So I found this [linter](https://github.com/Riverside-Healthcare/djlint)
which features a mode for go templates, so I gave it a try and it did
find a number of valid issue, like unbalanced tags etc. It also has a
number of bugs, I had to disable/workaround many issues.
Given that this linter is written in python, this does add a dependency
on `python` >= 3.8 and `poetry` to the development environment to be
able to run this linter locally.
- `e.g.` prefixes on placeholders are removed because the linter had a
false-positive on `placeholder="e.g. cn=Search"` for the `attr=value`
syntax and it's not ideal anyways to write `e.g.` into a placeholder
because a placeholder is meant to hold a sample value.
- In `templates/repo/settings/options.tmpl` I simplified the logic to
not conditionally create opening tags without closing tags because this
stuff confuses the linter (and possibly the reader as well).
Feel free to close this if there isn't interest.
The tree view looks amazing, and all of our users are really enjoying it
(major kudos to developers!), but only IF I tell them it exists!
Essentially, the file tree view as it is effectively undiscoverable.
This PR changes the default state for the tree view to open, which
should significantly help with discoverability.
An alternative could be to reserve more horizontal space, as a typical
accordion panel would look (eg. VS Code), eg.
There was some recent discussion about this in Discord `ui-design`
channel and the conclusion was that
https://github.com/go-gitea/gitea/issues/24305 should have fixed their
OS font installation to have semibold weights.
I have now tested this 601 weight on a Windows 10 machine on Firefox
myself, and I immediately noticed that bold was excessivly bold and
rendering as 700 because browsers are biased towards bolder fonts. So
revert this back to the previous value.
Visually, nothing should have changed.
Changes include
- Convert most `<a [no href]>` to `<button>` when (re-)viewing files:
- `<a [no href]>` are, by HTML definition, not a link and hence cannot
be focused
- `<a class="ui button">` can now be clicked (again?) using
<kbd>Enter</kbd>
- Previously, the installed keypress handler on `.ui.button` elements
disabled it for links somehow
- The `(un)escape file`, the `expand section` and the `expand/collapse
file` buttons can now be focused (and subsequently clicked using only
the keyboard)
- You can now press <kbd>Space</kbd> on a focused `View file` checkbox
to mark the file as viewed.
- previously, this was impossible as this checkbox listened on the wrong
event listener
The `add code comment` button has been left inaccessible for now as it
requires quite a bit of extra logic so that it is unhidden when it is
focused (you can otherwise focus it without seeing it as you are not
hovering on the corresponding line).
---------
Co-authored-by: silverwind <me@silverwind.io>
I am not sure what "new-menu" means, but I think we need to fix these
problems:
1. it shouldn't have "stackable", which makes the items stacked when
width is small. the `new-menu` already has `overflow: auto`
2. `justify-content: center` doesn't work with `overflow: auto` (for
small width), so use `margin: auto`
*
https://bhch.github.io/posts/2021/04/centring-flex-items-and-allowing-overflow-scroll/
3. `runner-new-menu` is dead code (copying & pasting ?)
Close#24195
Some of the changes are taken from my another fix
f07b0de997
in #20147 (although that PR was discarded ....)
The bug is:
1. The old code doesn't handle `removedfile` event correctly
2. The old code doesn't provide attachments for type=CommentTypeReview
This PR doesn't intend to refactor the "upload" code to a perfect state
(to avoid making the review difficult), so some legacy styles are kept.
---------
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: Giteabot <teabot@gitea.io>
One of the steps in #23328
Before there were 3 different but similar functions: dict/Dict/mergeinto
The code was just copied & pasted, no test.
This PR defines a new stable `dict` function, it covers all the 3 old
functions behaviors, only +160 -171
Future developers do not need to think about or guess the different dict
functions, just use one: `dict`
Why use `dict` but not `Dict`? Because there are far more `dict` than
`Dict` in code already ......
One of the proposals in #23328
This PR introduces a simple expression calculator
(templates/eval/eval.go), it can do basic expression calculations.
Many untested template helper functions like `Mul` `Add` can be replaced
by this new approach.
Then these `Add` / `Mul` / `percentage` / `Subtract` / `DiffStatsWidth`
could all use this `Eval`.
