Added harper

package-lock.json

@@ -14,6 +14,7 @@
         "@tauri-apps/plugin-fs": "^2",
         "@tauri-apps/plugin-opener": "^2",
         "@tauri-apps/plugin-sql": "^2",
+        "harper.js": "^1.2.0",
         "lucide-svelte": "^0.468.0",
         "marked": "^17.0.1"
       },
@@ -1785,6 +1786,12 @@
         "node": ">=10.13.0"
       }
     },
+    "node_modules/harper.js": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/harper.js/-/harper.js-1.2.0.tgz",
+      "integrity": "sha512-yer9QibW0pKdQdUaV1FO9KNGmuqrj943nx+gTx2/RfSns1wrAeumuSeOBnIWBDkBCXKLvgcG68poHF90W+T21Q==",
+      "license": "Apache-2.0"
+    },
     "node_modules/hasown": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/hasown/-/hasown-2.0.2.tgz",

package.json

@@ -18,6 +18,7 @@
     "@tauri-apps/plugin-fs": "^2",
     "@tauri-apps/plugin-opener": "^2",
     "@tauri-apps/plugin-sql": "^2",
+    "harper.js": "^1.2.0",
     "lucide-svelte": "^0.468.0",
     "marked": "^17.0.1"
   },

src/lib/components/story/ActionInput.svelte

@@ -8,6 +8,7 @@
   import { Send, Wand2, MessageSquare, Brain, Sparkles, Feather, RefreshCw, X, PenLine } from 'lucide-svelte';
   import type { Chapter } from '$lib/types';
   import Suggestions from './Suggestions.svelte';
+  import GrammarCheck from './GrammarCheck.svelte';
   import {
     emitUserInput,
     emitNarrativeResponse,
@@ -851,6 +852,9 @@
       onRefresh={refreshSuggestions}
     />
 
+    <!-- Grammar Check -->
+    <GrammarCheck text={inputValue} onApplySuggestion={(newText) => inputValue = newText} />
+
     <!-- Creative Writing Mode: Direction Input -->
     <div class="flex gap-2">
       <div class="relative flex-1">
@@ -922,6 +926,9 @@
       </button>
     </div>
 
+    <!-- Grammar Check -->
+    <GrammarCheck text={inputValue} onApplySuggestion={(newText) => inputValue = newText} />
+
     <!-- Adventure Mode: Input area -->
     <div class="flex gap-2">
       <div class="relative flex-1">

