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Yehuda Katz 2019-05-10 09:59:12 -07:00
commit 8f3b273337
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16
Cargo.toml Normal file
View File

@ -0,0 +1,16 @@
[package]
name = "objectshell"
version = "0.1.0"
authors = ["Yehuda Katz <wycats@gmail.com>"]
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
rustyline = "4.0.0"
sysinfo = "0.8.3"
chrono = "0.4.6"
chrono-tz = "0.5.1"
derive-new = "0.5.6"
prettytable-rs = "0.8.0"
itertools = "0.8.0"

7
history.txt Normal file
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@ -0,0 +1,7 @@
hello
ps
ls
ps
ls
ps
ls

3
src/commands.rs Normal file
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@ -0,0 +1,3 @@
crate mod command;
crate mod ls;
crate mod ps;

10
src/commands/command.rs Normal file
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@ -0,0 +1,10 @@
use crate::errors::ShellError;
use crate::object::Value;
pub trait Command {
fn run(
&mut self,
host: &dyn crate::Host,
env: &mut crate::Environment,
) -> Result<Value, ShellError>;
}

28
src/commands/ls.rs Normal file
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@ -0,0 +1,28 @@
use crate::errors::ShellError;
use crate::object::process::Process;
use crate::object::{DirEntry, ShellObject, Value};
use derive_new::new;
use sysinfo::SystemExt;
#[derive(new)]
pub struct Ls;
impl crate::Command for Ls {
fn run(
&mut self,
_host: &dyn crate::Host,
env: &mut crate::Environment,
) -> Result<Value, ShellError> {
let entries =
std::fs::read_dir(env.cwd()).map_err((|e| ShellError::new(format!("{:?}", e))))?;
let mut shell_entries = vec![];
for entry in entries {
let value = Value::object(DirEntry::new(entry?)?);
shell_entries.push(value)
}
Ok(Value::list(shell_entries))
}
}

30
src/commands/ps.rs Normal file
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@ -0,0 +1,30 @@
use crate::errors::ShellError;
use crate::object::process::Process;
use crate::object::{ShellObject, Value};
use derive_new::new;
use sysinfo::SystemExt;
#[derive(new)]
pub struct Ps {
system: sysinfo::System,
}
impl crate::Command for Ps {
fn run(
&mut self,
_host: &dyn crate::Host,
_env: &mut crate::Environment,
) -> Result<Value, ShellError> {
self.system.refresh_all();
let list = self.system.get_process_list();
let list = list
.into_iter()
.map(|(_, process)| Value::Object(Box::new(Process::new(process.clone()))))
.take(5)
.collect();
Ok(Value::List(list))
}
}

5
src/env.rs Normal file
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@ -0,0 +1,5 @@
crate mod environment;
crate mod host;
crate use self::environment::Environment;
crate use self::host::Host;

17
src/env/environment.rs vendored Normal file
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@ -0,0 +1,17 @@
use std::path::{Path, PathBuf};
pub struct Environment {
cwd: PathBuf,
}
impl Environment {
pub fn basic() -> Result<Environment, std::io::Error> {
let cwd = std::env::current_dir()?;
Ok(Environment { cwd })
}
pub fn cwd(&self) -> &Path {
self.cwd.as_path()
}
}

11
src/env/host.rs vendored Normal file
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@ -0,0 +1,11 @@
pub trait Host {
fn stdout(&mut self, out: &str);
}
crate struct BasicHost;
impl Host for BasicHost {
fn stdout(&mut self, out: &str) {
println!("{}", out)
}
}

22
src/errors.rs Normal file
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@ -0,0 +1,22 @@
use derive_new::new;
#[derive(Debug, new)]
pub struct ShellError {
title: String,
}
impl std::fmt::Display for ShellError {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", &self.title)
}
}
impl std::error::Error for ShellError {}
impl std::convert::From<std::io::Error> for ShellError {
fn from(input: std::io::Error) -> ShellError {
ShellError {
title: format!("{}", input),
}
}
}

