tip

#!/bin/bash

ROOT_DIR=$(dirname "$0")
DATA_DIR="${ROOT_DIR}/data/tip"

function after_my() {
  xdg-open http://139.199.4.119/book/
}

# function after_bash() {
#   xdg-open "https://learnxinyminutes.com/docs/bash/"
# }

function usage() {
  echo 'Usage:
$ tip bash | top | ps | du | systemctl | ulimit | egrep | grep | tail | watch | date
    jmap | jstack | jstat | keytool | sbt
    curl | svn | ssh | git | mysql | dot | xclip | iconv | rg 
    docker | docker-compose
    realize | dep | npm | n
    go | go_nil
    cargo | rustup
    consul | nginx
    buffalo
    centos
    semantic_version | uml
    my'

  echo "all tip list from $DATA_DIR"
  (
    cd "$DATA_DIR"
    i=0
    for x in $(exa -rs created); do
      printf "\t%-16s" "${x:0:-3}"
 
      let i=i+1
      if [ $((i % 5)) -eq 0 ]; then
           echo ""
      fi
    done
  )
  echo ""
}

###################################
_fn_exists() {
  declare -f -F $1 > /dev/null
  return $?
}

_try_fn() {
  _fn_exists "$1" && eval "$1"
}

task="$1"

if [ -z "$task" ]; then
  usage "$DATA_DIR"
else
  f="$DATA_DIR/$task.md"
  if [ -e "$f" ]; then
    printf ">read %s\n...\n" "$f"
    _try_fn "before_$1"

    command -v mdcat >/dev/null 2>&1
    if [ "$?" = "0" ];then
      mdcat "$f"
    else
      cat "$f"
    fi
    printf "\n\n"

    _try_fn "after_$1"
  else
    usage
  fi
fi