Webpack < 5.59 has a bug, which makes watch-frontend fail when editing .less files.

* Update JS dependencies

- Upgrade to eslint 8 and add new plugin rules
- Adapt to various API changes
- Rebuild SVGs

* fix webpack warning on license

* order options alphabetically

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

* Update JS dependencies

- Update all JS dependencies
- Adapt to recent webpack changes
- Add new lint rules and fix issues
- Regenerate SVGs and update svgo api usage

Fixes: https://github.com/go-gitea/gitea/pull/16492

* adapt jest config and sort keys

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

Use async clipboard api [1] over this dependency, saving around 10kB
bundle size before minify while delivering the same functionality.

The issue comment button works but does not have a popup indication. We
could add some toast-style notifications in the future to fix that but I
think it's out of scope of this PR.

[1] https://developer.mozilla.org/en-US/docs/Web/API/Clipboard/writeText

- Update all JS dependencies to latest version
- Use Node 16 on CI
- Add new lint rules
- Add some gitignore entries for debug files

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

It's about a 30% speedup in webpack build time with neglible differences
in the output size. We do lose the ability for CSS source maps, but I
rarely have a use for them anyways.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>

* Update JS dependencies

- Update all JS dependencies
- Regenerate SVGs
- Remove unused postcss dependency
- Remove removed webpack option

* re-add postcss

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

* Enforce tab indendation in templates

This adds editorconfig-checker [1] to lint the template files so they
conform the editorconfig files. I fixed all current identation issues
using the fix mode of eclint [2] and some manual corrections.

We can extend this linting to other files later, for now I'd like this
PR to focus on HTML template files only.

[1] https://github.com/editorconfig-checker/editorconfig-checker
[2] https://github.com/jedmao/eclint

* fix indendation

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

- 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.

- Update all JS dependencies to latest version, no functional changes.
- Remove unused direct dependencies core-js and terser-webpack-plugin.

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: 6543 <6543@obermui.de>

* Vendor node mods as cache; fix esbuild/fomantic offline build

* Fix --exclude; use bsdtar for consistent globbing

* Fall back to GNU tar; forward-compatible for APT 2.0

* Avoid having extd. attrs with bsdtar

* Dependency and misc. optimizations

* Remove extra code after esbuild-loader update

Co-authored-by: Mike L <cl.jeremy@qq.com>

- Upgrade webpack to 5.28 to enable publicPath option
- Use asset modules in place of deprecated file-loader

Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

Webpack now includes this functionality, allowing us to drop this
now-deprecated dependency.

Ref: https://webpack.js.org/guides/asset-modules/
Ref: https://webpack.js.org/loaders/raw-loader/

* 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

This patch resolves #14520

* add notification about running stopwatch to header

* serialize seconds, duration in stopwatches api

* ajax update stopwatch

i should get my testenv working locally...

* new variant: hover dialog

* noscript compatibility

* js: live-update stopwatch time

* js live update robustness

* 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>

* Swap swagger-ui with swagger-ui-dist

The prebuilt version of swagger-ui is identical to the regular one but
brings the benefit of faster webpack compilation and less npm
dependencies so it npm installs will speed up too.

* use bundle file directly

Turns out some of the dependencies make use of optional dependencies
like the vue-template-compiler. Install them again and install
fomantic-ui only when it's being build to fix webpack warnings.

* 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>

* Switch from SimpleMDE to EasyMDE

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

* use webpack to webpack the easymde css

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

* move css to only css

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

* move loading codemirror modes and addons back in to footer.tmpl

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

* Fix arc-green

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

* as per @silverwind

* reinstall codemirror

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

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

- Update all JS dependencies minus Webpack
- Add postcss again to avoid warnings about missing peerDependencies

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

* 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>

* Use CSS Variables for fonts, remove postcss-loader

- Use CSS variables for fonts, making the fonts easier to customize
- Remove postcss-loader, it's not doing anything useful and is actually
  applying strange transforms on our CSS.

Fixes: https://github.com/go-gitea/gitea/issues/11045

* introduce helper variable, mark documented vars

* work around case issue by always quoting specific fonts

- Update all dependencies
- Add explicit postcss dependency as dictated by postcss-loader
- Adapt for new postcss-loader syntax
- Move sourceMap options to top for consistency

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

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

- Emit static string for licenses.txt during development for faster builds
- Manually add @primer/octicons to licenses.txt because it's never
  directy imported.

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

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: jaqra <48099350+jaqra@users.noreply.github.com>
Co-authored-by: Kerry <flatline-studios@users.noreply.github.com>
Co-authored-by: Jaqra <jaqra@hotmail.com>
Co-authored-by: Kyle Evans <kevans91@users.noreply.github.com>
Co-authored-by: Tsakiridis Ilias <TsakiDev@users.noreply.github.com>
Co-authored-by: Ilias Tsakiridis <ilias.tsakiridis@outlook.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

* Update JS dependencies

- Update worker-loader options (currently unused pending #12459)
- Remove @babel/plugin-proposal-object-rest-spread, it's enabled by
  default
- Switch cssnano-webpack-plugin to css-minimizer-webpack-plugin which
  had been renamed

* switch to css-minimizer-webpack-plugin

The previous method did not escape single quotes which under some
circumstances can lead to XSS vulnerabilites and the fact that it
depends on jQuery is also not ideal. Replace it with a lightweight
module.