16
src/format.rs Normal file
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@ -0,0 +1,16 @@
crate mod entries;
crate mod generic;
crate mod list;
crate mod table;
use crate::object::Value;
use crate::Host;
crate use entries::EntriesView;
crate use generic::GenericView;
crate use list::ListView;
crate use table::TableView;
crate trait RenderView {
fn render_view(&self, host: &dyn Host) -> Vec<String>;
}

28
src/format/entries.rs Normal file
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@ -0,0 +1,28 @@
use crate::format::RenderView;
use crate::Host;
use derive_new::new;
// An entries list is printed like this:
//
// name : ...
// name2 : ...
// another_name : ...
#[derive(new)]
pub struct EntriesView {
entries: Vec<(String, String)>,
}
impl RenderView for EntriesView {
fn render_view(&self, host: &dyn Host) -> Vec<String> {
if self.entries.len() == 0 {
return vec![];
}
let max_name_size: usize = self.entries.iter().map(|(n, _)| n.len()).max().unwrap();
self.entries
.iter()
.map(|(k, v)| format!("{:width$} : {}", k, v, width = max_name_size))
.collect()
}
}

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use crate::format::{RenderView, TableView};
use crate::object::base::ToEntriesView;
use crate::object::Value;
use crate::Host;
use derive_new::new;
// A list is printed one line at a time with an optional separator between groups
#[derive(new)]
pub struct GenericView<'value> {
value: &'value Value,
}
impl RenderView for GenericView<'value> {
fn render_view(&self, host: &dyn Host) -> Vec<String> {
match self.value {
Value::Primitive(p) => vec![p.format()],
Value::List(l) => {
let view = TableView::from_list(l);
if let Some(view) = view {
view.render_view(host)
} else {
vec![]
}
// let mut list: Vec<String> = vec![];
// for item in l {
// match item {
// Value::Primitive(p) => list.push(p.format()),
// Value::List(l) => list.push(format!("{:?}", l)),
// Value::Object(o) => {
// let view = o.to_entries_view();
// let out = view.render_view(host);
// list.extend(out);
// }
// }
// list.push("\n".to_string());
// }
// list
}
Value::Object(o) => {
let view = o.to_entries_view();
let out = view.render_view(host);
out
}
}
}
}

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use crate::format::RenderView;
use crate::Host;
use derive_new::new;
// A list is printed one line at a time with an optional separator between groups
#[derive(new)]
pub struct ListView {
list: Vec<Vec<String>>,
sep: String,
}
impl RenderView for ListView {
fn render_view(&self, host: &dyn Host) -> Vec<String> {
let mut out = vec![];
for output in &self.list {
let string: String = output.iter().map(|l| format!("{}\n", l)).collect();
out.push(format!("{}{}", string, self.sep));
}
out
}
}

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use crate::format::RenderView;
use crate::object::ShellObject;
use crate::object::Value;
use crate::Host;
use derive_new::new;
use prettytable::{Cell, Row, Table};
// An entries list is printed like this:
//
// name : ...
// name2 : ...
// another_name : ...
#[derive(new)]
pub struct TableView {
headers: Vec<String>,
entries: Vec<Vec<String>>,
}
impl TableView {
pub fn from_list(values: &[Value]) -> Option<TableView> {
if values.len() == 0 {
return None;
}
let item = &values[0];
let descs = item.data_descriptors();
let headers = descs.iter().map(|d| d.name.clone()).collect();
let mut entries = vec![];
for value in values {
let row = descs
.iter()
.map(|d| value.get_data(d).borrow().format_leaf())
.collect();
entries.push(row);
}
Some(TableView { headers, entries })
}
}
impl RenderView for TableView {
fn render_view(&self, host: &dyn Host) -> Vec<String> {
if self.entries.len() == 0 {
return vec![];
}
let mut table = Table::new();
let header: Vec<Cell> = self.headers.iter().map(|h| Cell::new(h)).collect();
table.add_row(Row::new(header));
for row in &self.entries {
table.add_row(Row::new(row.iter().map(|h| Cell::new(h)).collect()));
}
let mut out = vec![];
table.print(&mut out).unwrap();
vec![String::from_utf8_lossy(&out).to_string()]
}
}

