feat(global): add a shell-like prompt for interfacing with the server during operation

1 files changed, 98 insertions, 0 deletions

diff --git a/src/prompt/mod.rs b/src/prompt/mod.rs
new file mode 100644
index 0000000..a1329bf
--- /dev/null
+++ b/src/prompt/mod.rs
@@ -0,0 +1,98 @@
+// Copyleft (ɔ) 2021-2021 The Whirlsplash Collective
+// SPDX-License-Identifier: GPL-3.0-only
+
+mod builtins;
+mod structure;
+
+use std::{io, io::Write, str::FromStr};
+
+use crate::prompt::{
+  builtins::{builtin_echo, BuiltIn},
+  structure::Command,
+};
+
+pub struct Prompt;
+impl Prompt {
+  pub fn handle() {
+    Prompt::write_prompt();
+    Prompt::process_command(Prompt::tokenize_command(Prompt::read_command()));
+  }
+
+  fn write_prompt() {
+    print!("> ");
+    io::stdout().flush().unwrap();
+  }
+
+  fn read_command() -> String {
+    let mut input = String::new();
+    io::stdin()
+      .read_line(&mut input)
+      .expect("failed to read command from stdin");
+
+    input
+  }
+
+  fn tokenize_command(c: String) -> Command {
+    let mut command_split: Vec<String> = c.split_whitespace().map(|s| s.to_string()).collect();
+
+    Command {
+      keyword: command_split.remove(0),
+      args:    command_split,
+    }
+  }
+
+  fn process_command(c: Command) -> i32 {
+    match BuiltIn::from_str(&c.keyword) {
+      Ok(BuiltIn::Echo) => builtin_echo(&c.args),
+      Ok(BuiltIn::Exit) => std::process::exit(0),
+      _ => {
+        println!("{}: command not found", &c.keyword);
+        1
+      }
+    }
+  }
+}
+
+#[cfg(test)]
+mod tokenize_command {
+  use crate::prompt::Prompt;
+
+  #[test]
+  #[ignore]
+  fn empty_command() { assert_eq!("", Prompt::tokenize_command("".to_string()).keyword) }
+
+  #[test]
+  fn test_keyword() { assert_eq!("test", Prompt::tokenize_command("test".to_string()).keyword) }
+
+  #[test]
+  fn no_arg() { assert_eq!(0, Prompt::tokenize_command("test".to_string()).args.len()) }
+
+  #[test]
+  fn one_arg() {
+    assert_eq!(
+      1,
+      Prompt::tokenize_command("test one".to_string()).args.len()
+    )
+  }
+
+  #[test]
+  fn multi_arg() {
+    assert_eq!(
+      3,
+      Prompt::tokenize_command("test one two three".to_string())
+        .args
+        .len()
+    )
+  }
+
+  #[test]
+  #[ignore]
+  fn quotes() {
+    assert_eq!(
+      2,
+      Prompt::tokenize_command("test \"one two\" three".to_string())
+        .args
+        .len()
+    )
+  }
+}