Use meld tool with cmd line svn diff

svn.sh

##### svn command to modify externals with gui at the base directory #####
svn propedit svn:externals .

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

##### command to use meld for svn diff #####
svn -diff --diff-cmd='meld' [filepath] -r [revision]

##### alternatively modify the ~/.subversion/config file to point to the scripts below to use the regular command #####

##### script for setting svn diff program #####

#!/bin/sh
# Configure your favorite diff program here.
DIFF="/usr/bin/meld" 
# Subversion provides the paths we need as the sixth and seventh
# parameters.
LEFT="$6"
RIGHT="$7"
# Call the diff command (change the following line to make sense for
# your merge program).
"$DIFF" "$LEFT" "$RIGHT"

# Return an errorcode of 0 if no differences were detected, 1 if some were.
# Any other errorcode will be treated as fatal.



##### script for setting svn merge program #####

#!/bin/bash

base=${1?1st argument is 'base' file}
theirs=${2?2nd argument is 'theirs' file}
mine=${3?3rd argument is 'mine' file}
merged=${4?4th argument is 'merged' file}
version=$(meld --version | perl -pe '($_)=/([0-9]+([.][0-9]+)+)/' )    

if [[ "$version" < 1.7 ]]
then
  #old meld version 1.6.* = three input files
  cat "$mine" > "$merged"
  meld --label="Base=${base##*/}"           "$base"   \
       --label="Mine->Merged=${merged##*/}" "$merged" \
       --label="Theirs=${theirs##*/}"       "$theirs"
else
  # recent meld versions 1.7.* and above = four input files
  meld --label="Base=${base##*/}"           "$base"   \
       --label="Mine=${mine##*/}"           "$mine"   \
       --label="Merged=${merged##*/}"       "$merged" \
       --label="Theirs=${theirs##*/}"       "$theirs"
fi