Rename attributes

[westonruter]

Fixes #84.

This PR renames attributes as follows:

Old	New
selectedLines	highlightedLines
showLines	showLineNumbers

When rendering the block on the frontend, the old attributes will still work.

However, when opening the post editor the old deprecated attributes will need to be re-populated. I didn't implement migration of these old attributes because (1) only showLines is in a current release, (2) there are only 400 active installs of this plugin currently, and (3) I wasn't sure how best to do it on the JS side of things.

[westonruter]

(3) I wasn't sure how best to do it on the JS side of things.

This is what I was trying without luck:

diff --git a/src/index.js b/src/index.js
index 304a5c7..2338a09 100644
--- a/src/index.js
+++ b/src/index.js
@@ -270,6 +270,30 @@ const extendCodeBlockWithSyntaxHighlighting = (settings) => {
 				</pre>
 			);
 		},
+
+		deprecated: [
+			...(settings.deprecated || []),
+			{
+				attributes: {
+					...settings.attributes,
+					language: {
+						type: 'string',
+					},
+					showLines: {
+						type: 'boolean',
+					},
+				},
+				migrate(attributes, innerBlocks) {
+					return [
+						{
+							language: attributes.language,
+							showLineNumbers: attributes.showLines,
+						},
+						innerBlocks,
+					];
+				},
+			},
+		],
 	};
 };

[allejo]

How does 8561992 work for you?

[westonruter]

How does 8561992 work for you?

Wow. You did it! I missed the isEligible part. Nice job.

[allejo]

LGTM 👍