Refactor repo clone button and repo clone links, fix JS error on empty repo page (#19208)

The last PR about clone buttons introduced an JS error when visiting an empty repo page:
* https://github.com/go-gitea/gitea/pull/19028
* `Uncaught ReferenceError: isSSH is not defined`, because the variables are scoped and doesn't share between sub templates.

This:
1. Simplify `templates/repo/clone_buttons.tmpl` and make code clear
2. Move most JS code into `initRepoCloneLink`
3. Remove unused `CloneLink.Git`
4. Remove `ctx.Data["DisableSSH"] / ctx.Data["ExposeAnonSSH"] / ctx.Data["DisableHTTP"]`, and only set them when is is needed (eg: deploy keys / ssh keys)
5. Introduce `Data["CloneButton*"]` to provide data for clone buttons and links
6. Introduce `Data["RepoCloneLink"]` for the repo clone link (not the wiki)
7. Remove most `ctx.Data["PageIsWiki"]` because it has been set in the `/wiki` middleware
8. Remove incorrect `quickstart` class in `migrating.tmpl`

5 files changed, 36 insertions, 49 deletions

diff --git a/templates/base/head.tmpl b/templates/base/head.tmpl
index 68d14af51d..2a9c24255d 100644
--- a/templates/base/head.tmpl
+++ b/templates/base/head.tmpl
@@ -12,7 +12,7 @@
 	<meta name="keywords" content="{{MetaKeywords}}">
 	<meta name="referrer" content="no-referrer" />
 {{if .GoGetImport}}
-	<meta name="go-import" content="{{.GoGetImport}} git {{.CloneLink.HTTPS}}">
+	<meta name="go-import" content="{{.GoGetImport}} git {{.RepoCloneLink.HTTPS}}">
 	<meta name="go-source" content="{{.GoGetImport}} _ {{.GoDocDirectory}} {{.GoDocFile}}">
 {{end}}
 {{if .FeedURL}}
diff --git a/templates/repo/clone_buttons.tmpl b/templates/repo/clone_buttons.tmpl
index d4b822521c..cee7e31965 100644
--- a/templates/repo/clone_buttons.tmpl
+++ b/templates/repo/clone_buttons.tmpl
@@ -1,42 +1,24 @@
-{{if not $.DisableHTTP}}
-	<button class="ui basic clone button no-transition" id="repo-clone-https" data-link="{{if $.PageIsWiki}}{{$.WikiCloneLink.HTTPS}}{{else}}{{$.CloneLink.HTTPS}}{{end}}">
+<!-- there is always at least one button (by context/repo.go) -->
+{{if $.CloneButtonShowHTTPS}}
+	<button class="ui basic clone button no-transition" id="repo-clone-https" data-link="{{$.CloneButtonOriginLink.HTTPS}}">
 		{{if UseHTTPS}}HTTPS{{else}}HTTP{{end}}
 	</button>
 {{end}}
-{{if and (not $.DisableSSH) (or $.IsSigned $.ExposeAnonSSH)}}
-	<button class="ui basic clone button no-transition" id="repo-clone-ssh" data-link="{{if $.PageIsWiki}}{{$.WikiCloneLink.SSH}}{{else}}{{$.CloneLink.SSH}}{{end}}">
+{{if $.CloneButtonShowSSH}}
+	<button class="ui basic clone button no-transition" id="repo-clone-ssh" data-link="{{$.CloneButtonOriginLink.SSH}}">
 		SSH
 	</button>
 {{end}}
-{{if not $.DisableHTTP}}
-	<input id="repo-clone-url" value="{{if $.PageIsWiki}}{{$.WikiCloneLink.HTTPS}}{{else}}{{$.CloneLink.HTTPS}}{{end}}" readonly>
-{{else if and (not .DisableSSH) (or $.IsSigned $.ExposeAnonSSH)}}
-	<input id="repo-clone-url" value="{{if $.PageIsWiki}}{{$.WikiCloneLink.SSH}}{{else}}{{$.CloneLink.SSH}}{{end}}" readonly>
-{{end}}
-{{if or (not $.DisableHTTP) (and (not $.DisableSSH) (or $.IsSigned $.ExposeAnonSSH))}}
-	<button class="ui basic icon button tooltip" id="clipboard-btn" data-content="{{.i18n.Tr "copy_url"}}" data-clipboard-target="#repo-clone-url">
-		{{svg "octicon-paste"}}
-	</button>
-{{end}}
-{{if not (and $.DisableHTTP $.DisableSSH)}}
-	<script>
-		<!-- /* eslint-disable */ -->
-		window.config.pageData['repoCloneButtons']= {httpsDisabled: {{$.DisableHTTP}}};
-	</script>
-	<script>
-		(() => {
-			const tmplData = window.config.pageData.repoCloneButtons;
-			const isSSH = tmplData.httpsDisabled || localStorage.getItem('repo-clone-protocol') === 'ssh';
-			const sshButton = document.getElementById('repo-clone-ssh');
-			const httpsButton = document.getElementById('repo-clone-https');
-			const input = document.getElementById('repo-clone-url');
-			if (input) input.value = (isSSH ? sshButton : httpsButton).getAttribute('data-link');
-			if (sshButton) sshButton.classList[isSSH ? 'add' : 'remove']('primary');
-			if (httpsButton) httpsButton.classList[isSSH ? 'remove' : 'add']('primary');
-			setTimeout(() => {
-				if (sshButton) sshButton.classList.remove('no-transition');
-				if (httpsButton) httpsButton.classList.remove('no-transition');
-			}, 100);
-		})();
-	</script>
-{{end}}
+<!-- the value will be updated by initRepoCloneLink, the code below is used to avoid UI flicking  -->
+<input id="repo-clone-url" value="" readonly>
+<script>
+	(() => {
+		const proto = localStorage.getItem('repo-clone-protocol') || 'https';
