finish tool can use 'nimgrab' tool to download the mingw version

compiler/installer.ini

@@ -91,10 +91,11 @@ Files: "bin/nimgrep.exe"
 Files: "bin/nimsuggest.exe"
 Files: "bin/nimble.exe"
 Files: "bin/vccexe.exe"
+Files: "bin/nimgrab.exe"
 
 Files: "koch.exe"
 Files: "finish.exe"
-Files: "bin/downloader.exe"
+; Files: "bin/downloader.exe"
 
 ; Files: "dist/mingw"
 Files: r"tools\start.bat"

koch.nim

@@ -223,7 +223,9 @@ proc bundleWinTools() =
   copyExe("tools/finish".exe, "finish".exe)
   removeFile("tools/finish".exe)
   nimexec("c -o:bin/vccexe.exe tools/vccenv/vccexe")
+  nimexec("c -o:bin/nimgrab.exe -d:ssl tools/nimgrab.nim")
   when false:
+    # not yet a tool worth including
     nimexec(r"c --cc:vcc --app:gui -o:bin\downloader.exe -d:ssl --noNimblePath " &
             r"--path:..\ui tools\downloader.nim")
 
@@ -541,6 +543,7 @@ of cmdArgument:
   of "test", "tests": tests(op.cmdLineRest)
   of "temp": temp(op.cmdLineRest)
   of "winrelease": winRelease()
+  of "wintools": bundleWinTools()
   of "nimble": buildNimble(existsDir(".git"))
   of "nimsuggest": bundleNimsuggest(buildExe=true)
   of "tools": buildTools(existsDir(".git"))

tools/finish.nim

@@ -30,8 +30,12 @@ proc unzip(): bool =
 
 proc downloadMingw(): DownloadResult =
   let curl = findExe"curl"
+  var cmd: string
   if curl.len > 0:
-    let cmd = curl & " --out " & "dist" / mingw & " " & url
+    cmd = curl & " --out " & "dist" / mingw & " " & url
+  elif fileExists"bin/nimgrab.exe":
+    cmd = "bin/nimgrab.exe " & url & " dist" / mingw
+  if cmd.len > 0:
     if execShellCmd(cmd) != 0:
       echo "download failed! ", cmd
       openDefaultBrowser(url)

tools/nimgrab.nim

@@ -0,0 +1,17 @@
+
+import os, asyncdispatch, httpclient
+
+proc syncDownload(url, file: string) =
+  var client = newHttpClient()
+  proc onProgressChanged(total, progress, speed: BiggestInt) =
+    echo "Downloading " & url & " " & $(speed div 1000) & "kb/s"
+    echo clamp(int(progress*100 div total), 0, 100), "%"
+
+  client.onProgressChanged = onProgressChanged
+  client.downloadFile(url, file)
+  echo "100%"
+
+if os.paramCount() != 2:
+  quit "Usage: nimgrab <url> <file>"
+else:
+  syncDownload(os.paramStr(1), os.paramStr(2))