zshrc clever functions

zshrc

# cd to files' directories
cd() {
  local to="${1:-$HOME}"
  if [ -f "$to" ]; then
    to="$(dirname $to)"
  fi
  builtin cd "$to"
}

zshrc.zsh

upfind() {                                                                                                                                                                   
  local previous=                                                                                                                                                            
  local current=$PWD                                                                                                                                                         
                                                                                                                                                                             
  if [[ $# -ne 1 ]];then                                                                                                                                                     
    echo "$0 FILE_NAME"                                                                                                                                                      
    return 1                                                                                                                                                                 
  fi                                                                                                                                                                         
                                                                                                                                                                             
  while [[ -d $current && $current != $previous ]]; do                                                                                                                       
    local target_path=$current/$1                                                                                                                                            
    if [[ -f $target_path ]]; then                                                                                                                                           
      echo $target_path                                                                                                                                                      
      return 0                                                                                                                                                               
    else                                                                                                                                                                     
      previous=$current                                                                                                                                                      
      current=$current:h                                                                                                                                                     
    fi                                                                                                                                                                       
  done                                                                                                                                                                       
  return 1                                                                                                                                                                   
} 

# build project from subdirectory
ninja(){                                                                                                                                                                     
  local build_path="$(dirname "$(upfind "build.ninja")")"                                                                                                                    
  command ninja -C "${build_path:-.}" "$@"                                                                                                                                   
}                                                                                                                                                                            
make(){                                                                                                                                                                      
  local build_path="$(dirname "$(upfind "Makefile")")"                                                                                                                       
  command make -C "${build_path:-.}" "$@"                                                                                                                                    
}