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pfetch
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#!/bin/sh
#
# pfetch - Simple POSIX sh fetch script.
# Wrapper around all escape sequences used by pfetch to allow for
# greater control over which sequences are used (if any at all).
esc() {
case $1 in
CUU) e="${esc_c}[${2}A" ;; # cursor up
CUD) e="${esc_c}[${2}B" ;; # cursor down
CUF) e="${esc_c}[${2}C" ;; # cursor right
CUB) e="${esc_c}[${2}D" ;; # cursor left
# text formatting
SGR)
case ${PF_COLOR:=1} in
(1)
e="${esc_c}[${2}m"
;;
(0)
# colors disabled
e=
;;
esac
;;
# line wrap
DECAWM)
case $TERM in
(dumb | minix | cons25)
# not supported
e=
;;
(*)
e="${esc_c}[?7${2}"
;;
esac
;;
esac
}
# Print a sequence to the terminal.
esc_p() {
esc "$@"
printf '%s' "$e"
}
# This is just a simple wrapper around 'command -v' to avoid
# spamming '>/dev/null' throughout this function. This also guards
# against aliases and functions.
has() {
_cmd=$(command -v "$1") 2>/dev/null || return 1
[ -x "$_cmd" ] || return 1
}
log() {
# The 'log()' function handles the printing of information.
# In 'pfetch' (and 'neofetch'!) the printing of the ascii art and info
# happen independently of each other.
#
# The size of the ascii art is stored and the ascii is printed first.
# Once the ascii is printed, the cursor is located right below the art
# (See marker $[1]).
#
# Using the stored ascii size, the cursor is then moved to marker $[2].
# This is simply a cursor up escape sequence using the "height" of the
# ascii art.
#
# 'log()' then moves the cursor to the right the "width" of the ascii art
# with an additional amount of padding to add a gap between the art and
# the information (See marker $[3]).
#
# When 'log()' has executed, the cursor is then located at marker $[4].
# When 'log()' is run a second time, the next line of information is
# printed, moving the cursor to marker $[5].
#
# Markers $[4] and $[5] repeat all the way down through the ascii art
# until there is no more information left to print.
#
# Every time 'log()' is called the script keeps track of how many lines
# were printed. When printing is complete the cursor is then manually
# placed below the information and the art according to the "heights"
# of both.
#
# The math is simple: move cursor down $((ascii_height - info_height)).
# If the aim is to move the cursor from marker $[5] to marker $[6],
# plus the ascii height is 8 while the info height is 2 it'd be a move
# of 6 lines downwards.
#
# However, if the information printed is "taller" (takes up more lines)
# than the ascii art, the cursor isn't moved at all!
#
# Once the cursor is at marker $[6], the script exits. This is the gist
# of how this "dynamic" printing and layout works.
#
# This method allows ascii art to be stored without markers for info
# and it allows for easy swapping of info order and amount.
#
# $[2] ___ $[3] goldie@KISS
# $[4](.· | $[5] os KISS Linux
# (<> |
# / __ \
# ( / \ /|
# _/\ __)/_)
# \/-____\/
# $[1]
#
# $[6] /home/goldie $
# End here if no data was found.
[ "$2" ] || return
# Store the value of '$1' as we reset the argument list below.
name=$1
# Use 'set --' as a means of stripping all leading and trailing
# white-space from the info string. This also normalizes all
# white-space inside of the string.
#
# Disable the shellcheck warning for word-splitting
# as it's safe and intended ('set -f' disables globbing).
# shellcheck disable=2046,2086
{
set -f
set +f -- $2
info=$*
}
# Move the cursor to the right, the width of the ascii art with an
# additional gap for text spacing.
esc_p CUF "$ascii_width"
# Print the info name and color the text.
esc_p SGR "3${PF_COL1-4}";
esc_p SGR 1
printf '%s' "$name"
esc_p SGR 0
# Print the info name and info data separator.
printf %s "$PF_SEP"
# Move the cursor backward the length of the *current* info name and
# then move it forwards the length of the *longest* info name. This
# aligns each info data line.
esc_p CUB "${#name}"
esc_p CUF "${PF_ALIGN:-$info_length}"
# Print the info data, color it and strip all leading whitespace
# from the string.
esc_p SGR "3${PF_COL2-7}"
printf '%s' "$info"
esc_p SGR 0
printf '\n'
# Keep track of the number of times 'log()' has been run.
info_height=$((${info_height:-0} + 1))
