View Commands

/**
 * Explicitly start autocompletion
 */
const startCompletion: Command;

/**
 * Close the currently active completion
 */
const closeCompletion: Command;

/**
 * Accept the current completion selection
 */
const acceptCompletion: Command;

import { startCompletion, closeCompletion, acceptCompletion } from "@codemirror/autocomplete";
import { EditorView } from "@codemirror/view";

// Manual completion trigger
const triggerCompletion = (view: EditorView) => {
  return startCompletion(view);
};

// Close completion programmatically
const hideCompletion = (view: EditorView) => {
  return closeCompletion(view);
};

// Accept current selection
const confirmCompletion = (view: EditorView) => {
  return acceptCompletion(view);
};

// Custom completion controls
const customCompletionKeys = [
  { key: "Ctrl-Space", run: startCompletion },
  { key: "Escape", run: closeCompletion },
  { key: "Tab", run: acceptCompletion }
];

/**
 * Move completion selection forward or backward
 */
function moveCompletionSelection(forward: boolean, by?: "option" | "page"): Command;

import { moveCompletionSelection } from "@codemirror/autocomplete";

// Navigation commands
const nextOption = moveCompletionSelection(true);
const prevOption = moveCompletionSelection(false);
const nextPage = moveCompletionSelection(true, "page");
const prevPage = moveCompletionSelection(false, "page");

// Custom navigation keymap
const navigationKeys = [
  { key: "ArrowDown", run: nextOption },
  { key: "ArrowUp", run: prevOption },
  { key: "PageDown", run: nextPage },
  { key: "PageUp", run: prevPage }
];

// Smart navigation with fallback
const smartNavigation = (view: EditorView, forward: boolean) => {
  // Try completion navigation first
  if (moveCompletionSelection(forward)(view)) {
    return true;
  }
  
  // Fall back to normal cursor movement
  return false;
};

import { 
  completionStatus, 
  currentCompletions, 
  selectedCompletion, 
  selectedCompletionIndex 
} from "@codemirror/autocomplete";

// Check completion state
const handleKeyPress = (view: EditorView, event: KeyboardEvent) => {
  const status = completionStatus(view.state);
  
  if (status === "active") {
    const selected = selectedCompletion(view.state);
    const index = selectedCompletionIndex(view.state);
    const all = currentCompletions(view.state);
    
    console.log(`Selected: ${selected?.label} (${index}/${all.length})`);
    
    // Custom handling for active completion
    if (event.key === "Tab" && selected) {
      return acceptCompletion(view);
    }
  } else if (status === "pending") {
    // Completion is loading
    console.log("Completion in progress...");
  } else {
    // No active completion
    if (event.key === " " && event.ctrlKey) {
      return startCompletion(view);
    }
  }
  
  return false;
};

import { 
  startCompletion, 
  currentCompletions, 
  selectedCompletionIndex,
  setSelectedCompletion,
  acceptCompletion 
} from "@codemirror/autocomplete";

// Custom completion widget
class CustomCompletionWidget {
  private view: EditorView;
  private element: HTMLElement;
  
  constructor(view: EditorView) {
    this.view = view;
    this.element = this.createWidget();
  }
  
  createWidget(): HTMLElement {
    const widget = document.createElement("div");
    widget.className = "custom-completion-widget";
    
    // Update widget when state changes
    this.view.dom.addEventListener("update", () => {
      this.updateWidget();
    });
    
    return widget;
  }
  
  updateWidget() {
    const completions = currentCompletions(this.view.state);
    const selectedIndex = selectedCompletionIndex(this.view.state);
    
    this.element.innerHTML = "";
    
    completions.forEach((completion, index) => {
      const item = document.createElement("div");
      item.className = "completion-item";
      item.textContent = completion.label;
      
      if (index === selectedIndex) {
        item.classList.add("selected");
      }
      
      item.addEventListener("click", () => {
        // Set selection and accept
        this.view.dispatch({
          effects: setSelectedCompletion(index)
        });
        acceptCompletion(this.view);
      });
      
      this.element.appendChild(item);
    });
  }
  
  show() {
    document.body.appendChild(this.element);
    startCompletion(this.view);
  }
  
  hide() {
    if (this.element.parentNode) {
      this.element.parentNode.removeChild(this.element);
    }
    closeCompletion(this.view);
  }
}

// Usage
const customWidget = new CustomCompletionWidget(view);
customWidget.show();

import { ViewPlugin, ViewUpdate } from "@codemirror/view";
import { completionStatus, startCompletion } from "@codemirror/autocomplete";

// Auto-completion on specific patterns
const autoCompletionPlugin = ViewPlugin.fromClass(class {
  constructor(private view: EditorView) {}
  
  update(update: ViewUpdate) {
    if (!update.docChanged) return;
    
    // Check for completion triggers
    const changes = update.changes;
    changes.iterChanges((fromA, toA, fromB, toB, inserted) => {
      const text = inserted.toString();
      
      // Trigger completion on dot notation
      if (text === "." && completionStatus(this.view.state) !== "active") {
        setTimeout(() => startCompletion(this.view), 0);
      }
      
      // Trigger completion after import statements
      if (text.includes("import") && text.includes("from")) {
        setTimeout(() => startCompletion(this.view), 100);
      }
    });
  }
});

// Completion with custom timing
const timedCompletionPlugin = ViewPlugin.fromClass(class {
  private timeout: number | null = null;
  
  constructor(private view: EditorView) {}
  
  update(update: ViewUpdate) {
    if (update.docChanged) {
      // Clear existing timeout
      if (this.timeout) {
        clearTimeout(this.timeout);
      }
      
      // Set new timeout for completion
      this.timeout = setTimeout(() => {
        const status = completionStatus(this.view.state);
        if (status !== "active" && status !== "pending") {
          startCompletion(this.view);
        }
        this.timeout = null;
      }, 500);
    }
  }
});

// Smart Enter key handling
const smartEnter = (view: EditorView) => {
  const status = completionStatus(view.state);
  
  if (status === "active") {
    const selected = selectedCompletion(view.state);
    if (selected) {
      // Accept completion and add newline
      acceptCompletion(view);
      setTimeout(() => {
        view.dispatch({
          changes: { from: view.state.selection.main.head, insert: "\n" },
          selection: { anchor: view.state.selection.main.head + 1 }
        });
      }, 0);
      return true;
    }
  }
  
  // Normal Enter behavior
  return false;
};

// Completion with auto-formatting
const formatAfterCompletion = (view: EditorView) => {
  const selected = selectedCompletion(view.state);
  
  if (selected && acceptCompletion(view)) {
    // Apply formatting after completion
    setTimeout(() => {
      // Custom formatting logic
      if (selected.type === "function") {
        // Format function calls
        formatFunctionCall(view);
      } else if (selected.type === "class") {
        // Format class instantiation
        formatClassInstantiation(view);
      }
    }, 10);
    
    return true;
  }
  
  return false;
};

// Multi-step completion workflow
const workflowCompletion = async (view: EditorView) => {
  // Step 1: Start completion
  if (!startCompletion(view)) return false;
  
  // Step 2: Wait for completion to be active
  await new Promise(resolve => {
    const checkActive = () => {
      if (completionStatus(view.state) === "active") {
        resolve(undefined);
      } else {
        setTimeout(checkActive, 10);
      }
    };
    checkActive();
  });
  
  // Step 3: Auto-select first function option
  const completions = currentCompletions(view.state);
  const functionIndex = completions.findIndex(c => c.type === "function");
  
  if (functionIndex >= 0) {
    view.dispatch({ effects: setSelectedCompletion(functionIndex) });
  }
  
  return true;
};