Baseline project

src/repl/completer.rs

@@ -0,0 +1,159 @@
+use super::{ReplCommand, REPL_COMMANDS};
+
+use crate::{config::GlobalConfig, utils::fuzzy_filter};
+
+use reedline::{Completer, Span, Suggestion};
+use std::collections::HashMap;
+
+impl Completer for ReplCompleter {
+    fn complete(&mut self, line: &str, pos: usize) -> Vec<Suggestion> {
+        let mut suggestions = vec![];
+        let line = &line[0..pos];
+        let mut parts = split_line(line);
+        if parts.is_empty() {
+            return suggestions;
+        }
+        if parts[0].0 == r#":::"# {
+            parts.remove(0);
+        }
+
+        let parts_len = parts.len();
+        if parts_len == 0 {
+            return suggestions;
+        }
+        let (cmd, cmd_start) = parts[0];
+
+        if !cmd.starts_with('.') {
+            return suggestions;
+        }
+
+        let state = self.config.read().state();
+
+        let command_filter = parts
+            .iter()
+            .take(2)
+            .map(|(v, _)| *v)
+            .collect::<Vec<&str>>()
+            .join(" ");
+        let commands: Vec<_> = self
+            .commands
+            .iter()
+            .filter(|cmd| {
+                cmd.is_valid(state)
+                    && (command_filter.len() == 1 || cmd.name.starts_with(&command_filter[..2]))
+            })
+            .collect();
+        let commands = fuzzy_filter(commands, |v| v.name, &command_filter);
+
+        if parts_len > 1 {
+            let span = Span::new(parts[parts_len - 1].1, pos);
+            let args_line = &line[parts[1].1..];
+            let args: Vec<&str> = parts.iter().skip(1).map(|(v, _)| *v).collect();
+            suggestions.extend(
+                self.config
+                    .read()
+                    .repl_complete(cmd, &args, args_line)
+                    .iter()
+                    .map(|(value, description)| {
+                        let description = description.as_deref().unwrap_or_default();
+                        create_suggestion(value, description, span)
+                    }),
+            )
+        }
+
+        if suggestions.is_empty() {
+            let span = Span::new(cmd_start, pos);
+            suggestions.extend(commands.iter().map(|cmd| {
+                let name = cmd.name;
+                let description = cmd.description;
+                let has_group = self.groups.get(name).map(|v| *v > 1).unwrap_or_default();
+                let name = if has_group {
+                    name.to_string()
+                } else {
+                    format!("{name} ")
+                };
+                create_suggestion(&name, description, span)
+            }))
+        }
+        suggestions
+    }
+}
+
+pub struct ReplCompleter {
+    config: GlobalConfig,
+    commands: Vec<ReplCommand>,
+    groups: HashMap<&'static str, usize>,
+}
+
+impl ReplCompleter {
+    pub fn new(config: &GlobalConfig) -> Self {
+        let mut groups = HashMap::new();
+
+        let commands: Vec<ReplCommand> = REPL_COMMANDS.to_vec();
+
+        for cmd in REPL_COMMANDS.iter() {
+            let name = cmd.name;
+            *groups.entry(name).or_insert(0) += 1;
+        }
+
+        Self {
+            config: config.clone(),
+            commands,
+            groups,
+        }
+    }
+}
+
+fn create_suggestion(value: &str, description: &str, span: Span) -> Suggestion {
+    let description = if description.is_empty() {
+        None
+    } else {
+        Some(description.to_string())
+    };
+    Suggestion {
+        value: value.to_string(),
+        description,
+        style: None,
+        extra: None,
+        span,
+        append_whitespace: false,
+    }
+}
+
+fn split_line(line: &str) -> Vec<(&str, usize)> {
+    let mut parts = vec![];
+    let mut part_start = None;
+    for (i, ch) in line.char_indices() {
+        if ch == ' ' {
+            if let Some(s) = part_start {
+                parts.push((&line[s..i], s));
+                part_start = None;
+            }
+        } else if part_start.is_none() {
+            part_start = Some(i)
+        }
+    }
+    if let Some(s) = part_start {
+        parts.push((&line[s..], s));
+    } else {
+        parts.push(("", line.len()))
+    }
+    parts
+}
+
+#[test]
+fn test_split_line() {
+    assert_eq!(split_line(".role coder"), vec![(".role", 0), ("coder", 6)],);
+    assert_eq!(
+        split_line(" .role   coder"),
+        vec![(".role", 1), ("coder", 9)],
+    );
+    assert_eq!(
+        split_line(".set highlight "),
+        vec![(".set", 0), ("highlight", 5), ("", 15)],
+    );
+    assert_eq!(
+        split_line(".set highlight t"),
+        vec![(".set", 0), ("highlight", 5), ("t", 15)],
+    );
+}