}
get_title() {
# Username is retrieved by first checking '$USER' with a fallback
# to the 'id -un' command.
user=${USER:-$(id -un)}
# Hostname is retrieved by first checking '$HOSTNAME' with a fallback
# to the 'hostname' command.
#
# Disable the warning about '$HOSTNAME' being undefined in POSIX sh as
# the intention for using it is allowing the user to overwrite the
# value on invocation.
# shellcheck disable=SC2039
host=${HOSTNAME:-${host:-$(hostname)}}
# If the hostname is still not found, fallback to the contents of the
# /etc/hostname file.
[ "$host" ] || read -r host < /etc/hostname
# Add escape sequences for coloring to user and host name. As we embed
# them directly in the arguments passed to log(), we cannot use esc_p().
esc SGR 1
user=$e$user
esc SGR "3${PF_COL3:-1}"
user=$e$user
esc SGR 1
user=$user$e
esc SGR 1
host=$e$host
esc SGR "3${PF_COL3:-1}"
host=$e$host
log "${user}@${host}" " " >&6
}
get_os() {
# This function is called twice, once to detect the distribution name
# for the purposes of picking an ascii art early and secondly to display
# the distribution name in the info output (if enabled).
#
# On first run, this function displays _nothing_, only on the second
# invocation is 'log()' called.
[ "$distro" ] && {
log os "$distro" >&6
return
}
case $os in
(Linux*)
# Some Linux distributions (which are based on others)
# fail to identify as they **do not** change the upstream
# distribution's identification packages or files.
#
# It is senseless to add a special case in the code for
# each and every distribution (which _is_ technically no
# different from what it is based on) as they're either too
# lazy to modify upstream's identification files or they
# don't have the know-how (or means) to ship their own
# lsb-release package.
#
# This causes users to think there's a bug in system detection
# tools like neofetch or pfetch when they technically *do*
# function correctly.
#
# Exceptions are made for distributions which are independent,
# not based on another distribution or follow different
# standards.
#
# This applies only to distributions which follow the standard
# by shipping unmodified identification files and packages
# from their respective upstreams.
if has lsb_release; then
distro=$(lsb_release -sd)
# Android detection works by checking for the existence of
# the follow two directories. I don't think there's a simpler
# method than this.
elif [ -d /system/app ] && [ -d /system/priv-app ]; then
distro="Android $(getprop ro.build.version.release)"
else
# This used to be a simple '. /etc/os-release' but I believe
# this is insecure as we blindly executed whatever was in the
# file. This parser instead simply handles 'key=val', treating
# the file contents as plain-text.
while IFS='=' read -r key val; do
case $key in
(PRETTY_NAME)
distro=$val
;;
esac
done < /etc/os-release
fi
# 'os-release' and 'lsb_release' sometimes add quotes
# around the distribution name, strip them.
distro=${distro##[\"\']}
distro=${distro%%[\"\']}
# Special cases for (independent) distributions which
# don't follow any os-release/lsb standards whatsoever.
has crux && distro=$(crux)
has guix && distro='Guix System'
# Check to see if we're running Bedrock Linux which is
# very unique. This simply checks to see if the user's
# PATH contains a Bedrock specific value.
case $PATH in
(*/bedrock/cross/*)
distro='Bedrock Linux'
;;
esac
# Check to see if Linux is running in Windows 10 under
# WSL1 (Windows subsystem for Linux [version 1]) and
# append a string accordingly.
#
# If the kernel version string ends in "-Microsoft",
# we're very likely running under Windows 10 in WSL1.
if [ "$WSLENV" ]; then
distro="${distro}${WSLENV+ on Windows 10 [WSL2]}"
