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maxlen.bash: suppress progress output if not on a terminal

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This commit is contained in:
Jakob Unterwurzacher 2021-06-25 14:00:20 +02:00
parent 84e702126a
commit 389aba6a6b
1 changed files with 19 additions and 5 deletions
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24
contrib/maxlen.bash
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@ -13,6 +13,13 @@ if [[ $# -ne 1 || $1 == -* ]]; then
exit 1
fi
# Only show live progress if connected to a termial
# https://stackoverflow.com/a/911213/1380267
INTERACTIVE=0
if [[ -t 1 ]] ; then
INTERACTIVE=1
fi
cd "$1"
echo "Testing $PWD"
@ -22,7 +29,7 @@ NAME=""
while true ; do
NEXT="${NAME}x"
if [[ -e $NEXT ]]; then
echo "error: file $NEXT already exists"
echo "error: file $PWD/$NEXT already exists"
exit 1
fi
touch $NEXT 2> /dev/null || break
@ -44,7 +51,10 @@ MAX_DIRNAME=${#NAME}
echo "${#NAME}"
for CHARS_PER_SUBDIR in 1 10 100 $MAX_DIRNAME ; do
echo -n " Maximum path length with $(printf %3d $CHARS_PER_SUBDIR) chars per subdir: "
echo -n " Maximum path length with $(printf %3d $CHARS_PER_SUBDIR) chars per subdir: "
if [[ $INTERACTIVE -eq 1 ]] ; then
echo -n " "
fi
# Trick from https://stackoverflow.com/a/5349842/1380267
SUBDIR=$(printf 'x%.0s' $(seq 1 $CHARS_PER_SUBDIR))
mkdir "$SUBDIR"
@ -54,8 +64,10 @@ for CHARS_PER_SUBDIR in 1 10 100 $MAX_DIRNAME ; do
NEXT="$P/$SUBDIR"
mkdir "$NEXT" 2> /dev/null || break
P=$NEXT
echo -n -e "\b\b\b\b"
printf %4d ${#P}
if [[ $INTERACTIVE -eq 1 ]] ; then
echo -n -e "\b\b\b\b"
printf %4d ${#P}
fi
done
# Then add one character at a time until we hit an error
NAME=""
@ -67,7 +79,9 @@ for CHARS_PER_SUBDIR in 1 10 100 $MAX_DIRNAME ; do
if [[ $NAME != "" ]] ; then
P=$P/$NAME
fi
echo -n -e "\b\b\b\b"
if [[ $INTERACTIVE -eq 1 ]] ; then
echo -n -e "\b\b\b\b"
fi
printf %4d ${#P}
echo
rm -R "$SUBDIR"