feat(highlight): add support for chroma

BREAKING CHANGE: You need add params to enable `chroma` or `highlight.js` since they are disabled by default.

2 files changed, 144 insertions, 0 deletions

diff --git a/src/css/_partial/_post/_code.scss b/src/css/_partial/_post/_code.scss
index 2a23a77..71652e6 100644
--- a/src/css/_partial/_post/_code.scss
+++ b/src/css/_partial/_post/_code.scss
@@ -11,6 +11,7 @@ code {
   color: $code-color;
 }
 
+// highlight.js
 figure.highlight {
   margin: 1em 0;
   border-radius: 5px;
@@ -138,3 +139,145 @@ figure.highlight {
     }
   }
 }
+
+// chroma
+.highlight > .chroma {
+  margin: 1em 0;
+  border-radius: 5px;
+  overflow-x: auto;
+  box-shadow: 1px 1px 2px rgba(0,0,0,0.125);
+  position: relative;
+  background: $code-background;
+
+  code {
+    padding: 0;
+  }
+
+  table {
+    position: relative;
+
+    &::after {
+      position: absolute;
+      top: 0;
+      right: 0;
+      left: 0;
+      padding: 2px 7px;
+      font-size: $code-font-size;
+      font-weight: bold;
+      color: darken($gray, 10%);
+      background: darken($code-background, 3%);
+      content: 'Code';
+    }
+  }
+
+  @each $sign, $text in $code-type-list {
+    &.#{$sign} > table::after {
+      content: $text;
+    }
+  }
+
+  .lntd {
+    // Fix code block null line height and
+    // Synchronous gutter and code line highly.
+    line-height: round($code-font-size * 1.5);
+
+    &:first-child {
+      width: 10px;
+
+      pre {
+        margin: 0;
+        padding: 30px 7px 10px;
+      }
+    }
+
+    &:last-child {
+      vertical-align: top;
+
+      pre {
+        margin: 0;
+        padding: 30px 10px 10px;
+      }
+    }
+  }
+
+  table, tr, td {
+    margin: 0;
+    padding: 0;
+    width: 100%;
+    border-collapse: collapse;
+  }
+
+  /* LineNumbersTable */  .lnt { color: $gray; }
+  /* LineHighlight */  .hl { display: block; width: 100%; background-color: #ffffcc }
+
+  /* Keyword */  .k { color: #859900 }
+  /* KeywordConstant */  .kc { color: #859900; font-weight: bold }
+  /* KeywordDeclaration */  .kd { color: #859900 }
+  /* KeywordNamespace */  .kn { color: #dc322f; font-weight: bold }
+  /* KeywordPseudo */  .kp { color: #859900 }
+  /* KeywordReserved */  .kr { color: #859900 }
+  /* KeywordType */  .kt { color: #859900; font-weight: bold }
+  /* Name */  .n { color: #268bd2 }
+  /* NameAttribute */  .na { color: #268bd2 }
+  /* NameBuiltin */  .nb { color: #cb4b16 }
+  /* NameBuiltinPseudo */  .bp { color: #268bd2 }
+  /* NameClass */  .nc { color: #cb4b16 }
+  /* NameConstant */  .no { color: #268bd2 }
+  /* NameDecorator */  .nd { color: #268bd2 }
+  /* NameEntity */  .ni { color: #268bd2 }
+  /* NameException */  .ne { color: #268bd2 }
+  /* NameFunction */  .nf { color: #268bd2 }
+  /* NameFunctionMagic */  .fm { color: #268bd2 }
+  /* NameLabel */  .nl { color: #268bd2 }
+  /* NameNamespace */  .nn { color: #268bd2 }
+  /* NameOther */  .nx { color: #268bd2 }
+  /* NameProperty */  .py { color: #268bd2 }