# Check to see if Linux is running in Windows 10 under
# WSL2 (Windows subsystem for Linux [version 2]) and
# append a string accordingly.
#
# This checks to see if '$WSLENV' is defined. This
# appends the Windows 10 string even if '$WSLENV' is
# empty. We only need to check that is has been _exported_.
elif [ -z "${kernel%%*-Microsoft}" ]; then
distro="$distro on Windows 10 [WSL1]"
fi
;;
(Darwin*)
# Parse the SystemVersion.plist file to grab the macOS
# version. The file is in the following format:
#
# <key>ProductVersion</key>
# <string>10.14.6</string>
#
# 'IFS' is set to '<>' to enable splitting between the
# keys and a second 'read' is used to operate on the
# next line directly after a match.
#
# '_' is used to nullify a field. '_ _ line _' basically
# says "populate $line with the third field's contents".
while IFS='<>' read -r _ _ line _; do
case $line in
# Match 'ProductVersion' and read the next line
# directly as it contains the key's value.
ProductVersion)
IFS='<>' read -r _ _ mac_version _
break
;;
esac
done < /System/Library/CoreServices/SystemVersion.plist
# Use the ProductVersion to determine which macOS/OS X codename
# the system has. As far as I'm aware there's no "dynamic" way
# of grabbing this information.
case $mac_version in
(10.4*) distro='Mac OS X Tiger' ;;
(10.5*) distro='Mac OS X Leopard' ;;
(10.6*) distro='Mac OS X Snow Leopard' ;;
(10.7*) distro='Mac OS X Lion' ;;
(10.8*) distro='OS X Mountain Lion' ;;
(10.9*) distro='OS X Mavericks' ;;
(10.10*) distro='OS X Yosemite' ;;
(10.11*) distro='OS X El Capitan' ;;
(10.12*) distro='macOS Sierra' ;;
(10.13*) distro='macOS High Sierra' ;;
(10.14*) distro='macOS Mojave' ;;
(10.15*) distro='macOS Catalina' ;;
(*) distro='macOS' ;;
esac
distro="$distro $mac_version"
;;
(Haiku)
# Haiku uses 'uname -v' for version information
# instead of 'uname -r' which only prints '1'.
distro=$(uname -sv)
;;
(Minix|DragonFly)
distro="$os $kernel"
# Minix and DragonFly don't support the escape
# sequences used, clear the exit trap.
trap '' EXIT
;;
(SunOS)
# Grab the first line of the '/etc/release' file
# discarding everything after '('.
IFS='(' read -r distro _ < /etc/release
;;
(OpenBSD*)
# Show the OpenBSD version type (current if present).
# kern.version=OpenBSD 6.6-current (GENERIC.MP) ...
IFS=' =' read -r _ distro openbsd_ver _ <<-EOF
$(sysctl kern.version)
EOF
distro="$distro $openbsd_ver"
;;
FreeBSD)
distro="$os $(freebsd-version)"
;;
(*)
# Catch all to ensure '$distro' is never blank.
# This also handles the BSDs.
distro="$os $kernel"
;;
esac
}
get_kernel() {
case $os in
# Don't print kernel output on some systems as the
# OS name includes it.
(*BSD*|Haiku|Minix)
return
;;
esac
# '$kernel' is the cached output of 'uname -r'.
log kernel "$kernel" >&6
}
get_host() {
case $os in
(Linux*)
# Despite what these files are called, version doesn't
# always contain the version nor does name always contain
# the name.
read -r name < /sys/devices/virtual/dmi/id/product_name
read -r version < /sys/devices/virtual/dmi/id/product_version
read -r model < /sys/firmware/devicetree/base/model
host="$name $version $model"
;;
(Darwin* | FreeBSD* | DragonFly*)
host=$(sysctl -n hw.model)
;;
(NetBSD*)
host=$(sysctl -n machdep.dmi.system-vendor \
machdep.dmi.system-product)
;;
(OpenBSD*)
host=$(sysctl -n hw.version)
;;
(*BSD* | Minix)
host=$(sysctl -n hw.vendor hw.product)
;;
