Laravel用だけどPythonです。
Laravel5.8, Python3.7.4 で動作確認済み。Python２系だと文字化けするかも。

用意

in: database.md
- DB情報をmarkdown形式で書く
out: migrations/
- フォルダを作っておく

作成例)

database.md

## users
- ユーザ情報

| 名前            | データ型     | 照合順序           | 属性     | NULL | デフォルト値 | コメント | その他 |
|-----------------|--------------|--------------------|----------|------|--------------|----------|--------|
| id              | bigint(20)   |                    | UNSIGNED | no   | なし         | ID       | AUTO_INCREMENT |
| email           | varchar(255) | utf8mb4_unicode_ci |          | no   | なし         | メールアドレス | UNIQUE |
| name            | varchar(63)  | utf8mb4_unicode_ci |          | no   | なし         | 名前     |
| password        | varchar(255) | utf8mb4_unicode_ci |          | no   | なし         | ログインパスワード(暗号化) |
| last_logined_at | timestamp    |                    |          | yes  | NULL         | 最終ログイン日時 |
| remember_token  | varchar(100) | utf8mb4_unicode_ci |          | yes  | NULL         | パスワード再発行トークン |
| created_at      | timestamp    |                    |          | yes  | NULL         | 作成日   |
| updated_at      | timestamp    |                    |          | yes  | NULL         | 更新日   |
| deleted_at      | timestamp    |                    |          | yes  | NULL         | 削除日   |

テーブル名は見出しh２, スネークケース (## xxx_xxx)
カラム情報のヘッダは名前, データ型, 照合順序, 属性, NULL, デフォルト値, コメント, その他の順

変換スクリプト

$ python md2migrations.py

md2migrations.py

# coding: utf-8
import re

inFile = 'database.md'
outFolder = 'migrations/'

class Color:
    BLACK     = '\033[30m'
    RED       = '\033[31m'
    GREEN     = '\033[32m'
    YELLOW    = '\033[33m'
    BLUE      = '\033[34m'
    PURPLE    = '\033[35m'
    CYAN      = '\033[36m'
    WHITE     = '\033[37m'
    END       = '\033[0m'
    BOLD      = '\038[1m'
    UNDERLINE = '\033[4m'
    INVISIBLE = '\033[08m'
    REVERCE   = '\033[07m'

class Migrate():

    def __init__(self, tableLine):
        self.tableName = tableLine.replace('##', '').replace(' ', '').replace('\n', '')
        print('reading ' + self.tableName + '...')

        n = self.tableName.find('_')
        if n < 0:
            self.className = self.tableName[0].upper() + self.tableName[1:]
        else:
            self.className = self.tableName[0].upper() + self.tableName[1:n] + self.tableName[n + 1].upper() + self.tableName[n + 2:]

        self.code = """
<?php

use Illuminate\\Support\\Facades\\Schema;
use Illuminate\\Database\\Schema\\Blueprint;
use Illuminate\\Database\\Migrations\\Migration;

class Create""" + self.className + """Table extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('""" + self.tableName + """', function (Blueprint $table) {
"""

    def put(self, line):
        line = line.replace('\n', '')
        allItems = line.split('|')
        items = {}
        items['field'] = allItems[1].replace(' ', '')
        items['type'] = allItems[2].replace(' ', '')
        items['attribute'] = allItems[4].replace(' ', '')
        items['null'] = allItems[5].replace(' ', '')
        items['default'] = allItems[6].replace(' ', '')
        items['comment'] = re.sub('^ *| *$', '', allItems[7])
        items['extra'] = allItems[8].replace(' ', '')

        # ヘッダフィールドをスキップ
        if items['field'] == u'名前':
            return

        # 定型フィールド
        if items['field'] == 'id':
            self.code += "            $table->bigIncrements('id')->comment('" + items['comment'] + "');\n"
            return
        if items['field'] == 'remember_token':
            self.code += "            $table->rememberToken();\n"
            return
        if items['field'] == 'created_at':
            self.code += "            $table->timestamps();\n"
            return
        if items['field'] == 'updated_at':
            return
        if items['field'] == 'deleted_at':
            self.code += "            $table->softDeletes();\n"
            return

        # 定形外フィールド
        self.code += '            $table->'
        # データ型・属性
        if items['type'] == 'datetime':
            self.code += "dateTime('" + items['field'] + "')"
        elif items['type'] == 'timestamp':
            self.code += "timestamp('" + items['field'] + "')"
        elif re.match('bigint', items['type']):
            if re.match('UNSIGNED', items['type']):
                self.code += "unsignedBigInteger('" + items['field'] + "')"
            else:
                self.code += "bigInteger('" + items['field'] + "')"
        elif re.match('tinyint', items['type']):
            if re.match('UNSIGNED', items['type']):
                self.code += "unsignedTinyInteger('" + items['field'] + "')"
            else:
                self.code += "tinyInteger('" + items['field'] + "')"
        elif re.match('varchar', items['type']):
            strLen = re.sub('\\D', '', items['type'])
            self.code += "string('" + items['field'] + "', " + strLen + ")"
        elif items['type'] == 'boolean':
            self.code += "boolean('" + items['field'] + "')"            
        else:
            print(Color.RED + 'ERROR! ' + items['type'] + ' is not compatible!' + Color.END)

        # NULL
        if items['null'] == 'yes':
            self.code += '->nullable()'

        # デフォルト値
        if items['default'] != 'なし':
            self.code += "->default(" + items['default'] + ")"

        # コメント
        if items['comment'] != '':
            self.code += "->comment('" + items['comment'] + "')"

        # その他
        if re.match('UNIQUE', items['extra']):
            self.code += '->unique()'

        self.code += ';\n'

    def write(self):
        self.code += """        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('""" + self.tableName + """');
    }
}
"""
        if self.code.find('$table->') > 0:
            outFile = outFolder + '2019_11_15_000000_create_' + self.tableName + '_table.php'
            with open(outFile, mode='w') as f:
                f.write(self.code)
            print(Color.CYAN + 'wrote to ' + outFile + Color.END)


def main():
    migrate = None
    with open(inFile) as f:
        for line in f:
            if re.match('^## ', line):
                if migrate:
                    migrate.write()
                migrate = Migrate(line)
                continue

            if re.match('^\| ', line):
                migrate.put(line)

    if migrate:
        migrate.write()

    print(Color.GREEN + 'complate' + Color.END)

if __name__ == '__main__':
    main()

出力

reading users...
wrote to migrations/2019_11_15_000000_create_users_table.php
complate

migrations/2019_11_15_000000_create_users_table.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateUsersTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->bigIncrements('id')->comment('ID');
            $table->string('email', 255)->comment('メールアドレス')->unique();
            $table->string('name', 63)->comment('名前');
            $table->string('password', 255)->comment('ログインパスワード(暗号化)');
            $table->timestamp('last_logined_at')->nullable()->default(NULL)->comment('最終ログイン日時');
            $table->rememberToken();
            $table->timestamps();
            $table->softDeletes();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('users');
    }
}

日時は2019_11_15_000000で固定です
使いやすいように適当に直して使ってください