PwSh.Fw.BuildHelpers.psm1

<#
.SYNOPSIS
Create a new project.yml file
 
.DESCRIPTION
Create an empty project.yml file at the location of your choice. Preferably in the root of your new project workspace.
 
.PARAMETER Path
Existing path to write project.yml file
 
.PARAMETER PassThru
If specified, return the content of the project object instead of the absolute location of the file
 
.EXAMPLE
$project = New-ProjectFile -PassThru
 
.NOTES
General notes
#>

function New-ProjectFile {
    [CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = 'Low')][OutputType([String], [boolean])]Param (
        [Parameter(Mandatory = $true, ValueFromPipeLine = $true)][string]$Path,
        [switch]$PassThru
    )
    Begin {
        # Write-EnterFunction
    }

    Process {
        $Project = [PSCustomObject]@{
            Name = "name"
            Version = "1.0.0"
            Authors = @("you")
            Owner = "you"
            LicenseURL = "https//path/to/your/licence/file"
            Description = "short description of your project"
            ReleaseNotes = ""
            Copyright = ""
            Depends = @()
        }

        If (Test-Path $Path) {
            if ($PSCmdlet.ShouldProcess("ShouldProcess?")) {
                $Project | ConvertTo-Yaml | Set-Content $Path/project.yml -Encoding utf8
            }
        } else {
            Write-Error "'$Path' not found."
            return $false
        }
        if ($PassThru) {
            return $Project
        } else {
            return (Resolve-Path "$Path/project.yml").Path
        }
    }

    End {
        # Write-LeaveFunction
    }
}

<#
.SYNOPSIS
Test if a project is compliant with BuildHelpers modules
 
.DESCRIPTION
Check the completeness of a project to be used with BuildHelpers modules.
 
.PARAMETER Path
The root path of the project to test
 
.EXAMPLE
Test-ProjectStructure -Path c:\projects\myNewProject
 
.NOTES
General notes
#>

function Test-ProjectStructure {
    [CmdletBinding()][OutputType([boolean])]Param (
        [Parameter(Mandatory = $true, ValueFromPipeLine = $true)][string]$Path
    )
    Begin {
        # Write-EnterFunction
    }

    Process {
        $rc = $true
        if (Test-Path $Path -PathType Container) {
            Write-Host -ForegroundColor Green "[+] $Path exist"
        } else {
            Write-Host -ForegroundColor Red "[-] $Path does not exist"
            $rc = $false
        }
        foreach ($f in @('project.yml', 'CHANGELOG.md', 'README.md', 'LICENSE', 'VERSION')) {
            if (Test-Path $Path/$f -PathType Leaf) {
                Write-Host -ForegroundColor Green "[+] $((Resolve-Path $Path/$f).Path) exist"
            } else {
                Write-Host -ForegroundColor Red "[-] $((Resolve-Path $Path/$f).Path) does not exist"
                $rc = $false
            }
        }

        return $rc
    }

    End {
        # Write-LeaveFunction
    }
}

<#
.SYNOPSIS
Get changelog in a object form
 
.DESCRIPTION
Slice CHANGELOG file and build a hashtable with each version of a changelog.
 
.PARAMETER Path
Path to the CHANGELOG file
 
.EXAMPLE
Get-ProjectChangelog -Path ./CHANGELOG.md
 
.NOTES
Each new version must follow the https://keepachangelog.com/ format. That is :
## [1.0.0]
If this pattern is not applied, please ask for a request, or fix your changelog format
 
#>

function Get-ProjectChangelog {
    [CmdletBinding()][OutputType([hashtable])]Param (
        [Parameter(Mandatory = $true, ValueFromPipeLine = $true)][string]$Path
    )
    Begin {
        Write-EnterFunction
        $TMP = [system.io.path]::GetTempPath()
    }

