882 lines
25 KiB
Bash
Executable File
882 lines
25 KiB
Bash
Executable File
#!/bin/sh
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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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# However, if the information printed is "taller" (takes up more lines)
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# than the ascii art, the cursor isn't moved at all!
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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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# Move the cursor to the right, the width of the ascii art with an
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# additional gap for text spacing.
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printf '[%sC' "${ascii_width--1}"
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# Print the info name and color the text.
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printf '[3%s;1m%s[m' "${PF_COL1-4}" "$1"
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# Print the info name and info data separator.
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printf '%s' "$PF_SEP"
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# Move the cursor backward the length of the *current* info name and
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# then move it forwards the length of the *longest* info name. This
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# aligns each info data line.
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printf '[%sD[%sC' "${#1}" "${PF_ALIGN-$info_length}"
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# Print the info data, color it and strip all leading whitespace
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# from the string.
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printf '[3%sm%s[m\n' "${PF_COL2-7}" "${2#${2%%[![:space:]]*}}"
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# Keep track of the number of times 'log()' has been run.
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: $((info_height+=1))
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}
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get_title() {
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# Username is retrieved by first checking '$USER' with a fallback
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# to the 'whoami' command.
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user=${USER:-$(whoami)}
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# Hostname is retrieved by first checking '$HOSTNAME' with a fallback
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# to the 'hostname' command.
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#
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# Disable the warning about '$HOSTNAME' being undefined in POSIX sh as
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# the intention for using it is allowing the user to overwrite the
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# value on invocation.
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# shellcheck disable=SC2039
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host=${HOSTNAME:-${hostname:-$(hostname)}}
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log "[3${PF_COL3:-1}m${user}${c7}@[3${PF_COL3:-1}m${host}" >&6
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}
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get_os() {
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# This function is called twice, once to detect the distribution name
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# for the purposes of picking an ascii art early and secondly to display
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# the distribution name in the info output (if enabled).
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#
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# On first run, this function displays _nothing_, only on the second
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# invocation is 'log()' called.
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[ "$distro" ] && {
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log os "$distro" >&6
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return
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}
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case $os in
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Linux*)
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command -v lsb_release && distro=$(lsb_release -sd)
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# Disable warning about shellcheck not being able
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# to read '/etc/os-release'. This is fine.
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# shellcheck source=/dev/null
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. /etc/os-release && distro=$PRETTY_NAME
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# Special cases for distributions which don't follow.
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# the '/etc/os-release' "standard".
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command -v crux && distro=$(crux)
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command -v guix && distro='Guix System'
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;;
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Darwin*)
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# Parse the SystemVersion.plist file to grab the macOS
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# versions. The file is in the following format:
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#
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# <key>ProductVersion</key>
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# <string>10.14.6</string>
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#
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# 'IFS' is set to '<>' to enable splitting between the
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# keys and a second 'read' is used to operate on the
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# next line directly after a match.
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#
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# '_' is used to nullify a field. '_ _ line _' basically
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# says "populate $line with the third field's contents".
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while IFS='<>' read -r _ _ line _; do
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case $line in
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# To avoid duplicating code, we use the name of
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# the key (eg ProductVersion) as the name of the
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# shell variable containing the value.
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ProductVersion|ProductBuildVersion)
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IFS='<>' read -r _ _ "${line?}" _
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;;
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esac
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done < /System/Library/CoreServices/SystemVersion.plist
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# Use the ProductVersion to determine which macOS/OS X codename
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# the system has. As far as I'm aware there's no "dynamic" way
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# of grabbing this information.
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case ${ProductVersion?} in
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10.4*) distro="Mac OS X Tiger" ;;
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10.5*) distro="Mac OS X Leopard" ;;
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10.6*) distro="Mac OS X Snow Leopard" ;;
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10.7*) distro="Mac OS X Lion" ;;
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10.8*) distro="OS X Mountain Lion" ;;
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10.9*) distro="OS X Mavericks" ;;
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10.10*) distro="OS X Yosemite" ;;
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10.11*) distro="OS X El Capitan" ;;
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10.12*) distro="macOS Sierra" ;;
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10.13*) distro="macOS High Sierra" ;;
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10.14*) distro="macOS Mojave" ;;
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10.15*) distro="macOS Catalina" ;;
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*) distro="macOS" ;;
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esac
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distro="$distro ${ProductVersion?} ${ProductBuildVersion?}"
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;;
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*)
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# Catch all to ensure '$distro' is never blank.
