Altered behavior further to lean towards giving the developer more power over the end user

Specifically:
- PAGER environment variable is not used by default to set cmd2.Cmd.pager
    - This is done to ensure a consistent behavior of cmd2 applications across users by default

Developers are free to set pager and pager_chop in the __init__() for their class derived from cmd2.Cmd differently to ensure whatever behavior they desire.

Also:
- Updated the paged_output.py example to demonstrate using ppaged() with both wrapped and chopped/truncated text

1 files changed, 30 insertions, 12 deletions

diff --git a/examples/paged_output.py b/examples/paged_output.py
index 72efd4f5..d1b1b2c2 100755
--- a/examples/paged_output.py
+++ b/examples/paged_output.py
@@ -14,25 +14,43 @@ class PagedOutput(cmd2.Cmd):
     def __init__(self):
         super().__init__()
 
+    def page_file(self, file_path: str, chop: bool=False):
+        """Helper method to prevent having too much duplicated code."""
+        filename = os.path.expanduser(file_path)
+        try:
+            with open(filename, 'r') as f:
+                text = f.read()
+            self.ppaged(text, chop=chop)
+        except FileNotFoundError as ex:
+            self.perror('ERROR: file {!r} not found'.format(filename), traceback_war=False)
+
     @cmd2.with_argument_list
-    def do_page_file(self, args: List[str]):
-        """Read in a text file and display its output in a pager.
+    def do_page_wrap(self, args: List[str]):
+        """Read in a text file and display its output in a pager, wrapping long lines if they don't fit.
 
-        Usage: page_file <file_path>
+        Usage: page_wrap <file_path>
         """
         if not args:
-            self.perror('page_file requires a path to a file as an argument', traceback_war=False)
+            self.perror('page_wrap requires a path to a file as an argument', traceback_war=False)
             return
+        self.page_file(args[0], chop=False)
 
-        filename = os.path.expanduser(args[0])
-        try:
-            with open(filename, 'r') as f:
-                text = f.read()
-            self.ppaged(text)
-        except FileNotFoundError as ex:
-            self.perror('ERROR: file {!r} not found'.format(filename), traceback_war=False)
+    complete_page_wrap = cmd2.Cmd.path_complete
+
+    @cmd2.with_argument_list
+    def do_page_truncate(self, args: List[str]):
+        """Read in a text file and display its output in a pager, truncating long lines if they don't fit.
+
+        Truncated lines can still be accessed by scrolling to the right using the arrow keys.
+
+        Usage: page_chop <file_path>
+        """
+        if not args:
+            self.perror('page_truncate requires a path to a file as an argument', traceback_war=False)
+            return
+        self.page_file(args[0], chop=True)
 
-    complete_page_file = cmd2.Cmd.path_complete
+    complete_page_truncate = cmd2.Cmd.path_complete
 
 
 if __name__ == '__main__':