+		const btn = document.getElementById(`repo-clone-${proto}`);
+		// it's ok if we don't find the btn here, initRepoCloneLink will take care of it
+		document.getElementById('repo-clone-url').value = btn ? btn.getAttribute('data-link') : '';
+	})();
+</script>
+<button class="ui basic icon button tooltip" id="clipboard-btn" data-content="{{.i18n.Tr "copy_url"}}" data-clipboard-target="#repo-clone-url">
+	{{svg "octicon-paste"}}
+</button>
diff --git a/templates/repo/empty.tmpl b/templates/repo/empty.tmpl
index 6da9e28e16..eee607ecaf 100644
--- a/templates/repo/empty.tmpl
+++ b/templates/repo/empty.tmpl
@@ -18,7 +18,7 @@
 					<h4 class="ui top attached header">
 						{{.i18n.Tr "repo.quick_guide"}}
 					</h4>
-					<div class="ui attached guide table segment">
+					<div class="ui attached guide table segment empty-repo-guide">
 						<div class="item">
 							<h3>{{.i18n.Tr "repo.clone_this_repo"}} <small>{{.i18n.Tr "repo.clone_helper" "http://git-scm.com/book/en/Git-Basics-Getting-a-Git-Repository" | Str2html}}</small></h3>
 							<div class="ui action small input">
@@ -37,7 +37,7 @@ git init
 {{if ne .Repository.DefaultBranch "master"}}git checkout -b {{.Repository.DefaultBranch}}{{end}}
 git add README.md
 git commit -m "first commit"
-git remote add origin <span class="clone-url">{{$.CloneLink.HTTPS}}</span>
+git remote add origin <span class="clone-url"></span>
 git push -u origin {{.Repository.DefaultBranch}}</code></pre>
 								</div>
 							</div>
@@ -46,18 +46,23 @@ git push -u origin {{.Repository.DefaultBranch}}</code></pre>
 							<div class="item">
 								<h3>{{.i18n.Tr "repo.push_exist_repo"}}</h3>
 								<div class="markup">
-									<pre><code>git remote add origin <span class="clone-url">{{$.CloneLink.HTTPS}}</span>
+									<pre><code>git remote add origin <span class="clone-url"></span>
 git push -u origin {{.Repository.DefaultBranch}}</code></pre>
 								</div>
 							</div>
-							<script defer>
-								/* eslint-disable no-undef */
-								const cloneUrls = document.getElementsByClassName('clone-url');
-								if (cloneUrls) {
-									for (let i = 0; i < cloneUrls.length; i++) {
-										cloneUrls[i].textContent = (isSSH ? sshButton : httpsButton).getAttribute('data-link');
+							<!-- the clone-url content will be updated by initRepoCloneLink, the code below is used to avoid UI flicking  -->
+							<script>
+								(() => {
+									const proto = localStorage.getItem('repo-clone-protocol') || 'https';
+									const btn = document.getElementById(`repo-clone-${proto}`);
+									const cloneUrls = document.getElementsByClassName('clone-url');
+									// it's ok if we didn't find the btn here, initRepoCloneLink will take all the work
+									if (btn) {
+										for (let i = 0; i < cloneUrls.length; i++) {
+											cloneUrls[i].textContent = btn.getAttribute('data-link');
+										}
 									}
-								}
+								})();
 							</script>
 						{{end}}
 					{{else}}
diff --git a/templates/repo/home.tmpl b/templates/repo/home.tmpl
index 30f1471c16..c146f474ee 100644
--- a/templates/repo/home.tmpl
+++ b/templates/repo/home.tmpl
@@ -125,7 +125,7 @@
 								<a class="item archive-link" href="{{$.RepoLink}}/archive/{{PathEscapeSegments $.BranchName}}.zip" rel="nofollow">{{svg "octicon-file-zip" 16 "mr-3"}}{{.i18n.Tr "repo.download_zip"}}</a>
 								<a class="item archive-link" href="{{$.RepoLink}}/archive/{{PathEscapeSegments $.BranchName}}.tar.gz" rel="nofollow">{{svg "octicon-file-zip" 16 "mr-3"}}{{.i18n.Tr "repo.download_tar"}}</a>
 								<a class="item archive-link" href="{{$.RepoLink}}/archive/{{PathEscapeSegments $.BranchName}}.bundle" rel="nofollow">{{svg "octicon-package" 16 "mr-3"}}{{.i18n.Tr "repo.download_bundle"}}</a>
-								<a class="item" href="vscode://vscode.git/clone?url={{if $.PageIsWiki}}{{$.WikiCloneLink.HTTPS}}{{else}}{{$.CloneLink.HTTPS}}{{end}}">{{svg "gitea-vscode" 16 "mr-3"}}{{.i18n.Tr "repo.clone_in_vsc"}}</a>
+								<a class="item" href="vscode://vscode.git/clone?url={{$.RepoCloneLink.HTTPS}}">{{svg "gitea-vscode" 16 "mr-3"}}{{.i18n.Tr "repo.clone_in_vsc"}}</a>
 							</div>
 						</button>
 					</div>
diff --git a/templates/repo/migrate/migrating.tmpl b/templates/repo/migrate/migrating.tmpl
index 6df7f0a65d..8858e88dad 100644
--- a/templates/repo/migrate/migrating.tmpl
+++ b/templates/repo/migrate/migrating.tmpl
@@ -1,5 +1,5 @@
 {{template "base/head" .}}
-<div class="page-content repository quickstart">
+<div class="page-content repository">
 	{{template "repo/header" .}}
 	<div class="ui container">
 		<div class="ui grid">