374 lines
11 KiB
Bash
Executable File
374 lines
11 KiB
Bash
Executable File
# vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
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################################################################
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# Utility functions
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# This file holds some utility-functions for
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# the powerlevel9k-ZSH-theme
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# https://github.com/bhilburn/powerlevel9k
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################################################################
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# Exits with 0 if a variable has been previously defined (even if empty)
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# Takes the name of a variable that should be checked.
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function defined() {
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[[ ! -z "${(tP)1}" ]]
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}
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# Given the name of a variable and a default value, sets the variable
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# value to the default only if it has not been defined.
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#
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# Typeset cannot set the value for an array, so this will only work
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# for scalar values.
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function set_default() {
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local varname="$1"
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local default_value="$2"
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defined "$varname" || typeset -g "$varname"="$default_value"
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}
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# Converts large memory values into a human-readable unit (e.g., bytes --> GB)
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# Takes two arguments:
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# * $size - The number which should be prettified
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# * $base - The base of the number (default Bytes)
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printSizeHumanReadable() {
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typeset -F 2 size
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size="$1"+0.00001
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local extension
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extension=('B' 'K' 'M' 'G' 'T' 'P' 'E' 'Z' 'Y')
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local index=1
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# if the base is not Bytes
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if [[ -n $2 ]]; then
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local idx
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for idx in "${extension[@]}"; do
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if [[ "$2" == "$idx" ]]; then
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break
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fi
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index=$(( index + 1 ))
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done
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fi
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while (( (size / 1024) > 0.1 )); do
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size=$(( size / 1024 ))
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index=$(( index + 1 ))
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done
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echo "$size${extension[$index]}"
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}
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# Gets the first value out of a list of items that is not empty.
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# The items are examined by a callback-function.
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# Takes two arguments:
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# * $list - A list of items
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# * $callback - A callback function to examine if the item is
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# worthy. The callback function has access to
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# the inner variable $item.
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function getRelevantItem() {
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local -a list
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local callback
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# Explicitly split the elements by whitespace.
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list=(${=1})
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callback=$2
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for item in $list; do
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# The first non-empty item wins
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try=$(eval "$callback")
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if [[ -n "$try" ]]; then
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echo "$try"
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break;
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fi
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done
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}
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# OS detection
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case $(uname) in
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Darwin)
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OS='OSX'
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OS_ICON=$(print_icon 'APPLE_ICON')
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;;
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CYGWIN_NT-* | MSYS_NT-*)
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OS='Windows'
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OS_ICON=$(print_icon 'WINDOWS_ICON')
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;;
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FreeBSD)
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OS='BSD'
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OS_ICON=$(print_icon 'FREEBSD_ICON')
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;;
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OpenBSD)
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OS='BSD'
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OS_ICON=$(print_icon 'FREEBSD_ICON')
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;;
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DragonFly)
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OS='BSD'
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OS_ICON=$(print_icon 'FREEBSD_ICON')
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;;
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Linux)
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OS='Linux'
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os_release_id="$(grep -E '^ID=([a-zA-Z]*)' /etc/os-release | cut -d '=' -f 2)"
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case "$os_release_id" in
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*arch*)
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OS_ICON=$(print_icon 'LINUX_ARCH_ICON')
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;;
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*debian*)
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OS_ICON=$(print_icon 'LINUX_DEBIAN_ICON')
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;;
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*ubuntu*)
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OS_ICON=$(print_icon 'LINUX_UBUNTU_ICON')
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;;
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*elementary*)
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OS_ICON=$(print_icon 'LINUX_ELEMENTARY_ICON')
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;;
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*fedora*)
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OS_ICON=$(print_icon 'LINUX_FEDORA_ICON')
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;;
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*coreos*)
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OS_ICON=$(print_icon 'LINUX_COREOS_ICON')
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;;
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*gentoo*)
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OS_ICON=$(print_icon 'LINUX_GENTOO_ICON')
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;;
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*mageia*)
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OS_ICON=$(print_icon 'LINUX_MAGEIA_ICON')
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;;
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*centos*)
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OS_ICON=$(print_icon 'LINUX_CENTOS_ICON')
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;;
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*opensuse*|*tumbleweed*)
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OS_ICON=$(print_icon 'LINUX_OPENSUSE_ICON')
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;;
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*sabayon*)
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OS_ICON=$(print_icon 'LINUX_SABAYON_ICON')
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;;
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*slackware*)
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OS_ICON=$(print_icon 'LINUX_SLACKWARE_ICON')
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;;
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*linuxmint*)
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OS_ICON=$(print_icon 'LINUX_MINT_ICON')
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;;
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*alpine*)
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OS_ICON=$(print_icon 'LINUX_ALPINE_ICON')
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;;
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*aosc*)
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OS_ICON=$(print_icon 'LINUX_AOSC_ICON')
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;;
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*nixos*)
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OS_ICON=$(print_icon 'LINUX_NIXOS_ICON')
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;;
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*devuan*)
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OS_ICON=$(print_icon 'LINUX_DEVUAN_ICON')
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;;
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*manjaro*)
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OS_ICON=$(print_icon 'LINUX_MANJARO_ICON')
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;;
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*)
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OS='Linux'
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OS_ICON=$(print_icon 'LINUX_ICON')
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;;
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esac
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# Check if we're running on Android
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case $(uname -o 2>/dev/null) in
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Android)
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OS='Android'
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OS_ICON=$(print_icon 'ANDROID_ICON')
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;;
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esac
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;;
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SunOS)
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OS='Solaris'
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OS_ICON=$(print_icon 'SUNOS_ICON')
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;;
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*)
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OS=''
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OS_ICON=''
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;;
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esac
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# Determine the correct sed parameter.
