Basic pipelining is working!

history.txt

@@ -1,100 +0,0 @@
-cargo install cargo-edit
-ls
-ls | foo | bar
-ls
-ls | ap
-ls ab cd
-ls ab cd | de
-ls ab cd | grep 1243
-ls ab cd|grep 1243
-ls
-hello world
-hello world | zomg
-ls
-ls | zomgt
-ls | zomg
-ls soms
-ls something
-ls something | grep
-dir
-npm --help
-cd target
-dir
-ls
-cd target
-cd ..
-dir
-cd target
-cd ..
-cd target
-cd ..
-ls
-dir
-cd target
-ls
-cd ..
-ls
-cd target
-cd ..
-cd target
-cd ..
-cd target
-cd ..
-cd target
-cd ..
-cd target
-cd ..
-cd target
-cd ..
-cd target
-cd ..
-ls
-cd target
-cd ..
-cargo build
-cargo build --verbose
-ls
-cargo
-cargo build
-cargo run
-git status
-git add .
-git commit
-git push
-git status
-git add .
-git commit
-git push
-git config --global core.autocrlf input
-git config
-ls
-cd target
-ls
-cd target
-cd ..
-cd target
-ls
-git status
-git add .
-git commit
-git push
-cd target
-cd ..
-exit
-ls
-ps
-to-array
-exit
-ls
-dir
-ls
-cd target
-cd ..
-ps
-ls
-dir
-ls
-ls | to-array
-ls | format
-ls | to-array | format
-git status

src/commands.rs

@@ -3,6 +3,8 @@ crate mod cd;
 crate mod command;
 crate mod ls;
 crate mod ps;
+crate mod take;
 crate mod to_array;
 
 crate use command::Command;
+crate use to_array::to_array;

src/commands/command.rs

@@ -12,10 +12,12 @@ pub trait CommandBlueprint {
     ) -> Result<Box<dyn Command>, ShellError>;
 }
 
+#[derive(Debug)]
 pub enum CommandAction {
     ChangeCwd(PathBuf),
 }
 
+#[derive(Debug)]
 pub enum ReturnValue {
     Value(Value),
     Action(CommandAction),

src/commands/ps.rs

@@ -9,9 +9,7 @@ use std::rc::Rc;
 use sysinfo::SystemExt;
 
 #[derive(new)]
-pub struct PsBlueprint {
+pub struct PsBlueprint;
-    system: Rc<RefCell<sysinfo::System>>,
-}
 
 impl crate::CommandBlueprint for PsBlueprint {
     fn create(
@@ -20,18 +18,16 @@ impl crate::CommandBlueprint for PsBlueprint {
         host: &dyn crate::Host,
         env: &mut crate::Environment,
     ) -> Result<Box<dyn Command>, ShellError> {
-        Ok(Box::new(Ps::new(self.system.clone())))
+        Ok(Box::new(Ps::new()))
     }
 }
 
 #[derive(new)]
-pub struct Ps {
+pub struct Ps;
-    system: Rc<RefCell<sysinfo::System>>,
-}
 
 impl crate::Command for Ps {
     fn run(&mut self, stream: VecDeque<Value>) -> Result<VecDeque<ReturnValue>, ShellError> {
-        let mut system = self.system.borrow_mut();
+        let mut system = sysinfo::System::new();
         system.refresh_all();
 
         let list = system.get_process_list();
@@ -41,7 +37,6 @@ impl crate::Command for Ps {
             .map(|(_, process)| {
                 ReturnValue::Value(Value::Object(Box::new(Process::new(process.clone()))))
             })
-            .take(5)
             .collect::<VecDeque<_>>();
 
         Ok(list)

src/commands/take.rs

@@ -0,0 +1,51 @@
+use crate::errors::ShellError;
+use crate::object::process::Process;
+use crate::object::{DirEntry, ShellObject, Value};
+use crate::prelude::*;
+use crate::Args;
+use derive_new::new;
+use std::path::{Path, PathBuf};
+use sysinfo::SystemExt;
+
+#[derive(new)]
+pub struct TakeBlueprint;
+
+impl crate::CommandBlueprint for TakeBlueprint {
+    fn create(
+        &self,
+        args: Vec<Value>,
+        host: &dyn Host,
+        env: &mut Environment,
+    ) -> Result<Box<dyn Command>, ShellError> {
+        if args.is_empty() {
+            return Err(ShellError::string("take requires an integer"));
+        }
+
+        let amount = args[0].as_int()?;
+
+        Ok(Box::new(Take { amount }))
+    }
+}
+
+#[derive(new)]
+pub struct Take {
+    amount: i64,
+}
+
+impl crate::Command for Take {
+    fn run(&mut self, stream: VecDeque<Value>) -> Result<VecDeque<ReturnValue>, ShellError> {
+        let amount = if stream.len() > self.amount as usize {
+            self.amount as usize
+        } else {
+            stream.len()
+        };
+
+        let out: VecDeque<ReturnValue> = stream
+            .into_iter()
+            .take(amount)
+            .map(|v| ReturnValue::Value(v))
+            .collect();
+
+        Ok(out)
+    }
+}

