Move decision logic about windows/header generation closer to install_scripts,...

Move decision logic about windows/header generation closer to install_scripts, as it doesn't appear to be used elsewhere.

setuptools/command/easy_install.py

@@ -745,7 +745,7 @@ Please make the appropriate changes for your system and try again.
 
     def install_wrapper_scripts(self, dist):
         if not self.exclude_scripts:
-            for args in get_script_args(dist):
+            for args in ScriptWriter._gen_args(dist):
                 self.write_script(*args)
 
     def install_script(self, dist, script_name, script_text, dev_path=None):
@@ -921,7 +921,7 @@ Please make the appropriate changes for your system and try again.
         # delete entry-point scripts to avoid duping
         self.delete_blockers(
             [os.path.join(script_dir, args[0]) for args in
-             get_script_args(dist)]
+             ScriptWriter._gen_args(dist)]
         )
         # Build .egg file from tmpdir
         bdist_egg.make_zipfile(
@@ -1902,15 +1902,18 @@ class ScriptWriter(object):
 
     @classmethod
     def get_script_args(cls, dist, executable=sys_executable, wininst=False):
-        """
-        Yield write_script() argument tuples for a distribution's entrypoints
-        """
+        # for backward compatibility
         writer = cls.get_writer(wininst)
         header = get_script_header("", executable, wininst)
         return writer._gen_args(dist, header)
 
     @classmethod
-    def _gen_args(cls, dist, header):
+    def _gen_args(cls, dist, header=None):
+        """
+        Yield write_script() argument tuples for a distribution's entrypoints
+        """
+        if header is None:
+            header = get_script_header("", sys_executable)
         spec = str(dist.as_requirement())
         for type_ in 'console', 'gui':
             group = type_ + '_scripts'

setuptools/command/install_scripts.py

@@ -13,9 +13,9 @@ class install_scripts(orig.install_scripts):
         self.no_ep = False
 
     def run(self):
-        from setuptools.command.easy_install import get_script_args
-        from setuptools.command.easy_install import sys_executable
-
+        from setuptools.command.easy_install import (
+            ScriptWriter, sys_executable, get_script_header,
+        )
         self.run_command("egg_info")
         if self.distribution.scripts:
             orig.install_scripts.run(self)  # run first to set up self.outfiles
@@ -35,7 +35,9 @@ class install_scripts(orig.install_scripts):
         is_wininst = getattr(
             self.get_finalized_command("bdist_wininst"), '_is_running', False
         )
-        for args in get_script_args(dist, executable, is_wininst):
+        writer = ScriptWriter.get_writer(force_windows=is_wininst)
+        header = get_script_header("", executable, wininst=is_wininst)
+        for args in writer._gen_args(dist, header):
             self.write_script(*args)
 
     def write_script(self, script_name, contents, mode="t", *ignored):

setuptools/tests/test_easy_install.py

@@ -22,8 +22,8 @@ from setuptools import compat
 from setuptools.compat import StringIO, BytesIO, urlparse
 from setuptools.sandbox import run_setup, SandboxViolation
 from setuptools.command.easy_install import (
-    easy_install, fix_jython_executable, get_script_args, nt_quote_arg,
-    get_script_header, is_sh,
+    easy_install, fix_jython_executable, nt_quote_arg,
+    get_script_header, is_sh, ScriptWriter,
 )
 from setuptools.command.easy_install import PthDistributions
 from setuptools.command import easy_install as easy_install_pkg
@@ -83,7 +83,7 @@ class TestEasyInstallTest:
     def test_get_script_args(self):
         dist = FakeDist()
 
-        args = next(get_script_args(dist))
+        args = next(ScriptWriter._gen_args(dist))
         name, script = itertools.islice(args, 2)
 
         assert script == WANTED