Add conan config show <conf> command

conan/api/subapi/config.py

@@ -21,3 +21,7 @@ def install(self, path_or_url, verify_ssl, config_type=None, args=None,
     def get(self, name, default=None, check_type=None):
         app = ConanApp(self.conan_api.cache_folder)
         return app.cache.new_config.get(name, default=default, check_type=check_type)
+
+    def show(self, pattern):
+        app = ConanApp(self.conan_api.cache_folder)
+        return app.cache.new_config.show(pattern)

conan/cli/commands/config.py

@@ -66,3 +66,14 @@ def config_list(conan_api, parser, subparser, *args):
     """
     parser.parse_args(*args)
     return BUILT_IN_CONFS
+
+
+@conan_subcommand(formatters={"text": list_text_formatter, "json": default_json_formatter})
+def config_show(conan_api, parser, subparser, *args):
+    """
+    Get the value of the specified conf
+    """
+    subparser.add_argument('pattern', help='Conf item(s) pattern for which to query their value')
+    args = parser.parse_args(*args)
+
+    return conan_api.config.show(args.pattern)

conans/model/conf.py

@@ -1,5 +1,6 @@
 import re
 import os
+import fnmatch
 
 from collections import OrderedDict
 
@@ -306,6 +307,11 @@ def pop(self, conf_name, default=None):
         self._values.pop(conf_name, None)
         return value
 
+    def show(self, fnpattern, pattern=""):
+        return {key: self.get(key)
+                for key in self._values.keys()
+                if fnmatch.fnmatch(pattern + key, fnpattern)}
+
     def copy(self):
         c = Conf()
         c._values = self._values.copy()
@@ -475,12 +481,30 @@ def __bool__(self):
 
     def get(self, conf_name, default=None, check_type=None):
         """
-        Get the value of the  conf name requested and convert it to the [type]-like passed.
+        Get the value of the conf name requested and convert it to the [type]-like passed.
         """
         pattern, name = self._split_pattern_name(conf_name)
         return self._pattern_confs.get(pattern, Conf()).get(name, default=default,
                                                             check_type=check_type)
 
+    def show(self, fnpattern):
+        """
+        Get the value of the confs that match the requested pattern
+        """
+        result = {}
+
+        for patter_key, patter_conf in self._pattern_confs.items():
+            if patter_key is None:
+                patter_key = ""
+            else:
+                patter_key += ":"
+
+            pattern_values = patter_conf.show(fnpattern, patter_key)
+            result.update({patter_key + pattern_subkey: pattern_subvalue
+                           for pattern_subkey, pattern_subvalue in pattern_values.items()})
+
+        return result
+
     def pop(self, conf_name, default=None):
         """
         Remove the conf name passed.

conans/test/integration/command/config_test.py

@@ -108,3 +108,46 @@ def _assert_config_not_exists(path):
     _assert_config_exists("foo")
 
     os.listdir(tc.current_folder)
+
+
+def test_config_show():
+    globalconf = textwrap.dedent("""
+    tools.build:jobs=42
+    tools.files.download:retry_wait=10
+    tools.files.download:retry=7
+    core.net.http:timeout=30
+    core.net.http:max_retries=5
+    zlib/*:user.mycategory:retry=True
+    zlib/*:user.mycategory:foo=0
+    zlib/*:user.myothercategory:foo=0
+    """)
+    tc = TestClient()
+    tc.save_home({"global.conf": globalconf})
+    tc.run("config show tools.build:jobs")
+    assert "42" in tc.out
+
+    tc.run("config show core*")
+    assert "core.net.http:timeout" in tc.out
+    assert "30" in tc.out
+    assert "core.net.http:max_retries" in tc.out
+    assert "5" in tc.out
+
+    tc.run("config show *retr*")
+    assert "tools.files.download:retry_wait" in tc.out
+    assert "tools.files.download:retry" in tc.out
+    assert "core.net.http:max_retries" in tc.out
+    assert "zlib/*:user.mycategory:retry" in tc.out
+
+    tc.run("config show zlib*")
+    assert "zlib/*:user.mycategory:retry" in tc.out
+    assert "zlib/*:user.mycategory:foo" in tc.out
+    assert "zlib/*:user.myothercategory:foo" in tc.out
+
+    tc.run("config show zlib/*")
+    assert "zlib/*:user.mycategory:retry" in tc.out
+    assert "zlib/*:user.mycategory:foo" in tc.out
+    assert "zlib/*:user.myothercategory:foo" in tc.out
+
+    tc.run("config show zlib/*:foo")
+    assert "zlib/*:user.mycategory:foo" in tc.out
+    assert "zlib/*:user.myothercategory:foo" in tc.out