[emrun] Simplify which helper. NFC

Author: sbc100

emrun.py

@@ -1144,19 +1144,15 @@ def is_exe(fpath):
     if is_exe(program):
       return program
   else:
-    for path in os.environ["PATH"].split(os.pathsep):
+    exe_suffixes = ['']
+    if WINDOWS and '.' not in fname:
+      exe_suffixes = ['.exe', '.cmd', '.bat']
+    for path in os.environ['PATH'].split(os.pathsep):
       path = path.strip('"')
       exe_file = os.path.join(path, program)
-      if is_exe(exe_file):
-        return exe_file
-
-      if WINDOWS and '.' not in fname:
-        if is_exe(exe_file + '.exe'):
-          return exe_file + '.exe'
-        if is_exe(exe_file + '.cmd'):
-          return exe_file + '.cmd'
-        if is_exe(exe_file + '.bat'):
-          return exe_file + '.bat'
+      for ext in exe_suffixes:
+        if is_exe(exe_file + ext):
+          return exe_file + ext
 
   return None
 
@@ -1192,17 +1188,8 @@ def find_browser(name):
   if MACOS and name == 'open':
     return [name]
 
-  if os.path.isfile(os.path.abspath(name)):
-    return [name]
-  if os.path.isfile(os.path.abspath(name) + '.exe'):
-    return [os.path.abspath(name) + '.exe']
-  if os.path.isfile(os.path.abspath(name) + '.cmd'):
-    return [os.path.abspath(name) + '.cmd']
-  if os.path.isfile(os.path.abspath(name) + '.bat'):
-    return [os.path.abspath(name) + '.bat']
-
   path_lookup = which(name)
-  if path_lookup is not None:
+  if path_lookup:
     return [path_lookup]
 
   browser_locations = []
@@ -1246,7 +1233,7 @@ def find_browser(name):
 
   for alias, browser_exe in browser_locations:
     if name == alias:
-      if browser_exe is not None and os.path.isfile(browser_exe):
+      if browser_exe and os.path.isfile(browser_exe):
         return [browser_exe]
 
   return None # Could not find the browser