esac
# Turn the host string into an argument list so we can iterate
# over it and remove OEM strings and other information which
# shouldn't be displayed.
#
# Disable the shellcheck warning for word-splitting
# as it's safe and intended ('set -f' disables globbing).
# shellcheck disable=2046,2086
{
set -f
set +f -- $host
host=
}
# Iterate over the host string word by word as a means of stripping
# unwanted and OEM information from the string as a whole.
#
# This could have been implemented using a long 'sed' command with
# a list of word replacements, however I want to show that something
# like this is possible in pure sh.
#
# This string reconstruction is needed as some OEMs either leave the
# identification information as "To be filled by OEM", "Default",
# "undefined" etc and we shouldn't print this to the screen.
for word do
# This works by reconstructing the string by excluding words
# found in the "blacklist" below. Only non-matches are appended
# to the final host string.
case $word in
(To | [Bb]e | [Ff]illed | [Bb]y | O.E.M. | OEM |\
Not | Applicable | Specified | System | Product | Name |\
Version | Undefined | Default | string | INVALID | � | os )
continue
;;
esac
host="$host$word "
done
# '$arch' is the cached output from 'uname -m'.
log host "${host:-$arch}" >&6
}
get_uptime() {
# Uptime works by retrieving the data in total seconds and then
# converting that data into days, hours and minutes using simple
# math.
case $os in
(Linux* | Minix*)
IFS=. read -r s _ < /proc/uptime
;;
Darwin* | *BSD* | DragonFly*)
s=$(sysctl -n kern.boottime)
# Extract the uptime in seconds from the following output:
# [...] { sec = 1271934886, usec = 667779 } Thu Apr 22 12:14:46 2010
s=${s#*=}
s=${s%,*}
# The uptime format from 'sysctl' needs to be subtracted from
# the current time in seconds.
s=$(($(date +%s) - s))
;;
(Haiku)
# The boot time is returned in microseconds, convert it to
# regular seconds.
s=$(($(system_time) / 1000000))
;;
(SunOS)
# Split the output of 'kstat' on '.' and any white-space
# which exists in the command output.
#
# The output is as follows:
# unix:0:system_misc:snaptime 14809.906993005
#
# The parser extracts: ^^^^^
IFS=' .' read -r _ s _ <<-EOF
$(kstat -p unix:0:system_misc:snaptime)
EOF
;;
(IRIX)
# Grab the uptime in a pretty format. Usually,
# 00:00:00 from the 'ps' command.
t=$(LC_ALL=POSIX ps -o etime= -p 1)
# Split the pretty output into days or hours
# based on the uptime.
case $t in
(*-*) d=${t%%-*} t=${t#*-} ;;
(*:*:*) h=${t%%:*} t=${t#*:} ;;
esac
h=${h#0} t=${t#0}
# Convert the split pretty fields back into
# seconds so we may re-convert them to our format.
s=$((${d:-0}*86400 + ${h:-0}*3600 + ${t%%:*}*60 + ${t#*:}))
;;
esac
# Convert the uptime from seconds into days, hours and minutes.
d=$((s / 60 / 60 / 24))
h=$((s / 60 / 60 % 24))
m=$((s / 60 % 60))