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#![feature(crate_visibility_modifier)]
#![feature(in_band_lifetimes)]
#![allow(unused)]
mod commands;
mod env;
mod errors;
mod format;
mod object;
crate use crate::commands::command::Command;
crate use crate::env::{Environment, Host};
crate use crate::format::RenderView;
use crate::object::base::{ToEntriesView, ToGenericView};
use rustyline::error::ReadlineError;
use rustyline::Editor;
use std::collections::BTreeMap;
use std::error::Error;
use sysinfo::{self, SystemExt};
#[derive(Debug)]
pub enum MaybeOwned<'a, T> {
Owned(T),
Borrowed(&'a T),
}
impl<T> MaybeOwned<'a, T> {
crate fn borrow(&self) -> &T {
match self {
MaybeOwned::Owned(v) => v,
MaybeOwned::Borrowed(v) => v,
}
}
}
fn main() -> Result<(), Box<Error>> {
let mut rl = Editor::<()>::new();
if rl.load_history("history.txt").is_err() {
println!("No previous history.");
}
let mut host = crate::env::host::BasicHost;
let mut env = crate::Environment::basic()?;
let mut commands = BTreeMap::<String, Box<dyn crate::Command>>::new();
let mut system = sysinfo::System::new();
let mut ps = crate::commands::ps::Ps::new(system);
let mut ls = crate::commands::ls::Ls;
commands.insert("ps".to_string(), Box::new(ps));
commands.insert("ls".to_string(), Box::new(ls));
loop {
let readline = rl.readline(">> ");
match readline {
Ok(line) => {
rl.add_history_entry(line.as_ref());
match commands.get_mut(&line) {
Some(command) => {
let result = command.run(&mut host, &mut env).unwrap();
let view = result.to_generic_view();
let rendered = view.render_view(&mut host);
for line in rendered {
match line.as_ref() {
"\n" => println!(""),
line => println!("{}", line),
}
}
}
_ => println!("Saw: {}", line),
}
}
Err(ReadlineError::Interrupted) => {
println!("CTRL-C");
break;
}
Err(ReadlineError::Eof) => {
println!("CTRL-D");
break;
}
Err(err) => {
println!("Error: {:?}", err);
break;
}
}
}
rl.save_history("history.txt").unwrap();
Ok(())
}

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crate mod base;
crate mod desc;
crate mod dict;
crate mod files;
crate mod process;
crate mod types;
crate use base::{Primitive, ShellObject, Value};
crate use desc::{DataDescriptor, DataDescriptorInstance};
crate use dict::Dictionary;
crate use files::DirEntry;

