hsh

My implementation of POSIX-like shell in C++26 (WIP)

build

• configure

cmake -B build -G Ninja

• build

cmake --build build

• run

# interactive
build/src/hsh

# batch mode
build/src/hsh -c 'echo hello'

• run tests

# build tests
cmake --build build --target hsh_test

# run all tests
ctest --test-dir build --output-on-failure

# run with filter
ctest --test-dir build --output-on-failure -R SCOPE

• formatting

just fmt

current state of the project

Note: although most basic functionalities are working, they are not well tested for a complex case. There are a lot of edge cases where tests did not cover.

Done

• basic shell syntax parsing
• pipelines |
• background jobs &
• redirections >
• control statement if for while until case
• logical expression &&
• tilde expansion ~
• variable expansion $VAR
• pathname expansion *.txt
• brace expansion {a..z}
• arithmetic expansion $((1+1))
• special parameters $@
• builtin commands:
  • cd echo exit export jobs fg bg pwd
• basic prompt [user@host pwd]$
• repl
• command line arguments hsh --help
• batch mode hsh -c 'echo hello'
• subshells (...)

TODO

• complex parameter expansion ${VAR#PATTERN}
• command substitution $(...)
• process substitution <(...)
• here-doc, here-string <<EOF
• command grouping {... ; ...}
• functions and scripts function f() {...}
• more builtin commands
• command history
• tab completion
• advanced prompt
• and more...
• core::result