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shfmt

shfmt documentation

sh - GitHub

Configuration in Mega-Linter

Variable Description Default value
BASH_SHFMT_ARGUMENTS User custom arguments to add in linter CLI call
Ex: -s --foo "bar"
BASH_SHFMT_FILTER_REGEX_INCLUDE Custom regex including filter
Ex: (src\|lib)		 Include every file
BASH_SHFMT_FILTER_REGEX_EXCLUDE Custom regex excluding filter
Ex: (test\|examples)		 Exclude no file
BASH_SHFMT_CLI_LINT_MODE Override default CLI lint mode
- file: Calls the linter for each file
- list_of_files: Call the linter with the list of files as argument
- project: Call the linter from the root of the project		 {linter.cli_lint_mode}
BASH_SHFMT_FILE_EXTENSIONS Allowed file extensions. "*" matches any extension, "" matches empty extension. Empty list excludes all files
Ex: [".py", ""]		 [".sh", ".bash", ".dash", ".ksh"]
BASH_SHFMT_FILE_NAMES_REGEX File name regex filters. Regular expression list for filtering files by their base names using regex full match. Empty list includes all files
Ex: ["Dockerfile(-.+)?", "Jenkinsfile"]		 Include every file
BASH_SHFMT_PRE_COMMANDS List of bash commands to run before the linter None
BASH_SHFMT_POST_COMMANDS List of bash commands to run after the linter None
BASH_SHFMT_DISABLE_ERRORS Run linter but consider errors as warnings true
BASH_SHFMT_DISABLE_ERRORS_IF_LESS_THAN Maximum number of errors allowed 0

IDE Integration

Use shfmt in your favorite IDE to catch errors before Mega-Linter !

IDE Extension Name Install
Atom format-shell Visit Web Site
Emacs emacs-shfmt Visit Web Site
IDEA shell-scripts Visit Web Site
micro micro Visit Web Site
Sublime Text Sublime-Pretty-Shell Visit Web Site
vim vim-shfmt Visit Web Site
Visual Studio Code shell-format Install in VsCode

Mega-Linter Flavours

This linter is available in the following flavours

Flavor Description Embedded linters Info
all Default Mega-Linter Flavor 94 Docker Image Size (tag) Docker Pulls
dart Optimized for DART based projects 41 Docker Image Size (tag) Docker Pulls
documentation Mega-Linter for documentation projects 40 Docker Image Size (tag) Docker Pulls
dotnet Optimized for C, C++, C# or VB based projects 47 Docker Image Size (tag) Docker Pulls
go Optimized for GO based projects 42 Docker Image Size (tag) Docker Pulls
java Optimized for JAVA based projects 42 Docker Image Size (tag) Docker Pulls
javascript Optimized for JAVASCRIPT or TYPESCRIPT based projects 49 Docker Image Size (tag) Docker Pulls
php Optimized for PHP based projects 44 Docker Image Size (tag) Docker Pulls
python Optimized for PYTHON based projects 49 Docker Image Size (tag) Docker Pulls
ruby Optimized for RUBY based projects 41 Docker Image Size (tag) Docker Pulls
rust Optimized for RUST based projects 41 Docker Image Size (tag) Docker Pulls
salesforce Optimized for Salesforce based projects 43 Docker Image Size (tag) Docker Pulls
scala Optimized for SCALA based projects 41 Docker Image Size (tag) Docker Pulls
swift Optimized for SWIFT based projects 41 Docker Image Size (tag) Docker Pulls
terraform Optimized for TERRAFORM based projects 45 Docker Image Size (tag) Docker Pulls

Behind the scenes

How are identified applicable files

  • File extensions: .sh, .bash, .dash, .ksh

How the linting is performed

  • shfmt is called one time by identified file

Example calls

shfmt -d myfile.sh

shfmt -w myfile.sh

Help content

usage: shfmt [flags] [path ...]

shfmt formats shell programs. If the only argument is a dash ('-') or no
arguments are given, standard input will be used. If a given path is a
directory, all shell scripts found under that directory will be used.

  -version  show version and exit

  -l        list files whose formatting differs from shfmt's
  -w        write result to file instead of stdout
  -d        error with a diff when the formatting differs
  -s        simplify the code
  -mn       minify the code to reduce its size (implies -s)

Parser options:

  -ln str        language variant to parse (bash/posix/mksh/bats, default "bash")
  -p             shorthand for -ln=posix
  -filename str  provide a name for the standard input file

Printer options:

  -i uint   indent: 0 for tabs (default), >0 for number of spaces
  -bn       binary ops like && and | may start a line
  -ci       switch cases will be indented
  -sr       redirect operators will be followed by a space
  -kp       keep column alignment paddings
  -fn       function opening braces are placed on a separate line

Utilities:

  -f        recursively find all shell files and print the paths
  -tojson   print syntax tree to stdout as a typed JSON

For more information, see 'man shfmt' and https://github.com/mvdan/sh.

Installation on mega-linter Docker image

  • Dockerfile commands :
ENV GO111MODULE=on
RUN go get mvdan.cc/sh/v3/cmd/shfmt@v3.3.1

Example success log

Results of shfmt linter (version 3.2.1)
See documentation on https://megalinter.github.io/descriptors/bash_shfmt/
-----------------------------------------------

[SUCCESS] .automation/test/shell_shfmt/shell-shfmt_good_1.sh

Example error log

Results of shfmt linter (version 3.2.1)
See documentation on https://megalinter.github.io/descriptors/bash_shfmt/
-----------------------------------------------

[ERROR] .automation/test/shell_shfmt/shell-shfmt_bad_1.sh
    --- .automation/test/shell_shfmt/shell-shfmt_bad_1.sh.orig
    +++ .automation/test/shell_shfmt/shell-shfmt_bad_1.sh
    @@ -8,10 +8,10 @@

     # Check the shell
     if [ ${ERROR_CODE} -ne 0 ]; then
    -  echo "We did it!"
    -  exit 0
    +    echo "We did it!"
    +    exit 0
     else
    -  echo "We done goofed it..."
    -  echo "${HELLO_WORLD}"
    -  exit 1
    +    echo "We done goofed it..."
    +    echo "${HELLO_WORLD}"
    +    exit 1
     fi