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# This also handles the BSDs.
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distro="$os $kernel"
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;;
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esac
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}
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get_kernel() {
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# '$kernel' is the cached output of 'uname -r'.
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case $os in
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# Don't print kernel output on BSD systems as the
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# OS name includes it.
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*BSD*) ;;
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*)
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log kernel "$kernel" >&6
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;;
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esac
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}
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get_shell() {
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log shell "${SHELL##*/}" >&6
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}
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get_host() {
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case $os in
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Linux*)
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# Despite what these files are called, version doesn't
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# always contain the version nor does name always contain
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# the name.
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read -r name < /sys/devices/virtual/dmi/id/product_name
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read -r version < /sys/devices/virtual/dmi/id/product_version
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read -r model < /sys/firmware/devicetree/base/model
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host="$name $version $model"
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;;
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Darwin*)
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host=$(sysctl -n hw.model)
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;;
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*BSD*)
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host=$(sysctl -n hw.vendor hw.product)
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;;
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esac
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log host "$host" >&6
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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 $os in
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Linux*)
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IFS=. read -r s _ < /proc/uptime
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;;
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Darwin*|*BSD*)
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s=$(sysctl -n kern.boottime)
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# Extract the uptime in seconds from the following output:
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# [...] { sec = 1271934886, usec = 667779 } Thu Apr 22 12:14:46 2010
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s=${s#*=}
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s=${s%,*}
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# The uptime format from 'sysctl' needs to be subtracted from
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# the current time in seconds.
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s=$(($(date +%s) - s))
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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 "${uptime:-0m}" >&6
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}
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get_pkgs() {
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# This works by first checking for which package managers are
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# isntalled and finally by printing each package manager's
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# package list with each package one per line.
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#
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# The output from this is then piped to 'wc -l' to count each
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# line, giving us the total package count of whatever package
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# managers are installed.
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#
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# Backticks are *required* here as '/bin/sh' on macOS is
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# 'bash 3.2' and it can't handle the following:
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#
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# var=$(
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# code here
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# )
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#
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# shellcheck disable=2006
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packages=`
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case $os in
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Linux*)
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# Commands which print packages one per line.
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command -v kiss && kiss l
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command -v bonsai && bonsai list
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command -v pacman-key && pacman -Qq
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command -v dpkg && dpkg-query -f '.\n' -W
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command -v rpm && rpm -qa
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command -v xbps-query && xbps-query -l
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command -v apk && apk info
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# Directories containing packages.
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command -v brew && printf '%s\n' "$(brew --cellar)/"*
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command -v emerge && printf '%s\n' /var/db/pkg/*/*/
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# GUIX requires two commands.
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command -v guix && {
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guix package -p /run/current-system/profile -I
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guix package -I
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}
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;;
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Darwin*)
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# Commands which print packages one per line.
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command -v pkgin && pkgin list
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command -v port && port installed
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# Directories containing packages.
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command -v brew && printf '%s\n' /usr/local/Cellar/*
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;;
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FreeBSD*)
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# Commands which print packages one per line.
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command -v pkg && pkg info
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;;
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*BSD*)
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# Commands which print packages one per line.
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command -v pkginfo && pkginfo -i
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command -v pkg && pkg list
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command -v pkg_info && pkg_info
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;;
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esac | wc -l
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`
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log pkgs "$packages" >&6
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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*)
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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_full=$val
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;;
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Shmem)
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mem_used=$((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_full=$((mem_full / 1024))
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;;
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# Used memory is calculated using the following "formula" (MacOS):
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# wired + active + occupied * 4 / 1024
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Darwin*)
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mem_full=$(($(sysctl -n hw.memsize) / 1024 / 1024))
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# Parse the 'vmstat' file splitting on ':' and '.'.
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# The format of the file is 'key: 000.' and an additional
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# split is used on '.' to filter it out.
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while IFS=:. read -r key val; do
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case $key in
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*wired*|*active*|*occupied*)
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mem_used=$((mem_used + ${val:-0}))
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;;
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esac
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# Using '<<-EOF' is the only way to loop over a command's
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# output without the use of a pipe ('|') or subshell.
