Initial import

This commit is contained in:
Emmanuel BENOîT 2020-10-19 21:05:11 +02:00
commit 4c850d2b48

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#!/usr/bin/perl
# Shiny perl prompt, lol
use strict;
use warnings;
use utf8;
use open ':std', ':encoding(UTF-8)';
use POSIX qw(strftime);
our @LEFT = (
'datetime' ,
'userhost' ,
# 'load' ,
# 'prevcmd' ,
);
our $MIDDLE = 'cwd';
our @RIGHT = (
# 'datetime' ,
# 'userhost' ,
'load' ,
# 'prevcmd' ,
);
our @INPUT = (
# 'datetime' ,
# 'userhost' ,
# 'load' ,
'prevcmd' ,
);
our %CONFIG = (
# LAYOUT
# - Always generate input line ?
layout_input_always => 0 ,
# CURRENT WORKING DIRECTORY
# - Max width as a percentage of the terminal's width
cwd_max_width => 35 ,
# USER@HOST
# - Display username? 0=no, 1=yes
uh_username => 1 ,
# - Display hostname? 0=no, 1=always, 2=remote only
uh_hostname => 2 ,
# - Display symbol for remote hosts ?
uh_remote => 1 ,
# DATE/TIME
# - Display date?
dt_show_date => 0 ,
# - Display time?
dt_show_time => 1 ,
# - Date format
dt_date_fmt => '%Y-%m-%d' ,
# - Time format
dt_time_fmt => '%H:%M' ,
# PREVIOUS COMMAND STATE
# - Display OK/failed symbol?
pcmd_show_symbol => 1 ,
# - Display status code? 0=no, 1=always, 2=on failure
pcmd_show_code => 1 ,
# - Pad status code display? 0 = no, -1 = left aligned, 1 = right aligned
pcmd_pad_code => -1 ,
# Success/failure colors for 0=nothing, 1=symbol, 2=code, 3=both
pcmd_colors => 1 ,
# LOAD AVERAGE
# - Minimal load average before the section is displayed
load_min => 0 ,
);
our %THEME = (
# Padding character
padding => ' ' ,
# Left side of top line
left_prefix => '\b1 ' ,
left_separator => '\f0\b2\f2\b1' ,
left_suffix => '\f0\b2\f2\b1 ' ,
# Middle of top line
middle_prefix => '' ,
middle_separator => ' | ' ,
middle_suffix => '' ,
# Right side of top line
right_prefix => '\f2\b0\f1\b2\b1' ,
right_separator => '\f2\b0\f1\b2' ,
right_suffix => '\b0 ' ,
# Input line
input_prefix => '\b1 ' ,
input_separator => '\f0\b2\f2\b1' ,
input_suffix => ' \f0\b2\f2\b1' ,
# Secondary prompt suffix
ps2_suffix => '\f0\b1 ' ,
# Extra colors for transition strings
transition => [ 233 ] ,
# Default left side background color
bg_left => 239 ,
# Default middle background color
bg_middle => 235 ,
# Default right side background color
bg_right => 239 ,
# Default input prompt background color
bg_input => 238 ,
# Secondary prompt backaground
bg_ps2 => 234 ,
# Current working directory - Truncation string
cwd_trunc => '…' ,
# Current working directory - Foreground / background colors
cwd_fg_color => 15 ,
cwd_bg_color => -1 ,
# User@host - Remote host symbol
uh_remote_symbol => '↥' ,
# User@host - User - Foreground and background colors
uh_user_fg => 15 ,
uh_user_bg => 18 ,
# User@host - Root - Foreground and background colors
uh_root_fg => 0 ,
uh_root_bg => 220 ,
# Date/time - Colors
dt_time_fg => 15 ,
dt_date_fg => 15 ,
dt_bg => -1 ,
# Previous command state - Symbols
pcmd_ok_sym => '✓' ,
pcmd_err_sym => '✗' ,
