Implement proxy support (configurable). Ref #86.

src/nimblepkg/config.nim

@@ -1,6 +1,6 @@
 # Copyright (C) Dominik Picheta. All rights reserved.
 # BSD License. Look at license.txt for more info.
-import parsecfg, streams, strutils, os, tables
+import parsecfg, streams, strutils, os, tables, Uri
 
 import tools, version, nimbletypes
 
@@ -10,6 +10,7 @@ type
     chcp*: bool # Whether to change the code page in .cmd files on Win.
     packageLists*: Table[string, PackageList] ## URLs to packages.json files
     cloneUsingHttps*: bool # Whether to replace git:// for https://
+    httpProxy*: Uri # Proxy for package list downloads.
 
   PackageList* = object
     name*: string
@@ -21,6 +22,8 @@ proc initConfig(): Config =
   else:
     result.nimbleDir = getHomeDir() / ".babel"
 
+  result.httpProxy = initUri()
+
   result.chcp = true
   result.cloneUsingHttps = true
 
@@ -83,6 +86,8 @@ proc parseConfig*(): Config =
           result.chcp = parseBool(e.value)
         of "cloneusinghttps":
           result.cloneUsingHttps = parseBool(e.value)
+        of "httpproxy":
+          result.httpProxy = parseUri(e.value)
         of "name":
           case currentSection.normalize
           of "packagelist":

src/nimblepkg/options.nim

@@ -1,7 +1,8 @@
 # Copyright (C) Dominik Picheta. All rights reserved.
 # BSD License. Look at license.txt for more info.
 
-import json, strutils, os, parseopt, strtabs
+import json, strutils, os, parseopt, strtabs, uri
+from httpclient import Proxy, newProxy
 
 import nimblepkg/config, nimblepkg/version,
        nimblepkg/tools
@@ -295,3 +296,22 @@ proc parseCmdLine*(): Options =
     # Rename deprecated babel dir.
     renameBabelToNimble(result)
 
+proc getProxy*(options: Options): Proxy =
+  ## Returns ``nil`` if no proxy is specified.
+  var url = initUri()
+  if ($options.config.httpProxy).len > 0:
+    url = options.config.httpProxy
+  else:
+    try:
+      if existsEnv("http_proxy"):
+        parseUri(getEnv("http_proxy"), url)
+      elif existsEnv("https_proxy"):
+        parseUri(getEnv("https_proxy"), url)
+    except ValueError:
+      echo("WARNING: Unable to parse proxy from environment: ",
+          getCurrentExceptionMsg())
+
+  if ($url).len > 0:
+    return newProxy($url, url.username & ":" & url.password)
+  else:
+    return nil