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#!/usr/bin/awk -f
BEGIN {
isatty = system("test -t 1") == "0"
retcode = 0
}
function color(code, s) {
if (isatty) {
return "\033[" code "m" s "\033[0m"
}
return s
}
function red(s) { return color("31", s) }
function green(s) { return color("32", s) }
function magenta(s) { return color("35", s) }
function cyan(s) { return color("36", s) }
function bg_red(s) { return color("41", s) }
function hl_ws(s, pattern) {
gsub(pattern, bg_red("&"), s)
# convert tab characters to 8 spaces to allow coloring
gsub(/\t/, " ", s)
return s
}
/ +\t+/ {
retcode = 1
print magenta(FILENAME) cyan(":") green(FNR) cyan(":") \
hl_ws($0, " +\\t+") red("<-- space(s) followed by tab(s)")
}
/[ \t]+$/ {
retcode = 1
print magenta(FILENAME) cyan(":") green(FNR) cyan(":") \
hl_ws($0, "[ \\t]+$") red("<-- trailing whitespace")
}
ENDFILE {
# will only match on GNU awk, ignored on non-GNU versions
if ($0 ~ /^[ \t]*$/) {
retcode = 1
print magenta(FILENAME) cyan(": ") red("trailing new line(s)")
} else if (RT != "\n") {
retcode = 1
print magenta(FILENAME) cyan(": ") red("no new line at end of file")
}
}
END {
exit retcode
}
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