From ea4599f110cbf1c347535ac1add4299bb8a5e13e Mon Sep 17 00:00:00 2001
From: Mischa POSLAWSKY <perl@shiar.org>
Date: Thu, 5 Sep 2019 23:46:21 +0200
Subject: [PATCH] calculate length percentages of width

Shorthand to facilitate relative sizes without manual preparation.
Allow strings so trailing % can be accepted.
---
 graph | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/graph b/graph
index 307c9e4..0e07a6e 100755
--- a/graph
+++ b/graph
@@ -13,10 +13,19 @@ sub podexit {
 	require Pod::Usage;
 	Pod::Usage::pod2usage(-exitval => 0, -perldocopt => '-oman', @_);
 }
-GetOptions(\my %opt,
+my %opt;
+GetOptions(\%opt,
 	'color|c!',
 	'follow|f:i',
-	'trim|length|l=i',
+	'trim|length|l=s' => sub {
+		my ($optname, $optval) = @_;
+		$optval =~ s/%$// and $opt{trimpct}++;
+		$optval =~ m/^-?[0-9]+$/ or die(
+			"Value \"$optval\" invalid for option $optname",
+			" (number or percentage expected)\n"
+		);
+		$opt{trim} = $optval;
+	},
 	'markers|m=s',
 	'unmodified|u!',
 	'width|w=i',
@@ -26,6 +35,7 @@ GetOptions(\my %opt,
 
 $opt{width} ||= $ENV{COLUMNS} || 80;
 $opt{color} //= -t *STDOUT;  # enable on tty
+$opt{trim}   *= $opt{width} / 100 if $opt{trimpct};
 
 if (defined $opt{follow}) {
 	$opt{follow} ||= 1;
@@ -143,7 +153,7 @@ disabled otherwise such as when piped or redirected.
 
 Interval to output partial progress.
 
-=item -l, --length=[-]<size>
+=item -l, --length=[-]<size>[%]
 
 Trim line contents (between number and bars)
 to a maximum number of characters.
-- 
2.30.0