Export-Fake4TargetsGraph.ps1

<#
.SYNOPSIS
Exports a graph of a Fake4 build script's targets.

.NOTES
TODO: Parameterize build script file.
TODO: Parameterize build target, and include only it and its dependencies.
TODO: Invoke-Item?

.EXAMPLE
Export-Fake4TargetsGraph.ps1

Parses build.fsx and shows the target dependency graph in build.svg.
#>

#Requires -Version 3
[CmdletBinding()][OutputType([void])] Param(
# The name of the Graphviz rendering engine to use.
[ValidateSet('dot','circo','sfdp','twopi')][string] $Renderer = 'dot',
# The output format of the graph.
[ValidateSet('bmp','gif','gv','jpg','pdf','png','ps','svg','svgz','tiff','vml','vmlz')]
[string] $Format = 'svg',
# The filename to output the graph to.
[string] $OutFile = "build.$Format",
# The specific version of Fake4 to install if it is missing.
[ValidatePattern('\A4\.\S+\z')]
[string] $FakeVersion = '4.64.17'
)
Begin
{
    Use-Command.ps1 fake4 "$env:LOCALAPPDATA\Fake\tools\fake.exe" -nupkg fake -Version $FakeVersion -InstallDir $env:LOCALAPPDATA
    Use-Command.ps1 dot "$env:ChocolateyInstall\bin\dot.exe" -cinst graphviz
}
Process
{
    if($Format -eq 'gv') {fake4 -dg 2>&1 |Where-Object {$_ -match '^(digraph|  |})'} |Out-File $OutFile ascii}
    else {fake4 -dg 2>&1 |Where-Object {$_ -match '^(digraph|  |})'} |Out-String |& $Renderer "-T$Format" "-o$OutFile"}
}