pfetch: print without cursor movement
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Dylan Araps
parent
1045166df2
commit
c9b4d26084
135
pfetch
135
pfetch
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@ -3,59 +3,6 @@
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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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# End here if no data was found.
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[ "$2" ] || return
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@ -75,27 +22,9 @@ log() {
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info=$*
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}
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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' "${ascii_width--1}"
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align=$(printf '%*.s' "$((${#name}-info_length))" "")
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# Print the info name and color the text.
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printf '[3%s;1m%s[m' "${PF_COL1-4}" "$name"
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# Print the info name and info data separator.
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printf '%s' "$PF_SEP"
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# Move the cursor backward the length of the *current* info name and
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# then move it forwards the length of the *longest* info name. This
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# aligns each info data line.
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printf '[%sD[%sC' "${#name}" "${PF_ALIGN-$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' "${PF_COL2-7}" "$info"
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# Keep track of the number of times 'log()' has been run.
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info_height=$((${info_height:-0} + 1))
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out="[3${PF_COL1-4};1m${name}[m${PF_SEP}${align}[3${PF_COL2-7}m${info}[m"
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}
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get_title() {
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@ -112,7 +41,7 @@ get_title() {
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# shellcheck disable=SC2039
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hostname=${HOSTNAME:-${hostname:-$(hostname)}}
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log "[3${PF_COL3:-1}m${user}${c7}@[3${PF_COL3:-1}m${hostname}" " " >&6
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log "[3${PF_COL3:-1}m${user}${c7}@[3${PF_COL3:-1}m${hostname}" " "
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}
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get_os() {
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@ -123,7 +52,7 @@ get_os() {
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# On first run, this function displays _nothing_, only on the second
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# invocation is 'log()' called.
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[ "$distro" ] && {
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log os "$distro" >&6
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log os "$distro"
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return
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}
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@ -283,7 +212,7 @@ get_kernel() {
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*)
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# '$kernel' is the cached output of 'uname -r'.
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log kernel "$kernel" >&6
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log kernel "$kernel"
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;;
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esac
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}
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@ -354,7 +283,7 @@ get_host() {
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done
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# '$arch' is the cached output from 'uname -m'.
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log host "${host:-$arch}" >&6
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log host "${host:-$arch}"
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}
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get_uptime() {
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@ -409,7 +338,7 @@ get_uptime() {
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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 "${uptime:-0m}" >&6
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log uptime "${uptime:-0m}"
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}
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get_pkgs() {
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@ -509,7 +438,7 @@ get_pkgs() {
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esac | wc -l
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`
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[ "$packages" -gt 1 ] && log pkgs "$packages" >&6
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[ "$packages" -gt 1 ] && log pkgs "$packages"
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}
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get_memory() {
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@ -691,7 +620,7 @@ get_memory() {
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;;
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esac
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log memory "${mem_used:-?}M / ${mem_full:-?}M" >&6
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log memory "${mem_used:-?}M / ${mem_full:-?}M"
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}
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get_wm() {
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@ -820,7 +749,7 @@ get_wm() {
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;;
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esac
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log wm "$wm" >&6
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log wm "$wm"
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}
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@ -831,18 +760,18 @@ get_de() {
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#
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# Display the value of '$XDG_CURRENT_DESKTOP', if it's empty,
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# display the value of '$DESKTOP_SESSION'.
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log de "${XDG_CURRENT_DESKTOP:-$DESKTOP_SESSION}" >&6
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log de "${XDG_CURRENT_DESKTOP:-$DESKTOP_SESSION}"
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}
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get_shell() {
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# Display the basename of the '$SHELL' environment variable.
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log shell "${SHELL##*/}" >&6
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log shell "${SHELL##*/}"
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}
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get_editor() {
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# Display the value of '$VISUAL', if it's empty, display the
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# value of '$EDITOR'.
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log editor "${VISUAL:-$EDITOR}" >&6
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log editor "${VISUAL:-$EDITOR}"
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}
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get_palette() {
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@ -1324,8 +1253,6 @@ get_ascii() {
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# information. The 'sed' is used to strip '[3Xm' color codes from
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# the ascii art so they don't affect the width variable.
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while read -r line; do
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ascii_height=$((${ascii_height:-0} + 1))
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# This was a ternary operation but they aren't supported in
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# Minix's shell.
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[ "${#line}" -gt "${ascii_width:-0}" ] &&
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@ -1341,13 +1268,6 @@ get_ascii() {
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# Add a gap between the ascii art and the information.
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ascii_width=$((ascii_width + 4))
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# Print the ascii art and position the cursor back where we
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# started prior to printing it.
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# '[1m': Print the ascii in bold.
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# '[m': Clear bold.
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# '[%sA': Move the cursor up '$ascii_height' amount of lines.
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printf '[1m%s[m[%sA' "$ascii" "$ascii_height" >&6
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}
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main() {
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@ -1414,6 +1334,8 @@ main() {
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set -f
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set +f ${PF_INFO-ascii title os host kernel uptime pkgs memory}
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case $* in *ascii*) get_ascii; shift; esac
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# Iterate over the info functions to determine the lengths of the
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# "info names" for output alignment. The option names and subtitles
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# match 1:1 so this is thankfully simple.
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@ -1429,26 +1351,15 @@ main() {
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# Add an additional space of length to act as a gap.
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info_length=$((info_length + 1))
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# Iterate over the above list and run any existing "get_" functions.
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for info; do "get_$info"; done
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while IFS= read -r line; do
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"get_$1"
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shift "$(($# ? 1 : 0))"
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printf '%*.s%s\r%s\n' "$ascii_width" "" "$out" "$line" >&6
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out=
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done <<-EOF
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$ascii[m
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EOF
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}
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# Position the cursor below both the ascii art and information lines
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# according to the height of both. If the information exceeds the ascii
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# art in height, don't touch the cursor (0/unset), else move it down
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# N lines.
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#
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# This was a ternary operation but they aren't supported in Minix's shell.
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[ "${info_height:-0}" -lt "${ascii_height:-0}" ] &&
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cursor_pos=$((ascii_height - info_height))
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# Print '$cursor_pos' amount of newlines to correctly position the
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# cursor. This used to be a 'printf $(seq X X)' however 'seq' is only
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# typically available (by default) on GNU based systems!
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while [ "${i:=0}" -le "${cursor_pos:-0}" ]; do
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printf '\n'
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i=$((i + 1))
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done >&6
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}
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main "$@"
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