.zprofile.sh

# .zprofile

PATH="${HOME}/.local/bin:${PATH}"

function () {
    local BREW_PREFIX="${HOME}/.local/opt/homebrew"
    
    alias brew="${BREW_PREFIX}/bin/brew"
    
    function () {
        export HOMEBREW_PREFIX="${BREW_PREFIX}"
        export HOMEBREW_CELLAR="${BREW_PREFIX}/Cellar"
        export HOMEBREW_REPOSITORY="${BREW_PREFIX}"
    }
}

if [ ! "${GPG_TTY+set}" ]
then
    function () {
        local TMP_TTY="$(tty 2> /dev/null)"
        
        if [ ! -z "${TMP_TTY}" ]
        #    ^^^^
        #    Non-empty string
        then
            export GPG_TTY="${TMP_TTY}"
            return
        fi
        
        echo >& 2 "${0}: failed to set GPG_TTY"
    }
fi

.zshrc.sh

# .zshrc

if [ ! -z "${HOMEBREW_PREFIX}" ]
#    ^^^^
#    Non-empty string
then
    FPATH="${HOMEBREW_PREFIX}/share/zsh/site-functions:${FPATH}"
    
    autoload -Uz compinit
    compinit
fi

brew.md

Homebrew

Installation

Installing brew

root@macbook-pro ~ % mkdir '.local'

root@macbook-pro ~ % cd .local/
root@macbook-pro .local % 

root@macbook-pro .local % mkdir bin
root@macbook-pro .local % mkdir lib
root@macbook-pro .local % mkdir opt
root@macbook-pro .local % mkdir share

root@macbook-pro .local % cd opt/
root@macbook-pro opt % 

root@macbook-pro opt % mkdir homebrew

Run the following line:

curl -L 'https://github.com/Homebrew/brew/tarball/master' | tar xz --strip 1 -C homebrew/

Setting up the environment

% alias brew="${HOME}/.local/opt/homebrew/bin/brew"

Verify the previous line ran as expected:

% which brew
brew: aliased to /Users/root/.local/opt/homebrew/bin/brew

% export PATH="${HOME}/.local/bin:${PATH}"

Verify the previous line ran as expected:

% echo "PATH: ${PATH}"
PATH: /Users/root/.local/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

@drazisil