# Iteration 3: Pipelines - comprehensive edge cases
# === Basic pipelines ===
=== simple pipe
echo foo | cat
---
(pipe (command (word "echo") (word "foo")) (command (word "cat")))
---
=== triple pipe
echo foo | grep bar | wc -l
---
(pipe (command (word "echo") (word "foo")) (pipe (command (word "grep") (word "bar")) (command (word "wc") (word "-l"))))
---
=== quad pipe
cat file | grep pattern | sort | uniq
---
(pipe (command (word "cat") (word "file")) (pipe (command (word "grep") (word "pattern")) (pipe (command (word "sort")) (command (word "uniq")))))
---
=== five stage pipe
ps aux | grep python | awk '{print $2}' | head -5 | xargs echo
---
(pipe (command (word "ps") (word "aux")) (pipe (command (word "grep") (word "python")) (pipe (command (word "awk") (word "'{print $2}'")) (pipe (command (word "head") (word "-5")) (command (word "xargs") (word "echo"))))))
---
# === Pipes with paths ===
=== pipe with absolute paths
/usr/bin/cat file | /usr/bin/grep foo
---
(pipe (command (word "/usr/bin/cat") (word "file")) (command (word "/usr/bin/grep") (word "foo")))
---
=== pipe with relative paths
./generate | ./process | ./output
---
(pipe (command (word "./generate")) (pipe (command (word "./process")) (command (word "./output"))))
---
# === Pipes with arguments ===
=== pipe with many arguments
ls -la /tmp | grep -v total | head -n 10
---
(pipe (command (word "ls") (word "-la") (word "/tmp")) (pipe (command (word "grep") (word "-v") (word "total")) (command (word "head") (word "-n") (word "10"))))
---
=== pipe with quoted args
echo "hello world" | grep hello
---
(pipe (command (word "echo") (word "\"hello world\"")) (command (word "grep") (word "hello")))
---
=== pipe with single quoted args
echo 'pattern with spaces' | grep 'pattern'
---
(pipe (command (word "echo") (word "'pattern with spaces'")) (command (word "grep") (word "'pattern'")))
---
=== pipe with mixed quotes
echo "foo" | grep 'foo' | cat
---
(pipe (command (word "echo") (word "\"foo\"")) (pipe (command (word "grep") (word "'foo'")) (command (word "cat"))))
---
# === Pipes with special characters ===
=== pipe with glob patterns
ls *.txt | wc -l
---
(pipe (command (word "ls") (word "*.txt")) (command (word "wc") (word "-l")))
---
=== pipe with equals in args
env | grep PATH=
---
(pipe (command (word "env")) (command (word "grep") (word "PATH=")))
---
# === Whitespace variations ===
=== pipe no spaces around
echo foo|cat
---
(pipe (command (word "echo") (word "foo")) (command (word "cat")))
---
=== pipe space before only
echo foo |cat
---
(pipe (command (word "echo") (word "foo")) (command (word "cat")))
---
=== pipe space after only
echo foo| cat
---
(pipe (command (word "echo") (word "foo")) (command (word "cat")))
---
=== pipe multiple spaces
echo foo | cat
---
(pipe (command (word "echo") (word "foo")) (command (word "cat")))
---
# === From tree-sitter-bash ===
=== pipe with head
cat foo | grep -v bar
---
(pipe (command (word "cat") (word "foo")) (command (word "grep") (word "-v") (word "bar")))
---
=== pipe to head
cat baz | head -n 1
---
(pipe (command (word "cat") (word "baz")) (command (word "head") (word "-n") (word "1")))
---