# Previous command state - OK text / background color
pcmd_ok_fg => 21 ,
pcmd_ok_bg => -1 ,
# Previous command state - Error text / background color
pcmd_err_fg => 220 ,
pcmd_err_bg => -1 ,
# Previous command state - Other text foreground
pcmd_text_fg => 15 ,
# Load average - Symbol or text
load_title => '↟' ,
# Load average - Low load colors
load_low_fg => 15 ,
load_low_bg => -1 ,
# Load average - Medium load colors
load_med_fg => 231 ,
load_med_bg => 135 ,
# Load average - High load colors
load_high_fg => 231 ,
load_high_bg => 130
);
#-------------------------------------------------------------------------------
# MAIN PROGRAM
chop( our $COLUMNS = `tput cols` );
our %TCCACHE = ();
sub tput_sequence
{
my $args = shift;
return $TCCACHE{ $args } if exists $TCCACHE{ $args };
open( my $fh , "tput $args|" );
my $value = <$fh>;
close( $fh );
return ( $TCCACHE{ $args } = "\\[$value\\]" );
}
sub set_color
{
my ( $type , $index ) = @_;
return tput_sequence( "seta$type $index" );
}
sub get_section_length
{
my $section = shift;
my $len = 0;
#use Data::Dumper; print Dumper( $section );
foreach my $item ( @{ $section->{content} } ) {
next if ref $item;
$len += length $item;
}
return $len;
}
sub get_length
{
my $len = 0;
foreach my $section ( @_ ) {
$len += get_section_length( $section );
}
return $len;
}
sub gen_transition
{
my $transition = shift;
my @colors = ( @_ , @{ $THEME{transition} } );
my $state = 0;
my $pc;
my $out = [ ];
foreach my $char ( split // , $transition ) {
if ( $state == 1 ) {
if ( $char eq 'f' || $char eq 'b' ) {
$pc = $char;
$state = 2;
} else {
$state = 0;
push @$out , "\\$char";
}
} elsif ( $state == 2 ) {
$char = '0' unless $char =~ /^\d$/;
push @$out , { $pc . 'g' => $colors[ int($char) ] };
$state = 0;
} elsif ( $char eq '\\' ) {
$state = 1;
} else {
push @$out , $char;
}
}
return { content => $out };
}
sub compute_trans_lengths
{
my %out = ();
foreach my $side ( qw( left right input ) ) {
foreach my $type ( qw( prefix separator suffix ) ) {
my $k = $side . '_' . $type;
$out{ $k } = get_section_length( gen_transition(
$THEME{ $k } , 1 , 2 ) );
}
}
return %out;
}
our %TLEN = compute_trans_lengths;
sub gen_prompt_section
{
no strict 'refs';
my $section = shift;
my $func = 'render_' . $section;
return &$func( );
}
sub gen_prompt_sections
{
my @output = ( );
foreach my $section ( @_ ) {
@output = ( @output , gen_prompt_section( $section ) );
}
return @output;
}
sub adapt_to_width
{
my ( $length , $side , @input ) = @_;
my $minTransLen = $TLEN{ $side . '_prefix' } + $TLEN{ $side . '_suffix' };
my @output = ( );
foreach my $section ( @input ) {
my $slen = get_section_length( $section );
my $rlen = $minTransLen
+ scalar( @output ) * $TLEN{ $side . '_separator' };
last if $$length + $slen + $rlen > $COLUMNS;
push @output , $section;
$$length += $slen;
}
if ( @output ) {
$$length += $minTransLen
+ ( scalar( @output ) - 1 ) * $TLEN{ $side . '_separator' };
}
return @output;
}
