chore: add prismjs for syntax highlighting

1 files changed, 62 insertions, 0 deletions

diff --git a/public/prism/prism-diff.js b/public/prism/prism-diff.js
new file mode 100644
index 0000000..44e111a
--- /dev/null
+++ b/public/prism/prism-diff.js
@@ -0,0 +1,62 @@
+(function (Prism) {
+  Prism.languages.diff = {
+    coord: [
+      // Match all kinds of coord lines (prefixed by "+++", "---" or "***").
+      /^(?:\*{3}|-{3}|\+{3}).*$/m,
+      // Match "@@ ... @@" coord lines in unified diff.
+      /^@@.*@@$/m,
+      // Match coord lines in normal diff (starts with a number).
+      /^\d.*$/m,
+    ],
+
+    // deleted, inserted, unchanged, diff
+  };
+
+  /**
+   * A map from the name of a block to its line prefix.
+   *
+   * @type {Object<string, string>}
+   */
+  var PREFIXES = {
+    'deleted-sign': '-',
+    'deleted-arrow': '<',
+    'inserted-sign': '+',
+    'inserted-arrow': '>',
+    unchanged: ' ',
+    diff: '!',
+  };
+
+  // add a token for each prefix
+  Object.keys(PREFIXES).forEach(function (name) {
+    var prefix = PREFIXES[name];
+
+    var alias = [];
+    if (!/^\w+$/.test(name)) {
+      // "deleted-sign" -> "deleted"
+      alias.push(/\w+/.exec(name)[0]);
+    }
+    if (name === 'diff') {
+      alias.push('bold');
+    }
+
+    Prism.languages.diff[name] = {
+      pattern: RegExp('^(?:[' + prefix + '].*(?:\r\n?|\n|(?![\\s\\S])))+', 'm'),
+      alias: alias,
+      inside: {
+        line: {
+          pattern: /(.)(?=[\s\S]).*(?:\r\n?|\n)?/,
+          lookbehind: true,
+        },
+        prefix: {
+          pattern: /[\s\S]/,
+          alias: /\w+/.exec(name)[0],
+        },
+      },
+    };
+  });
+
+  // make prefixes available to Diff plugin
+  Object.defineProperty(Prism.languages.diff, 'PREFIXES', {
+    value: PREFIXES,
+  });
+})(Prism);