src/commands/to_array.rs

@@ -30,3 +30,10 @@ impl crate::Command for ToArray {
         Ok(ReturnValue::single(Value::List(out)))
     }
 }
+
+crate fn to_array(stream: VecDeque<Value>) -> VecDeque<Value> {
+    let out = Value::List(stream.into_iter().collect());
+    let mut stream = VecDeque::new();
+    stream.push_back(out);
+    stream
+}

src/context.rs

@@ -0,0 +1,46 @@
+use crate::prelude::*;
+use std::collections::BTreeMap;
+use std::error::Error;
+
+pub type Commands = BTreeMap<String, Box<dyn crate::CommandBlueprint>>;
+
+pub struct Context {
+    commands: BTreeMap<String, Box<dyn crate::CommandBlueprint>>,
+    crate host: Box<dyn crate::Host>,
+    crate env: Environment,
+}
+
+impl Context {
+    crate fn basic() -> Result<Context, Box<Error>> {
+        Ok(Context {
+            commands: BTreeMap::new(),
+            host: Box::new(crate::env::host::BasicHost),
+            env: crate::Environment::basic()?,
+        })
+    }
+
+    pub fn add_commands(&mut self, commands: Vec<(&str, Box<dyn crate::CommandBlueprint>)>) {
+        for (name, command) in commands {
+            self.commands.insert(name.to_string(), command);
+        }
+    }
+
+    crate fn get_command(&mut self, name: &str) -> Option<&dyn crate::CommandBlueprint> {
+        self.commands.get(name).map(|c| &**c)
+    }
+
+    crate fn has_command(&mut self, name: &str) -> bool {
+        self.commands.contains_key(name)
+    }
+
+    crate fn create_command(
+        &mut self,
+        name: &str,
+        arg_list: Vec<Value>,
+    ) -> Result<Box<dyn Command>, ShellError> {
+        match self.commands.get(name) {
+            Some(command) => Ok(command.create(arg_list, &self.host, &mut self.env)?),
+            None => Err(ShellError::string(format!("Missing command {}", name))),
+        }
+    }
+}

src/format.rs

@@ -6,7 +6,7 @@ crate mod table;
 use crate::object::Value;
 use crate::prelude::*;
 
-crate use entries::EntriesView;
+crate use entries::{EntriesListView, EntriesView};
 crate use generic::GenericView;
 crate use list::ListView;
 crate use table::TableView;

src/format/entries.rs

@@ -1,5 +1,8 @@
 use crate::format::RenderView;
+use crate::object::base::ToEntriesView;
+use crate::prelude::*;
 use crate::Host;
+
 use derive_new::new;
 
 // An entries list is printed like this:
@@ -26,3 +29,38 @@ impl RenderView for EntriesView {
             .collect()
     }
 }
+
+pub struct EntriesListView {
+    values: VecDeque<Value>,
+}
+
+impl EntriesListView {
+    crate fn from_stream(values: VecDeque<Value>) -> EntriesListView {
+        EntriesListView { values }
+    }
+}
+
+impl RenderView for EntriesListView {
+    fn render_view(&self, host: &dyn Host) -> Vec<String> {
+        if self.values.len() == 0 {
+            return vec![];
+        }
+
+        let mut strings = vec![];
+
+        let last = self.values.len() - 1;
+
+        for (i, item) in self.values.iter().enumerate() {
+            let view = item.to_entries_view();
+            let out = view.render_view(host);
+
+            strings.extend(out);
+
+            if i != last {
+                strings.push("\n".to_string());
+            }
+        }
+
+        strings
+    }
+}

src/main.rs

@@ -3,6 +3,7 @@
 #![allow(unused)]
 