And it provides enhancements for Golang templates, and improves
readability.
Some examples:
----
* Before: `{{Add (Mul $glyph.Row 12) 12}}`
* After: `{{Eval $glyph.Row "*" 12 "+" 12}}`
----
* Before: `{{if lt (Add $i 1) (len $.Topics)}}`
* After: `{{if Eval $i "+" 1 "<" (len $.Topics)}}`
## FAQ
### Why not use an existing expression package?
We need a highly customized expression engine:
* do the calculation on the fly, without pre-compiling
* deal with int/int64/float64 types, to make the result could be used in
Golang template.
* make the syntax could be used in the Golang template directly
* do not introduce too much complex or strange syntax, we just need a
simple calculator.
* it needs to strictly follow Golang template's behavior, for example,
Golang template treats all non-zero values as truth, but many 3rd
packages don't do so.
### What's the benefit?
* Developers don't need to add more `Add`/`Mul`/`Sub`-like functions,
they were getting more and more.
Now, only one `Eval` is enough for all cases.
* The new code reads better than old `{{Add (Mul $glyph.Row 12) 12}}`,
the old one isn't familiar to most procedural programming developers
(eg, the Golang expression syntax).
* The `Eval` is fully covered by tests, many old `Add`/`Mul`-like
functions were never tested.
### The performance?
It doesn't use `reflect`, it doesn't need to parse or compile when used
in Golang template, the performance is as fast as native Go template.
### Is it too complex? Could it be unstable?
The expression calculator program is a common homework for computer
science students, and it's widely used as a teaching and practicing
purpose for developers. The algorithm is pretty well-known.
The behavior can be clearly defined, it is stable.
Some of those are still Copy&Paste problems.
This PR:
* Only cleans the legacy incorrect code, doesn't change or improve the
"action" logic.
* Remove the redundant `$('.toggle.button').on('click')`, now
`$('.show-panel.button').on('click')` handles that kinds of buttons
Actually, there is only one correct "toggle button" in code, the one on
the webhook page.
No need to backport.
Follow:
* #23574
* Remove all ".tooltip[data-content=...]"
Major changes:
* Remove "tooltip" class, use "[data-tooltip-content=...]" instead of
".tooltip[data-content=...]"
* Remove legacy `data-position`, it's dead code since last Fomantic
Tooltip -> Tippy Tooltip refactoring
* Rename reaction attribute from `data-content` to
`data-reaction-content`
* Add comments for some `data-content`: `{{/* used by the form */}}`
* Remove empty "ui" class
* Use "text color" for SVG icons (a few)
Remove `[repository.editor] PREVIEWABLE_FILE_MODES` setting that seemed
like it was intended to support this but did not work. Instead, whenever
viewing a file shows a preview, also have a Preview tab in the file
editor.
Add new `/markup` web and API endpoints with `comment`, `gfm`,
`markdown` and new `file` mode that uses a file path to determine the
renderer.
Remove `/markdown` web endpoint but keep the API for backwards and
GitHub compatibility.
## ⚠️ BREAKING ⚠️
The `[repository.editor] PREVIEWABLE_FILE_MODES` setting was removed.
This setting served no practical purpose and was not working correctly.
Instead a preview tab is always shown in the file editor when supported.
---------
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
This improves a lot of accessibility shortcomings.
Every possible instance of `<div class="button">` matching the command
`ag '<[^ab].*?class=.*?[" ]button[ "]' templates/ | grep -v 'dropdown'`
has been converted when possible.
divs with the `dropdown` class and their children were omitted as
1. more analysis must be conducted whether the dropdowns still work as
intended when they are a `button` instead of a `div`.
2. most dropdowns have `div`s as children. The HTML standard disallows
`div`s inside `button`s.
3. When a dropdown child that's part of the displayed text content is
converted to a `button`, the dropdown can be focused twice
Further changes include that all "gitea-managed" buttons with JS code
received an `e.preventDefault()` so that they don't accidentally submit
an underlying form, which would execute instead of cancel the action.
Lastly, some minor issues were fixed as well during the refactoring.
## Future improvements
As mentioned in
https://github.com/go-gitea/gitea/pull/23337#discussion_r1127277391,
`<a>`s without `href` attribute are not focusable.
