Merge pull request #222 from ngavalas/non-interactive

add a command-line flag to force non-interactive mode

Author: pcottle

fpp

@@ -21,6 +21,7 @@ done
 BASEDIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
 
 PYTHONCMD="python"
+NONINTERACTIVE=false
 
 function doProgram {
   # process input from pipe and store as pickled file
@@ -34,7 +35,7 @@ function doProgram {
   $PYTHONCMD "$BASEDIR/src/choose.py" "$@" < /dev/tty
   # Determine if running from within vim shell
   IFLAG=""
-  if [ -z "$VIMRUNTIME" ]; then
+  if [ -z "$VIMRUNTIME" -a "$NONINTERACTIVE" = false ]; then
     IFLAG="-i"
   fi
   # execute the output bash script. For zsh or bash
@@ -67,6 +68,8 @@ for opt in "$@"; do
     exit 0
   elif [ "$opt" == "--record" -o "$opt" == "-r" ]; then
     echo "Recording input and output..."
+  elif [ "$opt" == "--non-interactive" -o "$opt" == "-ni" ]; then
+    NONINTERACTIVE=true
   elif [ "$opt" == "--keep-open" -o "$opt" == "-ko" ]; then
     # allow control-c to exit the loop
     # http://unix.stackexchange.com/a/48432

src/screenFlags.py

@@ -45,6 +45,9 @@ def getDisableFileChecks(self):
     def getAllInput(self):
         return self.args.all_input
 
+    def getIsNonInteractive(self):
+        return self.args.non_interactive
+
     @staticmethod
     def getArgParser():
         parser = argparse.ArgumentParser(prog='fpp')
@@ -102,6 +105,16 @@ def getArgParser():
                             help='''You may force PathPicker to recognize all
 lines as acceptible input. Typically, PathPicker will scan the input for references
 to file paths. Passing this option will disable those scans and the program will assume that every input line is a match. In practice, this option allows for input selection for a variety of sources that would otherwise be unsupported -- git branches, mercurial bookmarks, etc.''')
+        parser.add_argument('-ni',
+                            '--non-interactive',
+                            default=False,
+                            action="store_true",
+                            help='''Normally, the command that runs after you've
+chosen files to operate on is spawned in an interactive subshell.  This allows you
+to use aliases and have access to environment variables defined in your startup
+files, but can have strange side-effects when starting and stopping jobs
+and redirecting inputs.  Using this flag runs your commands in a non-interactive subshell,
+like a normal shell script.''')
         return parser
 
     @staticmethod