.zshrc (lazy loading shell functions)

.zshrc

# Copyright (c) 2016-2018 Ming Qin (覃明) <https://github.com/QinMing>
# Open source under MIT LICENSE.

lazy_load() {
    # Act as a stub to another shell function/command. When first run, it will load the actual function/command then execute it.
    # E.g. This made my zsh load 0.8 seconds faster by loading `nvm` when "nvm", "npm" or "node" is used for the first time
    # $1: space separated list of alias to release after the first load
    # $2: file to source
    # $3: name of the command to run after it's loaded
    # $4+: argv to be passed to $3
    echo "Lazy loading $1 ..."

    # $1.split(' ') using the s flag. In bash, this can be simply ($1) #http://unix.stackexchange.com/questions/28854/list-elements-with-spaces-in-zsh
    # Single line won't work: local names=("${(@s: :)${1}}"). Due to http://stackoverflow.com/questions/14917501/local-arrays-in-zsh   (zsh 5.0.8 (x86_64-apple-darwin15.0))
    local -a names
    if [[ -n "$ZSH_VERSION" ]]; then
        names=("${(@s: :)${1}}")
    else
        names=($1)
    fi
    unalias "${names[@]}"
    . $2
    shift 2
    $*
}

group_lazy_load() {
    local script
    script=$1
    shift 1
    for cmd in "$@"; do
        alias $cmd="lazy_load \"$*\" $script $cmd"
    done
}

export NVM_DIR=~/.nvm
group_lazy_load $HOME/.nvm/nvm.sh nvm node npm truffle gulp yarn

export PATH="$PATH:$HOME/.rvm/bin" # Add RVM to PATH for scripting
group_lazy_load $HOME/.rvm/scripts/rvm rvm irb rake rails

unset -f group_lazy_load

# simple python virtual environment wrapper
alias ve="lazy_load 've' $HOME/git/simple-virtualenv-wrapper/ve.sh ve"

Ah, back to my old zsh startup speed, thanks!

Why i got Unrecognized command line argument: nvm node npm when input nvm each time I open a new window?
but after source ~/.bash_profile everything works fine ~

I have the same problem. Works fine only after I source ~/.zshrc again. Any ideas?

awesome!
thanks!

Wow, thank you!!

Works fine but every time I open a new terminal I got this error

/home/usrname/.nvm/nvm.sh:2348: defining function based on alias `nvm'
/home/username/.nvm/nvm.sh:2348: parse error near `()'

and it repeat more than 50 times

my zsh thing used to take around 1.5 seconds not its like 0.4 seconds AWESOME

Works fine but every time I open a new terminal I got this error

/home/usrname/.nvm/nvm.sh:2348: defining function based on alias `nvm'
/home/username/.nvm/nvm.sh:2348: parse error near `()'

and it repeat more than 50 times

Did you ever get this resolved? Here we are in 2024 and I'm getting this! (NOTE: Mine is "nvm.sh:2833")

Hi @moghaazi and @sethderrick

I couldn't reproduce. I just pulled the latest nvm, and was still able to use this tool as normal.
I'm wondering if the issue you are facing is specific to nvm itself. Are you able to run . $HOME/.nvm/nvm.sh directly?

disclaimer: I haven't used nvm or node.js for years