6 files changed, 36 insertions, 180 deletions
diff --git a/deno/base/config.ts b/deno/base/config.ts
index 98722f6..96cc869 100644
--- a/deno/base/config.ts
+++ b/deno/base/config.ts
@@ -1,4 +1,4 @@
-import { camelCaseToKebabCase } from "./text.ts";
+import { StringUtils } from "./lib.ts";
 
 export interface ConfigDefinitionItem {
   readonly description: string;
@@ -29,7 +29,9 @@ export class ConfigProvider<K extends string> {
       for (const [key, def] of Object.entries(definition as ConfigDefinition)) {
         map[key] = {
           ...def,
-          env: `${this.#prefix}-${camelCaseToKebabCase(key as string)}`
+          env: `${this.#prefix}-${
+            StringUtils.camelCaseToKebabCase(key as string)
+          }`
             .replaceAll("-", "_")
             .toUpperCase(),
         };
@@ -91,4 +93,3 @@ export class ConfigProvider<K extends string> {
       .join("\n");
   }
 }
-
diff --git a/deno/base/date.ts b/deno/base/date.ts
deleted file mode 100644
index e65691e..0000000
--- a/deno/base/date.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-export function toFileNameString(date: Date, dateOnly?: boolean): string {
-  const str = date.toISOString();
-  return dateOnly === true
-    ? str.slice(0, str.indexOf("T"))
-    : str.replaceAll(/:|\./g, "-");
-}
diff --git a/deno/base/deno.json b/deno/base/deno.json
index 2c2d550..582f0f6 100644
--- a/deno/base/deno.json
+++ b/deno/base/deno.json
@@ -2,10 +2,8 @@
   "name": "@crupest/base",
   "version": "0.1.0",
   "exports": {
+    ".": "./lib.ts",
     "./config": "./config.ts",
-    "./cron": "./cron.ts",
-    "./date": "./date.ts",
-    "./text": "./text.ts",
-    "./log": "./log.ts"
+    "./cron": "./cron.ts"
   }
 }
diff --git a/deno/base/lib.ts b/deno/base/lib.ts
new file mode 100644
index 0000000..af75115
--- /dev/null
+++ b/deno/base/lib.ts
@@ -0,0 +1,30 @@
+function camelCaseToKebabCase(str: string): string {
+  return str.replace(/[A-Z]/g, (m) => "-" + m.toLowerCase());
+}
+
+function prependNonEmpty<T>(
+  object: T | null | undefined,
+  prefix: string = " ",
+): string {
+  if (object == null) return "";
+  const string = typeof object === "string" ? object : String(object);
+  return string.length === 0 ? "" : prefix + string;
+}
+
+export const StringUtils = Object.freeze({
+  camelCaseToKebabCase,
+  prependNonEmpty,
+});
+
+function toFileNameString(date: Date, dateOnly?: boolean): string {
+  const str = date.toISOString();
+  return dateOnly === true
+    ? str.slice(0, str.indexOf("T"))
+    : str.replaceAll(/:|\./g, "-");
+}
+
+export const DateUtils = Object.freeze(
+  {
+    toFileNameString,
+  } as const,
+);
diff --git a/deno/base/log.ts b/deno/base/log.ts
deleted file mode 100644
index 1a4942d..0000000
--- a/deno/base/log.ts
+++ /dev/null
@@ -1,164 +0,0 @@
-import { join } from "@std/path";
-
-import { toFileNameString } from "./date.ts";
-
-export type LogLevel = "error" | "warn" | "info";
-
-export interface LogEntry {
-  content: [unknown, ...unknown[]];
-  level?: LogLevel;
-  cause?: unknown;
-}
-
-export interface LogEntryBuilder {
-  withLevel(level: LogLevel): LogEntryBuilder;
-  withCause(cause: unknown): LogEntryBuilder;
-  setError(error: boolean): LogEntryBuilder;
-  write(): void;
-}
-
-export interface ExternalLogStream extends Disposable {
-  stream: WritableStream;
-}
-
-export class Logger {
-  #indentSize = 2;
-  #externalLogDir?: string;
-
-  #contextStack: { depth: number; level: LogLevel }[] = [
-    { depth: 0, level: "info" },
-  ];
-
-  get #context() {
-    return this.#contextStack.at(-1)!;
