A very simple Go package to read flags from a JSON object. Define your flags as normal using
the built-in flag package, then call
jsonflags.Parse()
instead of flag.Parse().
The path of the JSON file to read is taken from a string flag called "config" which should
be defined by the application, like this:
flag.String("config", "config.json", "path to JSON config file")
If there is no "config" flag, jsonflags.Parse() behaves identically to flag.Parse().
If "config" has a non-empty default value, it specifies a file to load if the program is
not invoked with a -config myconfig.json argument. When this default path is used,
jsonflags does not return an error if the file is missing.
Arguments supplied on the command line override those defined by the JSON config, which in turn override the defaults.