PostCSS helpers to throw or output GNU style messages
npm install postcss-message-helpers> PostCSS helpers to throw or output GNU style messages.
This modules offers you some function to throw or just output messages with GNU style: sourcefile:lineno:column: message
``console`
$ npm install postcss-message-helpers
`js`
var messageHelpers = require("postcss-message-helpers")
Execute fn an return the value.
If an exception is thrown during the process, the exception will be catched, enhanced from source & re-throw.
Returns a message like sourcefile:lineno:column: message. source should be a postcss source object from a node.
Returns sourcefile:lineno:column for a given source postcss object.
`js
// dependencies
var fs = require("fs")
var postcss = require("postcss")
var messageHelpers = require("postcss-message-helpers")
// css to be processed
var css = fs.readFileSync("input.css", "utf8")
// process css
var output = postcss()
.use(function(styles) {
styles.eachDecl(function transformDecl(decl) {
// will catch, adjust error stack, line, column & message (gnu style) then re-throw
messageHelpers.try(function IwillThrow() {
if (decl.value.indexOf("error(") > -1) {
throw new Error("error detected: " + decl.value)
}
}, decl.source)
// will output a gnu style warning
if (decl.value.indexOf("warning(") > -1) {
console.warning(messageHelpers.message("warning: " + decl.value, decl.source))
}
})
})
.process(css)
.css
``
Checkout tests for more examples.
---
Work on a branch, install dev-dependencies, respect coding style & run tests before submitting a bug fix or a feature.
$ git clone https://github.com/MoOx/postcss-message-helpers.git
$ git checkout -b patch-1
$ npm install
$ npm test