Add Julia 1.3.1

images/win/scripts/Installers/Install-Julia.ps1

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+################################################################################
+##  File:  Install-Julia.ps1
+##  Desc:  Install Julia
+################################################################################
+
+Import-Module -Name ImageHelpers -Force
+function Install-JuliaVersion
+{
+    Param
+    (
+        [String]$juliaVersion,
+        [Switch]$addToDefaultPath
+    )
+
+    # Split versions.
+    $juliaMajorVersion = $juliaVersion.split(".")[0] + "." + $juliaVersion.split(".")[1]
+
+    # Download the Julia installer.
+    Write-Host "Downloading Julia $juliaVersion..."
+    $ProgressPreference = 'SilentlyContinue'
+    Invoke-WebRequest -UseBasicParsing -Uri "https://julialang-s3.julialang.org/bin/winnt/x64/$juliaMajorVersion/julia-$juliaVersion-win64.exe" -OutFile "julia-$juliaVersion-win64.exe"
+
+    # Install Julia.
+    # The installer will change in Julia 1.4. For future-proofing, a version check is run.
+    if ( $juliaMajorVersion -ge "1.4")
+    {
+        Start-Process -FilePath "julia-$juliaVersion-win64.exe" -ArgumentList "/SILENT /dir=C:\Julia" -NoNewWindow -Wait
+    }
+    else
+    {
+        Start-Process -FilePath "julia-$juliaVersion-win64.exe" -ArgumentList "/S /D=C:\Julia" -NoNewWindow -Wait
+    }
+
+    # Delete unnecessary files to conserve space.
+    Write-Host "Deleting downloaded installer..."
+    Remove-Item "julia-$juliaVersion-win64.exe"
+
+    # Make this the default version of Julia?
+    if ($addToDefaultPath)
+    {
+        Write-Host "Adding Julia $juliaVersion to the path..."
+        # Add the Julia binaries to the path.
+        Add-MachinePathItem "C:\Julia\Julia-$juliaVersion\bin" | Out-Null
+    }
+
+    # Done
+    Write-Host "Done installing Julia $juliaVersion."
+    return "C:\Julia\Julia-$juliaVersion"
+}
+
+# Install Julia
+$juliaVersionsToInstall = $env:JULIA_VERSIONS.split(",")
+
+foreach($julia in $juliaVersionsToInstall) {
+    Write-Host "Installing Julia ${julia}"
+    if($julia -eq $env:JULIA_DEFAULT) {
+        $installDirectory = Install-JuliaVersion -juliaVersion $julia -addToDefaultPath
+    } else {
+        $installDirectory = Install-JuliaVersion -juliaVersion $julia
+    }
+    setx $envName "$installDirectory" /M
+}

images/win/scripts/Installers/Validate-Julia.ps1

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+################################################################################
+##  File:  Validate-Julia.ps1
+##  Desc:  Validate Julia
+################################################################################
+
+# Verify that julia.exe is on the path
+if(Get-Command -Name 'julia')
+{
+    Write-Host "$(julia --version) is on the path."
+}
+else
+{
+    Write-Host "Julia is not on the path."
+    exit 1
+}
+
+# Add details of available versions in Markdown
+$tmplMark = @"
+#### {0}
+
+_Environment:_
+* {1}: root directory of the Julia {0} installation
+
+"@
+
+$tmplMarkRoot = @"
+#### {0}
+
+_Environment:_
+* PATH: contains the location of julia.exe version {0}
+* {1}: root directory of the Julia {0} installation
+"@
+
+$SoftwareName = "Julia (x64)"
+$Description = New-Object System.Text.StringBuilder
+$juliaVersionsToInstall = $env:JULIA_VERSIONS.split(",")
+
+foreach($julia in $juliaVersionsToInstall) {
+    $juliaVersion = Get-JuliaVersion
+    if ($juliaVersion -eq $julia) {
+        if($julia -eq $env:JULIA_DEFAULT) {
+            $null = $Description.AppendLine(($tmplMarkRoot -f $juliaVersion))
+        } else {
+            $null = $Description.AppendLine(($tmplMark -f $juliaVersion))
+        }
+    }
+}
+
+Add-SoftwareDetailsToMarkdown -SoftwareName $SoftwareName -DescriptionMarkdown $Description.ToString()