Direct SVG rendering (#12157)

Introduce 'make svg' which calls a node script that compiles svg files
to `public/img/svg`. These files are vendored to not create a dependency
on Node for the backend build.

On the frontend side, configure webpack using `raw-loader` so SVGs can
be imported as string.

Also moved our existing SVGs to web_src/svg for consistency.

Fixes: https://github.com/go-gitea/gitea/issues/11618

1 files changed, 30 insertions, 0 deletions

diff --git a/web_src/js/svg.js b/web_src/js/svg.js
new file mode 100644
index 0000000000..5e66a4dd1a
--- /dev/null
+++ b/web_src/js/svg.js
@@ -0,0 +1,30 @@
+import octiconGitMerge from '../../public/img/svg/octicon-git-merge.svg';
+import octiconGitPullRequest from '../../public/img/svg/octicon-git-pull-request.svg';
+import octiconIssueClosed from '../../public/img/svg/octicon-issue-closed.svg';
+import octiconIssueOpened from '../../public/img/svg/octicon-issue-opened.svg';
+import octiconLink from '../../public/img/svg/octicon-link.svg';
+
+const svgs = {
+  'octicon-git-merge': octiconGitMerge,
+  'octicon-git-pull-request': octiconGitPullRequest,
+  'octicon-issue-closed': octiconIssueClosed,
+  'octicon-issue-opened': octiconIssueOpened,
+  'octicon-link': octiconLink,
+};
+
+const parser = new DOMParser();
+const serializer = new XMLSerializer();
+
+// retrieve a HTML string for given SVG icon name and size in pixels
+export function svg(name, size = 16) {
+  if (name in svgs) {
+    if (size === 16) return svgs[name];
+
+    const document = parser.parseFromString(svgs[name], 'image/svg+xml');
+    const svgNode = document.firstChild;
+    svgNode.setAttribute('width', String(size));
+    svgNode.setAttribute('height', String(size));
+    return serializer.serializeToString(svgNode);
+  }
+  return '';
+}