Improve CLI args (#21)

* improve cli commands

* bump version

* add test

dis_cli.py

@@ -62,6 +62,7 @@
 @click.option(
     "-p/-P",
     "--paging/--no-paging",
+    "--pager/--no-pager",
     default=None,
     help="Enable/disable displaying output using the system pager. Default: enabled if the output is taller than your terminal window.",
 )
@@ -79,6 +80,11 @@ def cli(
 
     Any number of TARGETs may be passed; they will be displayed sequentially.
     """
+    if len(target) == 0:
+        ctx = click.get_current_context()
+        click.echo(ctx.get_help())
+        return
+
     # Make sure the cwd (implicit starting point for the import path) is actually on PYTHONPATH.
     # Since Python automatically adds the cwd on startup, this is only really necessary in the test suite,
     # but it's convenient to do it here for sanity.

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = dis_cli
-version = 0.2.0
+version = 0.2.1
 description = A tool to inspect disassembled Python code on the command line.
 long_description = file: README.md
 long_description_content_type = text/markdown

tests/test_cli.py

@@ -219,3 +219,10 @@ def test_column_width(terminal_width, line_num_width, ratio, expected):
         calculate_column_widths(line_num_width, ratio=ratio, terminal_width=terminal_width)
         == expected
     )
+
+
+def test_no_targets_prints_help(cli):
+    result = cli([])
+
+    assert result.exit_code == 0
+    assert "TARGET" in result.output