Add demo and command dump

README.rst

@@ -16,6 +16,13 @@ subprocesses at the same time. The purpose of this library is to:
 
 This code was copy/pasted between projects and finally extracted on its own.
 
+Demo
+====
+
+.. image:: https://yourlabs.io/oss/shlax/-/raw/master/demo.png
+
+You will find the demo script in demo.py in this repository.
+
 Usage
 =====
 
@@ -96,8 +103,9 @@ will be applied line by line:
 Where is the rest?
 ==================
 
-Shlax used to be the name of a much more ambitious poc-project that has been
-extracted in two projects with clear boundaries, namely `sysplan
+Shlax used to be the name of a much more ambitious poc-project, that you can
+still find in the ``OLD`` branch of this repository. It has been extracted in
+two projects with clear boundaries, namely `sysplan
 <https://yourlabs.io/oss/sysplan>`_ and `podplan
-<https://yourlabs.io/oss/podplan>`_ which are still in alpha state, but Shlax
-as it is feature complete and stable.
+<https://yourlabs.io/oss/podplan>`_ which are still in alpha state, although
+Shlax as it is feature complete and stable.

demo.py

+import asyncio
+
+from shlax import Subprocess
+
+
+async def main():
+    colors = {
+        '^(.*).txt$': '{green}\\1.txt',
+        '^(.*).py$': '{bred}\\1.py',
+    }
+    await asyncio.gather(
+        Subprocess(
+            'for i in $(find .. | head); do echo $i; sleep .2; done',
+            regexps=colors,
+            prefix='parent',
+        ).wait(),
+        Subprocess(
+            'for i in $(find . | head); do echo $i; sleep .3; done',
+            regexps=colors,
+            prefix='cwd',
+        ).wait(),
+    )
+
+asyncio.run(main())

shlax/subprocess.py

 import asyncio
 import functools
 import re
+import shlex
 import sys
 
 from .colors import colors
@@ -54,7 +55,6 @@ class Subprocess:
         if len(args) == 1 and ' ' in args[0]:
             args = ['sh', '-euc', args[0]]
 
-        self.cmd = ' '.join(args)
         self.args = args
         self.quiet = quiet if quiet is not None else False
         self.prefix = prefix
@@ -75,6 +75,18 @@ class Subprocess:
                 self.regexps[search] = replace
 
     async def start(self, wait=True):
+        if not self.quiet:
+            self.output(
+                self.colors.bgray.encode()
+                + b'+ '
+                + shlex.join([
+                    arg.replace('\n', '\\n')
+                    for arg in self.args
+                ]).encode()
+                + self.colors.reset.encode(),
+                highlight=False
+            )
+
         # Get a reference to the event loop as we plan to use
         # low-level APIs.
         loop = asyncio.get_running_loop()

tests/test_proc.py

@@ -37,12 +37,10 @@ async def test_wait_unbound():
 async def test_rc_1():
     proc = await Proc(
         'NON EXISTING COMMAND',
-        write=Mock(),
+        quiet=True,
     ).wait()
     assert proc.rc != 0
-    proc.write.assert_called_once_with(
-        b'sh: line 1: NON: command not found\x1b[0m\n'
-    )
+    assert proc.err == 'sh: line 1: NON: command not found'
 
 
 @pytest.mark.asyncio
@@ -70,6 +68,16 @@ async def test_prefix():
     ).wait()
 
     assert write.mock_calls == [
+        call(
+            Proc.prefix_colors[0].encode()
+            + b'test_prefix '
+            + Proc.colors.reset.encode()
+            + b'| '
+            + Proc.colors.bgray.encode()
+            + b'+ sh -euc \'echo hi\''
+            + Proc.colors.reset.encode()
+            + b'\n'
+        ),
         call(
             Proc.prefix_colors[0].encode()
             + b'test_prefix '
@@ -78,6 +86,16 @@ async def test_prefix():
             + Proc.colors.reset.encode()
             + b'\n'
         ),
+        call(
+            Proc.prefix_colors[1].encode()
+            + b'test_prefix_1 '
+            + Proc.colors.reset.encode()
+            + b'| '
+            + Proc.colors.bgray.encode()
+            + b'+ sh -euc \'echo hi\''
+            + Proc.colors.reset.encode()
+            + b'\n'
+        ),
         call(
             Proc.prefix_colors[1].encode()
             # padding has been added because of output1
@@ -87,6 +105,17 @@ async def test_prefix():
             + Proc.colors.reset.encode()
             + b'\n'
         ),
+        call(
+            Proc.prefix_colors[0].encode()
+            # padding has been added because of output1
+            + b'  test_prefix '
+            + Proc.colors.reset.encode()
+            + b'| '
+            + Proc.colors.bgray.encode()
+            + b'+ sh -euc \'echo hi\''
+            + Proc.colors.reset.encode()
+            + b'\n'
+        ),
         call(
             Proc.prefix_colors[0].encode()
             # padding has been added because of output1
@@ -108,6 +137,16 @@ async def test_prefix_multiline():
         prefix='test_prefix',
     ).wait()
     assert proc.write.mock_calls == [
+        call(
+            Proc.prefix_colors[0].encode()
+            + b'test_prefix '
+            + Proc.colors.reset.encode()
+            + b'| '
+            + Proc.colors.bgray.encode()
+            + b'+ sh -euc \'echo -e "a\\nb"\''
+            + Proc.colors.reset.encode()
+            + b'\n'
+        ),
         call(
             Proc.prefix_colors[0].encode()
             + b'test_prefix '
@@ -140,7 +179,7 @@ async def test_highlight():
             r'h([\w\d-]+)': 'h{cyan}\\1',
         }
     ).wait()
-    proc.write.assert_called_once_with(b'h\x1b[38;5;51mi\x1b[0m\n')
+    proc.write.assert_called_with(b'h\x1b[38;5;51mi\x1b[0m\n')
 
 
 @pytest.mark.asyncio
@@ -155,4 +194,4 @@ async def test_highlight_if_not_colored():
             r'h([\w\d-]+)': 'h{cyan}\\1',
         }
     ).wait()
-    proc.write.assert_called_once_with(b'h\x1b[31mi\n')
+    proc.write.assert_called_with(b'h\x1b[31mi\n')