#!/bin/bash

 #-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#
 #                                                                     #
 # Conversor de TXT antigo para MD  -  Pedro T. R. Pinheiro - 22JAN22  #
 # --------- -- --- ------ ---- --  -  ----- -- -- -------- - -------  #
 #                                                                     #
 # Este conversor transforma arquivos de texto puro por mim escritos   #
 # no passado em formato Markdown, para que possam ser corretamente    #
 # arquivados neste repositório. Provavelmente só é útil para mim, mas #
 # seguramente pode ser adaptado a outros usos.                        #
 # --                                                                  #
 # Old TXT to MD converter: converts my old plain text files into the  #
 # Markdown format, so they can correctly archived in this repository. #
 # Probably useful only to me, though it surely can be adapted to suit #
 # the needs of different people.                                      #
 #-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#

author="Pedro T. R. Pinheiro"
file=$1

if [ ! -f $file ]; then
	echo "$file: No such file or directory."
	exit 1
fi

if [ ! -r $file ]; then
	echo "$file: Can't stat."
	exit 2
fi

# Metadata
encoding=`file --mime-encoding ${file} | cut -d" " -f2`
lastMod=`stat -c %y ${file}`
presentDate=`date --rfc-3339=seconds`
title=`cat ${file} | head -1`
titleUnicode=`echo -ne ${title} | iconv -f ${encoding}`

# File contents
content=`cat ${file}` 
contentUnicode=`echo -ne "${content}" | iconv -f ${encoding}`
# Lines can't be longer than 72 (-w 72), nor can 
# words be broken (-s, only breaks on white space)
contentWraped=`echo "${contentUnicode}" | fold -w 72 -s`

yamlHeader=`cat << EOF
---
author:   ${author}
title:    ${titleUnicode}
date:     "${lastMod}"
comment:  "Original file written in ${encoding}, at ${lastMod}. 
          Converted to Markdown at ${presentDate}"
origDate: "${lastMod}"
convDate: "${presentDate}"
---
EOF`

output="${yamlHeader}\n\n${contentWraped}\n"

# Filename
# Not really useful to all people... Strong implies there's 
# a ".txt" suffix to the filename. 
baseName=`basename $file`
destFile=`echo $baseName | sed "s/.txt/.md/g"`

echo -ne "$output" > $destFile