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