stringify: add support for tight definitions

Related-to GH-55.
Closes GH-501.

Reviewed-by: Titus Wormer <[email protected]>

Author: spl

packages/remark-stringify/lib/defaults.js

@@ -11,6 +11,7 @@ module.exports = {
   tablePipeAlign: true,
   stringLength: stringLength,
   incrementListMarker: true,
+  tightDefinitions: false,
   fences: false,
   fence: '`',
   bullet: '-',

packages/remark-stringify/lib/macro/block.js

@@ -16,6 +16,7 @@ function block(node) {
   var options = self.options
   var fences = options.fences
   var gap = options.commonmark ? comment : triple
+  var definitionGap = options.tightDefinitions ? lineFeed : blank
   var values = []
   var children = node.children
   var length = children.length
@@ -42,6 +43,11 @@ function block(node) {
           (child.type === 'code' && !child.lang && !fences))
       ) {
         values.push(gap)
+      } else if (
+        previous.type === 'definition' &&
+        child.type === 'definition'
+      ) {
+        values.push(definitionGap)
       } else {
         values.push(blank)
       }

packages/remark-stringify/readme.md

@@ -207,6 +207,13 @@ Increment ordered list item numbers (`boolean`, default: `true`).
 
 When `false`, all list item numbers will be the same.
 
+###### `options.tightDefinitions`
+
+Separate definitions with a single line feed (`boolean`, default: `false`).
+
+When `false`, definitions will have blank lines between them, similar to other
+blocks.
+
 ###### `options.rule`
 
 Marker to use for thematic breaks / horizontal rules (`'-'`, `'*'`, or `'_'`,

packages/remark-stringify/test.js

@@ -187,6 +187,17 @@ test('remark().stringify(ast, file)', function (t) {
     'should throw when `options.incrementListMarker` is not a boolean'
   )
 
+  t.throws(
+    function () {
+      unified()
+        .use(stringify)
+        .data('settings', {tightDefinitions: 'blank'})
+        .stringify(empty())
+    },
+    /options\.tightDefinitions/,
+    'should throw when `options.tightDefinitions` is not a boolean'
+  )
+
   t.throws(
     function () {
       unified()
@@ -1259,6 +1270,27 @@ test('stringify escapes', function (t) {
   t.end()
 })
 
+test('definition separators', function (t) {
+  var tree = u('root', [
+    u('definition', {identifier: 'foo', url: 'first'}),
+    u('definition', {identifier: 'bar', url: 'second'})
+  ])
+
+  t.equal(
+    toString(tree, {tightDefinitions: false}),
+    '[foo]: first\n\n[bar]: second\n',
+    'blank line between definitions'
+  )
+
+  t.equal(
+    toString(tree, {tightDefinitions: true}),
+    '[foo]: first\n[bar]: second\n',
+    'no blank line between definitions'
+  )
+
+  t.end()
+})
+
 function toString(value, options) {
   var tree = typeof value === 'string' ? u('text', value) : value
 

packages/remark-stringify/types/index.d.ts

@@ -32,6 +32,7 @@ declare namespace remarkStringify {
     bullet: '-' | '*' | '+'
     listItemIndent: 'tab' | '1' | 'mixed'
     incrementListMarker: boolean
+    tightDefinitions: boolean
     rule: '-' | '_' | '*'
     ruleRepetition: number
     ruleSpaces: boolean