re-enabled ~ support in path resolver (#538)

Co-authored-by: Johannes Müller <[email protected]>

spec/integration/install_spec.cr

@@ -923,6 +923,14 @@ describe "install" do
     end
   end
 
+  it "expands path and shows in debug info if missing" do
+    metadata = {dependencies: {nonexistent: {path: "~/nonexistent-path"}}}
+    with_shard(metadata) do
+      ex = expect_raises(FailedCommand) { run "shards install --no-color -v" }
+      ex.stdout.should contain(%(E: Failed no such path: #{Path.home.join("nonexistent-path")}))
+    end
+  end
+
   it "install dependency with no shard.yml and show warning" do
     metadata = {dependencies: {noshardyml: "0.1.0"}}
     with_shard(metadata) do

src/resolvers/path.cr

@@ -7,7 +7,7 @@ module Shards
     end
 
     def read_spec(version = nil) : String?
-      spec_path = File.join(local_path, SPEC_FILENAME)
+      spec_path = File.join(expanded_local_path, SPEC_FILENAME)
 
       if File.exists?(spec_path)
         File.read(spec_path)
@@ -29,7 +29,7 @@ module Shards
     end
 
     private def expanded_local_path
-      File.expand_path(local_path).tap do |path|
+      File.expand_path(local_path, home: true).tap do |path|
         raise Error.new("Failed no such path: #{path}") unless Dir.exists?(path)
       end
     end