Issue22642 - Convert trace module's option handling mechanism from getopt to argparse.

Patch contributed by SilentGhost.

Lib/test/test_trace.py

 import os
 import sys
 from test.support import TESTFN, rmtree, unlink, captured_stdout
+from test.support.script_helper import assert_python_ok, assert_python_failure
 import unittest
 
 import trace
@@ -364,6 +365,27 @@ class Test_Ignore(unittest.TestCase):
         # Matched before.
         self.assertTrue(ignore.names(jn('bar', 'baz.py'), 'baz'))
 
+class TestCommandLine(unittest.TestCase):
+
+    def test_failures(self):
+        _errors = (
+            (b'filename is missing: required with the main options', '-l', '-T'),
+            (b'cannot specify both --listfuncs and (--trace or --count)', '-lc'),
+            (b'argument -R/--no-report: not allowed with argument -r/--report', '-rR'),
+            (b'must specify one of --trace, --count, --report, --listfuncs, or --trackcalls', '-g'),
+            (b'-r/--report requires -f/--file', '-r'),
+            (b'--summary can only be used with --count or --report', '-sT'),
+            (b'unrecognized arguments: -y', '-y'))
+        for message, *args in _errors:
+            *_, stderr = assert_python_failure('-m', 'trace', *args)
+            self.assertIn(message, stderr)
+
+    def test_listfuncs_flag_success(self):
+        with open(TESTFN, 'w') as fd:
+            self.addCleanup(unlink, TESTFN)
+            fd.write("a = 1\n")
+            status, stdout, stderr = assert_python_ok('-m', 'trace', '-l', TESTFN)
+            self.assertIn(b'functions called:', stdout)
 
 if __name__ == '__main__':
     unittest.main()

Lib/trace.py

@@ -48,6 +48,7 @@ Sample use, programmatically
   r.write_results(show_missing=True, coverdir="/tmp")
 """
 __all__ = ['Trace', 'CoverageResults']
+import argparse
 import linecache
 import os
 import re
@@ -76,51 +77,6 @@ else:
         sys.settrace(None)
         threading.settrace(None)
 
-def _usage(outfile):
-    outfile.write("""Usage: %s [OPTIONS] <file> [ARGS]
-
-Meta-options:
---help                Display this help then exit.
---version             Output version information then exit.
-
-Otherwise, exactly one of the following three options must be given:
--t, --trace           Print each line to sys.stdout before it is executed.
--c, --count           Count the number of times each line is executed
-                      and write the counts to <module>.cover for each
-                      module executed, in the module's directory.
-                      See also `--coverdir', `--file', `--no-report' below.
--l, --listfuncs       Keep track of which functions are executed at least
-                      once and write the results to sys.stdout after the
-                      program exits.
--T, --trackcalls      Keep track of caller/called pairs and write the
-                      results to sys.stdout after the program exits.
--r, --report          Generate a report from a counts file; do not execute
-                      any code.  `--file' must specify the results file to
-                      read, which must have been created in a previous run
-                      with `--count --file=FILE'.
-
-Modifiers:
--f, --file=<file>     File to accumulate counts over several runs.
--R, --no-report       Do not generate the coverage report files.
-                      Useful if you want to accumulate over several runs.
--C, --coverdir=<dir>  Directory where the report files.  The coverage
-                      report for <package>.<module> is written to file
-                      <dir>/<package>/<module>.cover.
--m, --missing         Annotate executable lines that were not executed
-                      with '>>>>>> '.
--s, --summary         Write a brief summary on stdout for each file.
-                      (Can only be used with --count or --report.)
--g, --timing          Prefix each line with the time since the program started.
-                      Only used while tracing.
-
-Filters, may be repeated multiple times:
---ignore-module=<mod> Ignore the given module(s) and its submodules
-                      (if it is a package).  Accepts comma separated
-                      list of module names
---ignore-dir=<dir>    Ignore files in the given directory (multiple
-                      directories can be joined by os.pathsep).
-""" % sys.argv[0])
-
 PRAGMA_NOCOVER = "#pragma NO COVER"
 
 # Simple rx to find lines with no code.
@@ -264,7 +220,13 @@ class CoverageResults:
 
     def write_results(self, show_missing=True, summary=False, coverdir=None):
         """
-        @param coverdir
+        Write the coverage results.
+
+        :param show_missing: Show lines that had no hits.
+        :param summary: Include coverage summary per module.
+        :param coverdir: If None, the results of each module are placed in it's
+                         directory, otherwise it is included in the directory
+                         specified.
         """
         if self.calledfuncs:
             print()
@@ -646,168 +608,135 @@ class Trace:
                                calledfuncs=self._calledfuncs,
                                callers=self._callers)
 
