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direnvrc

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#------------------------------------------------------------------
# THIS FILE IS GENERATED (To edit please open file from link above)
#------------------------------------------------------------------

export alias

  • since alias definitions in envrc are not put into the respective shell, an alternative is to create a shell script that behaves similar to an alias definition. this is done with this function.
  • it creates a shell script in the path with the given name, executing an arbitrary command sequence
  • example: export_alias zz "# do ls with -la as default parameter" "ls -la" defines the alias (shell command) zz that will execute ls -la passing any additional parameters after -la e.g.: zz *.bat will actually execute ls -la *.bat additionally # do ls with -la as default parameter is defined as comment for this command (put into the second line of the shell script)
# work around to define aliases within .envrc
# (see https://github.com/direnv/direnv/issues/73#issuecomment-174295790)
#
# Example: export_alias zz "# do ls with -la as default parameter" "ls -la"
export_alias() {
  local name=$1
  shift
  local description=""
  if [[ $1 == \#* ]]; then
    description="$1"
    shift
  else
    description="# no description available"
  fi
  local PROJECT_DIR=$(expand_path .)
  local alias_dir=$PROJECT_DIR/.direnv/aliases
  local target="$alias_dir/$name"
  mkdir -p "$alias_dir"
  PATH_add "$alias_dir"
  echo "#! /usr/bin/env -S bash -e" > "$target"
  echo "$description" >> "$target"
  echo "$@ \$@" >> "$target"
  chmod +x "$target"
}

guix

  • allows for guix integration in .envrc to define a guix environment
  • example usage (for ebook decryption environment) 
    use_guix --ad-hoc \
  python2 \
  python2-cryptography \
  python2-pycrypto
    
# allow for guix environment execution (e.g. 'use_guix --ad-hoc guile')
use_guix() {
  eval "$(guix environment "$@" --search-paths)"
}

nix