303 lines
9.6 KiB
Bash
Executable File
303 lines
9.6 KiB
Bash
Executable File
#!/bin/sh
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# shellcheck source=/dev/null
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#
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# pfetch - Simple POSIX sh fetch script.
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log() {
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# The 'log()' function handles the printing of information.
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# In 'pfetch' (and 'neofetch'!) the printing of the ascii art and info
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# happen independently of each other.
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#
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# The size of the ascii art is stored and the ascii is printed first.
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# Once the ascii is printed, the cursor is located right below the art
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# (See marker $[1]).
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#
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# Using the stored ascii size, the cursor is then moved to marker $[2].
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# This is simply a cursor up escape sequence using the "height" of the
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# ascii art.
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#
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# 'log()' then moves the cursor to the right the "width" of the ascii art
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# with an additional amount of padding to add a gap between the art and
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# the information (See marker $[3]).
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#
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# When 'log()' has executed the cursor is then located at marker $[4].
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# When 'log()' is run a second time, the next line of information is
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# printed, moving the cursor to marker $[5].
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#
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# Markers $[4] and $[5] repeat all the way down through the ascii art
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# until there is no more information left to print.
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#
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# Every time 'log()' is called the script keeps track of how many lines
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# were printed. When printing is complete the cursor is then manually
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# placed below the information and the art according to the "heights"
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# of both.
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#
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# The math is simple: move cursor down $((ascii_height - info_height)).
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# If the aim is to move the cursor from marker $[5] to marker $[6],
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# plus the ascii height is 8 while the info height is 2 it'd be a move
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# of 6 lines downwards.
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#
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# Once the cursor is at marker $[6], the script exits. This is the gist
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# of how this "dynamic" printing and layout works.
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#
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# This method allows ascii art to be stored without markers for info
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# and it allows for easy swapping of info order and amount.
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#
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# $[2] ___ $[3] goldie@KISS
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# $[4](.· | $[5] os KISS Linux
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# (<> |
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# / __ \
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# ( / \ /|
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# _/\ __)/_)
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# \/-____\/
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# $[1]
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#
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# $[6] /home/goldie $
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#
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# PF_COL1: Control color of info name.
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# PF_SEP: Control the separator between info name and info data.
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# PF_COL2: Control color of info data.
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#
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# '\033[14C': Move cursor 14 characters to the right.
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# TODO: Base this on ASCII art width.
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#
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# '\033[3%s': Color formatting.
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# '\033[m': Reset formatting.
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#
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# '\033[%sD': Move cursor '${#1}' characters to the left.
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# This allows for aligned info names and data.
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#
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# '\033[6C': Move cursor 6 characters to the right.
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# This aligns the info.
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printf '\033[14C\033[3%s;1m%s\033[m%s\033[3%sm\033[%sD\033[6C%s\033[m\n' \
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"${PF_COL1:-5}" "$1" "${PF_SEP:- }" "${PF_COL2:-7}" "${#1}" "${2:-?}"
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# Keep track of the number of times 'log()' has been run.
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info_height=$((info_height + 1))
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}
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die() {
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printf '\033[31;1merror\033[m: %s.\n' "$@" >&2
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exit 1
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}
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get_title() {
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case $os in
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Linux*|GNU*)
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read -r hostname < /proc/sys/kernel/hostname
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;;
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esac
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# Username is retrieved by first checking '$USER' with a fallback
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# to the 'whoami' command.
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#
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# Hostname is retrieved by first checking '$HOSTNAME' with a fallback
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# to the OS specific detection above and finally an additional fallback
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# to the 'hostname' command.
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#
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# PF_SEP and PF_COL{1,2} change printing options in the 'log()' function.
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#
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# Disable the warning about '$HOSTNAME' being undefined in POSIX sh as
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# it is intended for allowing the user to overwrite the value on invocation.
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# shellcheck disable=SC2039
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PF_SEP=@ PF_COL1=1 PF_COL2='3;1' \
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log "${USER:-$(whoami)}" "${HOSTNAME:-${hostname:-$(hostname)}}"
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}
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get_distro() {
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case $os in
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Linux*|GNU*)
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. /etc/os-release && distro=$PRETTY_NAME
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;;
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esac
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log os "$distro"
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}
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get_kernel() {
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log kernel "$kernel"
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}
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get_host() {
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case $os in
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Linux*|GNU*)
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# Despite what these files are called, version doesn't
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# always contain the version nor does name always contain
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# the name.
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read -r name < /sys/devices/virtual/dmi/id/product_name
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read -r version < /sys/devices/virtual/dmi/id/product_version
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read -r model < /sys/firmware/devicetree/base/model
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host="$name $version $model"
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;;
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esac
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log host "$host"
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}
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get_uptime() {
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# Uptime works by retrieving the data in total seconds and then
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# converting that data into days, hours and minutes using simple
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# math.
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case $os in
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Linux*|GNU*)
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IFS=. read -r s _ < /proc/uptime
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;;
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esac
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# Convert the uptime from seconds into days, hours and minutes.
