A tool to substract a constant from bar numbers in LP code

[Jacques Menu]

Hello folks,

When scanning scores, I often end up with several movements in a single MusicXML file, with bar numbered sequentially, i.e. not restarting at 1 for each movement.

In order to help having correct bars numbers, quite needed when proof-reading/compiling the code, I use the following bash/awk script.

Hope this helps!

—

jmenu@castor:~/bin > cat too.txt 

  e8 [ f8 e8 ] | % 29

  f8 [ g8 g,8 ] | \barNumberCheck #30

jmenu@castor:~/bin > ./SubstractNFromLPEndOfLineBarNumbers 24 < too.txt

  e8 [ f8 e8 ] | % 5

  f8 [ g8 g,8 ] | \barNumberCheck # 6

—

jmenu@castor:~/bin > cat SubstractNFromLPEndOfLineBarNumbers

#!/bin/bash

# Jacques Menu - 05/06/2014

# Use awk twice in a pipe to handle "% nnn"  and "\barnumber nnn" specs

# as may occur in Lilypond code obtained from MusicXML with music2xml

# if several scores were scanned at once.

# Input comes from a file, and output goes to the standard output,

# making it available to copy and paste somewhere.

# The pattern specified for \barNumberCheck is special

# because awk on Mac OS X is not gawk (and older)

# The comparison between barNumber and delta is useful

# in case some number have already been adjusted by hand,

# otherwise negative bar numbers would be obtained

# Tested on Mac OS X 10.9.3 and RedHat 6.5

# "-------------------------------------------------------------------------"

# "--> Check usage and arguments"

# "-------------------------------------------------------------------------"

USAGE="--> Usage: $0 deltaInBarNumbers"

if [ $# -ne 1 ]; then

    echo ""

    echo ${USAGE}

    echo

    exit

fi

DELTA=$1

# "-------------------------------------------------------------------------"

# "--> Go for it"

# "-------------------------------------------------------------------------"

awk -F '%' -v delta=${DELTA} \

   ' \

   $2 ~ "[ ]*[0-9]+[ ]*" { \

      barNumber = int($2); \

      if (barNumber > delta) \

         printf ("%s%% %d\n", $1, barNumber - delta); \

      else \

         printf ("%s\n", $0); \

      } \

   $2 !~ "[ ]*[0-9]+[ ]*" { \

      printf ("%s\n", $0); \

   }' \

| \

awk -F 'barNumberCheck #' -v delta=${DELTA} \

   ' \

   $2 ~ "[ ]*[0-9]+[ ]*" { \

#      printf ("--> $1 = %s\n", $1); \

#      printf ("--> $2 = %s\n", $2); \

      barNumber = int($2); \

#      printf ("--> barNumber = %d\n", barNumber); \

      if (barNumber > delta) \

         printf ("%sbarNumberCheck # %d\n", $1, barNumber - delta); \

      else \

         printf ("%s\n", $0); \

      } \

   $2 !~ "[ ]*[0-9]+[ ]*" { \

      printf ("%s\n", $0); \

      }'