jw.build.cmds: Move build.cmds -> cmds.projects

Reorganize the Python module structure. Placing the command classes
under jw.cmds.projects instead of jw.build.cmds will allow to add a
nested command structure, with the current commands, being mostly
related to building software, found below a "projects" toplevel
command.

Other conceivable commands could be "package" for packaging, or
"distro" for commands wrapping the distribution's package manager.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/projects/CmdCreatePkgConfig.py

@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+
+import textwrap
+from argparse import Namespace, ArgumentParser
+
+from ..Cmd import Cmd
+
+class CmdCreatePkgConfig(Cmd): # export
+
+    def __init__(self) -> None:
+        super().__init__('create-pkg-config', help='Generate a pkg-config file for a module')
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+        parser.add_argument('-F', '--project-descr-file', default=None)
+        parser.add_argument('-d', '--description', default=None)
+        parser.add_argument('-n', '--name', default=None)
+        parser.add_argument('-s', '--summary', default=None)
+        parser.add_argument('-p', '--prefix', default=None)
+        parser.add_argument('-v', '--version', default=None)
+        parser.add_argument('-c', '--cflags', default=None)
+        parser.add_argument('-l', '--libflags', default=None)
+        parser.add_argument('-r', '--requires_run', default=None)
+        parser.add_argument('-R', '--requires_build', default=None)
+        parser.add_argument('-V', '--variables', nargs='*')
+
+    def _run(self, args: Namespace) -> None:
+        project_conf_var_keys = ['description', 'summary', 'requires_run', 'requires_build']
+        merged: dict[str, str] = {}
+        for key in project_conf_var_keys:
+            val = getattr(args, key)
+            if val is not None and args.project_descr_file:
+                val = self.app.get_value(args.name, key, None)
+            merged[key] = val
+
+        contents = textwrap.dedent(f"""\
+        prefix={args.prefix}
+        exec_prefix={{prefix}}
+        includedir={{prefix}}/include
+        libdir={{exec_prefix}}/lib
+
+        Name: {args.name}
+        Description: {merged['summary']}
+        Version: {args.version}
+        """)
+
+        if args.cflags is not None:
+            contents += f"Cflags: {args.cflags}\n"
+        if args.libflags is not None:
+            contents += f"Libs: {args.libflags}\n"
+        if merged['requires_run'] is not None:
+            contents += f"Requires: {cleanup_requires(merged['requires_run'])}"
+        if merged['requires_build'] is not None:
+            contents += f"Requires.private: {cleanup_requires(merged['requires_build'])}"
+        # not sure what to do with requires_devel
+
+        print(contents)