3 files changed, 100 insertions, 2 deletions
diff --git a/src/jsMain/kotlin/moe/nea89/website/KFiles.kt b/src/jsMain/kotlin/moe/nea89/website/KFiles.kt
index aad3036..d5eff5a 100644
--- a/src/jsMain/kotlin/moe/nea89/website/KFiles.kt
+++ b/src/jsMain/kotlin/moe/nea89/website/KFiles.kt
@@ -151,10 +151,11 @@ class FileSystemBuilder {
     }
 }
 
-suspend fun ShellExecutionContext.requireFileAccessor(): FileAccessor {
+suspend fun ShellExecutionContext.requireFileAccessor(error: String? = "There is no file accessor present :("): FileAccessor {
     val fa = console.fileAccessor
     if (fa == null) {
-        console.addLine("There is no file accessor present :(")
+        if (error != null)
+            console.addLine(error)
         exit()
     }
     return fa
diff --git a/src/jsMain/kotlin/moe/nea89/website/ShellExecutionContext.kt b/src/jsMain/kotlin/moe/nea89/website/ShellExecutionContext.kt
index bd72421..b3a7bd8 100644
--- a/src/jsMain/kotlin/moe/nea89/website/ShellExecutionContext.kt
+++ b/src/jsMain/kotlin/moe/nea89/website/ShellExecutionContext.kt
@@ -13,6 +13,7 @@ class ShellExecutionContext(
 ) {
 
     suspend fun wait(duration: Duration) {
+        if (!duration.isPositive()) return
         suspendCancellableCoroutine<Unit> {
             window.setTimeout({
                 it.resume(Unit)
diff --git a/src/jsMain/kotlin/moe/nea89/website/defaultCommands.kt b/src/jsMain/kotlin/moe/nea89/website/defaultCommands.kt
new file mode 100644
index 0000000..2c90dc2
--- /dev/null
+++ b/src/jsMain/kotlin/moe/nea89/website/defaultCommands.kt
@@ -0,0 +1,96 @@
+package moe.nea89.website
+
+import kotlinx.browser.document
+import kotlinx.html.dom.create
+import kotlinx.html.img
+import kotlinx.html.js.a
+import kotlinx.html.js.onLoadFunction
+import kotlinx.html.js.p
+import kotlin.time.Duration
+import kotlin.time.Duration.Companion.milliseconds
+
+fun defaultCwdCommand(name: String, vararg names: String) = command(name, *names) {
+    val fa = requireFileAccessor()
+    console.addLine(fa.currentDir.joinToString(separator = "/", prefix = "/"))
+}
+
+fun defaultCdCommand(name: String, vararg names: String) = command(name, *names) {
+    val fa = requireFileAccessor()
+    val path = args.singleOrNull()
+    if (path == null) {
+        console.addLine("Usage: cd <directory>")
+        return@command
+    }
+    val error = fa.cd(path)
+    if (error != null) {
+        console.addLine("cd: ${error.name}")
+    }
+}
+
+fun defaultCatCommand(name: String, vararg names: String) = command(name, *names) {
+    val fa = requireFileAccessor()
+    val path = when (args.size) {
+        1 -> args[0]
+        else -> {
+            console.addLine("Usage: cat [directory or file]")
+            return@command
+        }
+    }
+    val file = fa.resolve(path)
+    if (file == null) {
+        console.addLine("cat: Could not find file or directory")
+        return@command
+    }
+    when (file) {
+        is KFile.Directory -> console.addLine("cat: Is a directory")
+        is KFile.Text -> console.addMultilineText(file.text)
+        is KFile.Image -> console.addLine(document.create.p {
+            img(src = file.url) {
+                this.onLoadFunction = { console.scrollDown() }
+            }
+        })
+
+        is KFile.Download -> {
+            val link = document.create.a(file.url)
+            link.download = file.name.last()
+            document.body!!.append(link)
+            link.click()
+            link.remove()
+            console.addLine("Download started")
+        }
+    }
+}
+
+
+fun defaultLsCommand(name: String, vararg names: String, delayBetweenLines: Duration = 200.milliseconds) =
+    command(name, *names) {
+        val fa = requireFileAccessor()
+        val path = when (args.size) {
+            0 -> "."
+            1 -> args[0]
+            else -> {
+                console.addLine("Usage: ls [directory or file]")
+                return@command
+            }
+        }
+        val file = fa.resolve(path)
+        if (file == null) {
+            console.addLine("ls: Could not find file or directory")
+            return@command
+        }
+        when (file) {
+            is KFile.Directory -> {
+                val longestName = file.files.keys.maxOf { it.length }
+                file.files.forEach { (name, file) ->
+                    wait(delayBetweenLines)
+                    console.addLine(
+                        name + " ".repeat(longestName + 1 - name.length) + file.fileType
+                    )
+                    console.rerender()
+                }
+            }
+
+            else -> console.addLine("ls: is a ${file.fileType}")
+        }
+    }
+