 mod commands;
+mod context;
 mod env;
 mod errors;
 mod format;
@@ -13,11 +14,12 @@ mod prelude;
 crate use crate::commands::args::{Args, Streams};
 use crate::commands::command::ReturnValue;
 crate use crate::commands::command::{Command, CommandAction, CommandBlueprint};
+use crate::context::Context;
 crate use crate::env::{Environment, Host};
 crate use crate::errors::ShellError;
-crate use crate::format::RenderView;
+crate use crate::format::{EntriesListView, RenderView};
 use crate::object::base::{ToEntriesView, ToGenericView};
-use crate::object::Value;
+use crate::object::{ShellObject, Value};
 
 use ansi_term::Color;
 use conch_parser::lexer::Lexer;
@@ -29,6 +31,7 @@ use std::collections::BTreeMap;
 use std::collections::VecDeque;
 use std::error::Error;
 use std::rc::Rc;
+use std::sync::{Arc, Mutex};
 use subprocess::Exec;
 use sysinfo::{self, SystemExt};
 
@@ -47,51 +50,30 @@ impl<T> MaybeOwned<'a, T> {
     }
 }
 
-type Commands = BTreeMap<String, Box<dyn crate::CommandBlueprint>>;
-
-struct Context {
-    commands: BTreeMap<String, Box<dyn crate::CommandBlueprint>>,
-    host: Box<dyn crate::Host>,
-    env: Environment,
-}
-
-impl Context {
-    fn basic() -> Result<Context, Box<Error>> {
-        Ok(Context {
-            commands: BTreeMap::new(),
-            host: Box::new(crate::env::host::BasicHost),
-            env: crate::Environment::basic()?,
-        })
-    }
-}
-
 fn main() -> Result<(), Box<Error>> {
     let mut rl = Editor::<()>::new();
     if rl.load_history("history.txt").is_err() {
         println!("No previous history.");
     }
 
-    let mut context = Context::basic()?;
+    let mut context = Arc::new(Mutex::new(Context::basic()?));
 
-    // let mut commands = BTreeMap::<String, Box<dyn crate::CommandBlueprint>>::new();
+    {
+        use crate::commands::*;
 
-    let mut system = Rc::new(RefCell::new(sysinfo::System::new()));
+        context.lock().unwrap().add_commands(vec![
-    let mut ps = crate::commands::ps::PsBlueprint::new(system);
+            ("ps", Box::new(ps::PsBlueprint)),
-    let mut ls = crate::commands::ls::LsBlueprint;
+            ("ls", Box::new(ls::LsBlueprint)),
-    let mut cd = crate::commands::cd::CdBlueprint;
+            ("cd", Box::new(cd::CdBlueprint)),
-    let mut to_array = crate::commands::to_array::ToArrayBlueprint;
+            ("take", Box::new(take::TakeBlueprint)),
-
+            ("to-array", Box::new(to_array::ToArrayBlueprint)),
-    context.commands.insert("ps".to_string(), Box::new(ps));
+        ]);
-    context.commands.insert("ls".to_string(), Box::new(ls));
+    }
-    context.commands.insert("cd".to_string(), Box::new(cd));
-    context
-        .commands
-        .insert("to-array".to_string(), Box::new(to_array));
 
     loop {
         let readline = rl.readline(&format!(
             "{}> ",
-            Color::Green.paint(context.env.cwd().display().to_string())
+            Color::Green.paint(context.lock().unwrap().env.cwd().display().to_string())
         ));
 
         match readline {
@@ -105,16 +87,23 @@ fn main() -> Result<(), Box<Error>> {
 
                 let mut input = VecDeque::new();
 
+                let last = parsed.len() - 1;
+
                 for item in parsed {
-                    // println!("Processing {:?}", item);
                     input = process_command(
                         crate::parser::print_items(&item),
                         item.clone(),
                         input,
-                        &mut context,
+                        context.clone(),
                     )?;
+                }
 
-                    // println!("OUTPUT: {:?}", input);
+                if input.len() > 0 {
+                    if equal_shapes(&input) {
+                        format(crate::commands::to_array(input), context.clone());
+                    } else {
+                        format(input, context.clone());
+                    }
                 }
             }
             Err(ReadlineError::Interrupted) => {
@@ -140,31 +129,30 @@ fn process_command(
     line: String,
     parsed: Vec<crate::parser::Item>,
     input: VecDeque<Value>,
-    context: &mut Context,
+    context: Arc<Mutex<Context>>,
 ) -> Result<VecDeque<Value>, ShellError> {
     let command = &parsed[0].name();
-    let arg_list = parsed[1..]
+    let arg_list = parsed[1..].iter().map(|i| i.as_value()).collect();
-        .iter()
-        .map(|i| Value::string(i.name().to_string()))
-        .collect();
 
     let streams = Streams::new();
 