sub add_transitions
{
my $name = shift;
my $cBefore = shift;
my $cAfter = shift;
my $prefix = $THEME{$name . '_prefix'};
my $separator = $THEME{$name . '_separator'};
my $suffix = $THEME{$name . '_suffix'};
my $prevBg = undef;
my $curBg = $cBefore;
my @out = ( );
foreach my $section ( @_ ) {
$prevBg = $curBg;
$curBg = ( exists $section->{bg} ) ? $section->{bg} : -1;
my $trans = scalar(@out) ? $separator : $prefix;
@out = ( @out ,
gen_transition( $trans , $prevBg , $curBg ) ,
$section ,
);
}
@out = ( @out , gen_transition( $suffix , $curBg , $cAfter ) ) if @out;
return @out;
}
sub render
{
my $name = shift;
my $out = '';
my $mustSetFg = undef;
my $mustSetBg = undef;
my $cDefault = $THEME{'bg_' . $name};
foreach my $section ( @_ ) {
$mustSetBg = $section->{bg} if exists $section->{bg};
foreach my $part ( @{ $section->{content} } ) {
if ( ref $part ) {
$mustSetBg = $part->{bg} if exists $part->{bg};
$mustSetFg = $part->{fg} if exists $part->{fg};
} else {
if ( defined $mustSetBg ) {
$mustSetBg = $cDefault if $mustSetBg < 0;
$out .= set_color( 'b' , $mustSetBg );
}
if ( defined $mustSetFg ) {
$mustSetFg = $cDefault if $mustSetFg < 0;
$out .= set_color( 'f' , $mustSetFg );
}
$out .= $part;
$mustSetBg = $mustSetFg = undef;
}
}
}
return $out;
}
sub gen_top_line
{
return "" unless ( @LEFT || @RIGHT || defined( $MIDDLE ) );
# Generate content
my ( @left , @lm , @middle , @mr , @right ) = ( );
my $mc = $THEME{bg_middle};
@left = gen_prompt_sections( @LEFT );
if ( defined $MIDDLE ) {
@middle = ( gen_prompt_section( $MIDDLE ) );
if ( @middle ) {
@lm = gen_transition( $THEME{middle_prefix} , $mc , $mc );
@mr = gen_transition( $THEME{middle_suffix} , $mc , $mc );
foreach my $entry ( @middle ) {
delete $entry->{bg};
}
}
}
@right = gen_prompt_sections( reverse @RIGHT );
# Adapt to width
my $len = get_length( ( @lm , @middle , @mr ) );
@left = adapt_to_width( \$len , 'left' , @left );
@right = reverse adapt_to_width( \$len , 'right' , reverse @right );
# Prepare padding
my @mpad = ();
if ( $len < $COLUMNS ) {
push @mpad , {
content => [ $THEME{padding} x ( $COLUMNS - $len ) ]
};
}
# Render
my $txt = render( 'left' , add_transitions( 'left' , 0 , $mc , @left ) );
$txt .= render( 'middle' , @lm , @middle , @mr , @mpad );
$txt .= render( 'right' , add_transitions( 'right' , $mc , 0 , @right ) );
return $txt . "\\n";
}
sub gen_input_line
{
return "" unless @INPUT || $CONFIG{layout_input_always};
my $len = 0;
my @input = adapt_to_width( \$len , 'input' , gen_prompt_sections( @INPUT ) );
push @input , {content=>['']} unless @input;
return render( 'input' , add_transitions( 'input' , 0 , 0 , @input ) );
}
my $ps1 = gen_top_line . gen_input_line;
$ps1 .= tput_sequence( 'sgr0' ) if $ps1;
print "$ps1\n";
#-------------------------------------------------------------------------------
# SECTION RENDERERS
sub render_datetime
{
my @cur_time = localtime time;
my @out = ( );
if ( $CONFIG{dt_show_date} ) {
