Codeblock line highlighting

[dwbelliston]

Would be awesome to be able to highlight lines in a code block to call out specific lines.

thanks!

  """yaml # hl_lines="9 14 24 25 26 28"
  CloudVelumAlarm:
      Type: AWS::CloudWatch::Alarm
      Properties:
          ActionsEnabled: Boolean
          AlarmActions:
              - String
          AlarmDescription: String
          AlarmName: String
          ComparisonOperator: String
          DatapointsToAlarm: Integer
          Dimensions:
              - Dimension
          EvaluateLowSampleCountPercentile: String
          EvaluationPeriods: Integer
          ExtendedStatistic: String
          InsufficientDataActions:
              - String
          MetricName: String
          Metrics:
              - MetricDataQuery
          Namespace: String
          OKActions:
              - String
          Period: Integer
          Statistic: String
          Threshold: Double
          ThresholdMetricId: String
          TreatMissingData: String
          Unit: String
   """

[fabriciomurta]

It does not look that difficult to support. Our underlying code block highlighting library, PrismJS, does support this feature via a plugin. So, basically a matter of assessing the resources size increase and best syntax we could map from markdown to specify these line intervals. I believe it should at least follow that "print pages interval" syntax, which seems pretty intuitive and widely used.

That is, 9,14,24-26,28, maybe avoiding spaces, or consuming it only if the preceding character is a comma.

[geoffreymcgill]

Line highlighting within code block components has been implemented and will be available in the next public release of Retype.

Here are few samples demonstrating how to configure and a screen capture of each sample:

Highlight a single line

```js #2
```

Highlight a range of lines

```js #2-5
```

Highlight several ranges

```js #1-2,4-8
```

Highlight without line numbers

```js !#1-2,4-8
```

Highlight using attribute syntax

```js:highlight="1-2,4-8"
```

[DannyBen]

Beautiful implementation.