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# This ensures that any variables defined in the while loop
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# are still accessible in the script.
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done <<-EOF
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$(vm_stat)
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EOF
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mem_used=$((mem_used * 4 / 1024))
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;;
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OpenBSD*)
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# If you run OpenBSD and can send me the full output of
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# 'vm_stat' I'll be able to add full support here.
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mem_full=$(($(sysctl -n hw.physmem) / 1024 / 1024))
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;;
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FreeBSD*)
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# If you run FreeBSD and can help me get
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# the used memory amount, I'll be able to add support here.
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mem_full=$(($(sysctl -n hw.physmem) / 1024 / 1024))
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;;
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esac
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log memory "${mem_used:-?}MiB / ${mem_full:-?}MiB" >&6
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}
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get_ascii() {
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# This is a simple function to read the contents of
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# an ascii file from 'stdin'. It allows for the use
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# of '<<-EOF' to prevent the break in indentation in
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# this source code.
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#
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# This function also sets the text colors according
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# to the ascii color.
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read_ascii() {
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# 'PF_COL1': Set the info name color according to ascii color.
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# 'PF_COL3': Set the title color to some other color. ¯\_(ツ)_/¯
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PF_COL1=${PF_COL1:-${1:-7}}
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PF_COL3=${PF_COL3:-$((${1:-7}%8+1))}
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while IFS= read -r line; do
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ascii="$ascii$line
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"
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done
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}
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# This checks for ascii art in the following order:
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# '$1': Argument given to 'get_ascii()' directly.
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# '$PF_ASCII': Environment variable set by user.
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# '$distro': The detected distribution name.
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# '$os': The name of the operating system/kernel.
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#
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# NOTE: Each ascii art below is indented using tabs, this
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# allows indentation to continue naturally despite
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# the use of '<<-EOF'.
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case ${1:-${PF_ASCII:-${distro:-$os}}} in
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[Aa]lpine*)
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read_ascii 4 <<-EOF
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${c4} /\\ /\\
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/${c7}/ ${c4}\\ \\
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/${c7}/ ${c4}\\ \\
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/${c7}// ${c4}\\ \\
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${c7}// ${c4}\\ \\
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\\
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EOF
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;;
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[Aa]rch*)
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read_ascii 4 <<-EOF
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${c6} /\\
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/^^\\
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/\\ \\
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/${c7} __ \\
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/ ( ) \\
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/ __| |__\\\\
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/// \\\\\\
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EOF
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;;
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[Aa]rco*)
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read_ascii 4 <<-EOF
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${c4} /\\
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/ \\
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/ /\\ \\
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/ / \\ \\
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/ / \\ \\
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/ / _____\\ \\
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/_/ \`----.\\_\\
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EOF
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;;
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[Aa]rtix*)
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read_ascii 6 <<-EOF
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${c4} /\\
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/ \\
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/\`'.,\\
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/ ',
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/ ,\`\\
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/ ,.'\`. \\
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/.,'\` \`'.\\
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EOF
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;;
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[Cc]ent[Oo][Ss]*)
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read_ascii 5 <<-EOF
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${c2} ____${c3}^${c5}____
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${c2} |\\ ${c3}|${c5} /|
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${c2} | \\ ${c3}|${c5} / |
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${c5}<---- ${c4}---->
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${c4} | / ${c2}|${c3} \\ |
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${c4} |/__${c2}|${c3}__\\|
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${c2} v
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EOF
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;;
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[Dd]ebian*)
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read_ascii 1 <<-EOF
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${c1} _____
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/ __ \\
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| / |
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| \\___-
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-_
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--_
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EOF
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;;
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[Ee]lementary*)
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read_ascii <<-EOF
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${c7} _______
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/ ____ \\
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/ | / /\\
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|__\\ / / |
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\\ /__/ /
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\\_______/
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EOF
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;;
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[Ff]edora*)
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read_ascii 4 <<-EOF
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${c7} _____
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/ __)${c4}\\${c7}
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| / ${c4}\\ \\${c7}
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${c4}__${c7}_| |_${c4}_/ /${c7}
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${c4}/ ${c7}(_ _)${c4}_/${c7}
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${c4}/ /${c7} | |
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${c4}\\ \\${c7}__/ |
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${c4}\\${c7}(_____/
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EOF
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;;
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[Ff]ree[Bb][Ss][Dd]*)
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read_ascii 1 <<-EOF
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${c1} /\\ _____ /\\
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\\_) (_/
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/ \\
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| |
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| |
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\ /
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--_____--
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EOF
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;;
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[Gg]entoo*)
|
||
read_ascii 5 <<-EOF
|
||
${c5} _-----_
|
||
( \\
|
||
\\ 0 \\
|
||
${c7} \\ )
|
||
/ _/
|
||
( _-
|
||
\\____-
|
||
EOF
|
||
;;
|
||
|
||
[Gg]uix[Ss][Dd]*|guix*)
|
||
read_ascii 3 <<-EOF
|
||
${c3}|.__ __.|
|
||
|__ \\ / __|
|
||
\\ \\ / /
|
||
\\ \\ / /
|
||
\\ \\ / /
|
||
\\ \\/ /
|
||
\\__/
|
||
EOF
|
||
;;
|
||
|
||
[Hh]yperbola*)
|
||
read_ascii <<-EOF
|
||
${c7} |\`__.\`/
|
||
\____/
|
||
.--.