push @out , {fg=>$THEME{dt_date_fg}};
push @out , ( strftime $CONFIG{dt_date_fmt}, @cur_time )
}
if ( $CONFIG{dt_show_time} ) {
push @out, ' ' if @out;
push @out , {fg=>$THEME{dt_time_fg}};
push @out , ( strftime $CONFIG{dt_time_fmt}, @cur_time )
}
return { bg => $THEME{dt_bg} , content => [@out] };
}
sub render_cwd
{
use Cwd;
my $cwd = getcwd;
( my $dir = $cwd ) =~ s!^.*/!!;
my $max_len = int( $COLUMNS * $CONFIG{cwd_max_width} / 100 );
$max_len = length( $dir ) if length( $dir ) > $max_len;
( $dir = $cwd ) =~ s!^$ENV{HOME}(\z|/.*)$!~$1!;
my $offset = length( $dir ) - $max_len;
if ( $offset > 0 ) {
$dir = substr $dir , $offset , $max_len;
$dir =~ s!^[^/]*/!$THEME{cwd_trunc}/!;
}
return {
bg => $THEME{cwd_bg_color} ,
content => [ {fg=>$THEME{cwd_fg_color}} , $dir ]
};
}
sub render_userhost
{
use Sys::Hostname;
my ( $un , $hn , $rm ) = map {
$CONFIG{"uh_$_"}
} qw( username hostname remote );
return () unless $un || $hn || $rm;
my $is_remote = 0;
if ( $hn == 2 || $CONFIG{uh_remote} ) {
foreach my $ev ( qw( SSH_CLIENT SSH2_CLIENT SSH_TTY ) ) {
if ( exists($ENV{$ev}) && $ENV{$ev} != '' ) {
$is_remote = 1;
last;
}
}
}
my $str = '';
if ( $un ) {
$str .= getlogin || getpwuid( $< ) || '(?)';
}
if ( $hn == 1 || ( $hn == 2 && $is_remote ) ) {
$str .= '@' if $str;
$str .= hostname;
}
if ( $rm && $is_remote ) {
$str .= $THEME{uh_remote_symbol};
}
return () unless $str;
return {
bg => $THEME{ ( $> == 0 ) ? 'uh_root_bg' : 'uh_user_bg' } ,
content => [
{ fg => $THEME{ ( $> == 0 ) ? 'uh_root_fg' : 'uh_user_fg' } } ,
$str
] ,
};
}
sub render_prevcmd
{
my ( $ss , $sc , $pc , $cl ) = map {
$CONFIG{ "pcmd_$_" }
} qw( show_symbol show_code pad_code colors );
my $status = $ARGV[0];
$sc = ( $sc == 1 || ( $sc == 2 && $status ) );
return () unless $sc || $ss;
my $col = ( $status == 0 ) ? $THEME{pcmd_ok_fg} : $THEME{pcmd_err_fg};
my @out = ();
if ( $ss ) {
push @out , { fg => ( $cl & 1 != 0 ) ? $col : -1 };
push @out , ( ( $status == 0 )
? $THEME{pcmd_ok_sym}
: $THEME{pcmd_err_sym} );
}
if ( $sc ) {
push @out , ' ' if @out;
push @out , { fg => ( $cl & 2 != 0 ) ? $col : -1 };
if ( $pc ) {
my $str = sprintf '%' . ( $pc * 3 ) . 's' , $status;
$str =~ s/ /$THEME{padding}/g;
push @out , $str;
} else {
push @out , $status;
}
}
return {
bg => ( $status == 0 ) ? $THEME{pcmd_ok_bg} : $THEME{pcmd_err_bg} ,
content => [ @out ] ,
};
}
sub render_load
{
my $ncpu;
if ( open( my $fh , '</proc/cpuinfo' ) ) {
while ( my $l = <$fh> ) {
$ncpu++ if $l =~ /^[Pp]rocessor/;
}
close $fh;
} else {
$ncpu = 1;
}
my $load;
return () unless open( my $fh , '/proc/loadavg' );
chop( $load = <$fh> );
close $fh;
$load =~ s/ .*$//;
$load = int( $load * 100 / $ncpu );
return () if $load < $CONFIG{load_min};
my $cat;
if ( $load < 34 ) {
$cat = 'low';
} elsif ( $load < 68 ) {
$cat = 'med';
} else {
$cat = 'high';
}
$load = $THEME{load_title} . $load . '%';
return {
bg => $THEME{ 'load_' . $cat . '_bg' } ,
content => [ {fg=>$THEME{ 'load_' . $cat . '_fg' }}, $load ]
};
}