1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
//! 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 regex::Regex;
use termion::event::Key;
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
Verb(VerbInvocation), // verb invocation, after the user hit enter
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
Refresh, // refresh
Help, // goes to help state
Quit, // quit broot
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::Verb(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_key(&mut self, key: Key) {
match key {
Key::Char('\t') => {
self.action = Action::Next;
}
Key::Char('\n') => {
self.action = Action::from(&self.parts, true);
}
Key::Alt('\r') | Key::Alt('\n') => {
self.action = Action::AltOpenSelection;
}
Key::Ctrl('q') => {
self.action = Action::Quit;
}
Key::Up => {
self.action = Action::MoveSelection(-1);
}
Key::Down => {
self.action = Action::MoveSelection(1);
}
Key::F(5) => {
self.action = Action::Refresh;
}
Key::PageUp | Key::Ctrl('u') => {
self.action = Action::ScrollPage(-1);
}
Key::PageDown | Key::Ctrl('d') => {
self.action = Action::ScrollPage(1);
}
Key::Char(c) => {
if c == '?' && self.raw.is_empty() {
// as first character, a '?' is a request for help
self.action = Action::Help;
} else {
self.raw.push(c);
self.parts = CommandParts::from(&self.raw);
self.action = Action::from(&self.parts, false);
}
}
Key::Esc => {
self.action = Action::Back;
}
Key::Backspace => {
if self.raw == "" {
self.action = Action::Back;
} else {
self.raw.pop();
self.parts = CommandParts::from(&self.raw);
self.action = Action::from(&self.parts, false);
}
}
_ => {}
}
}
}