Filter output of a grunt task - gruntjs

Question

I have several grunt tasks which internally use grunt-shell to execute various CLI commands.
I want to hide certain logs printed to the output console by these CLI commands.
Am trying to use grunt-reporter for this but unable to get it working.
Gruntfile.js
reporter: {
shell:{
options: {
tasks: ['shell'],
header: false
}
}
}

Answer 1

The short answer... It's not possible for grunt-reporter by itself to hide logs generated by a grunt-shell command.
The long answer including workaround... The logs from a grunt-shell command are generated by the shell/bash command itself and not via a node package/script. The examples shown on the grunt-reporter homepage are intercepting/manipulating a message from a node package written to stdout.
Consider the following...
Simple gist
module.exports = function(grunt) {
grunt.initConfig({
shell: {
listFiles: {
command: 'ls src/js/*.js'
}
}
});
require('load-grunt-tasks')(grunt);
grunt.registerTask('default', [
'shell:listFiles'
]);
};
Running $ grunt via the CLI outputs something like this:
Running "shell:listFiles" (shell) task
src/js/a.js
src/js/b.js
src/js/c.js
Done.
Hide the header...
Utilizing grunt-reporter it's possible, (at best for this scenario), to hide the header using a config as follows:
module.exports = function(grunt) {
grunt.initConfig({
reporter: {
shell: {
options: {
tasks: ['shell:listFiles'],
header: false
}
}
},
shell: {
listFiles: {
command: 'ls src/js/*.js'
}
}
});
require('load-grunt-tasks')(grunt);
grunt.registerTask('default', [
'reporter:shell', //<-- Note: The reporter task is called first.
'shell:listFiles'
]);
};
Running $ grunt via the CLI will now output something like this (Note: the header has been hidden, however the log from the ls command persists as it directly comes from the bash/shell command):
src/js/a.js
src/js/b.js
src/js/c.js
Done.
Even after adding the suppress: true to the reporter options the paths logs from the ls command persist.
Workaround
I think the only way to hide the logs from a CLI command will be to redirect the output messages to /dev/null in the 'grunt-shell' commands:
module.exports = function(grunt) {
grunt.initConfig({
reporter: {
shell: {
options: {
tasks: ['shell:listFiles'],
header: false,
}
}
},
shell: {
listFiles: {
command: 'ls src/js/*.js > /dev/null' //<-- redirect the output messages
}
}
});
require('load-grunt-tasks')(grunt);
grunt.registerTask('default', [
'reporter:shell', //<-- Note: The reporter task is called first.
'shell:listFiles'
]);
};
This time running $ grunt via the CLI successfully hides the messages/logs and only reports:
Done.
Note: The addition of > /dev/null will only redirect the messages/logs and any errors will continue to get reported. Using > /dev/null 2>&1 would also hide any errors too.