From 87e88a41cbc405e7f36c6eeb142b29f99bbcc8f1 Mon Sep 17 00:00:00 2001
From: Fuwn <fuwnzy@gmail.com>
Date: Tue, 15 Jun 2021 17:34:13 -0700
Subject: [PATCH] feat(prompt): create clear command

---
 crates/whirl_prompt/src/builtins/constants.rs  | 3 ++-
 crates/whirl_prompt/src/builtins/mod.rs        | 6 ++++++
 crates/whirl_prompt/src/builtins/structures.rs | 2 ++
 crates/whirl_prompt/src/lib.rs                 | 2 ++
 4 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/crates/whirl_prompt/src/builtins/constants.rs b/crates/whirl_prompt/src/builtins/constants.rs
index 15e7ff2d..1fad9ce2 100644
--- a/crates/whirl_prompt/src/builtins/constants.rs
+++ b/crates/whirl_prompt/src/builtins/constants.rs
@@ -2,8 +2,9 @@
 // SPDX-License-Identifier: GPL-3.0-only
 
 pub const FILES: [&str; 2] = ["README.rst", "Config.toml"];
-pub const HELPABLES_BUILTINS: [&str; 8] = [
+pub const HELPABLES_BUILTINS: [&str; 9] = [
   "cat     - display the contents of a present file",
+  "clear   - clear the display (standard out)",
   "config  - manipulate the configuration",
   "echo    - display a line of predefined text",
   "exit    - end the process",
diff --git a/crates/whirl_prompt/src/builtins/mod.rs b/crates/whirl_prompt/src/builtins/mod.rs
index 96a2c76a..59dbe485 100644
--- a/crates/whirl_prompt/src/builtins/mod.rs
+++ b/crates/whirl_prompt/src/builtins/mod.rs
@@ -106,3 +106,9 @@ pub fn builtin_fetch() -> i32 {
 
   0
 }
+
+pub fn builtin_clear() -> i32 {
+  println!("\x1B[2J\x1B[1;1H");
+
+  0
+}
diff --git a/crates/whirl_prompt/src/builtins/structures.rs b/crates/whirl_prompt/src/builtins/structures.rs
index 39d3510f..48eebaae 100644
--- a/crates/whirl_prompt/src/builtins/structures.rs
+++ b/crates/whirl_prompt/src/builtins/structures.rs
@@ -13,6 +13,7 @@ pub enum BuiltIn {
   Cat,
   Config,
   Fetch,
+  Clear,
 }
 impl FromStr for BuiltIn {
   type Err = ();
@@ -28,6 +29,7 @@ impl FromStr for BuiltIn {
       "cat" => Ok(Self::Cat),
       "config" => Ok(Self::Config),
       "fetch" => Ok(Self::Fetch),
+      "clear" => Ok(Self::Clear),
       _ => Err(()),
     }
   }
diff --git a/crates/whirl_prompt/src/lib.rs b/crates/whirl_prompt/src/lib.rs
index e2cafbbf..3da4840a 100644
--- a/crates/whirl_prompt/src/lib.rs
+++ b/crates/whirl_prompt/src/lib.rs
@@ -35,6 +35,7 @@ use whirl_config::Config;
 use crate::{
   builtins::{
     builtin_cat,
+    builtin_clear,
     builtin_config,
     builtin_echo,
     builtin_fetch,
@@ -106,6 +107,7 @@ impl Prompt {
       Ok(BuiltIn::Cat) => builtin_cat(&c.args),
       Ok(BuiltIn::Config) => builtin_config(&c.args),
       Ok(BuiltIn::Fetch) => builtin_fetch(),
+      Ok(BuiltIn::Clear) => builtin_clear(),
       _ => {
         println!("wsh: command not found: {}", &c.keyword);
         1