    Process {
        $h = @{}
        if (fileExist $Path) {
            # CHANGELOG is present
            $CHANGELOG = Resolve-Path $Path
            # parse CHANGELOG.md
            # below command line explained :
            # Get-Content $CHANGELOG | Select-String -NotMatch -Pattern '(?ms)^$' --> get CHANGELOG content without empty lines
            # -replace "^## ", "`n## " --> add empty lines only before h2 title level (## in markdown). This way, we got proper paragraph from ## tag to next empty line
            (Get-Content $CHANGELOG | Select-String -NotMatch -Pattern '(?ms)^$') -replace "^## ", "`n## " | Out-File $TMP/changelog.tmp
            # To extract correct §, we need to read the file with -Raw parameter
            # (?ms) sets regex options m (treats ^ and $ as line anchors) and s (makes . match \n (newlines) too`.
            # ^## .*? matches any line starting with ## and any subsequent characters *non-greedily* (non-greedy is '.*?' set of characters at the end of pattern).
            # -AllMatches to get... well... all mathes
            # [1] because the last changelog is allways [1] from array of matches. [0] is ## [Unreleased]
            $MESSAGES = Get-Content -Raw $TMP/changelog.tmp | Select-String -Pattern '(?ms)^## .*?^$' -AllMatches
            # edevel("MESSAGES = " + $MESSAGES.Matches[0])
            # reduce title level to render more readable in github release page
            # $MESSAGE = ($MESSAGES.Matches[0]) -replace "# ", "## " -replace "'", "``" -replace "unreleased", "$VERSION"
            # Write-Debug "MESSAGE = $MESSAGE"
            foreach ($msg in $MESSAGES.Matches) {
                if ($msg.value -match "^## \[(.*)\]") {
                    $version = $Matches[1]
                    $h.Add($version, $msg.Value)
                }
            }
        } else {
            eerror "Changelog file at '$Path' not found. See https://keepachangelog.com/en/1.0.0/ to begin."
            return $null
        }
        return $h
    }

    End {
        Write-LeaveFunction
    }
}

<#
.SYNOPSIS
Load project data into an object
 
.DESCRIPTION
Load static and dynamic data from project.yml but also from VERSION and CHANGELOG files
 
.PARAMETER Path
Path to the project
 
.EXAMPLE
Get-Project -Path /my/awsome/project
 
.NOTES
General notes
#>

function Get-Project {
    [CmdletBinding()][OutputType([Object])]Param (
        [Parameter(Mandatory = $true, ValueFromPipeLine = $true)][string]$Path
    )
    Begin {
        Write-EnterFunction
    }

    Process {
        if ((Test-ProjectStructure -Path $Path) -eq $false) {
            return $null
        }
        # compute BUILD number and BRANCH name
        $BUILD = 0
        $BRANCH = "develop"
        # APPVEYOR: honor appveyor build number
        if ($null -ne $env:APPVEYOR_BUILD_NUMBER) { $BUILD = $env:APPVEYOR_BUILD_NUMBER}
        if ($null -ne $env:APPVEYOR_REPO_BRANCH) { $BRANCH = $env:APPVEYOR_REPO_BRANCH}
        # TRAVIS: honor travis-ci build number
        if ($null -ne $env:TRAVIS_BUILD_NUMBER) { $BUILD = $env:TRAVIS_BUILD_NUMBER}
        if ($null -ne $env:TRAVIS_BRANCH) { $BRANCH = $env:TRAVIS_BRANCH}
        # GITLAB: honor gitlab-ci pipeline project's build number
        if ($null -ne $env:CI_PIPELINE_IID) { $BUILD = $env:CI_PIPELINE_IID}
        if ($null -ne $env:CI_COMMIT_BRANCH) { $BRANCH = $env:CI_COMMIT_BRANCH }

        # get project from project.yml
        $project = Get-Content $Path/project.yml -Raw | ConvertFrom-Yaml

        # compute Version :
        # master branch is x.y.z.#
        # other branches are x.y.z-pre#
        if ($BRANCH -eq "master") {
            $project.version = "$(Get-Content $Path/VERSION).$($BUILD)"
            $project.PreRelease = ""
        } else {
            $project.Version = (Get-Content $Path/VERSION)
            if ($BUILD -lt 10) {
                $project.PreRelease = "-pre0$($BUILD)"
            } else {
                $project.PreRelease = "-pre$($BUILD)"
            }
        }

        # fill releasenotes with changelog
        $changelog = Get-ProjectChangelog -Path $Path/CHANGELOG.md
        if ($changelog.ContainsKey($project.version)) {
            $project.releasenotes = $changelog[$project.version]
        } elseif ($changelog.ContainsKey("unreleased")) {
            $project.releasenotes = $changelog["unreleased"]
        }
        return $project
    }

    End {
        Write-LeaveFunction
    }
}