feat: tag selection

src/renderer/components/Editor/Editor.tsx

@@ -8,6 +8,7 @@ import { PostLinks } from '../PostLinks';
 import { ErrorModal } from '../ErrorModal';
 import { SettingsView } from '../SettingsView';
 import { TagsView } from '../TagsView';
+import { TagInput } from '../TagInput';
 import { AutoSaveManager } from '../../utils';
 import './Editor.css';
 
@@ -149,7 +150,7 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
   
   const [title, setTitle] = useState(post.title);
   const [content, setContent] = useState(post.content);
-  const [tags, setTags] = useState(post.tags.join(', '));
+  const [tags, setTags] = useState<string[]>(post.tags);
   const [category, setCategory] = useState(post.categories[0] || 'article');
   const [availableCategories, setAvailableCategories] = useState<string[]>(['article', 'picture', 'aside', 'page']);
   const [isSaving, setIsSaving] = useState(false);
@@ -191,7 +192,7 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
   const pendingChangesRef = useRef<{
     title: string;
     content: string;
-    tags: string;
+    tags: string[];
     category: string;
     postId: string;
     isDirty: boolean;
@@ -225,7 +226,7 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
         window.electronAPI?.posts.update(pending.postId, {
           title: pending.title,
           content: pending.content,
-          tags: pending.tags.split(',').map(t => t.trim()).filter(t => t.length > 0),
+          tags: pending.tags,
           categories: pending.category ? [pending.category] : ['article'],
         }).then((updated) => {
           if (updated) {
@@ -243,7 +244,7 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
   useEffect(() => {
     setTitle(post.title);
     setContent(post.content);
-    setTags(post.tags.join(', '));
+    setTags(post.tags);
     setCategory(post.categories[0] || 'article');
     markClean(post.id);
   }, [post.id, post.title, post.content, post.tags, post.categories, markClean]);
@@ -251,19 +252,21 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
   // Track changes and notify auto-save manager
   useEffect(() => {
     const currentCategory = post.categories[0] || 'article';
+    const tagsChanged = JSON.stringify(tags.slice().sort()) !== JSON.stringify(post.tags.slice().sort());
     const hasChanges = 
       title !== post.title ||
       content !== post.content ||
-      tags !== post.tags.join(', ') ||
+      tagsChanged ||
       category !== currentCategory;
     
     if (hasChanges) {
       markDirty(post.id);
       // Notify auto-save manager with accumulated changes
+      // Convert tags array to comma-separated string for auto-save compatibility
       autoSaveManager.notifyChange(post.id, {
         title,
         content,
-        tags,
+        tags: tags.join(', '),
         category,
       });
     } else {
@@ -288,7 +291,7 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
       const updated = await window.electronAPI?.posts.update(post.id, {
         title,
         content,
-        tags: tags.split(',').map(t => t.trim()).filter(t => t.length > 0),
+        tags,
         categories: category ? [category] : ['article'],
       });
       
@@ -364,7 +367,7 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
         if (reverted) {
           setTitle(reverted.title);
           setContent(reverted.content);
-          setTags(reverted.tags.join(', '));
+          setTags(reverted.tags);
           setCategory(reverted.categories[0] || 'article');
           updatePost(post.id, reverted as Partial<PostData>);
           markClean(post.id);
@@ -512,12 +515,11 @@ const PostEditor: React.FC<PostEditorProps> = ({ post }) => {
           </div>
           <div className="editor-field-row">
             <div className="editor-field">
-              <label>Tags (comma-separated)</label>
+              <label>Tags</label>
-              <input
+              <TagInput
-                type="text"
                 value={tags}
-                onChange={(e) => setTags(e.target.value)}
+                onChange={setTags}
-                placeholder="tag1, tag2, tag3"
+                placeholder="Add tags..."
               />
             </div>
             <div className="editor-field">