-    // let args = Args::new(arg_list);
+    if command == &"format" {
+        format(input, context);
 
-    match *command {
+        Ok(VecDeque::new())
-        "format" => {
+    } else if command == &"format-list" {
-            for item in input {
+        let view = EntriesListView::from_stream(input);
-                let view = item.to_generic_view();
+        let mut ctx = context.lock().unwrap();
-                crate::format::print_rendered(&view.render_view(&context.host), &mut context.host);
-            }
 
-            Ok(VecDeque::new())
+        crate::format::print_rendered(&view.render_view(&ctx.host), &mut ctx.host);
-        }
 
-        command => match context.commands.get_mut(command) {
+        Ok(VecDeque::new())
-            Some(command) => {
+    } else {
-                let mut instance = command.create(arg_list, &context.host, &mut context.env)?;
+        let mut ctx = context.lock().unwrap();
+
+        match ctx.has_command(*command) {
+            true => {
+                let mut instance = ctx.create_command(command, arg_list)?;
 
                 let mut result = instance.run(input)?;
                 let mut next = VecDeque::new();
@@ -172,7 +160,7 @@ fn process_command(
                 for v in result {
                     match v {
                         ReturnValue::Action(action) => match action {
-                            crate::CommandAction::ChangeCwd(cwd) => context.env.cwd = cwd,
+                            crate::CommandAction::ChangeCwd(cwd) => ctx.env.cwd = cwd,
                         },
 
                         ReturnValue::Value(v) => next.push_back(v),
@@ -182,10 +170,43 @@ fn process_command(
                 Ok(next)
             }
 
-            other => {
+            false => {
-                Exec::shell(line).cwd(context.env.cwd()).join().unwrap();
+                Exec::shell(line).cwd(ctx.env.cwd()).join().unwrap();
                 Ok(VecDeque::new())
             }
-        },
+        }
     }
 }
+
+fn format(input: VecDeque<Value>, context: Arc<Mutex<Context>>) {
+    let mut ctx = context.lock().unwrap();
+
+    let last = input.len() - 1;
+    for (i, item) in input.iter().enumerate() {
+        let view = item.to_generic_view();
+        crate::format::print_rendered(&view.render_view(&ctx.host), &mut ctx.host);
+
+        if last != i {
+            println!("");
+        }
+    }
+}
+
+fn equal_shapes(input: &VecDeque<Value>) -> bool {
+    let mut items = input.iter();
+
+    let item = match items.next() {
+        Some(item) => item,
+        None => return false,
+    };
+
+    let desc = item.data_descriptors();
+
+    for item in items {
+        if desc != item.data_descriptors() {
+            return false;
+        }
+    }
+
+    true
+}

src/object/base.rs

@@ -42,6 +42,7 @@ impl ShellObject for Value {
             Value::List(l) => format!("[list List]"),
         }
     }
+
     fn data_descriptors(&self) -> Vec<DataDescriptor> {
         match self {
             Value::Primitive(p) => vec![],
@@ -80,6 +81,17 @@ impl Value {
         }
     }
 
+    crate fn as_int(&self) -> Result<i64, ShellError> {
+        match self {
+            Value::Primitive(Primitive::Int(i)) => Ok(*i),
+            // TODO: this should definitely be more general with better errors
+            other => Err(ShellError::string(format!(
+                "Expected integer, got {:?}",
+                other
+            ))),
+        }
+    }
+
     crate fn string(s: impl Into<String>) -> Value {
         Value::Primitive(Primitive::String(s.into()))
     }
@@ -115,7 +127,10 @@ pub trait ToEntriesView {
     fn to_entries_view(&self) -> EntriesView;
 }
 
-impl ToEntriesView for ShellObject {
+impl<T> ToEntriesView for T
+where
+    T: ShellObject,
+{
     fn to_entries_view(&self) -> EntriesView {
         let descs = self.data_descriptors();
         let mut entries = vec![];
@@ -136,6 +151,19 @@ impl ToEntriesView for ShellObject {
     }
 }
 