src/lib/components/story/GrammarCheck.svelte

@@ -0,0 +1,144 @@
+<script lang="ts">
+  import { grammarService, type GrammarIssue } from '$lib/services/grammar';
+  import { AlertCircle, Check, X, Plus } from 'lucide-svelte';
+  import { slide } from 'svelte/transition';
+
+  interface Props {
+    text: string;
+    onApplySuggestion: (newText: string) => void;
+  }
+
+  let { text, onApplySuggestion }: Props = $props();
+
+  let issues = $state<GrammarIssue[]>([]);
+  let checking = $state(false);
+  let expandedIssue = $state<number | null>(null);
+  let debounceTimeout: ReturnType<typeof setTimeout> | null = null;
+
+  // Debounced lint check
+  $effect(() => {
+    if (debounceTimeout) {
+      clearTimeout(debounceTimeout);
+    }
+
+    if (!text.trim()) {
+      issues = [];
+      return;
+    }
+
+    debounceTimeout = setTimeout(async () => {
+      checking = true;
+      try {
+        issues = await grammarService.lint(text);
+      } finally {
+        checking = false;
+      }
+    }, 500);
+
+    return () => {
+      if (debounceTimeout) {
+        clearTimeout(debounceTimeout);
+      }
+    };
+  });
+
+  function handleApplySuggestion(issue: GrammarIssue, suggestionIndex: number) {
+    const suggestion = issue.suggestions[suggestionIndex];
+    if (suggestion === undefined) return;
+
+    const before = text.slice(0, issue.start);
+    const after = text.slice(issue.end);
+    const newText = before + suggestion + after;
+    onApplySuggestion(newText);
+    expandedIssue = null;
+  }
+
+  async function handleAddToDictionary(issue: GrammarIssue) {
+    await grammarService.addWord(issue.problemText);
+    // Re-lint to remove the issue
+    issues = await grammarService.lint(text);
+    expandedIssue = null;
+  }
+
+  function handleDismiss(index: number) {
+    issues = issues.filter((_, i) => i !== index);
+    expandedIssue = null;
+  }
+
+  function toggleIssue(index: number) {
+    expandedIssue = expandedIssue === index ? null : index;
+  }
+</script>
+
+{#if issues.length > 0}
+  <div class="space-y-1.5" transition:slide={{ duration: 150 }}>
+    {#each issues as issue, index (issue.start + '-' + issue.end)}
+      <div
+        class="rounded-lg bg-yellow-900/20 border border-yellow-700/40 overflow-hidden"
+        transition:slide={{ duration: 150 }}
+      >
+        <!-- Issue header -->
+        <div
+          class="w-full flex items-start gap-2 p-2 text-left hover:bg-yellow-900/10 transition-colors cursor-pointer"
+          onclick={() => toggleIssue(index)}
+          onkeydown={(e) => e.key === 'Enter' && toggleIssue(index)}
+          role="button"
+          tabindex="0"
+        >
+          <AlertCircle class="h-4 w-4 text-yellow-500 shrink-0 mt-0.5" />
+          <div class="flex-1 min-w-0">
+            <div class="flex items-center gap-2 flex-wrap">
+              <span class="text-xs font-medium text-yellow-400 bg-yellow-900/40 px-1.5 py-0.5 rounded">
+                {issue.kind}
+              </span>
+              <span class="text-xs text-yellow-300/80 truncate">
+                "{issue.problemText}"
+              </span>
+            </div>
+            <p class="text-xs text-yellow-200/70 mt-0.5 line-clamp-1">
+              {issue.message}
+            </p>
+          </div>
+          <button
+            class="p-1 rounded hover:bg-yellow-800/30 text-yellow-500/60 hover:text-yellow-400 shrink-0"
+            onclick={(e) => { e.stopPropagation(); handleDismiss(index); }}
+            title="Dismiss"
+          >
+            <X class="h-3.5 w-3.5" />
+          </button>
+        </div>
+
+        <!-- Expanded content with suggestions -->
+        {#if expandedIssue === index}
+          <div class="px-2 pb-2 pt-1 border-t border-yellow-700/30" transition:slide={{ duration: 150 }}>
+            {#if issue.suggestions.length > 0}
+              <div class="flex flex-wrap gap-1.5">
+                {#each issue.suggestions.slice(0, 5) as suggestion, suggestionIndex}
+                  <button
+                    class="flex items-center gap-1 px-2 py-1 text-xs rounded bg-green-900/30 border border-green-700/40 text-green-300 hover:bg-green-900/50 transition-colors"
+                    onclick={() => handleApplySuggestion(issue, suggestionIndex)}
+                  >
+                    <Check class="h-3 w-3" />
+                    {suggestion || '(remove)'}
+                  </button>
+                {/each}
+                {#if issue.kind.toLowerCase().includes('spell')}
+                  <button
+                    class="flex items-center gap-1 px-2 py-1 text-xs rounded bg-surface-700 border border-surface-600 text-surface-300 hover:bg-surface-600 transition-colors"
+                    onclick={() => handleAddToDictionary(issue)}
+                    title="Add to dictionary"
+                  >
+                    <Plus class="h-3 w-3" />
+                    Add to dictionary
+                  </button>
+                {/if}
+              </div>
+            {:else}
+              <p class="text-xs text-yellow-400/60 italic">No suggestions available</p>
+            {/if}
+          </div>
+        {/if}
+      </div>
+    {/each}
+  </div>
+{/if}

