genstatic.sh

#!/bin/bash

RESOURCE_PREFIX="staticfile_"
LOOKUP_FUNCTION_NAME="lookup_file"
DATATABLENAME="datatable"
XXD="/usr/bin/xxd"
INPUT_DIR=$1
OUTPUT_FILE=$2



###################

incfile=$(basename $2)
tempdir=$(mktemp -d --suffix=genstatic.sh)
tempinc=$tempdir/$incfile
touch $tempdir/$incfile

# c template
cat << 'EOF' > $tempinc
/*
 * Embedded static files
 * generated: #!gendate
 *
 * This File is autogenerated, do not edit manually
 */
#include "Arduino.h"

int #!lookupfn(const char *name){
  typedef struct item_t { const char *name; int id; } item_t;
  item_t table[] = {
#!lookuptable    { 0, 0 }
  };
  for (item_t *p = table; p->name != 0; ++p) {
      if (strcmp(p->name, name) == 0) {
          return p->id;
      }
  }
  return 0;
}

EOF



IFS=$'\n' files=($( find $INPUT_DIR -not -empty -type f | sed "s:^$INPUT_DIR/::" ))
flength=${#files[@]}


lookuptable=""
datatable=""
resid=1
totalsize=0
for (( i=0; i<${flength}; i++ )); do
  
  IFS=$'\n' file="${files[$i]}"
  realfile=$INPUT_DIR/$file
  resvar=$RESOURCE_PREFIX$resid
  tempfile=$tempdir/$resvar
  echo "$resid: $file"

  fileinfo=$(file $realfile | sed "s:^$INPUT_DIR/::")
  fileinfo_short=${fileinfo:0:80}
  filesize=$(ls -lh $realfile | awk '{print $5}')
  echo "/* $fileinfo_short" > $tempfile
  echo " * Size: $filesize */" >> $tempfile
  $XXD -i $realfile >> $tempfile
  xddresname=$( cat $tempfile | head -n3 | tail -n1 | awk '{print $3}' | sed 's:\[\]$::g')
  xddressize=$( cat $tempfile | tail -n1 | awk '{print $5}' | sed 's:;::g' )
  sed -i "s:$xddresname:$resvar:g" $tempfile
  sed -i "s:$resvar\[\]:$resvar\[$xddressize\]:g" $tempfile
  sed -i "s:unsigned char:PROGMEM prog_uchar:g" $tempfile
  echo -e "\n" >> $tempfile
  cat $tempfile >> $tempinc

  lookupentry="    { \"$file\", $resid },\n"
  lookuptable=$lookuptable$lookupentry
  dataentry="  $resvar,\n"
  datatable=$datatable$dataentry
  let resid=resid+1
  let totalsize=$totalsize+$xddressize
done


sed -i "s|#!lookupfn|$LOOKUP_FUNCTION_NAME|g" $tempinc
sed -i "s|#!lookuptable|$lookuptable|g" $tempinc
sed -i "s|#!datatable|$datatable|g" $tempinc
sed -i "s|#!gendate|$(date) on $(hostname)|g" $tempinc


echo "PROGMEM const char *$DATATABLENAME[] = {" >> $tempinc
echo -e $datatable >> $tempinc
echo "};" >> $tempinc


mv $tempinc $OUTPUT_FILE
rm -r $tempdir

echo "Total using $totalsize bytes"