src/renderer/components/TagInput/TagInput.css

@@ -0,0 +1,169 @@
+.tag-input-container {
+  position: relative;
+  width: 100%;
+}
+
+.tag-input-wrapper {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 6px;
+  padding: 6px 8px;
+  min-height: 38px;
+  border: 1px solid var(--border-color);
+  border-radius: 4px;
+  background: var(--background-primary);
+  cursor: text;
+}
+
+.tag-input-wrapper:focus-within {
+  border-color: var(--accent-color);
+  outline: none;
+}
+
+/* Tag chips */
+.tag-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 3px 8px;
+  font-size: 0.85rem;
+  background: var(--background-tertiary);
+  border: 1px solid var(--border-color);
+  border-radius: 4px;
+  color: var(--text-primary);
+  white-space: nowrap;
+}
+
+.tag-chip.has-color {
+  border-radius: 12px;
+  padding: 3px 10px;
+}
+
+.tag-chip-remove {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 16px;
+  height: 16px;
+  padding: 0;
+  margin-left: 2px;
+  border: none;
+  background: transparent;
+  color: inherit;
+  font-size: 1rem;
+  line-height: 1;
+  cursor: pointer;
+  opacity: 0.6;
+  border-radius: 50%;
+  transition: opacity 0.15s, background 0.15s;
+}
+
+.tag-chip-remove:hover {
+  opacity: 1;
+  background: rgba(0, 0, 0, 0.1);
+}
+
+.tag-chip.has-color .tag-chip-remove:hover {
+  background: rgba(0, 0, 0, 0.2);
+}
+
+/* Input field */
+.tag-input-field {
+  flex: 1;
+  min-width: 120px;
+  padding: 2px 4px;
+  border: none;
+  background: transparent;
+  color: var(--text-primary);
+  font-family: inherit;
+  font-size: 0.9rem;
+  outline: none;
+}
+
+.tag-input-field::placeholder {
+  color: var(--text-secondary);
+}
+
+.tag-input-field:disabled {
+  cursor: not-allowed;
+}
+
+/* Suggestions dropdown */
+.tag-suggestions {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  right: 0;
+  margin-top: 4px;
+  padding: 4px;
+  background: var(--background-primary);
+  border: 1px solid var(--border-color);
+  border-radius: 6px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  z-index: 100;
+  max-height: 240px;
+  overflow-y: auto;
+}
+
+.tag-suggestion {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  width: 100%;
+  padding: 8px 12px;
+  border: none;
+  background: transparent;
+  color: var(--text-primary);
+  font-family: inherit;
+  font-size: 0.9rem;
+  text-align: left;
+  cursor: pointer;
+  border-radius: 4px;
+  transition: background 0.1s;
+}
+
+.tag-suggestion:hover,
+.tag-suggestion.selected {
+  background: var(--background-hover);
+}
+
+.tag-suggestion-color {
+  width: 12px;
+  height: 12px;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.tag-suggestion-name {
+  flex: 1;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* Create new tag option */
+.tag-suggestion.create-new {
+  border-top: 1px solid var(--border-color);
+  margin-top: 4px;
+  padding-top: 12px;
+  color: var(--accent-color);
+}
+
+.tag-suggestion.create-new:first-child {
+  border-top: none;
+  margin-top: 0;
+  padding-top: 8px;
+}
+
+.tag-suggestion-icon {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 18px;
+  height: 18px;
+  border: 1px dashed currentColor;
+  border-radius: 4px;
+  font-size: 0.9rem;
+  font-weight: 600;
+}

