Add current working directory tracking to Context

Signed-off-by: Manos Pitsidianakis <manos@pitsidianak.is>

meli/src/command/actions.rs

@@ -121,6 +121,8 @@ pub enum Action {
     View(ViewAction),
     SetEnv(String, String),
     PrintEnv(String),
+    CurrentDirectory,
+    ChangeCurrentDirectory(PathBuf),
     Compose(ComposeAction),
     Mailbox(AccountName, MailboxOperation),
     AccountAction(AccountName, AccountAction),

meli/src/command/parser.rs

@@ -136,7 +136,7 @@ pub fn parse_command(input: &[u8]) -> Result<Action, CommandError> {
         close,
         mailinglist,
         setenv,
-        printenv,
+        alt((printenv, currentdir, change_currentdir)),
         view,
         create_mailbox,
         sub_mailbox,
@@ -401,6 +401,25 @@ pub fn printenv(input: &[u8]) -> IResult<&[u8], Result<Action, CommandError>> {
     let (input, _) = eof(input)?;
     Ok((input, Ok(PrintEnv(key.to_string()))))
 }
+pub fn currentdir(input: &[u8]) -> IResult<&[u8], Result<Action, CommandError>> {
+    let mut check = arg_init! { min_arg:0, max_arg: 0, currentdir};
+    let (input, _) = tag("cwd")(input.ltrim())?;
+    arg_chk!(start check, input);
+    arg_chk!(finish check, input);
+    let (input, _) = eof(input)?;
+    Ok((input, Ok(CurrentDirectory)))
+}
+pub fn change_currentdir(input: &[u8]) -> IResult<&[u8], Result<Action, CommandError>> {
+    let mut check = arg_init! { min_arg:1, max_arg: 1, change_currentdir};
+    let (input, _) = tag("cd")(input.ltrim())?;
+    arg_chk!(start check, input);
+    let (input, _) = is_a(" ")(input)?;
+    arg_chk!(inc check, input);
+    let (input, d) = map_res(not_line_ending, std::str::from_utf8)(input.trim())?;
+    arg_chk!(finish check, input);
+    let (input, _) = eof(input)?;
+    Ok((input, Ok(ChangeCurrentDirectory(d.into()))))
+}
 pub fn mailto(input: &[u8]) -> IResult<&[u8], Result<Action, CommandError>> {
     let mut check = arg_init! { min_arg:1, max_arg: 1, mailto};
     use melib::email::parser::generic::mailto as parser;

meli/src/state.rs

@@ -34,7 +34,14 @@
 //! for user input, observe folders for file changes etc. The relevant struct is
 //! [`ThreadEvent`].
 
-use std::{collections::BTreeSet, env, os::unix::io::RawFd, sync::Arc, thread};
+use std::{
+    collections::BTreeSet,
+    env,
+    os::unix::io::RawFd,
+    path::{Path, PathBuf},
+    sync::Arc,
+    thread,
+};
 
 use crossbeam::channel::{unbounded, Receiver, Sender};
 use indexmap::{IndexMap, IndexSet};
@@ -133,6 +140,7 @@ pub struct Context {
     pub main_loop_handler: MainLoopHandler,
     receiver: Receiver<ThreadEvent>,
     input_thread: InputHandler,
+    current_dir: PathBuf,
     pub children: Vec<std::process::Child>,
 
     pub temp_files: Vec<File>,
@@ -241,6 +249,7 @@ impl Context {
             realized: IndexMap::default(),
             unrealized: IndexSet::default(),
             temp_files: Vec::new(),
+            current_dir: std::env::current_dir().unwrap(),
             children: vec![],
 
             input_thread: InputHandler {
@@ -257,6 +266,10 @@ impl Context {
             receiver,
         }
     }
+
+    pub fn current_dir(&self) -> &Path {
+        &self.current_dir
+    }
 }
 
 /// A State object to manage and own components and components of the UI.
@@ -434,6 +447,7 @@ impl State {
                 realized: IndexMap::default(),
                 unrealized: IndexSet::default(),
                 temp_files: Vec::new(),
+                current_dir: std::env::current_dir()?,
                 children: vec![],
 
                 input_thread: InputHandler {
@@ -863,6 +877,21 @@ impl State {
                         env::var(key.as_str()).unwrap_or_else(|e| e.to_string()),
                     )));
             }
+            ChangeCurrentDirectory(dir) => {
+                self.context.current_dir = dir;
+                self.context
+                    .replies
+                    .push_back(UIEvent::StatusEvent(StatusEvent::DisplayMessage(
+                        self.context.current_dir.display().to_string(),
+                    )));
+            }
+            CurrentDirectory => {
+                self.context
+                    .replies
+                    .push_back(UIEvent::StatusEvent(StatusEvent::DisplayMessage(
+                        self.context.current_dir.display().to_string(),
+                    )));
+            }
             Mailbox(account_name, op) => {
                 if let Some(account) = self
                     .context