I have a generator called with yo generator:module [ModuleName] .
I want to handle the error when ModuleName argument is undefined and still be able to use generator:module --help without arguments.
First, you'll need to make the arguments non required.
Then if the argument was not provided, handle the case yourself as you see fit.
Related
I want to define an "expect_failure" boolean attribute for a bazel rule set that I'm devising, so I can properly write tests for my tool chain. However:
ERROR: /blah/blah.bzl:7:26: cannot add attribute: There is already a built-in attribute 'expect_failure' which cannot be overridden.
I can't find documentation for this "built-in attribute" anywhere. When I attempt to make use of this built in attribute, I find that it is of type "string" rather than "bool" which maybe implies some nuance to its implementation. When I attempt to naively use it by defining "expect_failure" to be the string "True", I see an unexpected error message:
ERROR: /blah/blah/BUILD:159:21: in _verilog_test rule //blah/blah:blah-test: Expected failure not found: True
Can anyone illuminate correct use of the built-in "expect_failure" attribute for me?
expect_failure is use for analysis test framework. It depends on analysistest, and use to verify that a rule fails given certain inputs or in certain state.
Here is the docs
I have Avoid redundant argument values. warning in my code, and it is okay for that moment. Is there any #ignore option in dart for that?
DON'T pass an argument that matches the corresponding parameter's default value.
I have written a simple function named is_zero in Erlang which checks if the argument to the function is zero. The code is as follows.
-module(match).
-export([is_zero/1]).
% defining a function named is_zero
% this is a function with two clauses
% these clauses are matched sequentially
is_zero(0) ->
true;
is_zero(X) ->
false.
As I try to compile the code using c(match).(the file is also named as match.erl) it returns a warning saying variable "X" is unused.
If I run is_zero(0). in spite of the warning, the shell throws an exception error saying undefined shell command is_zero/1
What am I doing wrong?
I cannot think of any rectification neither can I find any advice that will help.
Functions in Erlang are defined inside modules. To distinguish functions from different modules, you need to prepend the module name to a function. In this case, you need to run match:is_zero(0). Instead of just is_zero(0)..
To avoid the warning saying variable "X" is unused, use the underscore variable:
is_zero(_) ->
false.
Note that variable names can be useful even if unused, to improve readability. If you want to name your variable and still avoid the compiler warning, prepend the underscore to the name:
is_zero(_Num) ->
false.
I've been trying to write a script-fu script for GIMP 2.6+ that uses one of the built-in script-fu methods, namely the script-fu-add-bevel method. My problem is that whenever I call it, either in the console or in my script, I get:
Error: Procedure execution of gimp-drawable-type-with-alpha failed on invalid input
arguments: Procedure 'gimp-drawable-type-with-alpha' has been called with an
invalid ID for argument 'drawable'. Most likely a plug-in is trying to work on a layer that
doesn't exist any longer.
This is really strange because I can clearly see by calling gimp-image-get-active-drawable with my image ID as the parameter that the layer ID that I'm passing to the script-fu method exists. The script is erroring while calling gimp-drawable-type-with-alpha, but I can call this method with the same ID in the console with no error. How can I fix this problem?
From this forum post, I learned that when calling a script-fu method, you shouldn't pass in the run-mode argument. This is done behind the scenes, and if you pass anything for that value, it will be interpreted as the second argument! This means that every argument you send in will be one parameter off, and it's only a matter of time before the script crashes.
So calling script-fu-add-bevel from another script-fu would look something like this:
(script-fu-add-bevel img layer bevel-width FALSE FALSE)
I have lua function which accept the arguments. I want to get the name of the argument so that I can log the argument along with error.
Any idea how to get argument name in lua?
Use debug.getlocal.