140 lines
4.7 KiB
Rust
140 lines
4.7 KiB
Rust
/* relish: versatile lisp shell
|
|
* Copyright (C) 2021 Aidan Hahn
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
use crate::eval::eval;
|
|
use crate::lex::lex;
|
|
use crate::segment::{Ctr, Seg};
|
|
use crate::sym::{Args, SymTable, Symbol, ValueType};
|
|
use std::path::Path;
|
|
use std::fs;
|
|
use std::iter::FromIterator;
|
|
use std::env::{vars, var, current_dir};
|
|
use std::rc::Rc;
|
|
|
|
fn prompt_default_callback(_: &Seg, _: &mut SymTable) -> Result<Ctr, String> {
|
|
Ok(Ctr::Symbol("λ".to_string()))
|
|
}
|
|
|
|
fn get_paths() -> Vec<String> {
|
|
Vec::from_iter(var("PATH")
|
|
.unwrap_or("".to_string().into())
|
|
.split(':')
|
|
.map(String::from))
|
|
}
|
|
|
|
pub fn load_defaults(syms: &mut SymTable) {
|
|
syms.insert(
|
|
"CFG_RELISH_POSIX".to_string(),
|
|
Symbol {
|
|
name: String::from("CFG_RELISH_POSIX"),
|
|
args: Args::None,
|
|
conditional_branches: false,
|
|
docs: "variable holding whether or not POSIX job control functions are to be loaded.
|
|
checked at shell startup by configuration daemon. not used afterwards.
|
|
|
|
default value: false".to_string(),
|
|
value: ValueType::VarForm(Box::new(Ctr::Bool(false))),
|
|
..Default::default()
|
|
},
|
|
);
|
|
|
|
syms.insert(
|
|
"CFG_RELISH_ENV".to_string(),
|
|
Symbol {
|
|
name: String::from("CFG_RELISH_ENV"),
|
|
args: Args::None,
|
|
conditional_branches: false,
|
|
docs: "variable holding whether or not vars and other symbols should be linked to process environment variables.
|
|
If set/defined all calls to def will result in additions or subtractions from user environment variables.
|
|
checked at shell startup by configuration daemon. not used afterwards.
|
|
|
|
default value: 1 (set)
|
|
".to_string(),
|
|
value: ValueType::VarForm(Box::new(Ctr::Bool(true))),
|
|
..Default::default()
|
|
},
|
|
);
|
|
|
|
syms.insert(
|
|
"CFG_RELISH_PROMPT".to_string(),
|
|
Symbol {
|
|
name: String::from("default relish prompt"),
|
|
args: Args::None,
|
|
conditional_branches: false,
|
|
docs: "function called to output prompt. this function is called with no arguments.
|
|
default value (<lambda>)"
|
|
.to_string(),
|
|
value: ValueType::Internal(Rc::new(prompt_default_callback)),
|
|
..Default::default()
|
|
},
|
|
);
|
|
}
|
|
|
|
pub fn load_environment(syms: &mut SymTable) {
|
|
for (key, value) in vars() {
|
|
syms.insert(
|
|
key.clone(),
|
|
Symbol{
|
|
name: key,
|
|
args: Args::None,
|
|
conditional_branches: false,
|
|
docs: String::from("from env vars at time of load"),
|
|
value: ValueType::VarForm(Box::new(Ctr::String(value))),
|
|
..Default::default()
|
|
}
|
|
);
|
|
}
|
|
}
|
|
|
|
pub fn run(filename: String, syms: &mut SymTable) -> Result<(), String> {
|
|
let script_read_res = fs::read_to_string(filename);
|
|
if script_read_res.is_err() {
|
|
Err(format!("Couldnt read script: {}", script_read_res.err().unwrap()))
|
|
} else {
|
|
let script_read = script_read_res.unwrap() + ")";
|
|
let script = "(".to_string() + &script_read;
|
|
eval(&*lex(&script)?, syms)?;
|
|
Ok(())
|
|
}
|
|
}
|
|
|
|
pub const RUN_DOCSTRING: &str = "Takes one string argument.
|
|
Attempts to find argument in PATH and attempts to call argument";
|
|
|
|
pub fn run_callback(ast: &Seg, syms: &mut SymTable) -> Result<Ctr, String> {
|
|
let mut prefixes = get_paths();
|
|
if let Ok(s) = current_dir() {
|
|
prefixes.push(String::from(s.to_str().unwrap()));
|
|
}
|
|
if let Ctr::String(ref filename) = *ast.car {
|
|
for prefix in prefixes {
|
|
let candidate = Path::new(&prefix.clone()).join(filename);
|
|
if candidate.exists() {
|
|
if filename.ends_with(".rls") {
|
|
return run(String::from(candidate.to_str().unwrap()), syms)
|
|
.and(Ok(Ctr::None))
|
|
} else {
|
|
return Err("binary called, unimplemented!".to_string())
|
|
}
|
|
}
|
|
}
|
|
|
|
Err(format!("file {} not found", filename))
|
|
} else {
|
|
Err("impossible: not a string".to_string())
|
|
}
|
|
}
|