Make multi-line charts from text

line Monthly Captures by Fleet
series Blackbeard red, Roberts blue, Vane green
x-label Month
//y-label Captures

era Jan -> Mar Atlantic Season
era Mar -> Jun Caribbean Season teal

Jan 3 5 2
Feb 4 3 4
Mar 2 7 3
Apr 6 4 1
May 5 6 5
Jun 3 8 2

Syntax

line Chart Title
series Series1 color, Series2 color, Series3 color
x-label X Axis Label

Label value1 value2 value3

Metadata Keys

Key	Description	Required
`chart`	Must be `line` (or `multi-line` as an alias)	Yes
`title`	Chart title displayed above the chart	No
`series`	Comma-separated series names with optional colors in parentheses	Yes
`x-label`	Label for the X axis	No
`y-label`	Label for the Y axis	No

Data Format

Each data line provides space-separated values matching the series order:

Jan 3 5 2
Feb 4 3 4

The number of values per line must match the number of series names.

Era Bands

Annotate named time periods with a shaded background band and label:

line Monthly Captures by Fleet
series Blackbeard red, Roberts blue
x-label Month

era Jan -> Mar Q1 green
era Apr -> Jun Q2 orange

Jan 3 5
Feb 4 3
Mar 2 7
Apr 6 4
May 5 6
Jun 3 8

Era syntax: era <start> -> <end> Label color

start and end must exactly match data point labels
Color is optional; omit for the palette default
Era bands render on the first series only

Series Colors

Colors can be specified in parentheses after each series name using named colors:

series Gold yellow, Silver gray, Bronze orange
series Fleet A red, Fleet B blue