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|
//! Full Example - Todo List
//!
//! This example introduces how to use Mingling's features to build a complete CLI program
//!
//! > HAHA:
//! >
//! > This is truly a cliché example, as common as `Hello World`!
use mingling::{
LazyInit, LazyRes,
macros::route,
prelude::*,
res::ResExitCode,
setup::{ExitCodeSetup, HelpFlagSetup, StructuralRendererSetup},
};
use std::io::Write;
mod help;
pub use help::*;
mod todolist;
pub use todolist::*;
#[derive(Default, Clone)]
pub struct ResProgramFlags {
pub all: bool,
}
// Define dispatchers
dispatcher!("add");
dispatcher!("list");
dispatcher!("complete");
dispatcher!("clean");
// Define states
pack!(StateAddTodo = String);
pack!(StateCompleteTodo = i32);
pack!(StateListTodo = bool);
// Define errors
pack!(ErrorNoTaskDescriptionProvided = ());
pack!(ErrorNoIndexProvided = ());
pack!(ErrorIndexOutOfBounds = ());
fn main() {
let mut program = ThisProgram::new();
// Setups
program.with_setup(ExitCodeSetup::default());
program.with_setup(StructuralRendererSetup);
program.with_setup(HelpFlagSetup::new(["--help", "-h"]));
// Flags
let all = program.pick_global_flag(["-A", "--all"]);
// Resources
program.with_resource(
// Load on use
ResTodoList::lazy_init(read_todo_list)
// Write on drop
.with_on_drop(write_todo_list),
);
program.with_resource(ResProgramFlags { all });
// Dispatchers
program.with_dispatcher(CMDAdd);
program.with_dispatcher(CMDComplete);
program.with_dispatcher(CMDList);
program.with_dispatcher(CMDClean);
program.exec_and_exit();
}
// Command `add`
#[chain]
fn handle_add(args: EntryAdd) -> Next {
let task: String = route! {
args
.pick_or_route((), ErrorNoTaskDescriptionProvided::new(()))
.unpack()
};
StateAddTodo::new(task).to_chain()
}
#[chain]
fn handle_state_add_todo(
state: StateAddTodo,
// Inject ResTodoList resource
todolist: &mut LazyRes<ResTodoList>,
) -> Next {
let todolist = todolist.get_mut();
// Unpack state and read description
let description = state.inner;
todolist.items.push(Todo {
item: description,
completed: false,
});
// Clone todolist to render
let todolist = todolist.clone();
todolist.to_render()
}
// Command `list`
#[chain]
fn handle_list(_args: EntryList, todolist: &mut LazyRes<ResTodoList>) -> Next {
let todolist = todolist.get_mut().clone();
todolist.to_render()
}
// Command `complete`
#[chain]
fn handle_complete(args: EntryComplete) -> Next {
let index: i32 = route! {
args.pick_or_route((), ErrorNoIndexProvided::new(())).unpack()
};
StateCompleteTodo::new(index).to_chain()
}
#[chain]
fn handle_state_complete_todo(
state: StateCompleteTodo,
todolist: &mut LazyRes<ResTodoList>,
) -> Next {
let todolist = todolist.get_mut();
let index = state.inner as usize;
if index < todolist.items.len() {
todolist.items[index].completed = true;
todolist.clone().to_render()
} else {
ErrorIndexOutOfBounds::new(()).to_render()
}
}
// Command `clean`
#[chain]
fn handle_clean(
_args: EntryClean,
todolist: &mut LazyRes<ResTodoList>,
program_flags: &ResProgramFlags,
) -> Next {
let todolist = todolist.get_mut();
if program_flags.all {
todolist.items.clear();
} else {
todolist.items.retain(|item| !item.completed);
}
if todolist.items.is_empty() {
empty_result!()
} else {
todolist.clone().to_render()
}
}
/// Renders error when no task description is provided.
#[renderer]
pub fn render_error_no_task_description_provided(
_err: ErrorNoTaskDescriptionProvided,
// ExitCode
ec: &mut ResExitCode,
) -> RenderResult {
let mut render_result = RenderResult::new();
writeln!(render_result, "No task description provided!").ok();
writeln!(render_result).ok();
writeln!(render_result, "Use `todolist add <desc>` to add a task").ok();
ec.exit_code = 1;
render_result
}
/// Renders error when no index is provided.
#[renderer]
pub fn render_error_no_index_provided(
_err: ErrorNoIndexProvided,
// ExitCode
ec: &mut ResExitCode,
) -> RenderResult {
let mut render_result = RenderResult::new();
writeln!(render_result, "No index provided!").ok();
writeln!(render_result).ok();
writeln!(render_result, "Use `todolist list` to query indexes").ok();
ec.exit_code = 2;
render_result
}
/// Renders error when index is out of bounds.
#[renderer]
pub fn render_error_index_out_of_bounds(
_err: ErrorIndexOutOfBounds,
// ExitCode
ec: &mut ResExitCode,
) -> RenderResult {
let mut render_result = RenderResult::new();
writeln!(render_result, "Index out of bounds!").ok();
ec.exit_code = 3;
render_result
}
gen_program!();
|
