Improve issue autolinks (#6273)

* Improve issue autolinks

Update autolinks to match what github does here:

Issue in same repo: #1
Issue in different repo: org/repo#1

Fixes #6264

* Use setting.AppURL when parsing URL

Using setting.AppURL here is a more reliable way of parsing the current
URL and what other functions in this file seem to use.

* Make ComposeMetas always return a valid context

* Add per repository markdown renderers for better context

* Update for use of context metas

Now that we include the user and repo name inside context metas, update
various code and tests for this new logic

6 files changed, 8 insertions, 8 deletions

diff --git a/templates/repo/diff/box.tmpl b/templates/repo/diff/box.tmpl
index 331a17a5e9..2bdf9e5881 100644
--- a/templates/repo/diff/box.tmpl
+++ b/templates/repo/diff/box.tmpl
@@ -202,7 +202,7 @@
             <div class="ui comment form">
                 <div class="ui top attached tabular menu">
                     <a class="active write item">{{$.i18n.Tr "write"}}</a>
-                    <a class="preview item" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{$.RepoLink}}">{{$.i18n.Tr "preview"}}</a>
+                    <a class="preview item" data-url="{{$.Repository.APIURL}}/markdown" data-context="{{$.RepoLink}}">{{$.i18n.Tr "preview"}}</a>
                 </div>
                 <div class="ui bottom attached active write tab segment">
                     <textarea tabindex="1" name="content"></textarea>
diff --git a/templates/repo/diff/comment_form.tmpl b/templates/repo/diff/comment_form.tmpl
index 1fb8b963da..38fd3fa7fb 100644
--- a/templates/repo/diff/comment_form.tmpl
+++ b/templates/repo/diff/comment_form.tmpl
@@ -12,7 +12,7 @@
 		<input type="hidden" name="diff_base_cid">
 		<div class="ui top attached tabular menu" {{if not $.hidden}}onload="assingMenuAttributes(this)" {{end}}data-write="write" data-preview="preview">
 			<a class="active item" data-tab="write">{{$.root.i18n.Tr "write"}}</a>
-			<a class="item" data-tab="preview" data-url="{{$.root.AppSubUrl}}/api/v1/markdown" data-context="{{$.root.RepoLink}}">{{$.root.i18n.Tr "preview"}}</a>
+			<a class="item" data-tab="preview" data-url="{{$.root.Repository.APIURL}}/markdown" data-context="{{$.root.RepoLink}}">{{$.root.i18n.Tr "preview"}}</a>
 		</div>
 		<div class="ui bottom attached active tab segment" data-tab="write">
 			<div class="field">
diff --git a/templates/repo/editor/edit.tmpl b/templates/repo/editor/edit.tmpl
index 82656d6557..134dc818d4 100644
--- a/templates/repo/editor/edit.tmpl
+++ b/templates/repo/editor/edit.tmpl
@@ -30,13 +30,13 @@
 				<div class="ui top attached tabular menu" data-write="write" data-preview="preview" data-diff="diff">
 					<a class="active item" data-tab="write"><i class="octicon octicon-code"></i> {{if .IsNewFile}}{{.i18n.Tr "repo.editor.new_file"}}{{else}}{{.i18n.Tr "repo.editor.edit_file"}}{{end}}</a>
 					{{if not .IsNewFile}}
-					<a class="item" data-tab="preview" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{.RepoLink}}/src/{{.BranchNameSubURL | EscapePound}}" data-preview-file-modes="{{.PreviewableFileModes}}"><i class="octicon octicon-eye"></i> {{.i18n.Tr "preview"}}</a>
+					<a class="item" data-tab="preview" data-url="{{.Repository.APIURL}}/markdown" data-context="{{.RepoLink}}/src/{{.BranchNameSubURL | EscapePound}}" data-preview-file-modes="{{.PreviewableFileModes}}"><i class="octicon octicon-eye"></i> {{.i18n.Tr "preview"}}</a>
 					<a class="item" data-tab="diff" data-url="{{.RepoLink}}/_preview/{{.BranchName | EscapePound}}/{{.TreePath | EscapePound}}" data-context="{{.BranchLink}}"><i class="octicon octicon-diff"></i> {{.i18n.Tr "repo.editor.preview_changes"}}</a>
