1 files changed, 69 insertions, 0 deletions
diff --git a/src/main/kotlin/me/kyren223/harpoonforjb/HarpoonState.kt b/src/main/kotlin/me/kyren223/harpoonforjb/HarpoonState.kt
new file mode 100644
index 0000000..75db721
--- /dev/null
+++ b/src/main/kotlin/me/kyren223/harpoonforjb/HarpoonState.kt
@@ -0,0 +1,69 @@
+package me.kyren223.harpoonforjb
+
+import com.intellij.ide.util.PropertiesComponent
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.LocalFileSystem
+import com.intellij.openapi.vfs.VirtualFile
+
+object HarpoonState {
+    private var previousIndex: Int? = null
+    private var currentIndex: Int? = null
+    private var nextIndex: Int? = null
+
+    private var projectFiles: MutableMap<String, MutableList<VirtualFile>> = mutableMapOf()
+    private val HARPOON_LIST_KEY = "HarpoonList"
+
+    fun setFile(project: Project, index: Int, file: VirtualFile) {
+        if (index < 0) return
+        loadProject(project)
+        val files = projectFiles[project.name]
+        if (files!!.size <= index) return
+        files[index] = file
+        saveProject(project)
+    }
+
+    fun appendFile(project: Project, file: VirtualFile) {
+        if (!file.isValid) return
+        loadProject(project)
+        val files = projectFiles[project.name]
+        files!!.add(file)
+        saveProject(project)
+    }
+
+    fun selectFile(project: Project, index: Int): VirtualFile? {
+        if (index < 0) return null
+        loadProject(project)
+        val files = projectFiles[project.name]
+        if (files!!.size <= index) return null
+        return files[index]
+    }
+
+    private fun loadProject(project: Project) {
+        if (project.name in projectFiles) return
+        val properties = PropertiesComponent.getInstance(project)
+        val list = properties.getList(HARPOON_LIST_KEY)
+        if (list == null) {
+            projectFiles[project.name] = mutableListOf()
+            return
+        }
+        val fs = LocalFileSystem.getInstance()
+        val files = list.stream()
+                .map { fs.findFileByPath(it) }
+                .toList()
+                .filterNotNull()
+                .filter { it.isValid }
+                .toMutableList()
+        projectFiles[project.name] = files
+    }
+
+    private fun saveProject(project: Project) {
+        if (project.name !in projectFiles) return
+        val files = projectFiles[project.name]
+        val properties = PropertiesComponent.getInstance(project)
+        val stringList = files!!.stream()
+                .filter { it.isValid }
+                .map { it.path }
+                .toList()
+        properties.setList(HARPOON_LIST_KEY, stringList)
+    }
+}
+\ No newline at end of file