-def _err_exit(msg):
-    sys.stderr.write("%s: %s\n" % (sys.argv[0], msg))
-    sys.exit(1)
-
-def main(argv=None):
-    import getopt
-
-    if argv is None:
-        argv = sys.argv
-    try:
-        opts, prog_argv = getopt.getopt(argv[1:], "tcrRf:d:msC:lTg",
-                                        ["help", "version", "trace", "count",
-                                         "report", "no-report", "summary",
-                                         "file=", "missing",
-                                         "ignore-module=", "ignore-dir=",
-                                         "coverdir=", "listfuncs",
-                                         "trackcalls", "timing"])
-
-    except getopt.error as msg:
-        sys.stderr.write("%s: %s\n" % (sys.argv[0], msg))
-        sys.stderr.write("Try `%s --help' for more information\n"
-                         % sys.argv[0])
-        sys.exit(1)
-
-    trace = 0
-    count = 0
-    report = 0
-    no_report = 0
-    counts_file = None
-    missing = 0
-    ignore_modules = []
-    ignore_dirs = []
-    coverdir = None
-    summary = 0
-    listfuncs = False
-    countcallers = False
-    timing = False
-
-    for opt, val in opts:
-        if opt == "--help":
-            _usage(sys.stdout)
-            sys.exit(0)
-
-        if opt == "--version":
-            sys.stdout.write("trace 2.0\n")
-            sys.exit(0)
-
-        if opt == "-T" or opt == "--trackcalls":
-            countcallers = True
-            continue
-
-        if opt == "-l" or opt == "--listfuncs":
-            listfuncs = True
-            continue
-
-        if opt == "-g" or opt == "--timing":
-            timing = True
-            continue
-
-        if opt == "-t" or opt == "--trace":
-            trace = 1
-            continue
-
-        if opt == "-c" or opt == "--count":
-            count = 1
-            continue
-
-        if opt == "-r" or opt == "--report":
-            report = 1
-            continue
-
-        if opt == "-R" or opt == "--no-report":
-            no_report = 1
-            continue
-
-        if opt == "-f" or opt == "--file":
-            counts_file = val
-            continue
-
-        if opt == "-m" or opt == "--missing":
-            missing = 1
-            continue
-
-        if opt == "-C" or opt == "--coverdir":
-            coverdir = val
-            continue
-
-        if opt == "-s" or opt == "--summary":
-            summary = 1
-            continue
-
-        if opt == "--ignore-module":
-            for mod in val.split(","):
-                ignore_modules.append(mod.strip())
-            continue
-
-        if opt == "--ignore-dir":
-            for s in val.split(os.pathsep):
-                s = os.path.expandvars(s)
-                # should I also call expanduser? (after all, could use $HOME)
-
-                s = s.replace("$prefix",
-                              os.path.join(sys.base_prefix, "lib",
-                                           "python" + sys.version[:3]))
-                s = s.replace("$exec_prefix",
-                              os.path.join(sys.base_exec_prefix, "lib",
-                                           "python" + sys.version[:3]))
-                s = os.path.normpath(s)
-                ignore_dirs.append(s)
-            continue
-
-        assert 0, "Should never get here"
-
-    if listfuncs and (count or trace):
-        _err_exit("cannot specify both --listfuncs and (--trace or --count)")
-
-    if not (count or trace or report or listfuncs or countcallers):
-        _err_exit("must specify one of --trace, --count, --report, "
-                  "--listfuncs, or --trackcalls")
-
-    if report and no_report:
-        _err_exit("cannot specify both --report and --no-report")
-
-    if report and not counts_file:
-        _err_exit("--report requires a --file")
-
-    if no_report and len(prog_argv) == 0:
-        _err_exit("missing name of file to run")
-
-    # everything is ready
-    if report:
-        results = CoverageResults(infile=counts_file, outfile=counts_file)
-        results.write_results(missing, summary=summary, coverdir=coverdir)
-    else:
-        sys.argv = prog_argv
-        progname = prog_argv[0]
-        sys.path[0] = os.path.split(progname)[0]
-
-        t = Trace(count, trace, countfuncs=listfuncs,
-                  countcallers=countcallers, ignoremods=ignore_modules,
-                  ignoredirs=ignore_dirs, infile=counts_file,
-                  outfile=counts_file, timing=timing)
+def main():
+
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--version', action='version', version='trace 2.0')
+
+    grp = parser.add_argument_group('Main options',
+            'One of these (or --report) must be given')
+
+    grp.add_argument('-c', '--count', action='store_true',
+            help='Count the number of times each line is executed and write '
+                 'the counts to <module>.cover for each module executed, in '
+                 'the module\'s directory. See also --coverdir, --file, '
+                 '--no-report below.')
+    grp.add_argument('-t', '--trace', action='store_true',
+            help='Print each line to sys.stdout before it is executed')
+    grp.add_argument('-l', '--listfuncs', action='store_true',
+            help='Keep track of which functions are executed at least once '
+                 'and write the results to sys.stdout after the program exits. '