|
||
/ \\
|
||
/ ___ \\
|
||
/ .\` \`.\\
|
||
/.\` \`.\\
|
||
EOF
|
||
;;
|
||
|
||
[Ll]inux*[Ll]ite*)
|
||
read_ascii 3 <<-EOF
|
||
${c3} /\\
|
||
/ \\
|
||
/ ${c7}/ ${c3}/
|
||
> ${c7}/ ${c3}/
|
||
\\ ${c7}\\ ${c3}\\
|
||
\\_${c7}\\${c3}_\\
|
||
${c7} \\
|
||
EOF
|
||
;;
|
||
|
||
[Ll]inux*[Mm]int*|[Mm]int)
|
||
read_ascii 2 <<-EOF
|
||
${c2} ___________
|
||
${c2}|_ \\
|
||
${c2} | ${c7}| _____ ${c2}|
|
||
${c2} | ${c7}| | | | ${c2}|
|
||
${c2} | ${c7}| | | | ${c2}|
|
||
${c2} | ${c7}\\__${c7}___/ ${c2}|
|
||
${c2} \\_________/
|
||
EOF
|
||
;;
|
||
|
||
|
||
[Ll]inux*)
|
||
read_ascii 4 <<-EOF
|
||
${c4} ___
|
||
(${c7}.· ${c4}|
|
||
(${c5}<> ${c4}|
|
||
/ ${c7}__ ${c4}\\
|
||
( ${c7}/ \\ ${c4}/|
|
||
${c5}_${c4}/\\ ${c7}__)${c4}/${c5}_${c4})
|
||
${c5}\/${c4}-____${c5}\/
|
||
EOF
|
||
;;
|
||
|
||
[Mm]ac[Oo][Ss]*|[Dd]arwin*)
|
||
read_ascii 1 <<-EOF
|
||
${c1} .:'
|
||
_ :'_
|
||
${c2} .'\`_\`-'_\`\`.
|
||
:________.-'
|
||
${c3}:_______:
|
||
${c4} :_______\`-;
|
||
${c5} \`._.-._.'