They should later on be converted to `<button>`s.
---------
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Close#23241
Before: press Ctrl+Enter in the Code Review Form, a single comment will
be added.
After: press Ctrl+Enter in the Code Review Form, start the review with
pending comments.
The old name `is_review` is not clear, so the new code use
`pending_review` as the new name.
Co-authored-by: delvh <leon@kske.dev>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Before, the `dict "ctx" ...` map is used to pass data between templates.
Now, more and more templates need to use real Go context:
* #22962
* #23092
`ctx` is a Go concept for `Context`, misusing it may cause problems, and
it makes it difficult to review or refactor.
This PR contains 2 major changes:
* In the top scope of a template, the `$` is the same as the `.`, so the
old labels_sidebar's `root` is the `ctx`. So this `ctx` could just be
removed.
bd7f218dce
* Rename all other `ctx` to `ctxData`, and it perfectly matches how it
comes from backend: `"ctxData": ctx.Data`.
7c01260e1d
From now on, there is no `ctx` in templates. There are only:
* `ctxData` for passing data
* `Context` for Go context
Close#22847
This PR:
* introduce Gitea's own `showElem` and related functions
* remove jQuery show/hide
* remove .hide class
* remove inline style=display:none
From now on:
do not use:
* "[hidden]" attribute: it's too weak, can not be applied to an element
with "display: flex"
* ".hidden" class: it has been polluted by Fomantic UI in many cases
* inline style="display: none": it's difficult to tweak
* jQuery's show/hide/toggle: it can not show/hide elements with
"display: xxx !important"
only use:
* this ".gt-hidden" class
* showElem/hideElem/toggleElem functions in "utils/dom.js"
cc: @silverwind , this is the all-in-one PR
This is an alternative solution to #22824
and would also close#22781
This makes the PR diff view always full width.
It makes sense to make use of that screen real estate. If you want a
more narrow view you can always resize your browser.
It also avoids cluttering the UI with another button + the database with
another column for the setting.
This is also how github and gitlab do it.
To avoid duplicated load of the same data in an HTTP request, we can set
a context cache to do that. i.e. Some pages may load a user from a
database with the same id in different areas on the same page. But the
code is hidden in two different deep logic. How should we share the
user? As a result of this PR, now if both entry functions accept
`context.Context` as the first parameter and we just need to refactor
`GetUserByID` to reuse the user from the context cache. Then it will not
be loaded twice on an HTTP request.
But of course, sometimes we would like to reload an object from the
database, that's why `RemoveContextData` is also exposed.
The core context cache is here. It defines a new context
```go
type cacheContext struct {
ctx context.Context
data map[any]map[any]any
lock sync.RWMutex
}
var cacheContextKey = struct{}{}
func WithCacheContext(ctx context.Context) context.Context {
return context.WithValue(ctx, cacheContextKey, &cacheContext{
ctx: ctx,
data: make(map[any]map[any]any),
})
}
```
Then you can use the below 4 methods to read/write/del the data within
the same context.
```go
func GetContextData(ctx context.Context, tp, key any) any
func SetContextData(ctx context.Context, tp, key, value any)
func RemoveContextData(ctx context.Context, tp, key any)
func GetWithContextCache[T any](ctx context.Context, cacheGroupKey string, cacheTargetID any, f func() (T, error)) (T, error)
```
Then let's take a look at how `system.GetString` implement it.
```go
func GetSetting(ctx context.Context, key string) (string, error) {
return cache.GetWithContextCache(ctx, contextCacheKey, key, func() (string, error) {
return cache.GetString(genSettingCacheKey(key), func() (string, error) {
res, err := GetSettingNoCache(ctx, key)
if err != nil {
return "", err
}
return res.SettingValue, nil
})
})
}
```
First, it will check if context data include the setting object with the
key. If not, it will query from the global cache which may be memory or
a Redis cache. If not, it will get the object from the database. In the
end, if the object gets from the global cache or database, it will be
set into the context cache.
An object stored in the context cache will only be destroyed after the
context disappeared.
As discussed in #22847 the helpers in helpers.less need to have a
separate prefix as they are causing conflicts with fomantic styles
This will allow us to have the `.gt-hidden { display:none !important; }`
style that is needed to for the reverted PR.
