Remove jQuery from the code diff expansion buttons (#29385)

- Removed all jQuery AJAX calls and replaced with htmx
- Tested the code diff expansion buttons functionality and it works as
before plus a loading indicator

# Demo using `htmx` instead of jQuery AJAX

![action](https://github.com/go-gitea/gitea/assets/20454870/afba7442-ed56-4d39-b764-835d1f6c3a9c)

Signed-off-by: Yarden Shoham <git@yardenshoham.com>

4 files changed, 12 insertions, 20 deletions

diff --git a/templates/repo/diff/blob_excerpt.tmpl b/templates/repo/diff/blob_excerpt.tmpl
index 2dff28a965..353f6db705 100644
--- a/templates/repo/diff/blob_excerpt.tmpl
+++ b/templates/repo/diff/blob_excerpt.tmpl
@@ -5,17 +5,17 @@
 			<td class="lines-num lines-num-old" data-line-num="{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}">
 				<div class="gt-df">
 				{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
-					<button class="code-expander-button" data-url="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=down&wiki={{$.PageIsWiki}}" data-anchor="{{$.Anchor}}">
+					<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=down&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 						{{svg "octicon-fold-down"}}
 					</button>
 				{{end}}
 				{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 4)}}
-					<button class="code-expander-button" data-url="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=up&wiki={{$.PageIsWiki}}" data-anchor="{{$.Anchor}}">
+					<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=up&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 						{{svg "octicon-fold-up"}}
 					</button>
 				{{end}}
 				{{if eq $line.GetExpandDirection 2}}
-					<button class="code-expander-button" data-url="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=&wiki={{$.PageIsWiki}}" data-anchor="{{$.Anchor}}">
+					<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 						{{svg "octicon-fold"}}
 					</button>
 				{{end}}
@@ -51,17 +51,17 @@
 			<td colspan="2" class="lines-num">
 				<div class="gt-df">
 					{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
-						<button class="code-expander-button" data-url="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=unified&direction=down&wiki={{$.PageIsWiki}}" data-anchor="{{$.Anchor}}">
+						<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?data-query={{$line.GetBlobExcerptQuery}}&style=unified&direction=down&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 							{{svg "octicon-fold-down"}}
 						</button>
 					{{end}}
 					{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 4)}}
-						<button class="code-expander-button" data-url="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=unified&direction=up&wiki={{$.PageIsWiki}}" data-anchor="{{$.Anchor}}">
+						<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?data-query={{$line.GetBlobExcerptQuery}}&style=unified&direction=up&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 							{{svg "octicon-fold-up"}}
 						</button>
 					{{end}}
 					{{if eq $line.GetExpandDirection 2}}
-						<button class="code-expander-button" data-url="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=unified&direction=&wiki={{$.PageIsWiki}}" data-anchor="{{$.Anchor}}">
+						<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?data-query={{$line.GetBlobExcerptQuery}}&style=unified&direction=&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 							{{svg "octicon-fold"}}
 						</button>
 					{{end}}
diff --git a/templates/repo/diff/section_split.tmpl b/templates/repo/diff/section_split.tmpl
index 5b0d982e96..672193565b 100644
--- a/templates/repo/diff/section_split.tmpl
+++ b/templates/repo/diff/section_split.tmpl
@@ -18,17 +18,17 @@
 					<td class="lines-num lines-num-old">
 						<div class="gt-df">
 						{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
-							<button class="code-expander-button" data-url="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=down&wiki={{$.root.PageIsWiki}}" data-anchor="diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
+							<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=down&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 								{{svg "octicon-fold-down"}}
 							</button>
 						{{end}}
 						{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 4)}}
-							<button class="code-expander-button" data-url="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=up&wiki={{$.root.PageIsWiki}}" data-anchor="diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
+							<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=up&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 								{{svg "octicon-fold-up"}}
 							</button>
 						{{end}}
 						{{if eq $line.GetExpandDirection 2}}
-							<button class="code-expander-button" data-url="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=split&direction=&wiki={{$.root.PageIsWiki}}" data-anchor="diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
+							<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 								{{svg "octicon-fold"}}
 							</button>
 						{{end}}
diff --git a/templates/repo/diff/section_unified.tmpl b/templates/repo/diff/section_unified.tmpl
index 2b901411e2..2c271d0866 100644
--- a/templates/repo/diff/section_unified.tmpl
+++ b/templates/repo/diff/section_unified.tmpl
@@ -14,17 +14,17 @@
 					<td colspan="2" class="lines-num">
 						<div class="gt-df">
 							{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
-								<button class="code-expander-button" data-url="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=unified&direction=down&wiki={{$.root.PageIsWiki}}" data-anchor="diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
+								<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=unified&direction=down&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 									{{svg "octicon-fold-down"}}
 								</button>
 							{{end}}
 							{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 4)}}
-								<button class="code-expander-button" data-url="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=unified&direction=up&wiki={{$.root.PageIsWiki}}" data-anchor="diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
+								<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=unified&direction=up&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 									{{svg "octicon-fold-up"}}
 								</button>
 							{{end}}
 							{{if eq $line.GetExpandDirection 2}}
-								<button class="code-expander-button" data-url="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}" data-query="{{$line.GetBlobExcerptQuery}}&style=unified&direction=&wiki={{$.root.PageIsWiki}}" data-anchor="diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
+								<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=unified&direction=&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 									{{svg "octicon-fold"}}
 								</button>
 							{{end}}
diff --git a/web_src/js/features/repo-code.js b/web_src/js/features/repo-code.js
index a142313211..c4a81ea165 100644
--- a/web_src/js/features/repo-code.js
+++ b/web_src/js/features/repo-code.js
@@ -186,14 +186,6 @@ export function initRepoCodeView() {
   $(document).on('click', '.fold-file', ({currentTarget}) => {
     invertFileFolding(currentTarget.closest('.file-content'), currentTarget);
   });
-  $(document).on('click', '.code-expander-button', async ({currentTarget}) => {
-    const url = currentTarget.getAttribute('data-url');
-    const query = currentTarget.getAttribute('data-query');
-    const anchor = currentTarget.getAttribute('data-anchor');
-    if (!url) return;
-    const blob = await $.get(`${url}?${query}&anchor=${anchor}`);
-    currentTarget.closest('tr').outerHTML = blob;
-  });
   $(document).on('click', '.copy-line-permalink', async ({currentTarget}) => {
     await clippie(toAbsoluteUrl(currentTarget.getAttribute('data-url')));
   });