ci: improve theme preview action

[rickstaa]

Another try. The following code blocks can be improved, but I currently do not have the time to look at them:

github-readme-stats/scripts/preview-theme.js

Lines 315 to 342 in 78d345d

	// Remove trailing commas (if any).
	let parsedJson = json.replace(/(,\s*})/g, "}");
	// Remove JS comments (if any).
	parsedJson = parsedJson.replace(/\/\/[A-z\s]*\s/g, "");
	// Fix incorrect open bracket (if any).
	const splitJson = parsedJson
	.split(/([\s\r\s]*}[\s\r\s]*,[\s\r\s]*)(?=[\w"-]+:)/)
	.filter((x) => typeof x !== "string" || !!x.trim()); // Split json into array of strings and objects.
	if (splitJson[0].replace(/\s+/g, "") === "},") {
	splitJson[0] = "},";
	if (!/\s*}\s*,?\s*$/.test(splitJson[1])) {
	splitJson.push(splitJson.shift());
	} else {
	splitJson.shift();
	}
	parsedJson = splitJson.join("");
	}
	// Try to parse the fixed json.
	try {
	return Hjson.parse(parsedJson);
	} catch (error) {
	throw new IncorrectJsonFormatError(
	`Theme JSON file could not be parsed: ${error.message}`,
	);
	}

This fixes some differences in syntax between JS and JSON. There is probably a better way to do this (i.e. external library, better regex or change themes.js to themes.json).

https://github.com/anuraghazra/github-readme-stats/blob/78d345d30e7df37d4378f829cdde4820d0cc967b/scripts/preview-theme.js#L405C6-L413

This code gets the additions from the git diff. This code was initially added by @anuraghazra, but I quickly updated it to work with multiple theme additions.

Warning
I already did some tests on multiple theme PRs, and the new syntax seems to work. I would appreciate it if you tested it on some theme PRs.

Tests

• https://github.com/anuraghazra/github-readme-stats/pull/2571/files: Update index.js #2571 (review)
• Theme restructure #2556: Theme restructure #2556 (comment)
• https://github.com/anuraghazra/github-readme-stats/pull/2543/files: Update index.js #2543 (comment)
• https://github.com/anuraghazra/github-readme-stats/pull/2539/files: add holi_theme #2539 (comment)
• https://github.com/anuraghazra/github-readme-stats/pull/2340/files: github_dark_green #2340 (comment)

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Name	Status	Preview	Updated
github-readme-stats	✅ Ready (Inspect)	Visit Preview	Mar 5, 2023 at 0:22AM (UTC)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (ed18914) 97.29% compared to head (78d345d) 97.29%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2572   +/-   ##
=======================================
  Coverage   97.29%   97.29%           
=======================================
  Files          24       24           
  Lines        4215     4215           
  Branches      384      384           
=======================================
  Hits         4101     4101           
  Misses        112      112           
  Partials        2        2           

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