|
||
EOF
|
||
;;
|
||
|
||
[Mm]ageia*)
|
||
read_ascii 2 <<-EOF
|
||
${c6} *
|
||
*
|
||
**
|
||
${c7} /\\__/\\
|
||
/ \\
|
||
\\ /
|
||
\\____/
|
||
EOF
|
||
;;
|
||
|
||
[Mm]anjaro*)
|
||
read_ascii 2 <<-EOF
|
||
${c2}||||||||| ||||
|
||
||||||||| ||||
|
||
|||| ||||
|
||
|||| |||| ||||
|
||
|||| |||| ||||
|
||
|||| |||| ||||
|
||
|||| |||| ||||
|
||
EOF
|
||
;;
|
||
|
||
[Mm][Xx]*)
|
||
read_ascii <<-EOF
|
||
${c7} \\\\ /
|
||
\\\\/
|
||
\\\\
|
||
/\\/ \\\\
|
||
/ \\ /\\
|
||
/ \\/ \\
|
||
/__________\\
|
||
EOF
|
||
;;
|
||
|
||
[Nn]et[Bb][Ss][Dd]*)
|
||
read_ascii 3 <<-EOF
|
||
${c7}\\\\${c3}\`-______,----__
|
||
${c7} \\\\ ${c3}__,---\`_
|
||
${c7} \\\\ ${c3}\`.____
|
||
${c7} \\\\${c3}-______,----\`-
|
||
${c7} \\\\
|
||
\\\\
|
||
\\\\
|
||
EOF
|
||
;;
|
||
|
||
[Nn]ix[Oo][Ss]*)
|
||
read_ascii 4 <<-EOF
|
||
${c4} \\\\ \\\\ //
|
||
==\\\\__\\\\/ //
|
||
// \\\\//
|
||
==// //==
|
||
//\\\\___//
|
||
// /\\\\ \\\\==
|
||
// \\\\ \\\\
|
||
EOF
|
||
;;
|
||
|
||
[Oo]pen[Bb][Ss][Dd]*)
|
||
read_ascii 3 <<-EOF
|
||
${c3} _____
|
||
\\- -/
|
||
\\_/ \\
|
||
| ${c7}O O${c3} |
|
||
|_ < ) 3 )
|
||
/ \\ /
|
||
/-_____-\\
|
||
EOF
|
||
;;
|
||
|
||
openSUSE*|open*SUSE*|SUSE*|suse*)
|
||
read_ascii 2 <<-EOF
|
||
${c2} _______
|
||
__| __ \\
|
||
/ .\\ \\
|
||
\\__/ |
|
||
_______|
|
||
\\_______
|
||
__________/
|
||
EOF
|
||
;;
|
||
|
||
[Pp]arabola*)
|
||
read_ascii 5 <<-EOF
|
||
${c5} __ __ __ _
|
||
.\`_//_//_/ / \`.
|
||
/ .\`
|
||
/ .\`
|
||
/.\`
|
||
/\`
|
||
EOF
|
||
;;
|
||
|
||
[Pp]op!_[Oo][Ss]*)
|
||
read_ascii 6 <<-EOF
|
||
${c6}______
|
||
\\ _ \\ __
|
||
\\ \\ \\ \\ / /
|
||
\\ \\_\\ \\ / /
|
||
\\ ___\\ /_/
|
||
\\ \\ _
|
||
__\\_\\__(_)_
|
||
(___________)
|
||
EOF
|
||
;;
|
||
|
||
[Pp]ure[Oo][Ss]*)
|
||
read_ascii <<-EOF
|
||
${c7} _____________
|
||
| _________ |
|
||
| | | |
|
||
| | | |
|
||
| |_________| |
|
||
|_____________|
|
||
EOF
|
||
;;
|
||
|
||
[Ss]lackware*)
|
||
read_ascii 4 <<-EOF
|
||
${c4} ________
|
||
/ ______|
|
||
| |______
|
||
\\______ \\
|
||
______| |
|
||
| |________/
|
||
|____________
|
||
EOF
|
||
;;
|
||
|
||
[Vv]oid*)
|
||
read_ascii 2 <<-EOF
|
||
${c2} _______
|
||
_ \\______ -
|
||
| \\ ___ \\ |
|
||
| | / \ | |
|
||
| | \___/ | |
|
||
| \\______ \\_|
|
||
-_______\\
|
||
EOF
|
||
;;
|
||
|
||
*)
|
||
# On no match of a distribution ascii art, this function calls
|
||
# itself again, this time to look for a more generic OS related
|
||
# ascii art (KISS Linux -> Linux).
|
||
[ "$1" ] || {
|
||
get_ascii "$os"
|
||
return
|
||
}
|
||
|
||
printf 'error: %s is not currently supported.\n' "$os" >&6
|
||
printf 'error: Open an issue for support to be added.\n' >&6
|
||
exit 1
|
||
;;
