Following further testing it has become apparent that the diff line
cannot be used to determine filenames for diffs with any sort of predictability
the answer therefore is to use the other lines that are provided with a diff

Fix #12768

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

* Fix diff path unquoting

services/gitdiff/gitdiff.go whereby there it assumed that the path would
always be quoted on both sides

This PR simplifies the code here and uses fmt.Fscanf to parse the
strings as necessary.

Fix #12546

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

* Add testcase as per @mrsdizzie

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

Adding some more tests for different cases to make sure they keep working

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

Make previous fix from #12238 more robust since I saw a case where a diff changes only a single character in a chroma class instead of the entire thing. Add another more complicated test to match.

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

* Fix Syntax highlight for token change in added/deleted code

For diffs we first syntax highlight the before and after line then use a 3rd party diff library to find the difference in them and create a substring based on that, which we then highlight a 2nd time to show the specific difference within a line that has changed. In a specific case if the diffrence also changes the chroma class it will split in the middle of the attr and cause broken HTML:

```
<span class="nx">oldtext<span>
<span class="k">var newtext<span>
```

Will then split on

```
<span class="
```

Where the difference starts, and produce something broken like:

```
<span class="<span class="removed-code">nx"oldtext</span></span

```

Fix that by detecting when it happens and putting the HTML back together properly before highlighting the added/deleted code.

Fixes #12235

* fix lint

* apply fix to all diff sections. Also handle case where insert/remove starts with a closing span

* Add a test for this new code

* remove comment

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>

* Some refactor on git diff and ignore getting commit information failed on migrating pull request review comments

* fix test

* fix lint

* Change error log to warn

* fix typo

* Migrate reviews when migrating repository from github

* fix lint

* Added test and migration when external user login

* fix test

* fix commented state

* Some improvements

* fix bug when get pull request and ref original author on code comments

* Fix migrated line; Added comment for review

* Don't load all pull requests attributes

* Fix typo

* wrong change copy head

* fix tests

* fix reactions

* Fix test

* fix fmt

* fix review comment reactions

* fix panic when diff

* improve code

* move git diff codes from models to services/gitdiff

* fix template

* fix test

* fix template

* Make diff line-marker non-selectable
* Move to use data-* as per @mrsdizzie
* fix missing line nums
* Add a minimum-width to force right-align of the line num
* Move line-type-marker into separate column

* Fix ParsePatch to work properly with quoted diff --git string

Currently ParsePatch fails when a diff contains a quoted diff line like:

diff --git "a/file" "b/file"

This patch makes it properly parse the line when that happens.

Fixes #6309

* Add test for regular case while here

* Simplify string modification

* Initial ui components for pull request review

* Add Review
Add IssueComment types

Signed-off-by: Jonas Franz <info@jonasfranz.software>

(cherry picked from commit 2b4daab)
Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Replace ReviewComment with Content

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add load functions
Add ReviewID to findComments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add create review comment implementation
Add migration for review
Other small changes

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Simplified create and find functions for review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Moved "Pending" to first position

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add GetCurrentReview to simplify fetching current review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Preview for listing comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Move new comment form to its own file

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Implement Review form
Show Review comments on comment stream

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for single comments
Showing buttons in context

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add pending tag to pending review comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add unit tests for Review

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fetch all review ids at once
Add unit tests

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Improved comment rendering in "Files" view by adding Comments to DiffLine

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for invalidating comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Switched back to code.gitea.io/git

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Moved review migration from v64 to v65

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Rebuild css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Improve translations

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix unit tests by updating fixtures and updating outdated test

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Comments will be shown at the right place now

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for deleting CodeComments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix problems caused by files in subdirectories

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for showing code comments of reviews in conversation

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for "Show/Hide outdated"

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update code.gitea.io/git

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add support for new webhooks

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update comparison

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Resolve conflicts

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Minor UI improvements

* update code.gitea.io/git

* Fix ui bug reported by @lunny causing wrong position of add button
Add functionality to "Cancel" button
Add scale effects to add button
Hide "Cancel" button for existing comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Prepare solving conflicts

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Show add button only if no comments already exist for the line

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add missing vendor files

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Check if reviewer is nil

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Show forms only to users who are logged in

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Revert "Show forms only to users who are logged in"

This reverts commit c083682

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Save patch in comment
Render patch for code comments

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add link to comment in code

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add reply form to comment list
Show forms only to signed in users

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add 'Reply' as translatable
Add CODE_COMMENT_LINES setting

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* gofmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix problems introduced by checking for singed in user

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add v70

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update generated stylesheet

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix preview
Beginn with new review comment patch system

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add new algo to generate diff for line range
Remove old algo used for cutting big diffs (it was very buggy)

* Add documentation and example for CutDiffAroundLine

* Fix example of CutDiffAroundLine

* Fix some comment UI rendering bugs

* Add code comment edit mode

* Send notifications / actions to users until review gets published
Fix diff generation bug
Fix wrong hashtag

* Fix vet errors

* Send notifications also for single comments

* Fix some notification bugs, fix link

* Fix: add comment icon is only shown on code lines

* Add lint comment

* Add unit tests for git diff

* Add more error messages

* Regenerated css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* fmt

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Regenerated CSS with latest less version

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix test by updating comment type to new ID

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Introducing CodeComments as type for map[string]map[int64][]*Comment
Other minor code improvements

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Fix data-tab issues

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Remove unnecessary change

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* refactored checkForInvalidation

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Append comments instead of setting

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Use HeadRepo instead of BaseRepo

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update migration

Signed-off-by: Jonas Franz <info@jonasfranz.de>

* Regenerated CSS

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Add copyright

Signed-off-by: Jonas Franz <info@jonasfranz.software>

* Update index.css

Signed-off-by: Jonas Franz <info@jonasfranz.software>

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

- Try to reduce memory allocations
- Add possibility to disable diff highlight (can improve performance for large diffs)
- Tweaking with cost for prettier (cleaner) diffs
- Do not calculate diff when the number of removed lines in a block is not equal to the number of added lines (this usually resulted in ugly diffs)