+impl ShellObject for Box<dyn ShellObject> {
+    fn to_shell_string(&self) -> String {
+        (**self).to_shell_string()
+    }
+    fn data_descriptors(&self) -> Vec<DataDescriptor> {
+        (**self).data_descriptors()
+    }
+
+    fn get_data(&'a self, desc: &DataDescriptor) -> crate::MaybeOwned<'a, Value> {
+        (**self).get_data(desc)
+    }
+}
+
 pub trait ToGenericView {
     fn to_generic_view(&self) -> GenericView;
 }

src/object/desc.rs

@@ -1,4 +1,4 @@
-use crate::object::types::{Any, Type};
+use crate::object::types::{AnyShell, Type};
 use derive_new::new;
 
 #[derive(new)]
@@ -8,12 +8,18 @@ pub struct DataDescriptor {
     crate ty: Box<dyn Type>,
 }
 
+impl PartialEq for DataDescriptor {
+    fn eq(&self, other: &DataDescriptor) -> bool {
+        self.name == other.name && self.readonly == other.readonly && self.ty.equal(&*other.ty)
+    }
+}
+
 impl DataDescriptor {
     crate fn any(name: impl Into<String>) -> DataDescriptor {
         DataDescriptor {
             name: name.into(),
             readonly: true,
-            ty: Box::new(Any),
+            ty: Box::new(AnyShell),
         }
     }
 }

src/object/dict.rs

@@ -26,7 +26,7 @@ impl crate::object::ShellObject for Dictionary {
         self.entries
             .iter()
             .map(|(name, value)| {
-                DataDescriptor::new(name.clone(), true, Box::new(crate::object::types::Any))
+                DataDescriptor::new(name.clone(), true, Box::new(crate::object::types::AnyShell))
             })
             .collect()
     }
@@ -59,7 +59,7 @@ impl crate::object::ShellObject for ScopedDictionary<'parent> {
         self.entries
             .iter()
             .map(|(name, value)| {
-                DataDescriptor::new(name.clone(), true, Box::new(crate::object::types::Any))
+                DataDescriptor::new(name.clone(), true, Box::new(crate::object::types::AnyShell))
             })
             .collect()
     }

src/object/types.rs

@@ -1,5 +1,19 @@
-pub trait Type {}
+use std::any::{Any, TypeId};
 
-pub struct Any;
+pub trait Type {
+    fn as_any(&self) -> &dyn Any;
+    fn equal(&self, other: &dyn Type) -> bool;
+}
 
-impl Type for Any {}
+#[derive(Eq, PartialEq)]
+pub struct AnyShell;
+
+impl Type for AnyShell {
+    fn as_any(&self) -> &dyn Any {
+        self as &dyn Any
+    }
+
+    fn equal(&self, other: &dyn Type) -> bool {
+        other.as_any().is::<AnyShell>()
+    }
+}

src/parser.rs

@@ -1,63 +1,4 @@
-use nom::branch::alt;
+crate mod completer;
-use nom::bytes::complete::{escaped, is_not, tag};
+crate mod parse;
-use nom::character::complete::one_of;
-use nom::multi::separated_list;
-use nom::sequence::{preceded, terminated};
-use nom::IResult;
-use nom::{complete, named, separated_list, ws};
 
-#[derive(Debug, Clone)]
+crate use self::parse::{print_items, shell_parser, Item};
-pub enum Item {
-    Quoted(String),
-    Bare(String),
-}
-
-crate fn print_items(items: &[Item]) -> String {
-    let mut out = String::new();
-
-    let formatted = items.iter().map(|item| match item {
-        Item::Bare(s) => format!("{}", s),
-        Item::Quoted(s) => format!("{:?}", s),
-    });
-
-    itertools::join(formatted, " ")
-}
-
-impl Item {
-    crate fn name(&self) -> &str {
-        match self {
-            Item::Quoted(s) => s,
-            Item::Bare(s) => s,
-        }
-    }
-}
-
-fn esc(s: &str) -> IResult<&str, &str> {
-    escaped(is_not("\\\""), '\\', one_of("\"n\\"))(s)
-}
-
-fn quoted(s: &str) -> IResult<&str, Item> {
-    terminated(preceded(tag("\""), esc), tag("\""))(s)
-        .map(|(a, b)| (a, Item::Quoted(b.to_string())))
-}
-
-fn unquoted(s: &str) -> IResult<&str, Item> {
-    is_not(" |")(s).map(|(a, b)| (a, Item::Bare(b.to_string())))
-}
-
-fn command_token(s: &str) -> IResult<&str, Item> {
-    alt((quoted, unquoted))(s)
-}
-
-fn command_args(s: &str) -> IResult<&str, Vec<Item>> {
-    separated_list(tag(" "), command_token)(s)
-}
-
-named!(
-  pub shell_parser(&str) -> Vec<Vec<Item>>,
-  complete!(
-    ws!(
-      separated_list!(tag("|"), command_args)
-    )
-  )
-);