# Only append days, hours and minutes if they're non-zero.
case "$d" in ([!0]*) uptime="${uptime}${d}d "; esac
case "$h" in ([!0]*) uptime="${uptime}${h}h "; esac
case "$m" in ([!0]*) uptime="${uptime}${m}m "; esac
log uptime "${uptime:-0m}" >&6
}
get_pkgs() {
# This works by first checking for which package managers are
# installed and finally by printing each package manager's
# package list with each package one per line.
#
# The output from this is then piped to 'wc -l' to count each
# line, giving us the total package count of whatever package
# managers are installed.
#
# Backticks are *required* here as '/bin/sh' on macOS is
# 'bash 3.2' and it can't handle the following:
#
# var=$(
# code here
# )
#
# shellcheck disable=2006
packages=`
case $os in
(Linux*)
# Commands which print packages one per line.
has bonsai && bonsai list
has crux && pkginfo -i
has pacman-key && pacman -Qq
has dpkg && dpkg-query -f '.\n' -W
has rpm && rpm -qa
has xbps-query && xbps-query -l
has apk && apk info
has guix && guix package --list-installed
has opkg && opkg list-installed
# Directories containing packages.
has kiss && printf '%s\n' /var/db/kiss/installed/*/
has cpt-list && printf '%s\n' /var/db/cpt/installed/*/
has brew && printf '%s\n' "$(brew --cellar)/"*
has emerge && printf '%s\n' /var/db/pkg/*/*/
has pkgtool && printf '%s\n' /var/log/packages/*
has eopkg && printf '%s\n' /var/lib/eopkg/package/*
# 'nix' requires two commands.
has nix-store && {
nix-store -q --requisites /run/current-system/sw
nix-store -q --requisites ~/.nix-profile
}
;;
(Darwin*)
# Commands which print packages one per line.
has pkgin && pkgin list
# Directories containing packages.
has brew && printf '%s\n' /usr/local/Cellar/*
# 'port' prints a single line of output to 'stdout'
# when no packages are installed and exits with
# success causing a false-positive of 1 package
# installed.
#
# 'port' should really exit with a non-zero code
# in this case to allow scripts to cleanly handle
# this behavior.
has port && {
pkg_list=$(port installed)
case "$pkg_list" in
("No ports are installed.")
# do nothing
;;
(*)
printf '%s\n' "$pkg_list"
;;
esac
}
;;
(FreeBSD*|DragonFly*)
pkg info
;;
(OpenBSD*)
printf '%s\n' /var/db/pkg/*/
;;
(NetBSD*)
pkg_info
;;
(Haiku)
printf '%s\n' /boot/system/package-links/*
;;
(Minix)
printf '%s\n' /usr/pkg/var/db/pkg/*/
;;
(SunOS)
has pkginfo && pkginfo -i
has pkg && pkg list
;;
(IRIX)
versions -b
;;
esac | wc -l
`
case $os in
# IRIX's package manager adds 3 lines of extra
# output which we must account for here.
(IRIX)
packages=$((packages - 3))
;;
esac
case $packages in
(1?*|[2-9]*)
log pkgs "$packages" >&6
;;
esac
}
get_memory() {
case $os in
# Used memory is calculated using the following "formula":
# MemUsed = MemTotal + Shmem - MemFree - Buffers - Cached - SReclaimable
# Source: https://github.com/KittyKatt/screenFetch/issues/386
(Linux*)
# Parse the '/proc/meminfo' file splitting on ':' and 'k'.
# The format of the file is 'key: 000kB' and an additional
# split is used on 'k' to filter out 'kB'.
while IFS=':k ' read -r key val _; do
case $key in
(MemTotal)
mem_used=$((mem_used + val))
mem_full=$val
;;
(Shmem)
mem_used=$((mem_used + val))
;;
(MemFree | Buffers | Cached | SReclaimable)
mem_used=$((mem_used - val))
;;
# If detected this will be used over the above calculation
# for mem_used. Available since Linux 3.14rc.
# See kernel commit 34e431b0ae398fc54ea69ff85ec700722c9da773
(MemAvailable)
mem_avail=$val
;;
esac
done < /proc/meminfo
case $mem_avail in
(*[0-9]*)
mem_used=$(((mem_full - mem_avail) / 1024))
;;
*)
mem_used=$((mem_used / 1024))
;;
esac
mem_full=$((mem_full / 1024))
;;
# Used memory is calculated using the following "formula":
# (wired + active + occupied) * 4 / 1024
(Darwin*)
mem_full=$(($(sysctl -n hw.memsize) / 1024 / 1024))
# Parse the 'vmstat' file splitting on ':' and '.'.
# The format of the file is 'key: 000.' and an additional
# split is used on '.' to filter it out.
while IFS=:. read -r key val; do
case $key in
(*' wired'*|*' active'*|*' occupied'*)
mem_used=$((mem_used + ${val:-0}))
;;
