendation to 2 in .editorconfig

* regenerate js

* Move index.js to web_src and use webpack

* Fix initHeatMap

* update eslint and move webpack to devDependencies

* update index.js

* add eslint env node

Most of the work was done by `eslint --fix`, I fixed around 10 cases
where it could not auto-convert.

* add make targets for js,css, add javascript linter

- add `make js`, deprecating `make javascripts`
- add `make css`, deprecating `make generate-stylesheets` and
  `make stylesheets-check`
- changed the unclean css check to only run on CI
- add JS linting via eslint with basic configuration and fixed
  discovered issues
- changed autoprefixer to use official `postcss-cli` avoiding the need
  to loop in the makefile
- moved browserslist to package.json so other future tools can use it
  too.
- update documentation for new make targets and added JS section

* fix indentation

* move functions used in html to 'exported' list

* Run lessc binary without having to install anything to node_modules

* use relative paths to node bin scripts, removing npx

* Revert "use relative paths to node bin scripts, removing npx"

This reverts commit 119b725525.

* fix lessc and postcss plugins

* check for node_modules and use actual bin names