convert

#!/usr/bin/env zsh
#
runname=`basename $0`

case $runname in
    ebook)
        # docx to md
        d2m () {
            pandoc -f docx -t markdown --extract-media=$1 -o $1.md $1.docx
        }

        # md to docx
        m2d () {
            pandoc $1.md -o $1.docx
        }

        # md to pdf
        m2p () {
            pandoc --pdf-engine=xelatex \
                   --toc -N \
                   -V colorlinks -V urlcolor=NavyBlue \
                   --highlight-style zenburn \
                   $1.md -o $1.pdf
        }

        # md to epub
        m2e () {
            pandoc -s --toc --toc-depth=2 $1.md -o $1.epub
        }

        # png to pdf
        p2p () {
            sips -s format pdf $1.png --out $1.pdf
        }
        
        ;;
    w2m)
        eval "$(rbenv init -)"
        
        export PATH="/opt/homebrew/lib/ruby/gems/3.0.0/bin:/opt/homebrew/opt/ruby/bin:$PATH"
        export LDFLAGS="-L/opt/homebrew/opt/ruby/lib"
        export CPPFLAGS="-I/opt/homebrew/opt/ruby/include"
        export PKG_CONFIG_PATH="/opt/homebrew/opt/ruby/lib/pkgconfig"
        ;;
    ocr)
        source ~/Init/abrew
        ;;
    *)
        ;;
esac

pdfocr () {
    name=$1
    
    # Split and convert the PDF with ImageMagick convert
    convert -density 300 $name.pdf -type Grayscale -compress lzw -background white +matte -depth 32 page_%05d.tif

    # OCR the pages with Tesseract
    for i in page_*.tif; do echo $i; tesseract $i $(basename $i .tif) pdf; done

    # Join your individual PDF files into a single, searchable PDF with pdftk
    pdftk page_*.pdf cat output ${name}_merged.pdf
}

ocrpdf () {
    source ~/Init/abrew
    
    while test "x$1" != "x"; do
	    case $1 in
	        -l) shift; lang=$1      ;;
	        -i) shift; inpu=$1      ;;
	        -o) shift; oupt=$1      ;;
	        -f) shift; ofmt=$1      ;;
	        *)                      ;;
	    esac
	    shift
    done

    if [[ $lang == ""   ]]; then lang=eng+chi_sim;  fi
    if [[ $inpu == ""   ]]; then inpu=input;        fi
    if [[ $oupt == ""   ]]; then oupt=${inpu}_o;    fi
    if [[ $ofmt == ""   ]]; then ofmt=pdf;          fi

    ocrmypdf -l $lang --output-type $ofmt $inpu.pdf $oupt.pdf
}

ocrpng () {
    sips -s format pdf $1.png --out $1.pdf
    ocrpdf -i $1
}

ocr () {
    name=(`get_suffix $1`)
    prefix=${name[1]}
    suffix=${name[2]}

    case $suffix in
        pdf)
            ocrpdf $prefix
            ;;
        png)
            ocrpng $prefix
            ;;
    esac
}