Adds makefile refinements and nyaml as dependency

[domna]

This adds several things:

• Proper build of nxdl.xml files even if they are not present. This is now completely based on the available yaml files
• Removal of nyaml for loop
• Add a new Makefile nyaml.mk for building nyaml targets to be invoked like this make -f nyaml.mk
• nyaml as a dependency to provide the nyaml2nxdl command. Here is the pypi page of nyaml.

[domna]

It seems like the content of nyaml.mk is duplicated in Makefile

It is not, the rule is reversed. One is from nxdl.xml to yaml (in nyaml.mk) the other one is from yaml to nxdl.xml (in Makefile). It is split into two files because otherwise make has a cyclic dependency and cannot be run, using another makefile splits the cycle and allows us to use it in both directions.

Here is a comparison of the two rules for the Makefile (top) and nyaml.mk (bottom):

$(BASE_CLASS_DIR)/%.nxdl.xml : $(BASE_CLASS_DIR)/$(NYAML_SUBDIR)/%.yaml
    nyaml2nxdl $< --output-file $@

$(BASE_CLASS_DIR)/$(NYAML_SUBDIR)/%.yaml : $(BASE_CLASS_DIR)/%.nxdl.xml
    nyaml2nxdl $< --output-file $@

This is also why the nyaml.mk file is called for the nyaml command:

nyaml:
    $(MAKE) -f nyaml.mk

[PeterC-DLS]

Ah, sorry, I should look closer!

[domna]

I don't understand what the two new make targets are supposed to do.

They build nyaml files from nxdl and vice versa.

Can you add documentation in the README file on how to use them (I suppose make nxdl and make nyaml) and what they do?

Yes

Also they do not work for me:

(py38) denolf@lindenolf:~/dev/nexus/definitions$ make nxdl
make: Nothing to be done for 'nxdl'.

(py38) denolf@lindenolf:~/dev/nexus/definitions$ make nyaml
make -f nyaml.mk
make[1]: Entering directory '/home/denolf/dev/nexus/definitions'
nyaml2nxdl base_classes/NXsubentry.nxdl.xml --output-file base_classes/nyaml/NXsubentry.yaml
Traceback (most recent call last):
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/bin/nyaml2nxdl", line 8, in <module>
    sys.exit(launch_tool())
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/nyaml/cli.py", line 141, in launch_tool
    converter.print_yml(input_file, yaml_out_file, verbose)
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/nyaml/nxdl2nyaml.py", line 184, in print_yml
    self.xmlparse(output_yml, xml_tree, depth, verbose)
  File "/users/denolf/virtualenvs/nexus/ubuntu_20_04/py38/lib/python3.8/site-packages/nyaml/nxdl2nyaml.py", line 955, in xmlparse
    with open(output_yml, "a", encoding="utf-8") as file_out:
FileNotFoundError: [Errno 2] No such file or directory: 'base_classes/nyaml/NXsubentry.yaml'
make[1]: *** [nyaml.mk:12: base_classes/nyaml/NXsubentry.yaml] Error 1
make[1]: Leaving directory '/home/denolf/dev/nexus/definitions'
make: *** [Makefile:112: nyaml] Error 2

Indeed, there was an error. The nyaml folders to build the files into were not created. This slipped me because I tested this in a repo where these files are always present. I added a fix so that the folders are created. It should work now. Thank you for reporting this.

The new additions to the makefile are too complicated for me. I don't understand at all what's going on. In addition you have the second makefile to add to the confusion. Can you move the logic of make nxdl and make nyaml to the dev_tools main CLI instead and call that in the nxdl and nyaml targets?

I would prefer having them in the makefile as this fits exactly the purpose of make: making files.

I addressed all your issues.

[domna]

Thanks for the changes. The conversion to and from yaml works now with make.

One last request: could you add nyaml/ to .gitignore?

# Build artifacts
build/
makelog.txt
nyaml/

Added it