let completion ignore case and search command by leading string

.inputrc

# user defined inputrc

find_git_branch () {
  local dir=. head
  git_branch=''
  until [ "$dir" -ef / ]; do
    if [ -f "$dir/.git/HEAD" ]; then
      head=$(< "$dir/.git/HEAD")
      if [[ $head = ref:\ refs/heads/* ]]; then
        git_branch=" (${head#*/*/})"
      elif [[ $head != '' ]]; then
        git_branch=" → (detached)"
      else
        git_branch=" → (unknow)"
      fi
      return
    fi
    dir="../$dir"
  done
}

PROMPT_COMMAND="find_git_branch; $PROMPT_COMMAND"

# echo $git_branch

autoload -Uz vcs_info
precmd() { vcs_info }

zstyle ':vcs_info:git:*' formats 'on branch %b'

setopt PROMPT_SUBST
PROMPT='%n in ${PWD/#$HOME/~} ${vcs_info_msg_0_} > '

# auto completion
set completion-ignore-case on
set show-all-if-ambiguous on

# prefix-based searching
# below works in bash
# "\e[A": history-search-backward
# "\e[B": history-search-forward

zstyle ':completion:*' matcher-list '' 'm:{a-zA-Z}={A-Za-z}' 'r:|[._-]=* r:|=*' 'l:|=* r:|=*'

# prefix-based searching
# below works in zsh
bindkey '^[[A' up-line-or-search
bindkey '^[[B' down-line-or-search

# export environment