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# Copyright (c) 2021 Teddy Wing
#
# This file is part of Incdec.
#
# Incdec is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Incdec is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Incdec. If not, see <https://www.gnu.org/licenses/>.
# Version: 0.0.1
# Increment or decrement a number on the current line.
function __readline_incdec {
local increment_by="$1"
local backward="$2"
line=$(perl -s -e '
sub incdec {
my ($line, $increment_by, $point_position, $is_backward) = @_;
$point_position ||= 0;
$is_backward ||= 0;
my $start_position = 0;
my $previous_match_start = 0;
while ($line =~ /(-?\d+)/g) {
if ($is_backward) {
# Set start position to the current match start. This gives us the
# correct start position when incrementing the last number in a
# line.
$start_position = $-[0];
# If point is not at the end, set start position to the number
# closest to the point position.
if ($point_position < $-[0]) {
$start_position = $previous_match_start;
last;
}
$previous_match_start = $-[0];
}
else {
if ($point_position < $+[0]) {
$start_position = $-[0];
last;
}
}
}
# Using `\G` when `pos` is 0 seems to cause occasional missed substitutions.
if ($start_position > 0) {
pos($line) = $start_position;
$line =~ s/\G(-?\d+)/$1 + $increment_by/e;
}
else {
$line =~ s/(-?\d+)/$1 + $increment_by/e;
}
return ($line, $start_position);
}
my ($output, $start_position) = incdec(
$line,
$increment_by,
$point_position,
$backward
);
print $output;
' \
-- \
-line="$READLINE_LINE" \
-increment_by="$increment_by" \
-point_position="$READLINE_POINT" \
-backward="$backward"
)
READLINE_LINE="$line"
}
# Increment the nearest number to the left of point by 1.
function __readline_incdec_increment {
local old_line_length="${#READLINE_LINE}"
__readline_incdec 1 1
local new_line_length="${#READLINE_LINE}"
# If a negative sign was removed, keep point where it was.
if [ "$old_line_length" -gt "$new_line_length" ]; then
READLINE_POINT="$(($READLINE_POINT - 1))"
fi
}
# Decrement the nearest number to the left of point by 1.
function __readline_incdec_decrement {
local old_line_length="${#READLINE_LINE}"
__readline_incdec -1 1
local new_line_length="${#READLINE_LINE}"
# If a negative sign was added, keep point where it was.
if [ "$old_line_length" -lt "$new_line_length" ]; then
READLINE_POINT="$(($READLINE_POINT + 1))"
fi
}
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