内容简介:Change text color with `chalk` and `gradient-string` inside `react-blessed`The above video is hosted onThis is the7thpost in a series where we will be creating a developer dashboard in the terminal using
Change text color with `chalk` and `gradient-string` inside `react-blessed`
The above video is hosted on egghead.io .
This is the7thpost in a series where we will be creating a developer dashboard in the terminal using react-blessed
and react-blessed-contrib
. For more information about the series and to take a sneak peak at what we're building, go to the 1st post in the series for more context.
- Bootstrap
react-blessed
Application - Add ESLint Rules to
react-blessed
App - Change text font with
figlet
- Extract Component and Add
useInterval
hook - Fetch and display current weather with
weather-js
- Extract custom hook to simplify data fetching
-
Change text color with
chalk
andgradient-string
... ~20 more lessons to come ...
NOTE: You can find the code for this project in GitHub and you watch the whole Build a Terminal Dashboard with React video series on egghead.io .
Current Application
Here we have the beginnings of a React Terminal Dashboard. If we run our application with npm start
you'll see a box displaying the date, time, and the current weather. However, at this point things are pretty boring (other than the fancy ASCII art). So, let's do something about that.
Chalk
To add color to our terminal application we'll use a node library called chalk .
You can manually add colors using ANSI escape codes , but the chalk library provides a much nicer API
// Manually using ANSCI escape codes console.log('\x1b[31mHello World\x1b[0m'); // OR use the chalk API console.log(chalk.red('Hello World'));
Install
To start using the chalk module, we'll install it from the terminal using the following command.
npm install chalk
Update Date and Weather
We'll focus first on updating the date and weather information inside our Today component. To begin import the module at the top of the file with import chalk from "chalk"
. Then, inside the <box>
element, where we are displaying the date, we'll wrap date
with chalk.blue
. To update the weather, we'll update the formatWeather
function and wrap the temperature
, conditions
, low
, and high
variables also with chalk methods.
/* … */ import chalk from 'chalk'; const formatWeather = ([results]) => { const { location, current, forecast } = results; const degreeType = location.degreetype; const temperature = `${current.temperature}°${degreeType}`; const conditions = current.skytext; const low = `${forecast[1].low}°${degreeType}`; const high = `${forecast[1].high}°${degreeType}`; return `${chalk.yellow(temperature)} and ${chalk.green( conditions, )} (${chalk.blue(low)} → ${chalk.red(high)})`;}; export default function Today() { /* … */ return ( <box { /* … */ }> {`${chalk.blue(date)}`} ${/* … */} ${ weather.status === 'loading' ? 'Loading...' : weather.error ? `Error: ${weather.error}` : formatWeather(weather.data) }`} </box> ); }
The results so far of our colorization process is the following.
Gradient String
For our time, however, let's do something a bit more fun.
We'll use a library called gradient-string
that will enable us to have some interesting color effects.
Install
To start using the gradient-string
module, we'll install it from the terminal using the following command.
npm install gradient-string
Update Time
Now, we can come back to our Today component and import gradient from gradient-string
at the top of the file. Then inside our return
statement we'll wrap our time
variable with gradient.rainbow.multiline
(since we are dealing with multi-line content).
NOTE: If you don't use the mult-line method the outcome won't be the desired results. If your content is not multi-line, then using the method is not necessary.
/* … */ import gradient from 'gradient-string' export default function Today() { /* … */ return ( <box { /* … */ }> {`${ /* … */ } ${gradient.rainbow.multiline(time)} ${ /* … */ }`} </box> ) }
Now when we run our app the results have a neat rainbow gradient!
The library has lot of other built-in gradients that you can use or you can create your own ! I've tried a few and I tend to like the atlas
gradient, which is shown below.
Conclusion
Adding a bit of color and gradients to a terminal app is a small thing, but it brings a nice variety to the app. The next lesson will focus on how to position elements within the <box>
(top, right, bottom, center).
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