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

* Move jquery-minicolors to npm/webpack

- Unvendor and add as npm dependency
- Removed unneeded backend variable
- Fixed existing bug where picker would previously initizalize to the
  same green color when editing a label.

There was probably a version bump because the previous version was
over 3 years old but it seems to be compatible.

* use file-loader

* trailing comma and comment update

* misc tweaks

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

- 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>

* Add mermaid JS renderer

For feature parity with GitLab. Tested in files, issues, wiki, editor.
arc-green only does an inversion because the renderer seems to like to
render white backgrounds on boxes.

Ref: https://github.com/go-gitea/gitea/issues/3340
Fixes: https://github.com/go-gitea/gitea/issues/12307

* add feature entry, switch to neutral theme, remove border

* add bindFunctions support

* remove unnecessary border-radius

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

* Update Octicons to v10

Besides a few renames, these icons are no longer present in v10 that we've
used, so had to change:

file-symlink-directory -> file-submodule
internal-repo -> repo
repo-force-push -> repo-push
repo-template-private -> repo-template

Fixes: https://github.com/go-gitea/gitea/issues/11889
Ref: https://github.com/primer/octicons/releases/tag/v10.0.0

* add custom sliders svg for removed octicon-settings

* apply suggestion

* fix triangles and use play on admin dashboard

* add custom mirror svg

* add missing build files

* unify custom svgs

* move to octicon-repo-clone to gitea-mirror

* use octicon-x on conflicts

* tweak timeline icons

* tweak comment buttons

* update settings icon to octicons v1

* switch to octicon-mirror and octicon-tools

* replace two wiki buttons with octicons

* remove whitespace in svg sources

* Fix filepath basename on Windows for SVG bindata (#12241)

* move octicons to devDependencies

* move back to dependencies

* move svgo to devDependencies again

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

Introduce 'make svg' which calls a node script that compiles svg files
to `public/img/svg`. These files are vendored to not create a dependency
on Node for the backend build.

On the frontend side, configure webpack using `raw-loader` so SVGs can
be imported as string.

Also moved our existing SVGs to web_src/svg for consistency.

Fixes: https://github.com/go-gitea/gitea/issues/11618

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

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

- Use system fonts only for text to avoid FOUT
- Move font-awesome to npm/webpack
- Move NotoColorEmoji to web_src
- Remove presumably unneccesary 'PT Sans Narrow'
- Simplify webpack import exclusions

Fixes: https://github.com/go-gitea/gitea/issues/11818
Fixes: https://github.com/go-gitea/gitea/pull/11814

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

This saves around 3 MB binary size by not including useless fomantic
files in the build. Also, this allows us to move jQuery into the main
bundle as well which eliminates a few HTTP requests.

Also included are webpack config changes:

- split less and css loaders to speed up compliation
- enable css sourcemaps
- switch css minfier plugin to cssnano-webpack-plugin which works better
  for sourcemaps than the previous plugin

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

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

* Add automatic JS license generation

Removed librejs file and replaced it with a plaintext file that is built
from all JS dependencies that are included in the webpack build. It does
not cover the few remaining statically vendored files and fomantic is
added manually because it's not yet in the webpack build process.

Fixes: https://github.com/go-gitea/gitea/issues/11630

* fix lint

* remove jslicense, we're not librejs compatible any more

* remove license.txt test as it depens on absent files

* small optimization

* trailing comma

* localize and capitalize the word 'licenses'

* reduce text to just 'Licenses'

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

Result of `make npm-update`, no noteworthy changes.

This removes the jQuery plugin as well as the associated config options.
Native input[type=date] does not require a language attribute as it is
localized by default, except for the placeholder attribute for which I
currently piggy-back the repo.issues.due_date_form localization option.

Implementation should pretty much match GH. Of note is that Safari does
not provide a UI for this input type, but I don't think providing one is
neccessary and GH did not bother either.

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>

Update to [2.8.5](https://github.com/fomantic/Fomantic-UI/releases/tag/2.8.5)
and remove the workaround for the CSS build race condition.

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

* 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>

* Move tributejs to npm/webpack

- Move vendored bundle to npm and webpack
- Rewrote initialization to single function
- Restyled it (made it a bit smaller)
- Fixed it for arc-green

* fix mention

* also include emoji on #content

* Update web_src/less/_tribute.less

Co-authored-by: mrsdizzie <info@mrsdizzie.com>

* rewrite to only use one instance of Tribute

* refactor

* fix copy/paste error

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

* Remove IE11 support

With master now on 1.13, it's time to drop IE11 for good. The woff
variants are also in use by Opera Mini but it has even less market share
and I can only imagine how broken the UI is in it.

Fixes: https://github.com/go-gitea/gitea/issues/6147

* update docs

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