bash-like syntax

bash_info.md

@@ -0,0 +1,20 @@
+# invalid
+```bash
+$a="b"
+a = "b"
+a= "b"
+a ="b"
+```
+
+# valid
+```bash
+a="b"
+a=b
+```
+
+# examples
+```bash
+a="b c d"
+echo $a
+# output: b c d
+```

src/command.rs

@@ -1,10 +1,12 @@
 use std::{
     collections::HashMap,
-    fs::{self, ReadDir},
+    fs,
     path::Path,
     process,
 };
 
+use crate::SPECIAL_CHAR;
+
 type InnerEnv = HashMap<String, String>;
 pub struct Env {
     inner: InnerEnv,
@@ -30,7 +32,7 @@ impl Env {
     }
     pub fn apply_args_substitution(&self, args: Args) -> Vec<String> {
         args.iter().fold(Vec::new(), |mut vec, arg| {
-            if arg.starts_with('$') {
+            if arg.starts_with(SPECIAL_CHAR) {
                 // we take a slice to get rid of the '$'
                 if let Some(sub) = self.get(&arg[1..]) {
                     vec.push(sub.to_owned());
@@ -66,9 +68,6 @@ impl Command {
     }
 
     pub fn call(&self, words: Args, env: &mut Env) {
-        // apply env
-        let words: Args = &env.apply_args_substitution(words);
-
         let x = &self.cmd;
         x(words, env)
     }

src/main.rs

@@ -5,6 +5,8 @@ use command::{Command, Env, Args};
 
 mod command;
 
+pub static SPECIAL_CHAR: char = '$';
+
 fn main() {
     let stdin = std::io::stdin();
     let mut in_lock = stdin.lock();
@@ -14,7 +16,6 @@ fn main() {
     
     let mut env= Env::new();
     env.set("HOME", "/a/fake/dir");
-    env.set("PS1", "> ");
 
     let commands = &Command::all_commands(&env);
     println!("Loaded {} commands", commands.len());
@@ -31,7 +32,10 @@ fn main() {
             .read_line(&mut buf)
             .expect("Failed to read in to buffer.");
 
-        let mut args: Args = &buf.trim().split(' ').map(|f| f.to_owned()).collect::<Vec<String>>();
+        // TODO split at ' ' but don't split when it's surrounded by quotes '"'
+        let args= &buf.trim().split(' ').map(|f| f.to_owned()).collect::<Vec<String>>();
+        let args = env.apply_args_substitution(args);
+        let mut args: Args = &args;
 
         // let mut args: Args = &buf.trim().split(' ').collect::<Vec<&str>>();
         let mut options = commands;
@@ -44,7 +48,7 @@ fn main() {
                         Some(choice) => {
                             // No sub commands left to choose from, just pass the input
                             if choice.sub_commands.is_empty() {
-                                choice.call(args, &mut env);
+                                choice.call(&args, &mut env);
                                 break;
                             } 
 
@@ -55,13 +59,14 @@ fn main() {
                             if args.is_empty()
                             || Command::choose(&args[0], options).is_none() // yes, this means that we search for a choice twice if it misses, but the search takes all of 0ms, so it's fine.
                             {
-                                choice.call(args, &mut env);
+                                choice.call(&args, &mut env);
                                 break;
                             }
                         }
                         // When no good choice presents it's self
                         None => {
-                            println!("No option...");
+                            // perhaps they are trying to use builtins?
+                            parse_lang(&args, &mut env);
                             break;
                         },
                     }
@@ -71,3 +76,30 @@ fn main() {
         }
     }
 }
+
+fn parse_lang(tokens: Args, env: &mut Env) {
+    if let Some(first) =  tokens.first() {
+        if let Some((var, val)) = first.split_once('=') {
+            let var = var.replace(SPECIAL_CHAR, "");
+
+            // Make it so that strings don't get spliced up
+            let val = if val.starts_with('"') {
+                let mut buf = String::new();
+                buf += &val;
+                for i in &tokens[1..] {
+                    buf += " ";
+                    buf += i;
+                    if i.ends_with('"') {
+                        break;
+                    }
+                }
+                buf.replace('"', "")
+            } else {
+                val.to_owned()
+            };
+            env.set(&var, &val);
+        } else {
+            println!("first token is not a command but also doesn't include '='");
+        }
+    }
+}