serialize mbox to json

src/input.rs

@@ -0,0 +1,80 @@
+use std::{
+    env, fmt,
+    fs::{remove_file, File},
+    io::{self, Read, Write},
+    process::Command,
+    result,
+};
+
+// Error wrapper
+
+#[derive(Debug)]
+pub enum Error {
+    IoError(io::Error),
+    GetEditorEnvVarNotFoundError(env::VarError),
+    AskForConfirmationDeniedError,
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "input: ")?;
+
+        match self {
+            Error::IoError(err) => err.fmt(f),
+            Error::GetEditorEnvVarNotFoundError(err) => err.fmt(f),
+            Error::AskForConfirmationDeniedError => write!(f, "action cancelled"),
+        }
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(err: io::Error) -> Error {
+        Error::IoError(err)
+    }
+}
+
+impl From<env::VarError> for Error {
+    fn from(err: env::VarError) -> Error {
+        Error::GetEditorEnvVarNotFoundError(err)
+    }
+}
+
+// Result wrapper
+
+type Result<T> = result::Result<T, Error>;
+
+// Utils
+
+pub fn open_editor_with_tpl(tpl: &[u8]) -> Result<String> {
+    // Creates draft file
+    let mut draft_path = env::temp_dir();
+    draft_path.push("himalaya-draft.mail");
+    File::create(&draft_path)?.write(tpl)?;
+
+    // Opens editor and saves user input to draft file
+    Command::new(env::var("EDITOR")?)
+        .arg(&draft_path)
+        .status()?;
+
+    // Extracts draft file content
+    let mut draft = String::new();
+    File::open(&draft_path)?.read_to_string(&mut draft)?;
+    remove_file(&draft_path)?;
+
+    Ok(draft)
+}
+
+pub fn ask_for_confirmation(prompt: &str) -> Result<()> {
+    print!("{} (y/n) ", prompt);
+    io::stdout().flush()?;
+
+    match io::stdin()
+        .bytes()
+        .next()
+        .and_then(|res| res.ok())
+        .map(|bytes| bytes as char)
+    {
+        Some('y') | Some('Y') => Ok(()),
+        _ => Err(Error::AskForConfirmationDeniedError),
+    }
+}