src/lib/services/grammar.ts

@@ -0,0 +1,123 @@
+import { LocalLinter, binary, type Lint, type Suggestion, type LintConfig } from 'harper.js';
+
+const DEBUG = false;
+
+function log(...args: unknown[]) {
+  if (DEBUG) {
+    console.log('[Grammar]', ...args);
+  }
+}
+
+export interface GrammarIssue {
+  message: string;
+  problemText: string;
+  start: number;
+  end: number;
+  suggestions: string[];
+  kind: string;
+}
+
+class GrammarService {
+  private linter: LocalLinter | null = null;
+  private setupPromise: Promise<void> | null = null;
+  private enabled = true;
+
+  async setup(): Promise<void> {
+    if (this.linter) return;
+    if (this.setupPromise) return this.setupPromise;
+
+    this.setupPromise = (async () => {
+      try {
+        log('Initializing Harper linter...');
+        this.linter = new LocalLinter({ binary });
+        await this.linter.setup();
+
+        // Configure linter - disable some rules that might be too strict for creative writing
+        const config = await this.linter.getLintConfig();
+        // Disable rules that might interfere with creative writing
+        const updatedConfig: LintConfig = {
+          ...config,
+          // Keep most rules enabled, but disable some that might be annoying
+          'SentenceCapitalization': false, // Creative writing might have stylistic lowercase
+          'LongSentences': false, // Creative writing often has long sentences
+        };
+        await this.linter.setLintConfig(updatedConfig);
+
+        log('Harper linter initialized successfully');
+      } catch (error) {
+        console.error('[Grammar] Failed to initialize Harper:', error);
+        this.linter = null;
+      }
+    })();
+
+    return this.setupPromise;
+  }
+
+  async lint(text: string): Promise<GrammarIssue[]> {
+    if (!this.enabled || !text.trim()) return [];
+
+    await this.setup();
+    if (!this.linter) return [];
+
+    try {
+      const lints = await this.linter.lint(text, { language: 'plaintext' });
+      log('Linted text, found', lints.length, 'issues');
+
+      return lints.map((lint: Lint) => {
+        const span = lint.span();
+        const suggestions = lint.suggestions();
+
+        return {
+          message: lint.message(),
+          problemText: lint.get_problem_text(),
+          start: span.start,
+          end: span.end,
+          suggestions: suggestions.map((s: Suggestion) => s.get_replacement_text()),
+          kind: lint.lint_kind_pretty(),
+        };
+      });
+    } catch (error) {
+      log('Linting failed:', error);
+      return [];
+    }
+  }
+
+  async applySuggestion(text: string, issue: GrammarIssue, suggestionIndex: number): Promise<string> {
+    if (!this.linter) return text;
+
+    try {
+      // Reconstruct by replacing the span with the suggestion text
+      const suggestion = issue.suggestions[suggestionIndex];
+      if (suggestion === undefined) return text;
+
+      const before = text.slice(0, issue.start);
+      const after = text.slice(issue.end);
+      return before + suggestion + after;
+    } catch (error) {
+      log('Failed to apply suggestion:', error);
+      return text;
+    }
+  }
+
+  setEnabled(enabled: boolean) {
+    this.enabled = enabled;
+  }
+
+  isEnabled(): boolean {
+    return this.enabled;
+  }
+
+  async addWord(word: string): Promise<void> {
+    await this.setup();
+    if (!this.linter) return;
+
+    try {
+      await this.linter.importWords([word]);
+      log('Added word to dictionary:', word);
+    } catch (error) {
+      log('Failed to add word:', error);
+    }
+  }
+}
+
+export const grammarService = new GrammarService();

src/routes/+page.svelte

@@ -2,6 +2,7 @@
   import { onMount } from 'svelte';
   import { database } from '$lib/services/database';
   import { settings } from '$lib/stores/settings.svelte';
+  import { grammarService } from '$lib/services/grammar';
   import AppShell from '$lib/components/layout/AppShell.svelte';
 
   let initialized = $state(false);
@@ -15,6 +16,9 @@
       // Initialize settings from database
       await settings.init();
 
+      // Pre-load grammar checker WASM in background (don't await)
+      grammarService.setup().catch(console.error);
+
       initialized = true;
     } catch (e) {
       console.error('Initialization error:', e);

third-party-licenses/harper_LICENSE.md

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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+
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