+                 'Cannot be specified alongside --trace or --count.')
+    grp.add_argument('-T', '--trackcalls', action='store_true',
+            help='Keep track of caller/called pairs and write the results to '
+                 'sys.stdout after the program exits.')
+
+    grp = parser.add_argument_group('Modifiers')
+
+    _grp = grp.add_mutually_exclusive_group()
+    _grp.add_argument('-r', '--report', action='store_true',
+            help='Generate a report from a counts file; does not execute any '
+                 'code. --file must specify the results file to read, which '
+                 'must have been created in a previous run with --count '
+                 '--file=FILE')
+    _grp.add_argument('-R', '--no-report', action='store_true',
+            help='Do not generate the coverage report files. '
+                 'Useful if you want to accumulate over several runs.')
+
+    grp.add_argument('-f', '--file',
+            help='File to accumulate counts over several runs')
+    grp.add_argument('-C', '--coverdir',
+            help='Directory where the report files go. The coverage report '
+                 'for <package>.<module> will be written to file '
+                 '<dir>/<package>/<module>.cover')
+    grp.add_argument('-m', '--missing', action='store_true',
+            help='Annotate executable lines that were not executed with '
+                 '">>>>>> "')
+    grp.add_argument('-s', '--summary', action='store_true',
+            help='Write a brief summary for each file to sys.stdout. '
+                 'Can only be used with --count or --report')
+    grp.add_argument('-g', '--timing', action='store_true',
+            help='Prefix each line with the time since the program started. '
+                 'Only used while tracing')
+
+    grp = parser.add_argument_group('Filters',
+            'Can be specified multiple times')
+    grp.add_argument('--ignore-module', action='append', default=[],
+            help='Ignore the given module(s) and its submodules'
+                 '(if it is a package). Accepts comma separated list of '
+                 'module names.')
+    grp.add_argument('--ignore-dir', action='append', default=[],
+            help='Ignore files in the given directory '
+                 '(multiple directories can be joined by os.pathsep).')
+
+    parser.add_argument('filename', nargs='?',
+            help='file to run as main program')
+    parser.add_argument('arguments', nargs=argparse.REMAINDER,
+            help='arguments to the program')
+
+    opts = parser.parse_args()
+
+    if opts.ignore_dir:
+        rel_path = 'lib', 'python{0.major}.{0.minor}'.format(sys.version_info)
+        _prefix = os.path.join(sys.base_prefix, *rel_path)
+        _exec_prefix = os.path.join(sys.base_exec_prefix, *rel_path)
+
+    def parse_ignore_dir(s):
+        s = os.path.expanduser(os.path.expandvars(s))
+        s = s.replace('$prefix', _prefix).replace('$exec_prefix', _exec_prefix)
+        return os.path.normpath(s)
+
+    opts.ignore_module = [mod.strip()
+                          for i in opts.ignore_module for mod in i.split(',')]
+    opts.ignore_dir = [parse_ignore_dir(s)
+                       for i in opts.ignore_dir for s in i.split(os.pathsep)]
+
+    if opts.report:
+        if not opts.file:
+            parser.error('-r/--report requires -f/--file')
+        results = CoverageResults(infile=opts.file, outfile=opts.file)
+        return results.write_results(opts.missing, opts.summary, opts.coverdir)
+
+    if not any([opts.trace, opts.count, opts.listfuncs, opts.trackcalls]):
+        parser.error('must specify one of --trace, --count, --report, '
+                     '--listfuncs, or --trackcalls')
+
+    if opts.listfuncs and (opts.count or opts.trace):
+        parser.error('cannot specify both --listfuncs and (--trace or --count)')
+
+    if opts.summary and not opts.count:
+        parser.error('--summary can only be used with --count or --report')
+
+    if opts.filename is None:
+        parser.error('filename is missing: required with the main options')
+
+    sys.argv = opts.filename, *opts.arguments
+    sys.path[0] = os.path.dirname(opts.filename)
+
+    t = Trace(opts.count, opts.trace, countfuncs=opts.listfuncs,
+              countcallers=opts.trackcalls, ignoremods=opts.ignore_module,
+              ignoredirs=opts.ignore_dir, infile=opts.file,
+              outfile=opts.file, timing=opts.timing)
     try:
-            with open(progname) as fp:
-                code = compile(fp.read(), progname, 'exec')
+        with open(opts.filename) as fp:
+            code = compile(fp.read(), opts.filename, 'exec')
         # try to emulate __main__ namespace as much as possible
         globs = {
-                '__file__': progname,
+            '__file__': opts.filename,
             '__name__': '__main__',
             '__package__': None,
             '__cached__': None,
         }
         t.runctx(code, globs, globs)
     except OSError as err:
-            _err_exit("Cannot run file %r because: %s" % (sys.argv[0], err))
+        sys.exit("Cannot run file %r because: %s" % (sys.argv[0], err))
     except SystemExit:
         pass
 
     results = t.results()
 
-        if not no_report:
-            results.write_results(missing, summary=summary, coverdir=coverdir)
+    if not opts.no_report:
+        results.write_results(opts.missing, opts.summary, opts.coverdir)
 
 if __name__=='__main__':
     main()