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//! A command is the parsed representation of what the user types
//! in the input. It's independant of the state of the application
//! (verbs arent checked at this point)
use crossterm_input::KeyEvent;
use regex::Regex;
use termimad::{
Event,
InputField,
};
use crate::app_context::AppContext;
use crate::verb_invocation::VerbInvocation;
#[derive(Debug, Clone)]
pub struct Command {
pub raw: String, // what's visible in the input
parts: CommandParts, // the parsed parts of the visible input
pub action: Action, // what's required, based on the last key (which may be not visible, like esc)
}
/// An intermediate parsed representation of the raw string
#[derive(Debug, Clone)]
struct CommandParts {
pattern: Option<String>, // either a fuzzy pattern or the core of a regex
regex_flags: Option<String>, // may be Some("") if user asked for a regex but specified no flag
verb_invocation: Option<VerbInvocation>, // may be empty if user already typed the separator but no char after
}
#[derive(Debug, Clone)]
pub enum Action {
MoveSelection(i32), // up (neg) or down (positive) in the list
ScrollPage(i32), // in number of pages, not lines
OpenSelection, // open the selected line
AltOpenSelection, // alternate open the selected line
VerbEdit(VerbInvocation), // verb invocation, unfinished
VerbInvocate(VerbInvocation), // verb invocation, after the user hit enter (or used a trigger key)
FuzzyPatternEdit(String), // a pattern being edited
RegexEdit(String, String), // a regex being edited (core & flags)
Back, // back to last app state, or clear pattern
Next, // goes to the next matching entry
Previous, // goes to the previous matching entry
Help, // goes to help state
Click(u16, u16), // usually a mouse click
DoubleClick(u16, u16), // always come after a simple click at same position
Unparsed, // or unparsable
}
impl CommandParts {
fn new() -> CommandParts {
CommandParts {
pattern: None,
regex_flags: None,
verb_invocation: None,
}
}
fn from(raw: &str) -> CommandParts {
let mut cp = CommandParts::new();
lazy_static! {
static ref RE: Regex = Regex::new(
r"(?x)
^
(?P<slash_before>/)?
(?P<pattern>[^\s/:]+)?
(?:/(?P<regex_flags>\w*))?
(?:[\s:]+(?P<verb_invocation>.*))?
$
"
)
.unwrap();
}
if let Some(c) = RE.captures(raw) {
if let Some(pattern) = c.name("pattern") {
cp.pattern = Some(String::from(pattern.as_str()));
if let Some(rxf) = c.name("regex_flags") {
cp.regex_flags = Some(String::from(rxf.as_str()));
} else if c.name("slash_before").is_some() {
cp.regex_flags = Some("".into());
}
}
if let Some(verb) = c.name("verb_invocation") {
cp.verb_invocation = Some(VerbInvocation::from(verb.as_str()));
}
}
cp
}
}
impl Action {
fn from(cp: &CommandParts, finished: bool) -> Action {
if let Some(verb_invocation) = &cp.verb_invocation {
if finished {
Action::VerbInvocate(verb_invocation.clone())
} else {
Action::VerbEdit(verb_invocation.clone())
}
} else if finished {
Action::OpenSelection
} else if let Some(pattern) = &cp.pattern {
let pattern = String::from(pattern.as_str());
if let Some(regex_flags) = &cp.regex_flags {
Action::RegexEdit(pattern, String::from(regex_flags.as_str()))
} else {
Action::FuzzyPatternEdit(String::from(pattern.as_str()))
}
} else {
Action::FuzzyPatternEdit(String::from(""))
}
}
}
impl Command {
pub fn new() -> Command {
Command {
raw: String::new(),
parts: CommandParts::new(),
action: Action::Unparsed,
}
}
/// build a command from a string
/// Note that this isn't used (or usable) for interpretation
/// of the in-app user input. It's meant for interpretation
/// of a file or from a sequence of commands passed as argument
/// of the program.
/// A ':', even if at the end, is assumed to mean that the
/// command must be executed (it's equivalent to the user
/// typing `enter` in the app
/// This specific syntax isn't definitive
pub fn from(raw: String) -> Command {
let parts = CommandParts::from(&raw);
let action = Action::from(&parts, raw.contains(':'));
Command { raw, parts, action }
}
pub fn add_event(
&mut self,
event: &Event,
input_field: &mut InputField,
con: &AppContext,
) {
let mut handled_by_input_field = false;
match event {
Event::Click(x, y) => {
if !input_field.apply_event(&event) {
self.action = Action::Click(*x, *y);
}
}
Event::DoubleClick(x, y) => {
self.action = Action::DoubleClick(*x, *y);
}
Event::Key(key) => {
// we start by looking if the key is the trigger key of
// one of the verbs
for verb in &con.verb_store.verbs {
if let Some(verb_key) = verb.key {
if verb_key == *key {
// Cloning the invocation when we already know the verb
// isn't very clean or efficient (it means a second search will
// occur behind but it's simpler to manage now
self.action = Action::VerbInvocate(verb.invocation.clone());
return;
}
}
}
match *key {
KeyEvent::Char('\t') => {
self.action = Action::Next;
}
KeyEvent::BackTab => {
self.action = Action::Previous;
}
KeyEvent::Char('\n') => {
self.action = Action::from(&self.parts, true);
}
KeyEvent::Alt('\r') | KeyEvent::Alt('\n') => {
self.action = Action::AltOpenSelection;
}
KeyEvent::Up => {
self.action = Action::MoveSelection(-1);
}
KeyEvent::Down => {
self.action = Action::MoveSelection(1);
}
KeyEvent::PageUp | KeyEvent::Ctrl('u') => {
self.action = Action::ScrollPage(-1);
}
KeyEvent::PageDown | KeyEvent::Ctrl('d') => {
self.action = Action::ScrollPage(1);
}
KeyEvent::Char(c) if c =='?' && (self.raw.is_empty() || self.parts.verb_invocation.is_some()) => {
// a '?' opens the help when it's the first char or when it's part of the verb
// invocation
self.action = Action::Help;
}
KeyEvent::Esc => {
self.action = Action::Back;
}
KeyEvent::Char(_) |
KeyEvent::Home |
KeyEvent::End |
KeyEvent::Left |
KeyEvent::Right |
KeyEvent::Delete
=> {
handled_by_input_field = input_field.apply_event(&event);
}
KeyEvent::Backspace => {
handled_by_input_field = input_field.apply_event(&event);
if !handled_by_input_field {
self.action = Action::Back;
}
}
_ => {}
}
}
Event::Wheel(lines_count) => {
self.action = Action::MoveSelection(*lines_count);
}
}
if handled_by_input_field {
self.raw = input_field.get_content();
self.parts = CommandParts::from(&self.raw);
self.action = Action::from(&self.parts, false);
}
}
}
|