|
||
esac
|
||
|
||
# Store the "width" (longest line) and "height" (number of lines)
|
||
# of the ascii art for positioning. This script prints to the screen
|
||
# *almost* like a TUI does. It uses escape sequences to allow dynamic
|
||
# printing of the information through user configuration.
|
||
#
|
||
# Iterate over each line of the ascii art to retrieve the above
|
||
# information. The 'sed' is used to strip '[3Xm' color codes from
|
||
# the ascii art so they don't affect the width variable.
|
||
#
|
||
# The " " acts as the padding between the ascii art and the text as
|
||
# it appends 3 spaces to the end of each line.
|
||
while read -r line; do
|
||
ascii_height=$((ascii_height + 1))
|
||
ascii_width=$((${#line} > ascii_width ? ${#line} : ascii_width))
|
||
|
||
# Using '<<-EOF' is the only way to loop over a command's
|
||
# output without the use of a pipe ('|') or subshell.
|
||
# This ensures that any variables defined in the while loop
|
||
# are still accessible in the script.
|
||
done <<-EOF
|
||
$(printf %s "$ascii" | sed 's/\[3.m//g')
|
||
EOF
|
||
|
||
# Add a gap between the ascii art and the information.
|
||
: $((ascii_width+=4))
|
||
|
||
# Print the ascii art and position the cursor back where we
|
||
# started prior to printing it.
|
||
# '[?7l': Disable line-wrapping.
|
||
# '[?25l': Hide the cursor.
|
||
# '[1m': Print the ascii in bold.
|
||
# '[m': Clear bold.
|
||
# '[%sA': Move the cursor up '$ascii_height' amount of lines.
|
||
printf '[?7l[?25l[1m%s[m[%sA' "$ascii" "$ascii_height" >&6
|
||
}
|
||
|
||
main() {
|
||
# Leave the terminal how we found it on exit or Ctrl+C.
|
||
# '[?7h': Enable line-wrapping.
|
||
# '[?25h': Un-hide the cursor.
|
||
trap 'printf [?7h[?25h >&6' EXIT
|
||
|
||
# Hide 'stderr' unless the first argument is '-v'. This saves
|
||
# polluting the script with '2>/dev/null'.
|
||
[ "$1" = -v ] || exec 2>/dev/null
|
||
|
||
# Hide 'stdout' and selectively print to it using '>&6'.
|
||
# This gives full control over what it displayed on the screen.
|
||
exec 6>&1 >/dev/null
|
||
|
||
# Generic color list.
|
||
# Disable warning about unused variables.
|
||
# shellcheck disable=2034
|
||
{
|
||
c1='[31m'; c2='[32m'
|
||
c3='[33m'; c4='[34m'
|
||
c5='[35m'; c6='[36m'
|
||
c7='[37m'; c8='[38m'
|
||
}
|
||
|
||
# Store the output of 'uname' to avoid calling it multiple times
|
||
# throughout the script. 'read <<EOF' is the simplest way of reading
|
||
# a command into a list of variables.
|
||
read -r os kernel <<-EOF
|
||
$(uname -sr)
|
||
EOF
|
||
|
||
# Always run 'get_os' for the purposes of detecting which ascii
|
||
# art to display.
|
||
get_os
|
||
|
||
# Allow the user to specify the order and inclusion of information
|
||
# functions through the 'PF_INFO' environment variable.
|
||
# shellcheck disable=2086
|
||
{
|
||
# Disable globbing and set the positional parameters to the
|
||
# contents of 'PF_INFO'.
|
||
set -f
|
||
set +f ${PF_INFO-ascii title os host kernel uptime pkgs memory}
|
||
|
||
# Iterate over the info functions to determine the lengths of the
|
||
# "info names" for output alignment. The option names and subtitles
|
||
# match 1:1 so this is thankfully simple.
|
||
for info; do
|
||
command -v "get_$info" >/dev/null &&
|
||
info_length=$((${#info} > info_length ? ${#info} : info_length))
|
||
done
|
||
|
||
# Add an additional space of length to act as a gap.
|
||
: $((info_length+=1))
|
||
|
||
# Iterate over the above list and run any existing "get_" functions.
|
||
for info; do "get_$info"; done
|
||
}
|
||
|
||
# Position the cursor below both the ascii art and information lines
|
||
# according to the height of both. If the information exceeds the ascii
|
||
# art in height, don't touch the cursor, else move it down N lines.
|
||
cursor_pos=$((info_height > ascii_height ? 0 : ascii_height - info_height))
|
||
|
||
# Print '$cursor_pos' amount of newlines. Using cursor down doesn't scroll
|
||
# the screen correctly if this causes the cursor to hit the bottom of the
|
||
# window. Using '0' gives us an extra iteration, adding a bottom line gap.
|
||
printf '%0.s\n' $(seq 0 "$cursor_pos") >&6
|
||
}
|
||
|
||
main "$@"
|