messagetemplates-fsharp

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messagetemplates-fsharp

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Message templates - the ability to format named string values, and capture the properties

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- tasks.json
- - FsMessageTemplates.fsproj
  - MessageTemplates.fs
  - MessageTemplates.fsi
- - FsMtParser.fs
  - FsMtParser.fsproj
  - FsMtParserFull.fs
  - FsMtParserFullTest.fsx
  - FsMtParserTest.fsx
- - CsToFs.fs
  - FSharpTypesDestructuringPolicy.fs
  - FsMessageTemplates.Tests.fsproj
  - FsTests.Capture.fs
  - FsTests.Format.fs
  - FsTests.Parser.fs
  - MtAssert.fs
  - Tk.fs
  - XunitSupport.fs
- - dotnet-cli-preview2.sln
  - global.json
- - FsMessageTemplates.net45.sln
- configure-dotnet-cli-osx.sh
.gitattributes
.gitignore
.travis.yml
appveyor.yml
build.cmd
Build.ps1
build.sh
global.json
Install.ps1
LICENSE
messagetemplates-fsharp.sln
README.md

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An implementation of {named} string replacements, which allows formatting, parsing, and capturing properties.

`FsMessageTemplates` is compatible with the [Message Templates Standard](http://messagetemplates.org/).

The F# implementation was designed to be paket-github referenced, or installed as a nuget package.

[![Build status](https://ci.appveyor.com/api/projects/status/e2y2xpegw081p0tl?svg=true)](https://ci.appveyor.com/project/adamchester/messagetemplates-fsharp)
[![NuGet](https://img.shields.io/nuget/v/FsMessageTemplates.svg?maxAge=2592000)](https://www.nuget.org/packages/FsMessageTemplates)

### Samples

#### Format an F# Record
```fsharp
type User = { Id:int; Name:string }
format (parse "Hello, {@user}") [| {Id=1; Name="Adam"} |]
// > val it : string = "Hello, User { Id: 1, Name: "Adam" }"
```

### Message Template Syntax

[Message Templates](http://messagetemplates.org/) are a superset of standard .NET format strings, so any format string acceptable to `string.Format()` will also be correctly processed by `FsMessageTemplates`.

* Property names are written between `{` and `}` brackets
* Brackets can be escaped by doubling them, e.g. `{{` will be rendered as `{`
* Formats that use numeric property names, like `{0}` and `{1}` exclusively, will be matched with the `Format` method's parameters by treating the property names as indexes; this is identical to `string.Format()`'s behaviour
* If any of the property names are non-numeric, then all property names will be matched from left-to-right with the `Format` method's parameters
* Property names may be prefixed with an optional operator, `@` or `$`, to control how the property is serialised
* Property names may be suffixed with an optional format, e.g. `:000`, to control how the property is rendered; these format strings behave exactly as their counterparts within the `string.Format()` syntax

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