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import type { App } from "obsidian";
import vaultContextTemplate from "./context/vault-context-template.json";
/**
* Collected vault context summary injected into the AI system prompt.
*/
export interface VaultContext {
vaultName: string;
totalNotes: number;
totalFolders: number;
folderTree: string;
tagTaxonomy: string;
recentFiles: string;
}
/**
* Build a folder tree string from the vault.
* Produces an indented tree like:
* /
* ├── folder-a/
* │ ├── subfolder/
* ├── folder-b/
*/
function buildFolderTree(app: App): string {
const folders = app.vault.getAllFolders(true);
// Build a map of parent → children folder names
const tree = new Map<string, string[]>();
for (const folder of folders) {
if (folder.isRoot()) continue;
const parentPath = folder.parent?.path ?? "/";
const key = parentPath === "/" || parentPath === "" ? "/" : parentPath;
if (!tree.has(key)) {
tree.set(key, []);
}
const siblings = tree.get(key);
if (siblings !== undefined) {
siblings.push(folder.path);
}
}
const lines: string[] = [];
function walk(path: string, prefix: string): void {
const children = tree.get(path) ?? [];
children.sort();
for (let i = 0; i < children.length; i++) {
const child: string | undefined = children[i];
if (child === undefined) continue;
const isLast = i === children.length - 1;
const connector = isLast ? "└── " : "├── ";
const childPrefix = isLast ? " " : "│ ";
// Show just the folder name, not the full path
const name = child.split("/").pop() ?? child;
lines.push(`${prefix}${connector}${name}/`);
walk(child, prefix + childPrefix);
}
}
lines.push("/");
walk("/", "");
return lines.join("\n");
}
/**
* Collect all tags in the vault with their usage counts.
* Returns a formatted string like: #tag1 (12), #tag2 (8), ...
*/
function buildTagTaxonomy(app: App): string {
const tagCounts = new Map<string, number>();
const files = app.vault.getMarkdownFiles();
for (const file of files) {
const cache = app.metadataCache.getFileCache(file);
if (cache === null) continue;
// Inline tags
if (cache.tags !== undefined) {
for (const tagEntry of cache.tags) {
const tag = tagEntry.tag.toLowerCase();
tagCounts.set(tag, (tagCounts.get(tag) ?? 0) + 1);
}
}
// Frontmatter tags
if (cache.frontmatter?.tags !== undefined) {
const fmTags = cache.frontmatter.tags;
if (Array.isArray(fmTags)) {
for (const raw of fmTags) {
const tag = typeof raw === "string"
? (raw.startsWith("#") ? raw.toLowerCase() : `#${raw.toLowerCase()}`)
: "";
if (tag !== "") {
tagCounts.set(tag, (tagCounts.get(tag) ?? 0) + 1);
}
}
}
}
}
if (tagCounts.size === 0) {
return "No tags in vault.";
}
// Sort by count descending
const sorted = [...tagCounts.entries()].sort((a, b) => b[1] - a[1]);
// Cap at 100 tags to avoid overwhelming context
const maxTags = 100;
const limited = sorted.slice(0, maxTags);
const lines = limited.map(([tag, count]) => `${tag} (${count})`);
const suffix = sorted.length > maxTags
? `\n...and ${sorted.length - maxTags} more tags.`
: "";
return lines.join(", ") + suffix;
}
/**
* Get the most recently modified files.
*/
function buildRecentFiles(app: App, maxFiles: number): string {
const files = app.vault.getMarkdownFiles();
// Sort by modification time descending
const sorted = [...files].sort((a, b) => b.stat.mtime - a.stat.mtime);
const limited = sorted.slice(0, maxFiles);
if (limited.length === 0) {
return "No notes in vault.";
}
return limited.map((f) => f.path).join("\n");
}
/**
* Collect the full vault context summary.
* This is cheap — all data comes from the metadata cache and vault indexes.
*/
export function collectVaultContext(app: App, maxRecentFiles: number): VaultContext {
const markdownFiles = app.vault.getMarkdownFiles();
const allFolders = app.vault.getAllFolders(false);
return {
vaultName: app.vault.getName(),
totalNotes: markdownFiles.length,
totalFolders: allFolders.length,
folderTree: buildFolderTree(app),
tagTaxonomy: buildTagTaxonomy(app),
recentFiles: buildRecentFiles(app, maxRecentFiles),
};
}
/**
* Format the vault context into a system prompt block using the JSON template.
*/
export function formatVaultContext(ctx: VaultContext): string {
const t = vaultContextTemplate;
const lines: string[] = [];
lines.push(t.prefix);
lines.push("");
lines.push(t.fields.vaultName.replace("{vaultName}", ctx.vaultName));
lines.push(t.fields.totalNotes.replace("{totalNotes}", String(ctx.totalNotes)));
lines.push(t.fields.totalFolders.replace("{totalFolders}", String(ctx.totalFolders)));
lines.push("");
lines.push(t.sections.folderTree.replace("{folderTree}", ctx.folderTree));
lines.push("");
lines.push(t.sections.tagTaxonomy.replace("{tagTaxonomy}", ctx.tagTaxonomy));
lines.push("");
lines.push(t.sections.recentFiles.replace("{recentFiles}", ctx.recentFiles));
return lines.join("\n");
}
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