src/renderer/components/TagInput/TagInput.tsx

@@ -0,0 +1,327 @@
+import React, { useState, useEffect, useRef, useCallback } from 'react';
+import { showToast } from '../Toast';
+import './TagInput.css';
+
+interface TagData {
+  id: string;
+  name: string;
+  color?: string;
+}
+
+interface TagInputProps {
+  /** Current tags assigned to the item */
+  value: string[];
+  /** Callback when tags change */
+  onChange: (tags: string[]) => void;
+  /** Placeholder text */
+  placeholder?: string;
+  /** Whether the input is disabled */
+  disabled?: boolean;
+}
+
+// Get contrasting text color for background
+const getContrastColor = (hex: string): string => {
+  const color = hex.replace('#', '');
+  let r: number, g: number, b: number;
+  if (color.length === 3) {
+    r = parseInt(color[0] + color[0], 16);
+    g = parseInt(color[1] + color[1], 16);
+    b = parseInt(color[2] + color[2], 16);
+  } else {
+    r = parseInt(color.substring(0, 2), 16);
+    g = parseInt(color.substring(2, 4), 16);
+    b = parseInt(color.substring(4, 6), 16);
+  }
+  const luminance = (0.299 * r + 0.587 * g + 0.114 * b) / 255;
+  return luminance > 0.5 ? '#000000' : '#ffffff';
+};
+
+export const TagInput: React.FC<TagInputProps> = ({
+  value,
+  onChange,
+  placeholder = 'Add tags...',
+  disabled = false,
+}) => {
+  const [inputValue, setInputValue] = useState('');
+  const [suggestions, setSuggestions] = useState<TagData[]>([]);
+  const [allTags, setAllTags] = useState<TagData[]>([]);
+  const [showSuggestions, setShowSuggestions] = useState(false);
+  const [selectedIndex, setSelectedIndex] = useState(-1);
+  const [isCreating, setIsCreating] = useState(false);
+  
+  const inputRef = useRef<HTMLInputElement>(null);
+  const containerRef = useRef<HTMLDivElement>(null);
+
+  // Load all available tags
+  const loadTags = useCallback(async () => {
+    try {
+      const tags = await window.electronAPI?.tags.getAll();
+      if (tags) {
+        setAllTags(tags as TagData[]);
+      }
+    } catch (error) {
+      console.error('Failed to load tags:', error);
+    }
+  }, []);
+
+  useEffect(() => {
+    loadTags();
+  }, [loadTags]);
+
+  // Listen for tag changes
+  useEffect(() => {
+    const unsubscribers: Array<() => void> = [];
+
+    unsubscribers.push(
+      window.electronAPI?.on('tag:created', () => loadTags()) || (() => {})
+    );
+    unsubscribers.push(
+      window.electronAPI?.on('tag:deleted', () => loadTags()) || (() => {})
+    );
+    unsubscribers.push(
+      window.electronAPI?.on('tag:renamed', () => loadTags()) || (() => {})
+    );
+    unsubscribers.push(
+      window.electronAPI?.on('tags:merged', () => loadTags()) || (() => {})
+    );
+
+    return () => {
+      unsubscribers.forEach(unsub => unsub());
+    };
+  }, [loadTags]);
+
+  // Filter suggestions based on input
+  useEffect(() => {
+    if (!inputValue.trim()) {
+      setSuggestions([]);
+      return;
+    }
+
+    const query = inputValue.toLowerCase().trim();
+    const filtered = allTags
+      .filter(tag => 
+        tag.name.toLowerCase().includes(query) &&
+        !value.includes(tag.name)
+      )
+      .slice(0, 8); // Limit to 8 suggestions
+
+    setSuggestions(filtered);
+    setSelectedIndex(-1);
+  }, [inputValue, allTags, value]);
+
+  // Close suggestions when clicking outside
+  useEffect(() => {
+    const handleClickOutside = (event: MouseEvent) => {
+      if (containerRef.current && !containerRef.current.contains(event.target as Node)) {
+        setShowSuggestions(false);
+      }
+    };
+
+    document.addEventListener('mousedown', handleClickOutside);
+    return () => document.removeEventListener('mousedown', handleClickOutside);
+  }, []);
+
+  // Add a tag
+  const addTag = useCallback((tagName: string) => {
+    const normalized = tagName.trim().toLowerCase();
+    if (!normalized) return;
+    
+    if (value.includes(normalized)) {
+      showToast.info('Tag already added');
+      return;
+    }
+
+    onChange([...value, normalized]);
+    setInputValue('');
+    setShowSuggestions(false);
+    inputRef.current?.focus();
+  }, [value, onChange]);
+
+  // Remove a tag
+  const removeTag = useCallback((tagName: string) => {
+    onChange(value.filter(t => t !== tagName));
+  }, [value, onChange]);
+
+  // Create a new tag and add it
+  const createAndAddTag = useCallback(async (tagName: string) => {
+    const normalized = tagName.trim().toLowerCase();
+    if (!normalized) return;
+
+    // Check if it already exists
+    const exists = allTags.some(t => t.name === normalized);
+    if (exists) {
+      addTag(normalized);
+      return;
+    }
+
+    setIsCreating(true);
+    try {
+      await window.electronAPI?.tags.create({ name: normalized });
+      addTag(normalized);
+      showToast.success(`Tag "${normalized}" created`);
+    } catch (error) {
+      const err = error as Error;
+      showToast.error(err.message);
+    } finally {
+      setIsCreating(false);
+    }
+  }, [allTags, addTag]);
+
+  // Handle keyboard navigation
+  const handleKeyDown = (e: React.KeyboardEvent<HTMLInputElement>) => {
+    if (e.key === 'ArrowDown') {
+      e.preventDefault();
+      const maxIndex = suggestions.length + (inputValue.trim() && !suggestions.some(s => s.name === inputValue.trim().toLowerCase()) ? 0 : -1);
+      setSelectedIndex(prev => Math.min(prev + 1, maxIndex));
+    } else if (e.key === 'ArrowUp') {
+      e.preventDefault();
+      setSelectedIndex(prev => Math.max(prev - 1, -1));
+    } else if (e.key === 'Enter') {
+      e.preventDefault();
