style(util): improve formatCmd (google#1069)

Author: antongolub

src/cli.ts

@@ -217,15 +217,14 @@ export function injectGlobalRequire(origin: string) {
 }
 
 export function transformMarkdown(buf: Buffer | string): string {
-  const source = buf.toString()
   const output = []
   const tabRe = /^(  +|\t)/
   const codeBlockRe =
     /^(?<fence>(`{3,20}|~{3,20}))(?:(?<js>(js|javascript|ts|typescript))|(?<bash>(sh|shell|bash))|.*)$/
   let state = 'root'
   let codeBlockEnd = ''
   let prevLineIsEmpty = true
-  for (const line of source.split(/\r?\n/)) {
+  for (const line of buf.toString().split(/\r?\n/)) {
     switch (state) {
       case 'root':
         if (tabRe.test(line) && prevLineIsEmpty) {

src/util.ts

@@ -277,23 +277,19 @@ export function formatCmd(cmd?: string): string {
   }
 
   function space() {
-    if (/\s/.test(ch)) return space
-    return root
+    return /\s/.test(ch) ? space : root
   }
 
   function word() {
-    if (/[\w/.]/i.test(ch)) return word
-    return root
+    return /[\w/.]/i.test(ch) ? word : root
   }
 
   function syntax() {
-    if (isSyntax(ch)) return syntax
-    return root
+    return isSyntax(ch) ? syntax : root
   }
 
   function dollar() {
-    if (ch === "'") return str
-    return root
+    return ch === "'" ? str : root
   }
 
   function str() {
@@ -311,13 +307,11 @@ export function formatCmd(cmd?: string): string {
   }
 
   function strDouble() {
-    if (ch === '"') return strEnd
-    return strDouble
+    return ch === '"' ? strEnd : strDouble
   }
 
   function strSingle() {
-    if (ch === "'") return strEnd
-    return strSingle
+    return ch === "'" ? strEnd : strSingle
   }
 
   function strEnd() {