Of note in doing this I have noticed that there was already a conflict
with at least one chroma style which this PR now avoids.
I've also added in the `gt-hidden` style that matches the tailwind one
and switched the code that needed it to use that.
Signed-off-by: Andrew Thornton <art27@cantab.net>
---------
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
partially fix#19345
This PR add some `Link` methods for different objects. The `Link`
methods are not different from `HTMLURL`, they are lack of the absolute
URL. And most of UI `HTMLURL` have been replaced to `Link` so that users
can visit them from a different domain or IP.
This PR also introduces a new javascript configuration
`window.config.reqAppUrl` which is different from `appUrl` which is
still an absolute url but the domain has been replaced to the current
requested domain.
There was a serious regression in #21012 which broke the Show More
button on the diff page, and the show more button was also broken on the
file tree too.
This PR fixes this by resetting the pageData.diffFiles as the vue
watched value and reattachs a function to the show more button outside
of the file tree view.
Fix#22380
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: John Olheiser <john.olheiser@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
- Fix placement of avatar image, this was not placed in the
`comment-header-left` and add CSS to cover the limiting of width+height
of avatar for code-review comment on "Files changed" page. This fixes
the big noticeable avatar issue.
- Apply `margin-bottom` to the "next" button, so it's consistent with
the "previous" button.
- Make sure the "next"/"previous" start at `flex-start` on mobile and
not off-screen at `flex-end`. As well force them to have `flex: 1` so
they won't overflow on x-asis. This also requires the `width: 100%` for
the `.ui.buttons` div.
- Resolves#20074
### Before
<details><img width="512"
src="https://user-images.githubusercontent.com/25481501/195952930-09560cad-419f-43a3-a8a4-a4166c117994.jpg"></details>
### After
<details><img width="512"
src="https://user-images.githubusercontent.com/25481501/197340081-0365dfa8-4344-46b4-8702-a40c778c073f.jpg"></details>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
This PR adds a filetree to the left side of the files/diff view.
Initially the filetree will not be shown and may be shown via a new
"Show file tree" button.
Showing and hiding is using the same icon as github. Folders are
collapsible. On small devices (max-width 991 PX) the file tree will be
hidden.
Close#18192
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
The problem was that many PR review components loaded by `Show more`
received the same ID as previous batches, which confuses browsers (when
clicked). All such occurrences should now be fixed.
Additionally improved the background of the `viewed` checkbox.
Lastly, the `go-licenses.json` was automatically updated.
Fixes#21228.
Fixes#20681.
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Fixes#21184
Regression of #19552
Instead of using `GetBlobByPath` I use the already existing instances.
We need more information from #19530 if that error is still present.
There are several places in templates/repo/issue/view_content/comments.tmpl where links are made to Posters or Assignees who are Ghosts or have IDs <0.
Fix#20559
Signed-off-by: Andrew Thornton <art27@cantab.net>
If there is only one "Add comment" button (when there are pending review comments), the quick-submit should submit the form with is_review=true even if the "Add comment" button is not really clicked.
Close #20990
* feat: extend issue template for yaml
* feat: support yaml template
* feat: render form to markdown
* feat: support yaml template for pr
* chore: rename to Fields
* feat: template unmarshal
* feat: split template
* feat: render to markdown
* feat: use full name as template file name
* chore: remove useless file
* feat: use dropdown of fomantic ui
* feat: update input style
* docs: more comments
* fix: render text without render
* chore: fix lint error
* fix: support use description as about in markdown
* fix: add field class in form
* chore: generate swagger
* feat: validate template
* feat: support is_nummber and regex
* test: fix broken unit tests
* fix: ignore empty body of md template
* fix: make multiple easymde editors work in one page
* feat: better UI
* fix: js error in pr form
* chore: generate swagger
* feat: support regex validation
* chore: generate swagger
* fix: refresh each markdown editor
* chore: give up required validation
* fix: correct issue template candidates
* fix: correct checkboxes style
* chore: ignore .hugo_build.lock in docs
* docs: separate out a new doc for merge templates
* docs: introduce syntax of yaml template
* feat: show a alert for invalid templates
* test: add case for a valid template
* fix: correct attributes of required checkbox
* fix: add class not-under-easymde for dropzone
* fix: use more back-quotes
* chore: remove translation in zh-CN
* fix EasyMDE statusbar margin
* fix: remove repeated blocks
* fix: reuse regex for quotes
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
The layout on the review code view was broken depending on length of the text. Change all three buttons to icons with tooltip to make more space for these long texts.
