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+# postcss-message-helpers [![Build Status](https://travis-ci.org/MoOx/postcss-message-helpers.png)](https://travis-ci.org/MoOx/postcss-message-helpers)
+
+> [PostCSS](https://github.com/postcss/postcss) helpers to throw or output GNU style messages.
+
+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`
+
+## Installation
+
+```console
+$ npm install postcss-message-helpers
+```
+
+```js
+var messageHelpers = require("postcss-message-helpers")
+```
+
+## Usage
+
+### `var fnValue = messageHelpers.try(fn, source)`
+
+Execute `fn` an return the value.
+If an exception is thrown during the process, the exception will be catched, enhanced from source & re-throw.
+
+### `var sourceMessage = messageHelpers.message(message, source)`
+
+Returns a message like `sourcefile:lineno:column: message`.  
+`source` should be a postcss source object from a node.
+
+### `var source = messageHelpers.source(source)`
+
+Returns `sourcefile:lineno:column` for a given `source` postcss object.
+
+### Example
+
+```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](test) for more examples.
+
+---
+
+## Contributing
+
+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
+
+## [Changelog](CHANGELOG.md)
+
+## [License](LICENSE)