+  /* NameTag */  .nt { color: #268bd2; font-weight: bold }
+  /* NameVariable */  .nv { color: #268bd2 }
+  /* NameVariableClass */  .vc { color: #268bd2 }
+  /* NameVariableGlobal */  .vg { color: #268bd2 }
+  /* NameVariableInstance */  .vi { color: #268bd2 }
+  /* NameVariableMagic */  .vm { color: #268bd2 }
+  /* Literal */  .l { color: #2aa198 }
+  /* LiteralDate */  .ld { color: #2aa198 }
+  /* LiteralString */  .s { color: #2aa198 }
+  /* LiteralStringAffix */  .sa { color: #2aa198 }
+  /* LiteralStringBacktick */  .sb { color: #2aa198 }
+  /* LiteralStringChar */  .sc { color: #2aa198 }
+  /* LiteralStringDelimiter */  .dl { color: #2aa198 }
+  /* LiteralStringDoc */  .sd { color: #2aa198 }
+  /* LiteralStringDouble */  .s2 { color: #2aa198 }
+  /* LiteralStringEscape */  .se { color: #2aa198 }
+  /* LiteralStringHeredoc */  .sh { color: #2aa198 }
+  /* LiteralStringInterpol */  .si { color: #2aa198 }
+  /* LiteralStringOther */  .sx { color: #2aa198 }
+  /* LiteralStringRegex */  .sr { color: #2aa198 }
+  /* LiteralStringSingle */  .s1 { color: #2aa198 }
+  /* LiteralStringSymbol */  .ss { color: #2aa198 }
+  /* LiteralNumber */  .m { color: #2aa198; font-weight: bold }
+  /* LiteralNumberBin */  .mb { color: #2aa198; font-weight: bold }
+  /* LiteralNumberFloat */  .mf { color: #2aa198; font-weight: bold }
+  /* LiteralNumberHex */  .mh { color: #2aa198; font-weight: bold }
+  /* LiteralNumberInteger */  .mi { color: #2aa198; font-weight: bold }
+  /* LiteralNumberIntegerLong */  .il { color: #2aa198; font-weight: bold }
+  /* LiteralNumberOct */  .mo { color: #2aa198; font-weight: bold }
+  /* OperatorWord */  .ow { color: #859900 }
+  /* Comment */  .c { color: #93a1a1; font-style: italic }
+  /* CommentHashbang */  .ch { color: #93a1a1; font-style: italic }
+  /* CommentMultiline */  .cm { color: #93a1a1; font-style: italic }
+  /* CommentSingle */  .c1 { color: #93a1a1; font-style: italic }
+  /* CommentSpecial */  .cs { color: #93a1a1; font-style: italic }
+  /* CommentPreproc */  .cp { color: #93a1a1; font-style: italic }
+  /* CommentPreprocFile */  .cpf { color: #93a1a1; font-style: italic }
+  /* Generic */  .g { color: #d33682 }
+  /* GenericDeleted */  .gd { color: #d33682 }
+  /* GenericEmph */  .ge { color: #d33682 }
+  /* GenericError */  .gr { color: #d33682 }
+  /* GenericHeading */  .gh { color: #d33682 }
+  /* GenericInserted */  .gi { color: #d33682 }
+  /* GenericOutput */  .go { color: #d33682 }
+  /* GenericPrompt */  .gp { color: #d33682 }
+  /* GenericStrong */  .gs { color: #d33682 }
+  /* GenericSubheading */  .gu { color: #d33682 }
+  /* GenericTraceback */  .gt { color: #d33682 }
+}
diff --git a/src/css/_variables.scss b/src/css/_variables.scss
index 06d7507..ef3fea7 100644
--- a/src/css/_variables.scss
+++ b/src/css/_variables.scss
@@ -235,6 +235,7 @@ $code-type-list: (
 
   language-erlang: "Erlang",
   language-go: "Go",
+  language-go-html-template: "Go HTML Template",
   language-groovy: "Groovy",
   language-haskell: "Haskell",
   language-kotlin: "Kotlin",