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d=$((s / 60 / 60 / 24))
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h=$((s / 60 / 60 % 24))
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m=$((s / 60 % 60))
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# Only append days, hours and minutes if they're non-zero.
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[ "$d" = 0 ] || uptime="${uptime}${d}d "
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[ "$h" = 0 ] || uptime="${uptime}${h}h "
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[ "$m" = 0 ] || uptime="${uptime}${m}m "
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log uptime "${uptime:-0m}"
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}
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get_packages() {
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# Simple function to avoid '>/dev/null' spam.
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# This checks to see if a command is in '$PATH'.
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has() { command -v "$1" >/dev/null; }
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# This works by first checking for which package managers are
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# isntalled and finally by printing each package manager's
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# package list with each package one per line.
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#
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# The output from this is then piped to 'wc -l' to count each
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# line, giving us the total package count of whatever package
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# managers are installed.
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packages=$(
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case $os in
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Linux*|GNU*)
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# Commands which print packages one per line.
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has kiss && kiss l
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has bonsai && bonsai list
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has pacman-key && pacman -Qq
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has dpkg && dpkg-query -f '.\n' -W
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has rpm && rpm -qa
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has xbps-query && xbps-query -l
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has apk && apk info
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# Directories containing packages.
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has brew && printf '%s\n' "$(brew --cellar)/"*
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has emerge && printf '%s\n' /var/db/pkg/*/*/
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;;
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esac | wc -l
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)
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log pkgs "$packages"
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}
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get_memory() {
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case $os in
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# Used memory is calculated using the following "formula" (Linux):
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# MemUsed = MemTotal + Shmem - MemFree - Buffers - Cached - SReclaimable
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# Source: https://github.com/KittyKatt/screenFetch/issues/386
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Linux*|GNU*)
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# Parse the '/proc/meminfo' file splitting on ':' and 'k'.
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# The format of the file is 'key: 000kB' and an additional
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# split is used on 'k' to filter out 'kB'.
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while IFS=:k read -r key val _; do
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case $key in
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MemTotal)
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mem_used=$((mem_used + val))
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mem_total=$val
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;;
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Shmem)
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mem_used=$((mem_used + val))
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;;
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MemFree|Buffers|Cached|SReclaimable)
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mem_used=$((mem_used - val))
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;;
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esac
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done < /proc/meminfo
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mem_used=$((mem_used / 1024))
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mem_total=$((mem_total / 1024))
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;;
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esac
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log memory "${mem_used}MiB / ${mem_total}MiB"
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}
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get_ascii() {
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case $os in
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Linux*|GNU*)
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ascii="\
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${c4} ___
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(${c7}.· ${c4}|
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(${c5}<> ${c4}|
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/ ${c7}__ ${c4}\\
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( ${c7}/ \\ ${c4}/|
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${c5}_${c4}/\\ ${c7}__)${c4}/${c5}_${c4})
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${c5}\/${c4}-____${c5}\/
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"
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;;
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esac
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# Store the height of the ascii art for cursor positioning.
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# This script prints to the screen *almost* like a TUI does.
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# It uses escape sequences to allow dynamic printing of the
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# information through user configuration.
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ascii_height=$(printf %s "$ascii" | wc -l)
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# Print the ascii art and position the cursor back where we
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# started prior to printing it.
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# '\033[?25l': Hide the cursor.
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# '\033[1m': Print the ascii in bold.
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# '\033[m': Clear bold.
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# '\033[%sA: Move the cursor up '$ascii_height' amount of lines.
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printf '\033[?25l\033[1m%s\033[m\033[%sA' "$ascii" "$ascii_height"
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}
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main() {
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# Hide 'stderr' unless the first argument is '-v'. This saves
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# polluting the script with '2>/dev/null'.
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[ "$1" = -v ] || exec 2>/dev/null
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# Generic color list.
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# Disable warning about unused variables.
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# shellcheck disable=2034
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{
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c1='[31m'; c2='[32m'
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c3='[33m'; c4='[34m'
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c5='[35m'; c6='[36m'
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c7='[37m'; c8='[38m'
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}
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# Store the output of 'uname' to avoid calling it multiple times
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# throughout the script. 'read <<EOF' is the simplest way of reading
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# a command into a list of variables.
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read -r os kernel <<EOF
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$(uname -sr)
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EOF
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get_ascii
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get_title
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get_distro
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get_host
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get_kernel
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get_uptime
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get_packages
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get_memory
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# Position the cursor below both the ascii art and information lines
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# according to the height of both. If the information exceeds the ascii
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# art in height, don't touch the cursor, else move it down N lines.
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#
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# 'log' contains the amount of 'get_' info lines that were printed.
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#
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# '\033[%sB': Move the cursor down N lines.
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# '\033[?25h': Un-hide the cursor.
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printf '\033[%sB\n\033[?25h' \
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"$((info_height > ascii_height ? 0 : ascii_height - info_height))"
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}
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main "$@"
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