syntaxe sh et non bash. Merci @mdk

.scripts/fuzzy_diff

@@ -10,8 +10,8 @@ _usage() {
 }
 
 LAUNCH_EDIT=1
-if [[ $# -eq 2 ]]; then
-    if [[ $1 -eq "-n" ]] || [[ $1 -eq "--no-edit" ]]; then
+if [ $# -eq 2 ]; then
+    if [ "$1" -eq "-n" ] || [ "$1" -eq "--no-edit" ]; then
         LAUNCH_EDIT=0
     else
         _usage
@@ -19,11 +19,11 @@ if [[ $# -eq 2 ]]; then
     shift
 fi
 
-if [[ $# -ne 1 ]]; then
+if [ $# -ne 1 ]; then
     _usage
 fi
 
-if [[ ! -f $1 ]]; then
+if [ ! -f "$1" ]; then
     echo "$1: file not found"
     _usage
 fi
@@ -34,7 +34,13 @@ trap 'rm --force --recursive "${TMP_DIR}"' EXIT
 
 
 PO_EDITOR=poedit
-DIFFTOOL=$(git config diff.tool)
+DIFFTOOL=$(which $(git config diff.tool))
+
+if [ ! -x "$DIFFTOOL" ]; then
+    echo "git diff.tool seems not configured"
+    _usage
+fi
+
 PO_FILE=$1
 
 # search for revs where fuzzy was added or suppressed
@@ -43,7 +49,7 @@ FUZZY_REVS=$(git log --oneline -S '#, fuzzy' ${PO_FILE} | \
              grep -i 'merge' | \
              awk '{ print $1 }')
 
-if [[ ${LAUNCH_EDIT} -eq 1 ]]; then
+if [ ${LAUNCH_EDIT} -eq 1 ]; then
     ${PO_EDITOR} "${PO_FILE}" 2>/dev/null &
 fi