 					{{end}}
 				</div>
 				<div class="ui bottom attached active tab segment" data-tab="write">
 					<textarea id="edit_area" name="content" data-id="repo-{{.Repository.Name}}-{{.TreePath}}"
-						data-url="{{AppSubUrl}}/api/v1/markdown"
+						data-url="{{.Repository.APIURL}}/markdown"
 						data-context="{{.RepoLink}}"
 						data-markdown-file-exts="{{.MarkdownFileExts}}"
 						data-line-wrap-extensions="{{.LineWrapExtensions}}"
diff --git a/templates/repo/issue/comment_tab.tmpl b/templates/repo/issue/comment_tab.tmpl
index b1630824e5..be113e539a 100644
--- a/templates/repo/issue/comment_tab.tmpl
+++ b/templates/repo/issue/comment_tab.tmpl
@@ -1,10 +1,10 @@
 <div class="field">
 	<div class="ui top attached tabular menu" data-write="write" data-preview="preview">
 		<a class="active item" data-tab="write">{{.i18n.Tr "write"}}</a>
-		<a class="item" data-tab="preview" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{.RepoLink}}">{{.i18n.Tr "preview"}}</a>
+		<a class="item" data-tab="preview" data-url="{{.Repository.APIURL}}/markdown" data-context="{{.RepoLink}}">{{.i18n.Tr "preview"}}</a>
 	</div>
 	<div class="ui bottom attached active tab segment" data-tab="write">
-		<textarea id="content" class="edit_area js-quick-submit" name="content" tabindex="4" data-id="issue-{{.RepoName}}" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{.Repo.RepoLink}}">
+		<textarea id="content" class="edit_area js-quick-submit" name="content" tabindex="4" data-id="issue-{{.RepoName}}" data-url="{{.Repository.APIURL}}/markdown" data-context="{{.Repo.RepoLink}}">
 {{if .BodyQuery}}{{.BodyQuery}}{{else if .IssueTemplate}}{{.IssueTemplate}}{{else if .PullRequestTemplate}}{{.PullRequestTemplate}}{{else}}{{.content}}{{end}}</textarea>
 	</div>
 	<div class="ui bottom attached tab segment markdown" data-tab="preview">
diff --git a/templates/repo/issue/view_content.tmpl b/templates/repo/issue/view_content.tmpl
index 7445dcce86..cb58fbef63 100644
--- a/templates/repo/issue/view_content.tmpl
+++ b/templates/repo/issue/view_content.tmpl
@@ -156,7 +156,7 @@
 	<div class="ui comment form">
 		<div class="ui top attached tabular menu">
 			<a class="active write item">{{$.i18n.Tr "write"}}</a>
-			<a class="preview item" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{$.RepoLink}}">{{$.i18n.Tr "preview"}}</a>
+			<a class="preview item" data-url="{{$.Repository.APIURL}}/markdown" data-context="{{$.RepoLink}}">{{$.i18n.Tr "preview"}}</a>
 		</div>
 		<div class="ui bottom attached active write tab segment">
 			<textarea tabindex="1" name="content"></textarea>
diff --git a/templates/repo/wiki/new.tmpl b/templates/repo/wiki/new.tmpl
index 7dc066ffb8..bf6c24220b 100644
--- a/templates/repo/wiki/new.tmpl
+++ b/templates/repo/wiki/new.tmpl
@@ -17,7 +17,7 @@
 				<input name="title" value="{{.title}}" autofocus required>
 			</div>
 			<div class="field">
-				<textarea class="js-quick-submit" id="edit_area" name="content" data-id="wiki-{{.title}}" data-url="{{AppSubUrl}}/api/v1/markdown" data-context="{{.RepoLink}}/wiki" required>{{if .PageIsWikiEdit}}{{.content}}{{else}}{{.i18n.Tr "repo.wiki.welcome"}}{{end}}</textarea>
+				<textarea class="js-quick-submit" id="edit_area" name="content" data-id="wiki-{{.title}}" data-url="{{.Repository.APIURL}}/markdown" data-context="{{.RepoLink}}/wiki" required>{{if .PageIsWikiEdit}}{{.content}}{{else}}{{.i18n.Tr "repo.wiki.welcome"}}{{end}}</textarea>
 			</div>
 			<div class="field">
 				<input name="message" placeholder="{{.i18n.Tr "repo.wiki.default_commit_message"}}">