esac
# Using '<<-EOF' is the only way to loop over a command's
# output without the use of a pipe ('|').
# This ensures that any variables defined in the while loop
# are still accessible in the script.
done <<-EOF
$(vm_stat)
EOF
mem_used=$((mem_used * 4 / 1024))
;;
(OpenBSD*)
mem_full=$(($(sysctl -n hw.physmem) / 1024 / 1024))
# This is a really simpler parser for 'vmstat' which grabs
# the used memory amount in a lazy way. 'vmstat' prints 3
# lines of output with the needed value being stored in the
# final line.
#
# This loop simply grabs the 3rd element of each line until
# the EOF is reached. Each line overwrites the value of the
# previous one so we're left with what we wanted. This isn't
# slow as only 3 lines are parsed.
while read -r _ _ line _; do
mem_used=${line%%M}
# Using '<<-EOF' is the only way to loop over a command's
# output without the use of a pipe ('|').
# This ensures that any variables defined in the while loop
# are still accessible in the script.
done <<-EOF
$(vmstat)
EOF
;;
# Used memory is calculated using the following "formula":
# mem_full - ((inactive + free + cache) * page_size / 1024)
(FreeBSD*|DragonFly*)
mem_full=$(($(sysctl -n hw.physmem) / 1024 / 1024))
# Use 'set --' to store the output of the command in the
# argument list. POSIX sh has no arrays but this is close enough.
#
# Disable the shellcheck warning for word-splitting
# as it's safe and intended ('set -f' disables globbing).
# shellcheck disable=2046
{
set -f
set +f -- $(sysctl -n hw.pagesize \
vm.stats.vm.v_inactive_count \
vm.stats.vm.v_free_count \
vm.stats.vm.v_cache_count)
}
# Calculate the amount of used memory.
# $1: hw.pagesize
# $2: vm.stats.vm.v_inactive_count
# $3: vm.stats.vm.v_free_count
# $4: vm.stats.vm.v_cache_count
mem_used=$((mem_full - (($2 + $3 + $4) * $1 / 1024 / 1024)))
;;
(NetBSD*)
mem_full=$(($(sysctl -n hw.physmem64) / 1024 / 1024))
# NetBSD implements a lot of the Linux '/proc' filesystem,
# this uses the same parser as the Linux memory detection.
while IFS=':k ' read -r key val _; do
case $key in
(MemFree)
mem_free=$((val / 1024))
break
;;
esac
done < /proc/meminfo
mem_used=$((mem_full - mem_free))
;;
(Haiku)
# Read the first line of 'sysinfo -mem' splitting on
# '(', ' ', and ')'. The needed information is then
# stored in the 5th and 7th elements. Using '_' "consumes"
# an element allowing us to proceed to the next one.
#
# The parsed format is as follows:
# 3501142016 bytes free (used/max 792645632 / 4293787648)
IFS='( )' read -r _ _ _ _ mem_used _ mem_full <<-EOF
$(sysinfo -mem)
EOF
mem_used=$((mem_used / 1024 / 1024))
mem_full=$((mem_full / 1024 / 1024))
;;
(Minix)
# Minix includes the '/proc' filesystem though the format
# differs from Linux. The '/proc/meminfo' file is only a
# single line with space separated elements and elements
# 2 and 3 contain the total and free memory numbers.
read -r _ mem_full mem_free _ < /proc/meminfo
mem_used=$(((mem_full - mem_free) / 1024))
mem_full=$(( mem_full / 1024))
;;
(SunOS)
hw_pagesize=$(pagesize)
# 'kstat' outputs memory in the following format:
# unix:0:system_pages:pagestotal 1046397
# unix:0:system_pages:pagesfree 885018
#
# This simply uses the first "element" (white-space
# separated) as the key and the second element as the
# value.
#
# A variable is then assigned based on the key.
while read -r key val; do
case $key in
(*total)
pages_full=$val
;;
(*free)
pages_free=$val
;;
esac
done <<-EOF
$(kstat -p unix:0:system_pages:pagestotal \
unix:0:system_pages:pagesfree)
EOF
mem_full=$((pages_full * hw_pagesize / 1024 / 1024))
mem_free=$((pages_free * hw_pagesize / 1024 / 1024))
mem_used=$((mem_full - mem_free))
;;
(IRIX)