134
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use crate::format::{EntriesView, GenericView};
use crate::object::desc::DataDescriptor;
use chrono::NaiveDateTime;
use std::fmt::Debug;
#[derive(Debug)]
pub enum Primitive {
Nothing,
Int(i64),
Float(f64),
String(String),
Boolean(bool),
Date(NaiveDateTime),
}
impl Primitive {
crate fn format(&self) -> String {
match self {
Primitive::Nothing => format!("Nothing"),
Primitive::Int(i) => format!("{}", i),
Primitive::Float(f) => format!("{}", f),
Primitive::String(s) => format!("{:?}", s),
Primitive::Boolean(b) => format!("{:?}", b),
Primitive::Date(d) => format!("{}", d),
}
}
}
#[derive(Debug)]
pub enum Value {
Primitive(Primitive),
Object(Box<dyn ShellObject>),
List(Vec<Value>),
}
impl ShellObject for Value {
fn to_shell_string(&self) -> String {
match self {
Value::Primitive(p) => p.format(),
Value::Object(o) => o.to_shell_string(),
Value::List(l) => format!("[list List]"),
}
}
fn data_descriptors(&self) -> Vec<DataDescriptor> {
match self {
Value::Primitive(p) => vec![],
Value::Object(o) => o.data_descriptors(),
Value::List(l) => vec![],
}
}
fn get_data(&'a self, desc: &DataDescriptor) -> crate::MaybeOwned<'a, Value> {
match self {
Value::Primitive(p) => crate::MaybeOwned::Owned(Value::nothing()),
Value::Object(o) => o.get_data(desc),
Value::List(l) => crate::MaybeOwned::Owned(Value::nothing()),
}
}
}
impl Value {
crate fn format_leaf(&self) -> String {
match self {
Value::Primitive(p) => p.format(),
Value::Object(o) => format!("[object Object]"),
Value::List(l) => format!("[list List]"),
}
}
crate fn string(s: impl Into<String>) -> Value {
Value::Primitive(Primitive::String(s.into()))
}
crate fn int(s: impl Into<i64>) -> Value {
Value::Primitive(Primitive::Int(s.into()))
}
crate fn boolean(s: impl Into<bool>) -> Value {
Value::Primitive(Primitive::Boolean(s.into()))
}
crate fn nothing() -> Value {
Value::Primitive(Primitive::Nothing)
}
crate fn list(values: impl Into<Vec<Value>>) -> Value {
Value::List(values.into())
}
crate fn object(value: impl ShellObject + 'static) -> Value {
Value::Object(Box::new(value))
}
}
pub trait ShellObject: Debug {
fn to_shell_string(&self) -> String;
fn data_descriptors(&self) -> Vec<DataDescriptor>;
fn get_data(&'a self, desc: &DataDescriptor) -> crate::MaybeOwned<'a, Value>;
}
pub trait ToEntriesView {
fn to_entries_view(&self) -> EntriesView;
}
impl ToEntriesView for ShellObject {
fn to_entries_view(&self) -> EntriesView {
let descs = self.data_descriptors();
let mut entries = vec![];
for desc in descs {
let value = self.get_data(&desc);
let formatted_value = match value.borrow() {
Value::Primitive(p) => p.format(),
Value::Object(o) => format!("[object Object]"),
Value::List(l) => format!("[object List]"),
};
entries.push((desc.name.clone(), formatted_value))
}
EntriesView::new(entries)
}
}
pub trait ToGenericView {
fn to_generic_view(&self) -> GenericView;
}
impl ToGenericView for Value {
fn to_generic_view(&self) -> GenericView<'_> {
GenericView::new(self)
}
}

25
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use crate::object::types::{Any, Type};
use derive_new::new;
#[derive(new)]
pub struct DataDescriptor {
crate name: String,
crate readonly: bool,
crate ty: Box<dyn Type>,
}
impl DataDescriptor {
crate fn any(name: impl Into<String>) -> DataDescriptor {
DataDescriptor {
name: name.into(),
readonly: true,
ty: Box::new(Any),
}
}
}
#[derive(new)]
pub struct DataDescriptorInstance<'desc> {
desc: &'desc DataDescriptor,
value: crate::object::base::Value,
}

