Add argument split_lines for when you just want the whole text.

Calling '\n'.join(pipeable.input()) is not great because in many
situations, you're splitting text and joining it back together again
for no reason. With this option, we can let the code do the right
thing, and use pipeable as a general-purpose inputter in
more situations.

voussoirkit/pipeable.py

@@ -95,19 +95,19 @@ def input(
         input_prompt=None,
         read_files=False,
         skip_blank=False,
+        split_lines=True,
         strip=False,
     ):
     '''
-    Given an argument (probably from the command line), resolve it into a
-    generator of lines.
+    Given an argument (probably from the command line), resolve it into an
+    iterable of lines if split_lines is True, or return the whole text.
 
-    If the arg is in CLIPBOARD_STRINGS, the contents of the clipboard are taken
-    and split into lines.
+    If the arg is in CLIPBOARD_STRINGS, the contents of the clipboard are taken.
     If the arg is in INPUT_STRINGS, input is read from stdin with an optional
-    input_prompt that is only shown during non-pipe input (actual typing).
+    input_prompt. The prompt is only shown during non-pipe input (typing).
     If read_files is True and the arg is the path to an existing file, the file
-    is read as utf-8 lines.
-    If none of the above, then the argument is taken literally.
+    is read as utf-8 text.
+    If none of the above, then the argument string is taken literally.
 
     Resolution is not recursive: if the clipboard contains the name of a file,
     it won't be read, etc.
@@ -117,7 +117,7 @@ def input(
     strip is False, then all-whitespace lines will still be yielded). If you're
     modifying input but overall maintaining its original structure, you probably
     want these both False. If you're just crunching numbers you probably want
-    them both True.
+    them both True. If split_lines is False then these are not relevant.
 
     So, your calling code should not have to make any adjustments -- just call
     this function however is appropriate for your data sink and enjoy.
@@ -129,24 +129,35 @@ def input(
 
     if arg_lower in INPUT_STRINGS:
         lines = multi_line_input(prompt=input_prompt)
+        if not split_lines:
+            text = '\n'.join(lines)
 
     elif arg_lower in CLIPBOARD_STRINGS:
         import pyperclip
-        lines = pyperclip.paste().splitlines()
+        text = pyperclip.paste()
+        if split_lines:
+            lines = text.splitlines()
 
     elif read_files and os.path.isfile(arg):
-        lines = open(arg, 'r', encoding='utf-8')
-        lines = (line.rstrip('\r\n') for line in lines)
+        with open(arg, 'r', encoding='utf-8') as handle:
+            text = handle.read()
+        if split_lines:
+            lines = text.splitlines()
 
     else:
-        lines = arg.splitlines()
+        text = arg
+        if split_lines:
+            lines = text.splitlines()
 
-    for line in lines:
-        if strip:
-            line = line.strip()
-        if skip_blank and not line:
-            continue
-        yield line
+    if not split_lines:
+        return text
+
+    if strip:
+        lines = (line.strip() for line in lines)
+    if skip_blank:
+        lines = (line for line in lines if line)
+
+    return lines
 
 def input_many(args, *input_args, **input_kwargs):
     '''