Filter not applied

I set include the following into my buld.gradle:

    ktlint {
        debug = true
        verbose = true
        filter {
            exclude("**/generated/**")
        }
    }

However, the files below generated are STILL checked:

$ ./gradlew ktlintCheck

> Task :nano-container:ktlintMainSourceSetCheck FAILED
[DEBUG] Discovered ruleset "standard"
[DEBUG] Discovered reporter "plain"
[DEBUG] Discovered reporter "json"
[DEBUG] Discovered reporter "checkstyle"
[DEBUG] Initializing "plain" reporter with {verbose=true, color=true}
[DEBUG] Initializing "plain" reporter with {verbose=true, color=true}, output=XXX/nano-container/build/reports/ktlint/ktlintMainSourceSetCheck.txt
[DEBUG] Checking XXX/nano-container/build/generated/source/BuildInfo.kt
...
[DEBUG] Discovered .editorconfig (XXX) {indent_size=2}
XXX/nano-container/build/generated/source/BuildInfo.kt:1:1: Wildcard import (cannot be auto-corrected) (no-wildcard-imports)
XXX/nano-container/build/generated/source/BuildInfo.kt:246:14: Missing spacing before "=" (op-spacing)
"plain" report written to XXX/nano-container/build/reports/ktlint/ktlintMainSourceSetCheck.txt
[DEBUG] 879ms / 6 file(s) / 2 error(s)

The file XXX/nano-container/build/generated/source/BuildInfo.kt should have been ignored.

 ./gradlew --version

------------------------------------------------------------
Gradle 5.2.1
------------------------------------------------------------

Build time:   2019-02-08 19:00:10 UTC
Revision:     f02764e074c32ee8851a4e1877dd1fea8ffb7183

Kotlin DSL:   1.1.3
Kotlin:       1.3.20
Groovy:       2.5.4
Ant:          Apache Ant(TM) version 1.9.13 compiled on July 10 2018
JVM:          1.8.0_191 (Oracle Corporation 25.191-b12)
OS:           Linux 4.15.0-46-generic amd64

[derolf]

Okay, I think I found the underlying issue.

Actually, BuildInfo.kt sits at build/generated/source/BuildInfo.kt and is added to the build via:

sourceSets.main.java.srcDir new File(buildDir, 'generated/source/')

But, if I do …

        filter {
            exclude({println(it.path)})
        }

… it just prints BuildInfo.kt, so the prefix is stripped from the filename. I guess that string-patterns are applied to the stripped and not absolute path.

Here is the workaround:

    ktlint {
        filter {
            exclude({it.file.absolutePath.contains("/generated/")})
        }
    }

However that will kick in if there is any “/generated/” in the full path.

[derolf]

    ktlint {
        filter {
            exclude({projectDir.toURI().relativize(it.file.toURI()).path.contains("/generated/")})
        }
    }

This will exclude all files in the project that have /generated/ in their path relative to the project directory. Worth adding to README?