src/parser/completer.rs

@@ -0,0 +1,32 @@
+use rustyline::{completion, Context};
+use std::collections::BTreeMap;
+
+crate struct Completer {
+    commands: BTreeMap<String, Box<dyn crate::CommandBlueprint>>,
+}
+
+impl completion::Completer for Completer {
+    type Candidate = completion::Pair;
+
+    fn complete(
+        &self,
+        line: &str,
+        pos: usize,
+        ctx: &Context<'_>,
+    ) -> rustyline::Result<(usize, Vec<completion::Pair>)> {
+        let pairs = self
+            .commands
+            .keys()
+            .map(|k| completion::Pair {
+                display: k.clone(),
+                replacement: k.clone(),
+            })
+            .collect();
+        Ok((0, pairs))
+    }
+
+    fn update(&self, line: &mut rustyline::line_buffer::LineBuffer, start: usize, elected: &str) {
+        let end = line.pos();
+        line.replace(start..end, elected)
+    }
+}

src/parser/parse.rs

@@ -0,0 +1,82 @@
+use crate::prelude::*;
+use nom::branch::alt;
+use nom::bytes::complete::{escaped, is_a, is_not, tag};
+use nom::character::complete::one_of;
+use nom::multi::separated_list;
+use nom::sequence::{preceded, terminated};
+use nom::IResult;
+use nom::{complete, named, separated_list, ws};
+use std::str::FromStr;
+
+#[derive(Debug, Clone)]
+pub enum Item {
+    Quoted(String),
+    Bare(String),
+    Int(i64),
+}
+
+impl Item {
+    crate fn as_value(&self) -> Value {
+        match self {
+            Item::Quoted(s) => Value::Primitive(Primitive::String(s.clone())),
+            Item::Bare(s) => Value::Primitive(Primitive::String(s.clone())),
+            Item::Int(i) => Value::Primitive(Primitive::Int(*i)),
+        }
+    }
+}
+
+crate fn print_items(items: &[Item]) -> String {
+    let mut out = String::new();
+
+    let formatted = items.iter().map(|item| match item {
+        Item::Bare(s) => format!("{}", s),
+        Item::Quoted(s) => format!("{:?}", s),
+        Item::Int(i) => format!("{:?}", i),
+    });
+
+    itertools::join(formatted, " ")
+}
+
+impl Item {
+    crate fn name(&self) -> &str {
+        match self {
+            Item::Quoted(s) => s,
+            Item::Bare(s) => s,
+            Item::Int(i) => unimplemented!(),
+        }
+    }
+}
+
+fn esc(s: &str) -> IResult<&str, &str> {
+    escaped(is_not("\\\""), '\\', one_of("\"n\\"))(s)
+}
+
+fn quoted(s: &str) -> IResult<&str, Item> {
+    terminated(preceded(tag("\""), esc), tag("\""))(s)
+        .map(|(a, b)| (a, Item::Quoted(b.to_string())))
+}
+
+fn unquoted(s: &str) -> IResult<&str, Item> {
+    is_not(" |")(s).map(|(a, b)| (a, Item::Bare(b.to_string())))
+}
+
+fn int(s: &str) -> IResult<&str, Item> {
+    is_a("1234567890")(s).map(|(a, b)| (a, Item::Int(FromStr::from_str(b).unwrap())))
+}
+
+fn command_token(s: &str) -> IResult<&str, Item> {
+    alt((int, quoted, unquoted))(s)
+}
+
+fn command_args(s: &str) -> IResult<&str, Vec<Item>> {
+    separated_list(tag(" "), command_token)(s)
+}
+
+named!(
+  pub shell_parser(&str) -> Vec<Vec<Item>>,
+  complete!(
+    ws!(
+      separated_list!(tag("|"), command_args)
+    )
+  )
+);

src/prelude.rs

@@ -3,4 +3,5 @@ crate use crate::commands::command::{Command, CommandAction, CommandBlueprint, R
 crate use crate::env::{Environment, Host};
 crate use crate::errors::ShellError;
 crate use crate::format::RenderView;
+crate use crate::object::{Primitive, Value};
 crate use std::collections::VecDeque;