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#!/usr/bin/awk -E
# Copyright 2017 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Usage: bitrule [number_of_characters_to_ignore_at_start
function usage() {
print "usage: bitrule [n_chars_to_ignore_at_line_start]" >"/dev/stderr"
exiting=1; exit
}
function repeat(s, n, r, i) {
for (i = 0; i < n; ++i)
r = r " "
return r
}
BEGIN {
ignore_leading = "none"
if (ARGC > 2)
usage()
else if (ARGC == 2) {
ignore_leading = ARGV[1]
delete ARGV[1] # don't treat it as a file
if (ignore_leading < 0)
usage()
}
}
# Track the maximum length of the lines.
length($0) > max_length { max_length = length($0) }
# Detect lines beginning in '0b', '0x' or '0o'. These are binary representations
# of numbers and shouldn't have the rule extend through their prefix.
/^0[box].*/ { is_prefixed = 1 }
{ print }
END {
if (exiting)
exit exiting
top = max_length - 1
if (ignore_leading != "none") {
prefix = repeat(" ", ignore_leading)
top -= ignore_leading
} else if (is_prefixed) {
prefix = " "
top -= 2
}
# Print the ruler.
printf(prefix)
for (i = top; i >= 0; --i)
printf(i % 4 ? "'" : "|")
printf("\n")
# Print the numbers.
printf("%s%s", prefix, repeat("x", top % 4))
for (i = int(top / 4) * 4; i >= 0; i -= 4)
printf("%-4d", i)
printf("\n")
}
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