Split File into Largest Even Multiple Given Number of Records

I need help with a task. Details below. Given file A with x number of records, split the file into y number of smaller files containing equal number of records. Notes: Records are can only be identified by the line starting with "GROUP" ALL text is surrounded by quotes ("") All text is delimited by semicolon (;) All text ends in a new line All files end in a newline All quotes and delimiters must remain intact. Just splitting the file as is, no other changes. Keeping order. File may contain any number of records - primarily used for files with >10k records Records lengths vary by number of (new)lines All files will not have the same order of body text between records and may end with different text; the only marker of a new record is a line beginning with "GROUP" [login to view URL] holds the sample text. It holds 20050 'records' (Lines that start with group - all text after until the next 'Group' is part of the same 'record') The primary issue I was having with this project was identifying blocks of records in order to manipulate them (see line 234-238 in [login to view URL] - tried to use a 'pointer', really want to use a map function?). My work so far is in [login to view URL] located at [login to view URL] This is just to show my thought process. Can discuss at end of project. Input: path to file Output: N number of files each with y number of records Deliverables Rnotebook that splits a file with contents following the structure outlined above Preferably solved with a Tidy solution or Base R solution Please include comments throughout code Suggestions on next steps to make distributable Next steps for me are to make into a shiny app and host on AWS or Azure for users to select their file and receive split files in return Opportunity for ongoing codementor help EXAMPLE: [login to view URL] holds 20050 records. I add the path to the sample text in the R script or Notebook. I enter the number of resulting files I want. The script determines how many records should approximately be in each file, some left over in the last file is okay. If I enter 5 for the number of output files I want, the script should return 5 files, each with 4010 records. If I enter 6 for the number of output files, the script should return 5 files with 3340 records and the 6th would hold the remainder. Summary and 'pseudocode' Count number of records Identify records Find the number of records (y) that would split closest to evenly to result in user defined number of output files with y records in each For line in notice_line: For the number of lines in notice_line If a line starts with "Group", Create an empty file Name the empty file File_n , n for line number in notice_line Put the line in the empty record If the line is not group Add the line to the existing file Until the file has the number of records that would make all resulting files have approximately y number of records, where y is the number of resulting files the user would like to have outputted Deliverables Deliverables Rnotebook that splits a file with contents following the structure outlined above Preferably solved with a Tidy solution or Base R solution Please include comments throughout code Suggestions on next steps to make distributable