73
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use crate::object::desc::DataDescriptor;
use crate::object::{Primitive, Value};
use crate::MaybeOwned;
use derive_new::new;
use std::cell::RefCell;
use std::collections::BTreeMap;
use std::rc::Rc;
#[derive(Debug, Default)]
pub struct Dictionary {
entries: BTreeMap<String, Value>,
}
impl Dictionary {
crate fn add(&mut self, name: impl Into<String>, value: Value) {
self.entries.insert(name.into(), value);
}
}
impl crate::object::ShellObject for Dictionary {
fn to_shell_string(&self) -> String {
format!("[object Object] lol")
}
fn data_descriptors(&self) -> Vec<DataDescriptor> {
self.entries
.iter()
.map(|(name, value)| {
DataDescriptor::new(name.clone(), true, Box::new(crate::object::types::Any))
})
.collect()
}
fn get_data(&'a self, desc: &DataDescriptor) -> MaybeOwned<'a, Value> {
match self.entries.get(&desc.name) {
Some(v) => MaybeOwned::Borrowed(v),
None => MaybeOwned::Owned(Value::Primitive(Primitive::Nothing)),
}
}
}
#[derive(Debug, Default)]
pub struct ScopedDictionary<'parent> {
entries: BTreeMap<String, MaybeOwned<'parent, Value>>,
}
impl ScopedDictionary<'parent> {
crate fn add(&mut self, name: impl Into<String>, value: impl Into<MaybeOwned<'parent, Value>>) {
self.entries.insert(name.into(), value.into());
}
}
impl crate::object::ShellObject for ScopedDictionary<'parent> {
fn to_shell_string(&self) -> String {
format!("[object Object] lol")
}
fn data_descriptors(&self) -> Vec<DataDescriptor> {
self.entries
.iter()
.map(|(name, value)| {
DataDescriptor::new(name.clone(), true, Box::new(crate::object::types::Any))
})
.collect()
}
fn get_data(&'a self, desc: &DataDescriptor) -> MaybeOwned<'a, Value> {
match self.entries.get(&desc.name) {
Some(v) => MaybeOwned::Borrowed(v.borrow()),
None => MaybeOwned::Owned(Value::Primitive(Primitive::Nothing)),
}
}
}

57
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use crate::errors::ShellError;
use crate::object::{DataDescriptor, Dictionary, ShellObject, Value};
use crate::MaybeOwned;
#[derive(Debug)]
pub struct DirEntry {
inner: std::fs::DirEntry,
dict: Dictionary,
}
#[derive(Debug)]
pub enum FileType {
Dir,
File,
Symlink,
}
impl DirEntry {
crate fn new(inner: std::fs::DirEntry) -> Result<DirEntry, ShellError> {
let mut dict = Dictionary::default();
let filename = inner.file_name();
dict.add("file_name", Value::string(filename.to_string_lossy()));
let metadata = inner.metadata()?;
// let file_type = inner.file_type()?;
let kind = if metadata.is_dir() {
FileType::Dir
} else if metadata.is_file() {
FileType::File
} else {
FileType::Symlink
};
dict.add("file_type", Value::string(format!("{:?}", kind)));
dict.add(
"readonly",
Value::boolean(metadata.permissions().readonly()),
);
Ok(DirEntry { inner, dict })
}
}
impl ShellObject for DirEntry {
fn to_shell_string(&self) -> String {
format!("[object DirEntry]")
}
fn data_descriptors(&self) -> Vec<DataDescriptor> {
self.dict.data_descriptors()
}
fn get_data(&'a self, desc: &DataDescriptor) -> MaybeOwned<'a, Value> {
self.dict.get_data(desc)
}
}

0
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48
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use crate::object::base::{Primitive, ShellObject, Value};
use crate::object::desc::DataDescriptor;
use crate::object::dict::Dictionary;
use crate::MaybeOwned;
use derive_new::new;
use itertools::join;
use sysinfo::ProcessExt;
#[derive(Debug)]
pub struct Process {
inner: sysinfo::Process,
dict: Dictionary,
}
impl Process {
crate fn new(inner: sysinfo::Process) -> Process {
let mut dict = Dictionary::default();
dict.add("name", Value::string(inner.name()));
let cmd = inner.cmd();
let cmd_value = if cmd.len() == 0 {
Value::nothing()
} else {
Value::string(join(cmd, ""))
};
dict.add("cmd", cmd_value);
dict.add("pid", Value::int(inner.pid() as i64));
dict.add("status", Value::int(inner.status() as i64));
Process { inner, dict }
}
}
impl ShellObject for Process {
fn to_shell_string(&self) -> String {
format!("{} - {}", self.inner.name(), self.inner.pid())
}
fn data_descriptors(&self) -> Vec<DataDescriptor> {
self.dict.data_descriptors()
}
fn get_data(&'a self, desc: &DataDescriptor) -> MaybeOwned<'a, Value> {
self.dict.get_data(desc)
}
}

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pub trait Type {}
pub struct Any;
impl Type for Any {}