[feature] Provide an api for conan graph info

[fredizzimo]

What is your suggestion?

We currently use the following code for automatically writing the conan graph to files when compiling

def write_graph_info(filename, result, formatter):
    # The formatters write to stdout, so change it to redirect to a file temporarily
    with open(filename, "w", encoding="utf-8") as f:
        with redirect_stdout(f):
            with redirect_stderr(f):
                try:
                    formatter(result)
                except GraphError:
                    # The formatters can raise a GraphError after the graph is written
                    # Let's ignore that, since we deal with the errors after this
                    pass
    logging.info(filename)


def write_graph_infos(proj, graph):
    delete_html_graph_template(proj.conan)

    result = {
        "graph": graph,
        "field_filter": None,
        "package_filter": None,
        "conan_api": proj.conan.api,
    }

    build_dir = proj.build_dir

    logging.info("\n****** More details can be found in the following files: ******")
    write_graph_info(build_dir / "packages.txt", result, format_graph_info)
    write_graph_info(build_dir / "packages.html", result, format_graph_html)
    write_graph_info(build_dir / "packages.dot", result, format_graph_dot)
    logging.info("\n***************************************************************\n")

This relies on some internal functionality, which is not ideal, but worse with Conan 2.10.0 caused the above code to stop working.

The workaround for the colorama crash here #17259, changes the stdout and stderr, which causes our own redirects to fail. But rather than fixing that, I think a proper API function that allows to write to files would be better.

Have you read the CONTRIBUTING guide?

• I've read the CONTRIBUTING guide