===============================
Commands
===============================

whoami

---

(program
  (command (command_name)))

===============================
Commands with arguments
===============================

cat file1.txt
cat -n file1.txt file2.txt

---

(program
  (command (command_name) (argument))
  (command (command_name) (argument) (argument) (argument)))

===============================
Commands with quoted arguments
===============================

echo "hello $(whoami), this is $(uname)"
echo 'hi'

---

(program
  (command (command_name) (quoted_argument
    (command_substitution (command (command_name)))
    (command_substitution (command (command_name)))))
  (command (command_name) (single_quoted_argument)))

===============================
Quoted command names
===============================

"$a/$b" c

---

(program
  (command (quoted_argument (expansion (variable_name)) (expansion (variable_name))) (argument)))

===============================
Commands with numeric arguments
===============================

exit 1

---

(program
  (command (command_name) (argument)))

===================================
Commands with environment variables
===================================

VAR1=1 ./script/test
VAR1=a VAR2="ok" git diff --word-diff=color

---

(program
  (command
    (environment_variable_assignment (variable_name) (argument))
    (command_name))
  (command
    (environment_variable_assignment (variable_name) (argument))
    (environment_variable_assignment (variable_name) (quoted_argument))
    (command_name)
    (argument)
    (argument)))

===================================
Empty environment variables
===================================

VAR1=
VAR2= echo

---

(program
  (environment_variable_assignment (variable_name))
  (command (environment_variable_assignment (variable_name)) (command_name)))

===================================
Pipelines
===================================

whoami | cat
cat foo | grep -v bar

---

(program
  (pipeline
    (command (command_name))
    (command (command_name)))
  (pipeline
    (command (command_name) (argument))
    (command (command_name) (argument) (argument))))

===================================
Lists
===================================

a | b && c && d; d e f || e g

---

(program
  (list
    (list
      (pipeline
        (command (command_name))
        (command (command_name)))
      (command (command_name)))
    (command (command_name)))
  (list
    (command (command_name) (argument) (argument))
    (command (command_name) (argument))))

===============================
File redirects
===============================

whoami > /dev/null
cat a b > /dev/null
2>&1 whoami

---

(program
  (command
    (command_name)
    (file_redirect (argument)))
  (command
    (command_name)
    (argument)
    (argument)
    (file_redirect (argument)))
  (command
    (file_redirect (file_descriptor) (argument))
    (command_name)))

===============================
Variable expansions
===============================

cat $FOO

---

(program
  (command
    (command_name)
    (expansion (variable_name))))

===============================
Variable expansion operators
===============================

cat ${BAR} ${ABC=def} ${GHI:?jkl}

---

(program
  (command
    (command_name)
    (operator_expansion (variable_name))
    (operator_expansion (variable_name) (argument))
    (operator_expansion (variable_name) (argument))))

===============================
Heredoc redirects
===============================

node <<JS
console.log("hi")
JS

bash -c <<JS
echo hi
JS

---

(program
  (command
    (command_name)
    (heredoc_redirect (heredoc)))
  (command
    (command_name)
    (argument)
    (heredoc_redirect (heredoc))))

===============================
Heredocs with variables
===============================

node <<JS
a $B ${C}
JS

exit

---

(program
  (command
    (command_name)
    (heredoc_redirect (heredoc
      (expansion (variable_name))
      (operator_expansion (variable_name)))))
  (command (command_name)))