+      if (selectedIndex >= 0 && selectedIndex < suggestions.length) {
+        addTag(suggestions[selectedIndex].name);
+      } else if (selectedIndex === suggestions.length && inputValue.trim()) {
+        // Create new tag option selected
+        createAndAddTag(inputValue.trim());
+      } else if (inputValue.trim()) {
+        // No selection, but there's input - check if exact match exists
+        const exactMatch = allTags.find(t => t.name === inputValue.trim().toLowerCase());
+        if (exactMatch) {
+          addTag(exactMatch.name);
+        } else {
+          createAndAddTag(inputValue.trim());
+        }
+      }
+    } else if (e.key === 'Escape') {
+      setShowSuggestions(false);
+      setInputValue('');
+    } else if (e.key === 'Backspace' && !inputValue && value.length > 0) {
+      // Remove last tag when backspace on empty input
+      removeTag(value[value.length - 1]);
+    } else if (e.key === ',') {
+      e.preventDefault();
+      if (inputValue.trim()) {
+        const exactMatch = allTags.find(t => t.name === inputValue.trim().toLowerCase());
+        if (exactMatch) {
+          addTag(exactMatch.name);
+        } else {
+          createAndAddTag(inputValue.trim());
+        }
+      }
+    }
+  };
+
+  // Get tag data for display
+  const getTagData = (tagName: string): TagData | undefined => {
+    return allTags.find(t => t.name === tagName);
+  };
+
+  // Check if input matches an existing tag exactly
+  const exactMatchExists = inputValue.trim() && 
+    allTags.some(t => t.name === inputValue.trim().toLowerCase());
+  
+  // Should show "Create new tag" option
+  const showCreateOption = inputValue.trim() && 
+    !exactMatchExists && 
+    !value.includes(inputValue.trim().toLowerCase());
+
+  return (
+    <div className="tag-input-container" ref={containerRef}>
+      <div className="tag-input-wrapper">
+        {/* Current tags */}
+        {value.map(tagName => {
+          const tagData = getTagData(tagName);
+          const hasColor = !!tagData?.color;
+          const style: React.CSSProperties = hasColor
+            ? {
+                backgroundColor: tagData!.color,
+                color: getContrastColor(tagData!.color!),
+                borderColor: tagData!.color,
+              }
+            : {};
+
+          return (
+            <span 
+              key={tagName} 
+              className={`tag-chip ${hasColor ? 'has-color' : ''}`}
+              style={style}
+            >
+              {tagName}
+              {!disabled && (
+                <button
+                  type="button"
+                  className="tag-chip-remove"
+                  onClick={() => removeTag(tagName)}
+                  tabIndex={-1}
+                  aria-label={`Remove ${tagName}`}
+                >
+                  ×
+                </button>
+              )}
+            </span>
+          );
+        })}
+
+        {/* Input field */}
+        <input
+          ref={inputRef}
+          type="text"
+          className="tag-input-field"
+          value={inputValue}
+          onChange={(e) => {
+            setInputValue(e.target.value);
+            setShowSuggestions(true);
+          }}
+          onFocus={() => setShowSuggestions(true)}
+          onKeyDown={handleKeyDown}
+          placeholder={value.length === 0 ? placeholder : ''}
+          disabled={disabled || isCreating}
+        />
+      </div>
+
+      {/* Suggestions dropdown */}
+      {showSuggestions && (suggestions.length > 0 || showCreateOption) && (
+        <div className="tag-suggestions">
+          {suggestions.map((tag, index) => {
+            const hasColor = !!tag.color;
+            const style: React.CSSProperties = hasColor
+              ? {
+                  '--tag-color': tag.color,
+                  '--tag-text-color': getContrastColor(tag.color!),
+                } as React.CSSProperties
+              : {};
+
+            return (
+              <button
+                key={tag.id}
+                type="button"
+                className={`tag-suggestion ${selectedIndex === index ? 'selected' : ''}`}
+                style={style}
+                onClick={() => addTag(tag.name)}
+              >
+                {hasColor && (
+                  <span 
+                    className="tag-suggestion-color" 
+                    style={{ backgroundColor: tag.color }}
+                  />
+                )}
+                <span className="tag-suggestion-name">{tag.name}</span>
+              </button>
+            );
+          })}
+          
+          {showCreateOption && (
+            <button
+              type="button"
+              className={`tag-suggestion create-new ${selectedIndex === suggestions.length ? 'selected' : ''}`}
+              onClick={() => createAndAddTag(inputValue.trim())}
+            >
+              <span className="tag-suggestion-icon">+</span>
+              <span>Create "{inputValue.trim()}"</span>
+            </button>
+          )}
+        </div>
+      )}
+    </div>
+  );
+};

src/renderer/components/TagInput/index.ts

@@ -0,0 +1 @@
+export { TagInput } from './TagInput';

src/renderer/components/index.ts

@@ -13,5 +13,6 @@ export { ResizablePanel } from './ResizablePanel';
 export { CredentialsPanel } from './CredentialsPanel';
 export { SettingsView } from './SettingsView';
 export { TagsView, scrollToTagsSection, type TagsCategory } from './TagsView';
+export { TagInput } from './TagInput';
 export { PostLinks } from './PostLinks';
 export { ErrorModal, type ErrorDetails } from './ErrorModal';