Fixes: #20922
Gitea used to return 500 on the /:user/:repo/:commit route due to locale
being undefined in the escape_title template.
Co-authored-by: bad <badatnames@tutanota.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: zeripath <art27@cantab.net>
This PR rewrites the invisible unicode detection algorithm to more
closely match that of the Monaco editor on the system. It provides a
technique for detecting ambiguous characters and relaxes the detection
of combining marks.
Control characters are in addition detected as invisible in this
implementation whereas they are not on monaco but this is related to
font issues.
Close#19913
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Refactor `i18n` to `locale`
- Currently we're using the `i18n` variable naming for the `locale`
struct. This contains locale's specific information and cannot be used
for general i18n purpose, therefore refactoring it to `locale` makes
more sense.
- Ref: https://github.com/go-gitea/gitea/pull/20096#discussion_r906699200
* Update routers/install/install.go
* Prototyping
* Start work on creating offsets
* Modify tests
* Start prototyping with actual MPH
* Twiddle around
* Twiddle around comments
* Convert templates
* Fix external languages
* Fix latest translation
* Fix some test
* Tidy up code
* Use simple map
* go mod tidy
* Move back to data structure
- Uses less memory by creating for each language a map.
* Apply suggestions from code review
Co-authored-by: delvh <dev.lh@web.de>
* Add some comments
* Fix tests
* Try to fix tests
* Use en-US as defacto fallback
* Use correct slices
* refactor (#4)
* Remove TryTr, add log for missing translation key
* Refactor i18n
- Separate dev and production locale stores.
- Allow for live-reloading in dev mode.
Co-authored-by: zeripath <art27@cantab.net>
* Fix live-reloading & check for errors
* Make linter happy
* live-reload with periodic check (#5)
* Fix tests
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: zeripath <art27@cantab.net>
Replace the only `<meter>` element in use with a `<progress>` which is
styled properly. Also slightly adjust colors on it for better contrast.
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
* Make Ctrl+Enter (quick submit) work for issue comment and wiki editor
* Remove the required `SubmitReviewForm.Type`, empty type (triggered by quick submit) means "comment"
* Merge duplicate code
* make blue really blue
* replace blue button and label classes with primary
* add --color-blue-dark
* add light color variants, tweak a few colors
* fix colors
* add comment
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
* remove unnecessary web context data fields, and unify the i18n/translation related functions to `Locale`
* in development, show an error if a translation key is missing
* remove the unnecessary loops `for _, lang := range translation.AllLangs()` for every request, which improves the performance slightly
* use `ctx.Locale.Language()` instead of `ctx.Data["Lang"].(string)`
* add more comments about how the Locale/LangType fields are used
It appears that the blob-excerpt links do not work on the wiki - likely since their
introduction.
This PR adds support for the wiki on these links.
Signed-off-by: Andrew Thornton <art27@cantab.net>
Currently the "File Changed" tab of a PR is somehow broken. This is also true for the current release 1.16.0.
When you are on the "File Changed" tab, and want to look at code excerpt before or after the code changes, the layout breaks. You can test this on try.gitea.io here: https://try.gitea.io/testnotexisting/magic_enum/pulls/2/files
The problem occurs for the unified view and for the split view.
Kind of the same problem was there for commenting a line of code, this was fixed in #18321 and #18403.
For consistency, I changed the solution of #18321, I removed the ``colspan`` and instead added a ``<td>``. The goal was to have code similarly with the split view.
Also the separator line in the split view was in the wrong column, this was fixed too.* more consistent unified review comment
Fix#18516
Co-authored-by: Andrew Thornton <art27@cantab.net>
* Remove accidental debugging in blob_excerpt.tmpl
Unfortunately it appears that a small bit of debugging code was left in blob_excerpt.tmpl
This breaks diff expansion causing #18281.
Fix#18281
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Fix#17514
Given the comments I've adjusted this somewhat. The numbers of characters detected are increased and include things like the use of U+300 to make à instead of à and non-breaking spaces.
