We recently came across a part of our grunt file that was written by a former colleague. While the code functions correctly, the specific purpose of one segment remains a mystery to us!
Here is the enigmatic code snippet:
dist: {
files: [{
expand: true,
cwd: '<%= config.tmp %>/styles/',
src: '{,**/}*.css',
dest: '<%= config.tmp %>/styles/'
}]
}
The puzzling section is the {,**/} on line 5. It would be great to uncover its exact significance!
As stated in the provided documentation:
{}enables a comma-separated list of "or" expressions
Hence,
'{,**/}*.css',
will identify both *.css and **/*.css.
The initial pattern within the curly braces is deemed unnecessary, as the second one is already inclusive of .css files in the current/root directory.
{,**/}*.css signifies the utilization of Brace expansion in the specified pattern. Grunt employs the Minimatch library, which is capable of supporting this feature. Within the curly braces, the comma-separated patterns are first expanded into two distinct patterns, *.css and **/*.css in this instance. To validate your pattern, you can make use of globster.xyz
An excellent response from sotirios-delimanolis:
Understanding the Usage of ** (double star) in glob Syntax in JAVA
In summary, when using one star, nested paths will be ignored:
/a/a/a.css - will be ignored
The presence of a comma within the curly braces ensures that files or directories containing commas will not be ignored:
dsadsad,dasdsadas/a.css
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