First draft of new build script

scripts/build.ps1

@@ -0,0 +1,52 @@
+<#
+    Samuel Vasko
+    Part of Cmder project
+    This script builds dependencies from current vendor/sources.json
+    file and unpacks them.
+#>
+
+# Configs
+$sourcesPath = "..\vendor\sources.json"
+$saveTo = "..\vendor\"
+# -------
+
+# Check for requirements
+Ensure-Exists $sourcesPath
+Ensure-Executable "7z"
+
+$sources = Get-Content $sourcesPath | ConvertTo-Json
+
+foreach ($s in $sources) {
+    $ext = $s.url.Split('.')[-1]
+    Delete-Existing $saveTo + $($s.name)
+    Delete-Existing $saveTo + $($s.name) + "." + $ext
+
+    Write-Host "-- Downloading $($s.name) --"
+    New-Object System.Net.WebClient
+    $wc.DownloadFile($s.url, "..\vendor\" + $s.name + "." + $ext)
+    Invoke-Item "7z x " + $s.name + "." + $ex
+    if ($LastExitCode != 0) {
+        Write-Error "Failied to extract " + $s.name;
+        exit 1
+    }
+}
+
+Write-Host "All good and done!"
+
+function Ensure-Exists ($item) {
+    if (!Test-Path $item) {
+        Write-Error "Missing required $($item) file"
+        exit 1
+    }
+}
+
+function Delete-Existing ($item) {
+    if (Test-Path $item) { Remove-Item $item }
+}
+
+function Ensure-Executable ($command) {
+    if (!Get-Command $command) {
+       Write-Error "Missing $($command)! Ensure it is installed and on in the PATH"
+       exit 1
+    }
+}