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#!/bin/sh
set -e
target="$1"
link="$2"
if ! test $# = 2; then
printf 'usage: %s target link\n' "$0" >&2
exit 1
fi
if ! test -d scalable || ! test -r icons.mk; then
printf 'could not find both scalable/ and icons.mk the current working directory\n' >&2
exit 1
fi
T="$target"
L="$link"
while test $(printf '%s\n' "$T" "$L" | grep / | wc -l) = 2; do
Td="$(printf '%s\n' "$T" | cut -d / -f 1)"
Ld="$(printf '%s\n' "$L" | cut -d / -f 1)"
if test ! "$Td" = "$Ld"; then
break
fi
T="$(printf '%s\n' "$T" | cut -d / -f 2-)"
L="$(printf '%s\n' "$L" | cut -d / -f 2-)"
done
while printf '%s\n' "$L" | grep / > /dev/null; do
T="$(printf '../%s\n' "$T")"
L="$(printf '%s\n' "$L" | cut -d / -f 2-)"
done
expectedtarget="${T}.svg"
if test -f "scalable/${link}.svg"; then
if test ! -L "scalable/${link}.svg"; then
currenttarget="not a symbolic link"
elif test "$(readlink "scalable/${link}.svg")" = "$expectedtarget"; then
currenttarget="links to $target"
else
currenttarget="symbolic link -> $target"
fi
printf '%s already exists (%s)\n' "scalable/${link}.svg" "$currenttarget" >&2
exit 1
fi
targetentry="$(grep '^[[:space:]]*'"$target"'\\$' < icons.mk)"
test -n "$targetentry"
test $(printf '%s\n' "$targetentry" | wc -l) = 1
if grep '^[[:space:]]*'"$link"'\\$' < icons.mk > /dev/null; then
printf '%s is already listed in icons.mk, however its file does not exist\n' "$link" >&2
exit 1
fi
indent="$(sed -n 's:^\([[:space:]]*\)'"$target"'\\$:\1:p' < icons.mk)"
targetentrysed="$(printf '^%s$\n' "$targetentry" | sed 's:[/\\]:\\&:g')"
newiconsfile="$(sed /"$targetentrysed"/q < icons.mk && \
printf '%s\t%s\\\n' "$indent" "$link" && \
sed 1,/"$targetentrysed"/d < icons.mk)"
test $(printf '%s\n' "$newiconsfile" | diff icons.mk - | wc -l) = 2
( ! printf '%s\n' "$newiconsfile" | diff -U1 icons.mk - >&2 )
T="$target"
L="$link"
while test $(printf '%s\n' "$T" "$L" | grep / | wc -l) = 2; do
Td="$(printf '%s\n' "$T" | cut -d / -f 1)"
Ld="$(printf '%s\n' "$L" | cut -d / -f 1)"
if test ! "$Td" = "$Ld"; then
break
fi
T="$(printf '%s\n' "$T" | cut -d / -f 2-)"
L="$(printf '%s\n' "$L" | cut -d / -f 2-)"
done
while printf '%s\n' "$L" | grep / > /dev/null; do
T="$(printf '../%s\n' "$T")"
L="$(printf '%s\n' "$L" | cut -d / -f 2-)"
done
target="$expectedtarget"
link="scalable/${link}.svg"
printf 'ln -s %s %s\n' "$target" "$link" >&2
if ! cp icons.mk icons.mk~; then
printf 'failed to create backup of icons.mk\n' >&2
exit 1
fi
if ! ln -s "$target" "$link"; then
printf 'failed to create symbolic link %s -> %s\n' "$link" "$target" >&2
rm -f icons.mk~ >&2
exit 1
fi
if ! printf '%s\n' "$newiconsfile" > icons.mk; then
printf 'failed to insert entry into icons.mk\n' >&2
if ! unlink "$link" >&2; then
printf '\x1b[31mfailed to remove created symbolic link (%s)\x1b[m\n' "$link" >&2
fi
if ! mv icons.mk~ icons.mk >&2; then
printf '\x1b[1;31mfailed to restore icons.mk using icons.mk~\x1b[m\n' >&2
fi
exit 1
fi
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