devtool / recipetool: use common code for launching editor

Looking at Chris Larson's code for starting the user's editor for
"recipetool newappend" it was slightly better than what I wrote for
"devtool edit-recipe" in that it checks VISUAL as well as EDITOR and
defaults to vi if neither are set, so break this out to its own function
and call it from both places. The broken out version passes shell=True
however in case it's a more complicated command rather than just a name
of an executable.

(From OE-Core rev: 184a256931e8cdc7bea97a905c4e67a435964de0)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/devtool/utilcmds.py

@@ -24,6 +24,7 @@ import tempfile
 import logging
 import argparse
 import subprocess
+import scriptutils
 from devtool import exec_build_env_command, setup_tinfoil, check_workspace_recipe, DevtoolError
 from devtool import parse_recipe
 
@@ -48,17 +49,7 @@ def edit_recipe(args, config, basepath, workspace):
             raise DevtoolError("Recipe file for %s is not under the workspace" %
                                args.recipename)
 
-    editor = os.environ.get('EDITOR', None)
-    if not editor:
-        raise DevtoolError("EDITOR environment variable not set")
-
-    import subprocess
-    try:
-        subprocess.check_call('%s "%s"' % (editor, recipefile), shell=True)
-    except subprocess.CalledProcessError as e:
-        return e.returncode
-
-    return 0
+    return scriptutils.run_editor(recipefile)
 
 
 def configure_help(args, config, basepath, workspace):