-  }
-
-  get indentSize() {
-    return this.#indentSize;
-  }
-
-  set indentSize(value: number) {
-    this.#indentSize = value;
-  }
-
-  get externalLogDir() {
-    return this.#externalLogDir;
-  }
-
-  set externalLogDir(value: string | undefined) {
-    this.#externalLogDir = value;
-    if (value != null) {
-      Deno.mkdirSync(value, {
-        recursive: true,
-      });
-    }
-  }
-
-  write(entry: LogEntry): void {
-    const { content, level, cause } = entry;
-    const [message, ...rest] = content;
-    console[level ?? this.#context.level](
-      " ".repeat(this.#indentSize * this.#context.depth) + String(message),
-      ...(cause != null ? [cause, ...rest] : rest),
-    );
-  }
-
-  push(entry: LogEntry): Disposable {
-    this.write(entry);
-    this.#contextStack.push({
-      depth: this.#context.depth + 1,
-      level: entry.level ?? this.#context.level,
-    });
-    return {
-      [Symbol.dispose]: () => {
-        this.#contextStack.pop();
-      },
-    };
-  }
-
-  info(message: unknown, ...args: unknown[]) {
-    this.write({ level: "info", content: [message, ...args] });
-  }
-
-  warn(message: unknown, ...args: unknown[]) {
-    this.write({ level: "warn", content: [message, ...args] });
-  }
-
-  error(message: unknown, ...args: unknown[]) {
-    this.write({ level: "error", content: [message, ...args] });
-  }
-
-  builder(message: unknown, ...args: unknown[]): LogEntryBuilder {
-    const entry: LogEntry = {
-      content: [message, ...args],
-      level: "info",
-      cause: undefined,
-    };
-    const builder: LogEntryBuilder = {
-      withCause: (cause) => {
-        entry.cause = cause;
-        return builder;
-      },
-      withLevel: (level) => {
-        entry.level = level;
-        return builder;
-      },
-      setError: (error) => {
-        if (error) entry.level = "error";
-        return builder;
-      },
-      write: () => {
-        this.write(entry);
-      },
-    };
-    return builder;
-  }
-
-  async createExternalLogStream(
-    name: string,
-    options?: {
-      noTime?: boolean;
-    },
-  ): Promise<ExternalLogStream> {
-    if (name.includes("/")) {
-      throw new Error(`External log stream's name (${name}) contains '/'.`);
-    }
-    if (this.#externalLogDir == null) {
-      throw new Error("External log directory is not set.");
-    }
-
-    const logPath = join(
-      this.#externalLogDir,
-      options?.noTime === true
-        ? name
-        : `${name}-${toFileNameString(new Date())}`,
-    );
-
-    const file = await Deno.open(logPath, {
-      read: false,
-      write: true,
-      append: true,
-      create: true,
-    });
-    return {
-      stream: file.writable,
-      [Symbol.dispose]: file[Symbol.dispose].bind(file),
-    };
-  }
-
-  async createExternalLogStreamsForProgram(
-    program: string,
-  ): Promise<{ stdout: WritableStream; stderr: WritableStream } & Disposable> {
-    const stdout = await this.createExternalLogStream(`${program}-stdout`);
-    const stderr = await this.createExternalLogStream(`${program}-stderr`);
-    return {
-      stdout: stdout.stream,
-      stderr: stderr.stream,
-      [Symbol.dispose]: () => {
-        stdout[Symbol.dispose]();
-        stderr[Symbol.dispose]();
-      },
-    };
-  }
-}
-
diff --git a/deno/base/text.ts b/deno/base/text.ts
deleted file mode 100644
index f3e4020..0000000
--- a/deno/base/text.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function camelCaseToKebabCase(str: string): string {
-  return str.replace(/[A-Z]/g, (m) => "-" + m.toLowerCase());
-}