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GPG Key ID:
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//! Graph inspection REPL
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use super::*;
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use std::{fmt, error};
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use std::path::PathBuf;
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use std::io;
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use rustyline::error::ReadlineError;
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use rustyline::Editor;
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/// Default history file name
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///
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/// # Path lookup
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/// * To make this an absolute path, start it with `/`
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/// * To make this path relative to the user's home directory, start it with `~/` (Note: If we are unable to find the user's home directory, it is considered a lookup **failure** (*not* a **disable**) and `calculate_history_path()` will return `Err`.)
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/// * Otherwise, the path is taken relative to the current working directory
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///
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/// # Notes
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/// This is only used when the `save-history` feature is enabled.
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const DEFAULT_HISTORY_FILE: &'static str = "~/.dirstat_history";
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/// Get the path to the history file.
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///
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/// # Lookup
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/// * If the `DIRSTAT_HISTORY` envvar is set and not empty, use this file path.
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/// * If the `DIRSTAT_HISTORY` envvar is set and empty, saving history is considered **disabled**, we return `Ok(None)`.
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/// * Otherwise, refer to lookup rules for `DEFAULT_HISTORY_FILE`.
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pub fn calculate_history_path() -> io::Result<Option<PathBuf>>
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{
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cfg_if! {
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if #[cfg(feature="save-history")] {
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todo!()
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} else {
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unreachable!("Tried to calculate repl history path when binary was compiled with history saving perma-disabled.")
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}
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}
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}
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/// Inspect the graph with commands
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pub fn inspect(cfg: &Config, graph: &HierarchicalINodeGraph) -> Result<(), ReplExitError>
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{
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let mut repl = Editor::<()>::new(); //TODO: Change `()` to our completer, when we have a decent idea of how they'll work.
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cfg_if! {
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if #[cfg(feature="save-history")] {
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let history_path = match calculate_history_path() {
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Ok(Some(path)) => {
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if let Err(err) = repl.load_history(&path)
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{
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cfg_eprintln!(cfg, "Failed to load repl history from {:?}: {}", path, err);
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}
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Some(path)
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},
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Ok(None) => None,
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Err(err)
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{
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cfg_eprintln!(cfg, "Failed to find repl history: {}", err);
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None
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}
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}
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}
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}
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let res: Result<(), ReplExitError> = try {
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loop {
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let line = repl.readline("> ")?;
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repl.add_history_entry(&line);
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//TODO: How to interpret commands?
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todo!("Interpret commands from `line`.");
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}
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};
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cfg_if! {
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if #[cfg(feature="save-history")] {
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if let Some(path) = history_path {
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if let Err(err) = repl.save_history(&path)
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{
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cfg_eprintln!(cfg, "Failed to save repl history to {:?}: {}", path, err);
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}
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}
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}
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}
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res
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}
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/// When the inspection repl exists abnormally.
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#[derive(Debug)]
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pub enum ReplExitError
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{
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ReadLine(ReadlineError),
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}
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impl From<ReadlineError> for ReplExitError
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{
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#[inline] fn from(from: ReadlineError) -> Self
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{
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Self::ReadLine(from)
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}
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}
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impl error::Error for ReplExitError
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{
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fn source(&self) -> Option<&(dyn error::Error + 'static)> {
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Some(match &self
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{
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Self::ReadLine(rl) => rl
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})
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}
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}
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impl fmt::Display for ReplExitError
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result
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{
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match self
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{
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Self::ReadLine(ReadlineError::Eof) |
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Self::ReadLine(ReadlineError::Interrupted) => write!(f, "exit"),
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Self::ReadLine(_) => write!(f, "readline error"),
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}
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}
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}
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