![]() ![]() ![]() By default, it is the first sentence of the help message of the command, unless it is too long. For commands, a short help snippet is generated.The help page for a particular command can be shown with -help in the CLI.A decorator block_name is present in the base module which adds an argument (non-mandatory) block_name to the particular command that uses it.Therefore, these parameters will show up in the help page of the respective command rather than the command group. These options are not provided as the options to the base command group intentionally because they actually make sense with the command itself, otherwise the command gr_modtool add -t general -skip-lib will look like gr_modtool add -skip-lib -t general which is not user-friendly. A decorator function common_params is present in the base module to remove the redundancy of adding the same options in every module.Moreover, documentation of the argument is not generated by click and it has to be done manually. Note: The basic difference between arguments and options is that arguments are positional and mandatory by default unlike options, although arguments can also be made optional as in the case with the modtool scripts. The user input values of all these parameters are then passed to the run() function of the respective module defined in its core class. The function is decorated by the decorator, which adds the functionalities of the class click.Command and automatically attaches the decorated options and arguments to it. If a command (after gr_modtool) is provided in the interface which has a corresponding module modtool_command.py, where the command is the user input command, the cli() function of the corresponding module is invoked with the context of the group instance in the base module. If no further command is provided in the command-line, the help page is displayed with all the in-tree plug-ins commands as well as the commands from the external plug-ins, if any. Initially all commands with gr_modtool in the command-line interface entered by the user pass through the cli() function of modtool_base.py. If the module is found in-tree, then the cli() function of the respective module is called. It first tries to import the module for the command by searching the in-tree modules, then checks for the registration of command via other sources. The function get_command returns a command object by the user input command. It first searches for the in-tree commands, the commands in its own directory, and then searches for other registered commands through external plug-ins or otherwise (in case of the modtool, they are only registered through external plug-ins). The function list_commands lists all the commands for the gr_modtool. The parent class functions list_commands and get_command have been overridden in the child class to enable a plug-in architecture for gr_modtool. ![]() Gr_modtool uses the class click.Group as the parent class for its base module's CommandCLI class. Click is very simple to code and visualize.Ĭlick is based on decorators and therefore enables simple syntax for calling high order internal functions.Click comes with useful helpers like ANSI colors.Click works the same in Python 2 as well as in Pythonn3.Click supports prompting of custom values.Click is fully nestable and composable.Some of the advantages of using Click for CLI are:. Gr-modtool uses the Click Python package for its command line interface. Gr_modtool is available in the GNU Radio source tree and is installed by default. One can go through the block coding guide for getting an insight of coding the block. The more the module is custom and has specific changes, the less useful gr_modtool will be, but it is probably the best place to start with any new module or block. Note that gr_modtool makes a lot of assumptions on how the code looks like. gr_modtool is a script which aims to help with all these things by automatically editing makefiles, using templates, and doing as much work as possible for the developer such that one can jump straight into the DSP coding. ![]() While developing an Out Of Tree module, there's a lot of boring, monotonous work involved: boilerplate code, makefile editing, etc. ![]()
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