create: Fix getting name from GitHub archives

`brew create https://github.com/lapce/lapce/archive/v0.3.0.tar.gz` was
getting the wrong name 'v3.0.0' from the URL

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>

Library/Homebrew/dev-cmd/create.rb

@@ -172,13 +172,12 @@ module Homebrew
       fetch:   !args.no_fetch?,
       head:    args.HEAD?,
     )
-    if fc.name.blank?
-      stem = Pathname.new(args.named.first).stem.rpartition("=").last
-      print "Formula name [#{stem}]: "
-      fc.name = __gets || stem
-    end
-
     fc.parse_url
+    # ask for confirmation if name wasn't passed explicitly
+    if args.set_name.blank?
+      print "Formula name [#{fc.name}]: "
+      fc.name = __gets || fc.name
+    end
 
     fc.verify
 

Library/Homebrew/formula_creator.rb

@@ -31,25 +31,37 @@ module Homebrew
       raise TapUnavailableError, @tap.name unless @tap.installed?
     end
 
+    def self.name_from_url(url)
+      stem = Pathname.new(url).stem
+      # special cases first
+      if stem.start_with? "index.cgi"
+        # gitweb URLs e.g. http://www.codesrc.com/gitweb/index.cgi?p=libzipper.git;a=summary
+        stem.rpartition("=").last
+      elsif url =~ %r{github\.com/\S+/(\S+)/(archive|releases)/}
+        # e.g. https://github.com/stella-emu/stella/releases/download/6.7/stella-6.7-src.tar.xz
+        Regexp.last_match(1)
+      else
+        # e.g. http://digit-labs.org/files/tools/synscan/releases/synscan-5.02.tar.gz
+        pathver = Version.parse(stem).to_s
+        stem.sub(/[-_.]?#{Regexp.escape(pathver)}$/, "")
+      end
+    end
+
     def parse_url
-      path = Pathname.new(@url)
-      if @name.nil?
+      @name = FormulaCreator.name_from_url(@url) if @name.blank?
+      odebug "name_from_url: #{@name}"
+      @version = Version.detect(@url) if @version.nil?
+
       case @url
       when %r{github\.com/(\S+)/(\S+)\.git}
         @user = Regexp.last_match(1)
-          @name = Regexp.last_match(2)
         @head = true
         @github = true
       when %r{github\.com/(\S+)/(\S+)/(archive|releases)/}
         @user = Regexp.last_match(1)
-          @name = Regexp.last_match(2)
         @github = true
-        else
-          @name = path.basename.to_s[/(.*?)[-_.]?#{Regexp.escape(path.version.to_s)}/, 1]
       end
     end
-      @version = Version.detect(@url) if @version.nil?
-    end
 
     def write_formula!
       raise ArgumentError, "name is blank!" if @name.blank?

Library/Homebrew/test/formula_creator_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require "formula_creator"
+
+describe Homebrew::FormulaCreator do
+  it "gets name from GitHub archive URL" do
+    t = described_class.name_from_url("https://github.com/abitrolly/lapce/archive/v0.3.0.tar.gz")
+    expect(t).to eq("lapce")
+  end
+
+  it "gets name from gitweb URL" do
+    t = described_class.name_from_url("http://www.codesrc.com/gitweb/index.cgi?p=libzipper.git;a=summary")
+    expect(t).to eq("libzipper")
+  end
+
+  it "gets name from GitHub repo URL" do
+    t = described_class.name_from_url("https://github.com/abitrolly/lapce.git")
+    expect(t).to eq("lapce")
+  end
+
+  it "gets name from GitHub download URL" do
+    t = described_class.name_from_url("https://github.com/stella-emu/stella/releases/download/6.7/stella-6.7-src.tar.xz")
+    expect(t).to eq("stella")
+  end
+
+  it "gets name from generic tarball URL" do
+    t = described_class.name_from_url("http://digit-labs.org/files/tools/synscan/releases/synscan-5.02.tar.gz")
+    expect(t).to eq("synscan")
+  end
+end