Feature: cmdline parser

Cargo.toml

@@ -16,6 +16,7 @@ whoami = "1.2.0"                  # Utils for fetching user data
 rustyline = "9.0.0"               # Read user input
 tracing = "0.1.29"                #
 tracing-appender = "0.2.0"        # Logging
+peg = "0.7.0"                     # Parsing
 
 [dependencies.mlua]               # Lua interpreter
 version = "0.6.6"                 #

src/lib.rs

@@ -1,2 +1,3 @@
 pub mod core;
 pub mod log; // TODO: rename this module
+pub mod parser;

src/parser/mod.rs

@@ -0,0 +1,3 @@
+//! NeoSH command parser
+
+pub mod structure;

src/parser/structure.rs

@@ -0,0 +1,52 @@
+/// Command is what user sends. Consists of [CommandUnit]
+pub struct Command(Vec<CommandUnit>);
+
+// TODO: Operator as an enum
+/// Part of a [Command]. Can be either an [Instruction] or an Operator
+pub enum CommandUnit {
+    Instruction(Instruction),
+    Operator(String),
+}
+
+/// Instruction is a something that is called with [InstructionUnit]
+pub struct Instruction {
+    callable: String,
+    children: Vec<InstructionUnit>,
+}
+
+/// Either an argument or a [Flag]
+pub enum InstructionUnit {
+    Arg(String),
+    Flag(Flag),
+}
+
+/// Flag parameters
+///
+/// name - what comes after `--` or `-`
+/// value - what we pass to the flag
+/// length - see [FlagLength]
+/// storage - see [FlagStorage]
+pub struct Flag {
+    name: String,
+    value: Option<String>,
+    length: FlagLength,
+    storage: FlagStorage,
+}
+
+/// Flag length type
+///
+/// Short - `-`
+/// Long - `--`
+pub enum FlagLength {
+    Short,
+    Long,
+}
+
+/// How flag storages it's value
+// Inner - --a=b
+// Outer - --a b
+pub enum FlagStorage {
+    Inner,
+    Outer,
+}
+