# Read the memory information from the 'top' command. Parse
# and split each line until we reach the line starting with
# "Memory".
#
# Example output: Memory: 160M max, 147M avail, .....
while IFS=' :' read -r label mem_full _ mem_free _; do
case $label in
(Memory)
mem_full=${mem_full%M}
mem_free=${mem_free%M}
break
;;
esac
done <<-EOF
$(top -n)
EOF
mem_used=$((mem_full - mem_free))
;;
esac
log memory "${mem_used:-?}M / ${mem_full:-?}M" >&6
}
get_wm() {
case $os in
(Darwin*)
# Don't display window manager on macOS.
;;
(*)
# xprop can be used to grab the window manager's properties
# which contains the window manager's name under '_NET_WM_NAME'.
#
# The upside to using 'xprop' is that you don't need to hardcode
# a list of known window manager names. The downside is that
# not all window managers conform to setting the '_NET_WM_NAME'
# atom..
#
# List of window managers which fail to set the name atom:
# catwm, fvwm, dwm, 2bwm, monster, wmaker and sowm [mine! ;)].
#
# The final downside to this approach is that it does _not_
# support Wayland environments. The only solution which supports
# Wayland is the 'ps' parsing mentioned below.
#
# A more naive implementation is to parse the last line of
# '~/.xinitrc' to extract the second white-space separated
# element.
#
# The issue with an approach like this is that this line data
# does not always equate to the name of the window manager and
# could in theory be _anything_.
#
# This also fails when the user launches xorg through a display
# manager or other means.
#
#
# Another naive solution is to parse 'ps' with a hardcoded list
# of window managers to detect the current window manager (based
# on what is running).
#
# The issue with this approach is the need to hardcode and
# maintain a list of known window managers.
#
# Another issue is that process names do not always equate to
# the name of the window manager. False-positives can happen too.
#
# This is the only solution which supports Wayland based
# environments sadly. It'd be nice if some kind of standard were
# established to identify Wayland environments.
#
# pfetch's goal is to remain _simple_, if you'd like a "full"
# implementation of window manager detection use 'neofetch'.
#
# Neofetch use a combination of 'xprop' and 'ps' parsing to
# support all window managers (including non-conforming and
# Wayland) though it's a lot more complicated!
# Don't display window manager if X isn't running.
[ "$DISPLAY" ] || return
# This is a two pass call to xprop. One call to get the window
# manager's ID and another to print its properties.
has xprop && {
# The output of the ID command is as follows:
# _NET_SUPPORTING_WM_CHECK: window id # 0x400000
#
# To extract the ID, everything before the last space
# is removed.
id=$(xprop -root -notype _NET_SUPPORTING_WM_CHECK)
id=${id##* }
# The output of the property command is as follows:
# _NAME 8t
# _NET_WM_PID = 252
# _NET_WM_NAME = "bspwm"
# _NET_SUPPORTING_WM_CHECK: window id # 0x400000
# WM_CLASS = "wm", "Bspwm"
#
# To extract the name, everything before '_NET_WM_NAME = \"'
# is removed and everything after the next '"' is removed.
wm=$(xprop -id "$id" -notype -len 25 -f _NET_WM_NAME 8t)
}
# Handle cases of a window manager _not_ populating the
# '_NET_WM_NAME' atom. Display nothing in this case.
case $wm in
(*'_NET_WM_NAME = '*)
wm=${wm##*_NET_WM_NAME = \"}
wm=${wm%%\"*}
;;
(*)
# Fallback to checking the process list
# for the select few window managers which
# don't set '_NET_WM_NAME'.
while read -r ps_line; do
case $ps_line in
(*catwm*) wm=catwm ;;
(*fvwm*) wm=fvwm ;;
(*dwm*) wm=dwm ;;
(*2bwm*) wm=2bwm ;;
(*monsterwm*) wm=monsterwm ;;
(*wmaker*) wm='Window Maker' ;;
(*sowm*) wm=sowm ;;
esac
done <<-EOF
$(ps x)
EOF
;;
esac
;;
esac
log wm "$wm" >&6
}