There is a button which can be used to escape the content to show it.
Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Gwyneth Morgan <gwymor@tilde.club>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
* Allow Loading of Diffs that are too large
This PR allows the loading of diffs that are suppressed because the file
is too large. It does not handle diffs of files which have lines which
are too long.
Fix#17738
Signed-off-by: Andrew Thornton <art27@cantab.net>
Refactor repo-legacy.js, remove messy global variables. Fix errors.
Fix an error in Sortable
Fix a incorrect call assignMenuAttributes from the template
* Cleanup and use global style on popups
- Fix typo 'poping' to 'popping'
- Remove most inline 'data-variation' attributes
- Initialize all popups with 'inverted tiny' variation
* misc tweaks
* rename to .tooltip, use jQuery
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
There are multiple places where Gitea does not properly escape URLs that it is building and there are multiple places where it builds urls when there is already a simpler function available to use this.
This is an extensive PR attempting to fix these issues.
1. The first commit in this PR looks through all href, src and links in the Gitea codebase and has attempted to catch all the places where there is potentially incomplete escaping.
2. Whilst doing this we will prefer to use functions that create URLs over recreating them by hand.
3. All uses of strings should be directly escaped - even if they are not currently expected to contain escaping characters. The main benefit to doing this will be that we can consider relaxing the constraints on user names and reponames in future.
4. The next commit looks at escaping in the wiki and re-considers the urls that are used there. Using the improved escaping here wiki files containing '/'. (This implementation will currently still place all of the wiki files the root directory of the repo but this would not be difficult to change.)
5. The title generation in feeds is now properly escaped.
6. EscapePound is no longer needed - urls should be PathEscaped / QueryEscaped as necessary but then re-escaped with Escape when creating html with locales Signed-off-by: Andrew Thornton <art27@cantab.net>
Signed-off-by: Andrew Thornton <art27@cantab.net>
* Remove swipe-bar z-index
Fixes position of swipe-bar so it does not overlay other UI components when scrolling.
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
* Unique names for image tabs in pull request
Define unique names for image tabs in pull requests, in order to toggle tabs correctly when multiple are displayed on one page.
Signed-off-by: Mario Lubenka <mario.lubenka@googlemail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Fixes#16837 if a column is deleted.
We were clobbering the columns that were added by looping through the aline (base) and then when bline (head) was looped through, it clobbered what was in the "cells" array that is show in the diff, and then left a nil cell because nothing was shifted.
This fix properly shifts the cells, and properly puts the b cell either at its location or after, according to what the aline placed in the cells.
This includes test, adding a new test function since adding/removing cells works best with three columns, not two, which results in 4 columns of the resulting cells because it has a deleted column and an added column. If you try this locally, you can try those cases and others, such as adding a column.
There was no need to do anything special for the rows when `aline == 0 || bline == 0` so that was removed. This allows the same code to be used for removed or added lines, with the bcell text always being the RightCell, acell text being the LeftCell.
I still added the patch zeripath gave at https://github.com/go-gitea/gitea/issues/16837#issuecomment-913007382 so that just in case for some reason a cell is nil (which shouldn't happen now) it doesn't throw a 500 error, so the user can at least view the raw diff.
Also fixes in the [view.go](https://github.com/go-gitea/gitea/pull/17018/files#diff-43a7f4747c7ba8bff888c9be11affaafd595fd55d27f3333840eb19df9fad393L521) file how if a CSV file is empty (either created empty or if you edit it and remove all contents) it throws a huge 500 error when you then save it (when you view the file). Since we allow creating, saving and pushing empty files, we shouldn't throw an error on an empty CSV file, but just show its empty contents. This doesn't happen if it is a Markdown file or other type of file that is empty.
EDIT: Now handled in the markup/csv renderer code
silverwind
wxiaoguang
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Kyle D
Yevhen Pavlov
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yp05327
JakobDev
sillyguodong
Brecht Van Lommel
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Lunny Xiao
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Felipe Leopoldo Sologuren Gutiérrez
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André Jaenisch
sebastian-sauer
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Jason Song
MaeIsBad
Jack Hay
Viktor Suprun
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Mario Lubenka
Richard Mahn
