👍 Isolate function module from vim

Author: lambdalisue

function/buffer.ts

@@ -0,0 +1,87 @@
+import { Denops } from "../deps.ts";
+
+export async function bufadd(
+  denops: Denops,
+  name: string,
+): Promise<number> {
+  const bufnr = await denops.call("bufadd", name);
+  return bufnr as number;
+}
+
+export async function bufexists(
+  denops: Denops,
+  name: string | number,
+): Promise<boolean> {
+  const result = await denops.call("bufexists", name) as number;
+  return !!result;
+}
+
+export async function buflisted(
+  denops: Denops,
+  name: string | number,
+): Promise<boolean> {
+  const result = await denops.call("buflisted", name) as number;
+  return !!result;
+}
+
+export async function bufload(
+  denops: Denops,
+  name: string | number,
+): Promise<void> {
+  await denops.call("bufload", name);
+}
+
+export async function bufloaded(
+  denops: Denops,
+  name: string | number,
+): Promise<boolean> {
+  const result = await denops.call("bufloaded", name) as number;
+  return !!result;
+}
+
+export async function bufname(
+  denops: Denops,
+  name?: string | number,
+): Promise<string> {
+  return await denops.call("bufname", name) as string;
+}
+
+export async function bufnr(
+  denops: Denops,
+  name: string | number,
+): Promise<number> {
+  return await denops.call("bufnr", name) as number;
+}
+
+export async function bufwinid(
+  denops: Denops,
+  name: string | number,
+): Promise<number> {
+  return await denops.call("bufwinid", name) as number;
+}
+
+export async function bufwinnr(
+  denops: Denops,
+  name: string | number,
+): Promise<number> {
+  return await denops.call("bufwinnr", name) as number;
+}
+
+export async function getbufline(
+  denops: Denops,
+  name: string | number,
+  lnum: string | number,
+  end?: string | number,
+): Promise<string[]> {
+  return await denops.call("getbufline", name, lnum, end) as string[];
+}
+
+export async function setbufline(
+  denops: Denops,
+  name: string | number,
+  lnum: string | number,
+  text: string | string[],
+): Promise<boolean> {
+  const result = await denops.call("setbufline", name, lnum, text) as number;
+  return !!result;
+}

function/common.ts

@@ -0,0 +1,51 @@
+import { Denops } from "../deps.ts";
+
+export async function exists(
+  denops: Denops,
+  name: string,
+): Promise<boolean> {
+  const result = await denops.call("exists", name) as number;
+  return !!result;
+}
+
+export async function has(
+  denops: Denops,
+  name: string,
+  check?: boolean,
+): Promise<boolean> {
+  if (check) {
+    const result = await denops.call("has", name, 1) as number;
+    return !!result;
+  }
+  const result = await denops.call("has", name) as number;
+  return !!result;
+}
+
+export async function getline(
+  denops: Denops,
+  lnum: string | number,
+): Promise<string>;
+export async function getline(
+  denops: Denops,
+  lnum: string | number,
+  end: string | number,
+): Promise<string[]>;
+export async function getline(
+  denops: Denops,
+  lnum: string | number,
+  end?: string | number,
+): Promise<string | string[]> {
+  if (end) {
+    return await denops.call("getline", lnum, end) as string[];
+  }
+  return await denops.call("getline", lnum) as string;
+}
+
+export async function setline(
+  denops: Denops,
+  lnum: string | number,
+  text: string | string[],
+): Promise<boolean> {
+  const result = await denops.call("setline", lnum, text) as number;
+  return !!result;
+}

function/mod.ts

@@ -0,0 +1,2 @@
+export * from "./buffer.ts";
+export * from "./common.ts";

vim/function.ts

@@ -1,6 +1,5 @@
 import { Context, Denops, Dispatcher } from "../deps.ts";
 import { autocmd, AutocmdHelper } from "./autocmd.ts";
-import { FunctionHelper } from "./function.ts";
 
 /**
  * Vim is a facade instance visible from each denops plugins for
@@ -13,11 +12,8 @@ import { FunctionHelper } from "./function.ts";
 export class Vim {
   #denops: Denops;
 
-  readonly fn: FunctionHelper;
-
   constructor(denops: Denops) {
     this.#denops = denops;
-    this.fn = new FunctionHelper(denops);
   }
 
   /**