feat: Improved missing toolchain resistance

CHANGELOG.md

@@ -31,6 +31,7 @@ Changelog structure reference:
 
 - Zig
   - `zig env` failure causes an IDE error
+  - A local toolchain disappearing (std directory or zig exe deleted) is now handled properly
 
 ## [20.3.0]
 

core/src/main/kotlin/com/falsepattern/zigbrains/project/newproject/ZigProjectConfigurationData.kt

@@ -74,12 +74,20 @@ data class ZigProjectConfigurationData(
                         return@indeterminateStep false
                     }
                     val result = zig.callWithArgs(workDir, "init")
+                    if (result == null) {
+                        Notification(
+                            "zigbrains",
+                            "\"zig init\" could not run because the zig executable was missing!",
+                            NotificationType.ERROR
+                        ).notify(project)
+                        return@indeterminateStep false
+                    }
                     if (result.exitCode != 0) {
                         Notification(
                             "zigbrains",
                             "\"zig init\" failed with exit code ${result.exitCode}! Check the IDE log files!",
                             NotificationType.ERROR
-                        )
+                        ).notify(project)
                         System.err.println(result.stderr)
                         return@indeterminateStep false
                     }

core/src/main/kotlin/com/falsepattern/zigbrains/project/settings/ZigProjectSettings.kt

@@ -26,6 +26,7 @@ import com.falsepattern.zigbrains.project.toolchain.LocalZigToolchain
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.util.io.toNioPathOrNull
 import com.intellij.util.xmlb.annotations.Transient
+import kotlin.io.path.isDirectory
 import kotlin.io.path.pathString
 
 data class ZigProjectSettings(
@@ -41,7 +42,13 @@ data class ZigProjectSettings(
     @get:Transient
     @set:Transient
     override var toolchain: LocalZigToolchain?
-        get() = toolchainPath?.toNioPathOrNull()?.let { LocalZigToolchain(it) }
+        get() {
+            val nioPath = toolchainPath?.toNioPathOrNull() ?: return null
+            if (!nioPath.isDirectory()) {
+                return null
+            }
+            return LocalZigToolchain(nioPath)
+        }
         set(value) {
             toolchainPath = value?.location?.pathString
         }

core/src/main/kotlin/com/falsepattern/zigbrains/project/steps/discovery/ZigStepDiscoveryListener.kt

@@ -30,6 +30,7 @@ interface ZigStepDiscoveryListener {
 
     enum class ErrorType {
         MissingToolchain,
+        MissingZigExe,
         MissingBuildZig,
         GeneralError
     }

core/src/main/kotlin/com/falsepattern/zigbrains/project/steps/discovery/ZigStepDiscoveryService.kt

@@ -85,7 +85,9 @@ class ZigStepDiscoveryService(private val project: Project) {
             "build", "-l",
             timeoutMillis = currentTimeoutSec * 1000L
         )
-        if (result.checkSuccess(LOG)) {
+        if (result == null) {
+            errorReload(ErrorType.MissingZigExe)
+        } else if (result.checkSuccess(LOG)) {
             currentTimeoutSec = DEFAULT_TIMEOUT_SEC
             val lines = result.stdoutLines
             val steps = ArrayList<Pair<String, String?>>()

core/src/main/kotlin/com/falsepattern/zigbrains/project/steps/ui/BuildToolWindowContext.kt

@@ -166,6 +166,7 @@ class BuildToolWindowContext(private val project: Project): Disposable {
             withEDTContext {
                 getViewport(project)?.setViewportError(ZigBrainsBundle.message(when(type) {
                     ZigStepDiscoveryListener.ErrorType.MissingToolchain -> "build.tool.window.status.error.missing-toolchain"
+                    ZigStepDiscoveryListener.ErrorType.MissingZigExe -> "build.tool.window.status.error.missing-zig-exe"
                     ZigStepDiscoveryListener.ErrorType.MissingBuildZig -> "build.tool.window.status.error.missing-build-zig"
                     ZigStepDiscoveryListener.ErrorType.GeneralError -> "build.tool.window.status.error.general"
                 }), details)

core/src/main/kotlin/com/falsepattern/zigbrains/project/toolchain/tools/ZigCompilerTool.kt

@@ -38,7 +38,7 @@ class ZigCompilerTool(toolchain: AbstractZigToolchain) : ZigTool(toolchain) {
     }
 
     suspend fun getEnv(project: Project?): ZigToolchainEnvironmentSerializable? {
-        val stdout = callWithArgs(toolchain.workingDirectory(project), "env").stdout
+        val stdout = callWithArgs(toolchain.workingDirectory(project), "env")?.stdout ?: return null
         return try {
             envJson.decodeFromString<ZigToolchainEnvironmentSerializable>(stdout)
         } catch (e: SerializationException) {

core/src/main/kotlin/com/falsepattern/zigbrains/project/toolchain/tools/ZigTool.kt

@@ -31,12 +31,13 @@ import kotlinx.coroutines.runInterruptible
 import kotlinx.coroutines.withContext
 import kotlinx.coroutines.withTimeoutOrNull
 import java.nio.file.Path
+import kotlin.io.path.isRegularFile
 
 abstract class ZigTool(val toolchain: AbstractZigToolchain) {
     abstract val toolName: String
 
-    suspend fun callWithArgs(workingDirectory: Path?, vararg parameters: String, timeoutMillis: Long = Long.MAX_VALUE): ProcessOutput {
-        val cli = createBaseCommandLine(workingDirectory, *parameters)
+    suspend fun callWithArgs(workingDirectory: Path?, vararg parameters: String, timeoutMillis: Long = Long.MAX_VALUE): ProcessOutput? {
+        val cli = createBaseCommandLine(workingDirectory, *parameters) ?: return null
 
         val (process, exitCode) = withContext(Dispatchers.IO) {
             val process = cli.createProcess()
@@ -59,9 +60,12 @@ abstract class ZigTool(val toolchain: AbstractZigToolchain) {
     private suspend fun createBaseCommandLine(
         workingDirectory: Path?,
         vararg parameters: String
-    ): GeneralCommandLine {
+    ): GeneralCommandLine? {
+        val exe = toolchain.pathToExecutable(toolName)
+        if (!exe.isRegularFile())
+            return null
         val cli = GeneralCommandLine()
-            .withExePath(toolchain.pathToExecutable(toolName).toString())
+            .withExePath(exe.toString())
             .withWorkingDirectory(workingDirectory)
             .withParameters(*parameters)
             .withCharset(Charsets.UTF_8)

core/src/main/resources/zigbrains/Bundle.properties

@@ -113,6 +113,7 @@ build.tool.window.status.not-scanned=Build steps not yet scanned. Click the refr
 build.tool.window.status.loading=Running zig build -l
 build.tool.window.status.error.missing-build-zig=No build.zig file found
 build.tool.window.status.error.missing-toolchain=No zig toolchain configured
+build.tool.window.status.error.missing-zig-exe=Zig executable missing
 build.tool.window.status.error.general=Error while running zig build -l
 build.tool.window.status.timeout=zig build -l timed out after {0} seconds.
 zig=Zig