Dependency insight: exclusions do not have any selection reasons

[OdysseusLives]

This is a two-part issue:

• Exclusions do not provide a selection reason on their own
• Exclusions remove all other selection reasons from dependency insight

Scenario

Given a build file containing a dependency with a substitution and an exclusion:

dependencies {
    compile 'io.netty:netty-all:4.1.20.FINAL'
}

def substitutionMessage = '✭ substitution io.netty:netty-all -> io.netty:netty-common:4.1.23.Final'
configurations.all {
    resolutionStrategy.dependencySubstitution {
        substitute module('io.netty:netty-all') because (substitutionMessage) with module('io.netty:netty-common:4.1.23.Final')
    }
}

def exclusionMessage = '✭ exclusion io.netty:netty-all'
configurations.all {
    exclude group: 'io.netty', module: 'netty-all'
}

when I run ./gradlew dependencyInsight --dependency netty
with Gradle 4.10-20180801000007+0000

then I should see no final version selected (which I do)
and I should see a selection reason as excluded (which I do not)
and I should see a selection reason as substitution (which I do not), letting me know that the substitution added to the selection, but was not the final chosen version
Note: See full output below

Example Project

Please see the whole example project at dependency-insight/docs/exclude/exclude-substitute-static/input

An example project with a force is at dependency-insight/docs/exclude/exclude-static-force/input

---

Current output for reference

> Task :dependencyInsight
No dependencies matching given input were found in configuration ':compileClasspath'

[bigdaz]

Related Gradle issue: gradle/gradle#6803