feat(cli): Attempt at patching the existing event with a new file reader to support trunk based flows

src/commonMain/kotlin/com/monta/slack/notifier/command/PublishSlackCommand.kt

@@ -8,6 +8,7 @@ import com.monta.slack.notifier.model.JobStatus
 import com.monta.slack.notifier.model.JobType
 import com.monta.slack.notifier.service.PublishSlackService
 import com.monta.slack.notifier.util.JsonUtil
+import com.monta.slack.notifier.util.populateEventFromTrunkBasedEvent
 import com.monta.slack.notifier.util.readStringFromFile
 import kotlinx.coroutines.runBlocking
 
@@ -91,7 +92,13 @@ class PublishSlackCommand : CliktCommand() {
 
     private fun getGithubPushContext(): GithubPushContext {
         val eventJson = readStringFromFile(githubEventPath)
-        val event = JsonUtil.instance.decodeFromString<GithubPushContext.Event>(eventJson)
+        var event = JsonUtil.instance.decodeFromString<GithubPushContext.Event>(eventJson)
+
+        // In builds from trunk based workflows, the json event is different
+        // We use this hack to populate the original event with new info
+        if (event.headCommit == null) {
+            event = populateEventFromTrunkBasedEvent(eventJson, event)
+        }
         return GithubPushContext(
             repository = githubRepository,
             runId = githubRunId,

src/commonMain/kotlin/com/monta/slack/notifier/model/GithubPushContext.kt

@@ -33,7 +33,7 @@ data class GithubPushContext(
     @Serializable
     data class Event(
         @SerialName("head_commit")
-        val headCommit: Commit? = null,
+        var headCommit: Commit? = null,
         @SerialName("pusher")
         val pusher: Committer? = null,
         @SerialName("ref")

src/commonMain/kotlin/com/monta/slack/notifier/model/GithubTrunkBasedPushContext.kt

@@ -0,0 +1,41 @@
+package com.monta.slack.notifier.model
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class GithubTrunkBasedPushContext(
+    @SerialName("run_id")
+    val runId: String? = null, // 4. Fourth var, Name of run (should be )
+) {
+    // In this class we grab variables from a trunk based event flow
+    // Where each thing we need to populate the slack message are listed
+    @Serializable
+    data class PullRequestHead(
+        @SerialName("ref") val ref: String,
+    )
+
+    @Serializable
+    data class PullRequest(
+        @SerialName("head") val head: PullRequestHead,
+        @SerialName("title") val title: String,
+        @SerialName("user") val user: PullRequestUser,
+    )
+
+    @Serializable
+    data class PullRequestUser(
+        @SerialName("login") val login: String,
+    )
+
+    @Serializable
+    data class Repository(
+        @SerialName("full_name") val fullName: String,
+    )
+
+    @Serializable
+    data class Event(
+        @SerialName("after") val sha: String,
+        @SerialName("pull_request") val pullRequest: PullRequest,
+        @SerialName("repository") val repository: Repository,
+    )
+}

src/commonMain/kotlin/com/monta/slack/notifier/util/TrunkUtils.kt

@@ -0,0 +1,20 @@
+package com.monta.slack.notifier.util
+
+import com.monta.slack.notifier.model.GithubPushContext
+import com.monta.slack.notifier.model.GithubTrunkBasedPushContext
+
+/**
+ * Populates the existing event type with information needed to generate
+ * an entire Slack notification. This is super hacky but an easy solution
+ * without deintegrating GithubPushContext from the rest of the code.
+ */
+fun populateEventFromTrunkBasedEvent(eventJson: String, event: GithubPushContext.Event): GithubPushContext.Event {
+    val trunkBasedEvent = JsonUtil.instance.decodeFromString<GithubTrunkBasedPushContext.Event>(eventJson)
+    event.headCommit = GithubPushContext.Commit(
+        committer = GithubPushContext.Committer(name = trunkBasedEvent.pullRequest.user.login),
+        id = trunkBasedEvent.sha,
+        url = "https://github.com/${trunkBasedEvent.repository.fullName}/compare/${trunkBasedEvent.pullRequest.head.ref}",
+        message = trunkBasedEvent.pullRequest.title
+    )
+    return event
+}