Add support for --simplify shfmt option

This wasn't included initially as it does more than just format code.
However, its absence has been noted in a comment on the last PR:
#1136 (comment)
and it is a valid `shfmt` option, so support has been added.

There's a similar option (`-mn` or `--minify`), but this will not be
implemented as its output is not intended for human consumption and it
will essentially ignore all other options presented anyway.

server/src/__tests__/config.test.ts

@@ -19,6 +19,7 @@ describe('ConfigSchema', () => {
           "funcNextLine": false,
           "keepPadding": false,
           "path": "shfmt",
+          "simplifyCode": false,
           "spaceRedirects": false,
         },
       }
@@ -39,6 +40,7 @@ describe('ConfigSchema', () => {
           funcNextLine: true,
           keepPadding: true,
           path: 'myshfmt',
+          simplifyCode: true,
           spaceRedirects: true,
         },
       }),
@@ -63,6 +65,7 @@ describe('ConfigSchema', () => {
           "funcNextLine": true,
           "keepPadding": true,
           "path": "myshfmt",
+          "simplifyCode": true,
           "spaceRedirects": true,
         },
       }
@@ -97,6 +100,7 @@ describe('getConfigFromEnvironmentVariables', () => {
           "funcNextLine": false,
           "keepPadding": false,
           "path": "shfmt",
+          "simplifyCode": false,
           "spaceRedirects": false,
         },
       }
@@ -125,6 +129,7 @@ describe('getConfigFromEnvironmentVariables', () => {
           "funcNextLine": false,
           "keepPadding": false,
           "path": "",
+          "simplifyCode": false,
           "spaceRedirects": false,
         },
       }
@@ -162,6 +167,7 @@ describe('getConfigFromEnvironmentVariables', () => {
           "funcNextLine": false,
           "keepPadding": false,
           "path": "/path/to/shfmt",
+          "simplifyCode": false,
           "spaceRedirects": false,
         },
       }

server/src/config.ts

@@ -58,6 +58,9 @@ export const ConfigSchema = z.object({
       // (Deprecated) Keep column alignment padding.
       keepPadding: z.boolean().default(false),
 
+      // Simplify code before formatting.
+      simplifyCode: z.boolean().default(false),
+
       // Follow redirection operators with a space.
       spaceRedirects: z.boolean().default(false),
     })
@@ -85,6 +88,7 @@ export function getConfigFromEnvironmentVariables(): {
       caseIndent: toBoolean(process.env.SHFMT_CASE_INDENT),
       funcNextLine: toBoolean(process.env.SHFMT_FUNC_NEXT_LINE),
       keepPadding: toBoolean(process.env.SHFMT_KEEP_PADDING),
+      simplifyCode: toBoolean(process.env.SHFMT_SIMPLIFY_CODE),
       spaceRedirects: toBoolean(process.env.SHFMT_SPACE_REDIRECTS),
     },
   }

server/src/shfmt/__tests__/index.test.ts

@@ -87,6 +87,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next() {
@@ -136,6 +138,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next() {
@@ -185,6 +189,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next() {
@@ -235,6 +241,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next() {
@@ -285,6 +293,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next() {
@@ -335,6 +345,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next()
@@ -386,6 +398,60 @@ describe('formatter', () => {
       echo four  five  six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
+      echo space redirects >/dev/null
+
+      function next() {
+        echo line
+      }
+      ",
+          "range": {
+            "end": {
+              "character": 2147483647,
+              "line": 2147483647,
+            },
+            "start": {
+              "character": 0,
+              "line": 0,
+            },
+          },
+        },
+      ]
+    `)
+  })
+
+  it('should format after simplifying the code when simplifyCode is true', async () => {
+    const [result] = await getFormattingResult({
+      document: FIXTURE_DOCUMENT.SHFMT,
+      formatOptions: { tabSize: 2, insertSpaces: true },
+      shfmtConfig: { simplifyCode: true },
+    })
+    expect(result).toMatchInlineSnapshot(`
+      [
+        {
+          "newText": "#!/bin/bash
+      set -ueo pipefail
+
+      if [ -z "$arg" ]; then
+        echo indent
+      fi
+
+      echo binary &&
+        echo next line
+
+      case "$arg" in
+      a)
+        echo case indent
+        ;;
+      esac
+
+      echo one two three
+      echo four five six
+      echo seven eight nine
+
+      [[ $simplify == "simplify" ]]
+
       echo space redirects >/dev/null
 
       function next() {
@@ -436,6 +502,8 @@ describe('formatter', () => {
       echo four five six
       echo seven eight nine
 
+      [[ "$simplify" == "simplify" ]]
+
       echo space redirects > /dev/null
 
       function next() {
@@ -466,6 +534,7 @@ describe('formatter', () => {
         caseIndent: true,
         funcNextLine: true,
         keepPadding: true,
+        simplifyCode: true,
         spaceRedirects: true,
       },
     })
@@ -492,6 +561,8 @@ describe('formatter', () => {
       echo four  five  six
       echo seven eight nine
 
+      [[ $simplify == "simplify"   ]]
+
       echo space redirects > /dev/null
 
       function next()

server/src/shfmt/index.ts

@@ -71,6 +71,7 @@ export class Formatter {
     if (shfmtConfig?.caseIndent) args.push('-ci') // --case-indent
     if (shfmtConfig?.funcNextLine) args.push('-fn') // --func-next-line
     if (shfmtConfig?.keepPadding) args.push('-kp') // --keep-padding
+    if (shfmtConfig?.simplifyCode) args.push('-s') // --simplify
     if (shfmtConfig?.spaceRedirects) args.push('-sr') // --space-redirects
 
     logger.debug(`Shfmt: running "${this.executablePath} ${args.join(' ')}"`)

testing/fixtures/shfmt.sh

@@ -18,6 +18,8 @@ echo one   two   three
 echo four  five  six
 echo seven eight nine
 
+[[ "$simplify" == "simplify" ]]
+
 echo space redirects>  /dev/null
 
 function next(){

vscode-client/package.json

@@ -104,6 +104,11 @@
           "description": "(Deprecated) Keep column alignment padding.",
           "markdownDescription": "**([Deprecated](https://github.com/mvdan/sh/issues/658))** Keep column alignment padding."
         },
+        "bashIde.shfmt.simplifyCode": {
+          "type": "boolean",
+          "default": false,
+          "description": "Simplify code before formatting."
+        },
         "bashIde.shfmt.spaceRedirects": {
           "type": "boolean",
           "default": false,