Migrate diary from yyyy-mm-dd.md to multi-sub directory architecture for "mattn/calendar-vim" plugin.

migrate-diary-to-sub-dir.sh

#!/bin/bash
# =============================================================================
#  Author: Chu-Siang Lai / chusiang (at) drx.tw
#  Blog: http://note.drx.tw
#  Filename: migrate-diary-to-sub-dir.sh
#  Modified: 2023-09-04 15:52
#  Description: Migrate diary from vimwiki/obsidian format to multi-sub
#               directory architecture for "mattn/calendar-vim" plugin, and
#               only review/edit via Vim.
#  Reference: https://github.com/chusiang/vimrc/commit/faca1de7e49f9a51cba3805d4ba3b2fc8a449909
# =============================================================================

function gen_yyyy_mm_dir() {
  for X in {01..12}; do
    mkdir -p "2017/${X}"
    mkdir -p "2018/${X}"
    mkdir -p "2019/${X}"
    mkdir -p "2020/${X}"
    mkdir -p "2021/${X}"
    mkdir -p "2022/${X}"
  done
}

function move_yyyy_mm() {
  for YYYY in {2017..2021}; do
    for MM in {01..12}; do
      for DD in {01..31}; do
        mv ${YYYY}-${MM}-${DD}.md  ${YYYY}/${MM}/
      done
      cd ${YYYY}/${MM}/
      rename "s/${YYYY}-${MM}-//" *.md
      cd ../..
    done
  done
}

# - main ----------------------------------------------------------------------

gen_yyyy_mm_dir
move_yyyy_mm