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#
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# `sed` is unfortunately not consistent across OSes when it comes to flags.
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SED_EXTENDED_REGEX_PARAMETER="-r"
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if [[ "$OS" == 'OSX' ]]; then
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local IS_BSD_SED="$(sed --version &>> /dev/null || echo "BSD sed")"
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if [[ -n "$IS_BSD_SED" ]]; then
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SED_EXTENDED_REGEX_PARAMETER="-E"
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fi
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fi
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# Determine if the passed segment is used in the prompt
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#
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# Pass the name of the segment to this function to test for its presence in
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# either the LEFT or RIGHT prompt arrays.
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# * $1: The segment to be tested.
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segment_in_use() {
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local key=$1
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if [[ -n "${POWERLEVEL9K_LEFT_PROMPT_ELEMENTS[(r)$key]}" ]] || [[ -n "${POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS[(r)$key]}" ]]; then
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return 0
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else
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return 1
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fi
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}
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# Print a deprecation warning if an old segment is in use.
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# Takes the name of an associative array that contains the
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# deprecated segments as keys, the values contain the new
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# segment names.
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print_deprecation_warning() {
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typeset -AH raw_deprecated_segments
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raw_deprecated_segments=(${(kvP@)1})
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for key in ${(@k)raw_deprecated_segments}; do
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if segment_in_use $key; then
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# segment is deprecated
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print -P "%F{yellow}Warning!%f The '$key' segment is deprecated. Use '%F{blue}${raw_deprecated_segments[$key]}%f' instead. For more informations, have a look at the CHANGELOG.md."
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fi
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done
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}
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# A helper function to determine if a segment should be
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# joined or promoted to a full one.
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# Takes three arguments:
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# * $1: The array index of the current segment
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# * $2: The array index of the last printed segment
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# * $3: The array of segments of the left or right prompt
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function segmentShouldBeJoined() {
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local current_index=$1
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local last_segment_index=$2
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# Explicitly split the elements by whitespace.
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local -a elements
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elements=(${=3})
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local current_segment=${elements[$current_index]}
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local joined=false
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if [[ ${current_segment[-7,-1]} == '_joined' ]]; then
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joined=true
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# promote segment to a full one, if the predecessing full segment
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# was conditional. So this can only be the case for segments that
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# are not our direct predecessor.
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if (( $(($current_index - $last_segment_index)) > 1)); then
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# Now we have to examine every previous segment, until we reach
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# the last printed one (found by its index). This is relevant if
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# all previous segments are joined. Then we want to join our
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# segment as well.
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local examined_index=$((current_index - 1))
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while (( $examined_index > $last_segment_index )); do
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local previous_segment=${elements[$examined_index]}
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# If one of the examined segments is not joined, then we know
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# that the current segment should not be joined, as the target
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# segment is the wrong one.
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if [[ ${previous_segment[-7,-1]} != '_joined' ]]; then
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joined=false
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break
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fi
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examined_index=$((examined_index - 1))
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done
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fi
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fi
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# Return 1 means error; return 0 means no error. So we have
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# to invert $joined
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if [[ "$joined" == "true" ]]; then
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return 0
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else
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return 1
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fi
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}
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################################################################
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# Given a directory path, truncate it according to the settings.
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# Parameters:
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# * $1 Path: string - the directory path to be truncated
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# * $2 Length: integer - length to truncate to
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# * $3 Delimiter: string - the delimiter to use
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# * $4 From: string - "right" | "middle". If omited, assumes right.
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function truncatePath() {
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# if the current path is not 1 character long (e.g. "/" or "~")
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if (( ${#1} > 1 )); then
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# convert $2 from string to integer
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2=$(( $2 ))
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# set $3 to "" if not defined
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[[ -z $3 ]] && 3="" || 3=$(echo -n $3)
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# set $4 to "right" if not defined
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[[ -z $4 ]] && 4="right"
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# create a variable for the truncated path.
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local trunc_path
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# if the path is in the home folder, add "~/" to the start otherwise "/"
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[[ $1 == "~"* ]] && trunc_path='~/' || trunc_path='/'
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# split the path into an array using "/" as the delimiter
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local paths=$1
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paths=(${(s:/:)${paths//"~\/"/}})
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# declare locals for the directory being tested and its length
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local test_dir test_dir_length
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# do the needed truncation
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case $4 in
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right)
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# include the delimiter length in the threshhold
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local threshhold=$(( $2 + ${#3} ))
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# loop through the paths
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for (( i=1; i<${#paths}; i++ )); do
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# get the current directory value
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test_dir=$paths[$i]
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test_dir_length=${#test_dir}
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# only truncate if the resulting truncation will be shorter than
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# the truncation + delimiter length and at least 3 characters
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if (( $test_dir_length > $threshhold )) && (( $test_dir_length > 3 )); then
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# use the first $2 characters and the delimiter
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trunc_path+="${test_dir:0:$2}$3/"
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else
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# use the full path
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trunc_path+="${test_dir}/"
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fi
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done
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;;
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middle)
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# we need double the length for start and end truncation + delimiter length
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local threshhold=$(( $2 * 2 ))
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# create a variable for the start of the end truncation
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local last_pos
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# loop through the paths
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for (( i=1; i<${#paths}; i++ )); do
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# get the current directory value
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test_dir=$paths[$i]
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test_dir_length=${#test_dir}
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# only truncate if the resulting truncation will be shorter than
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# the truncation + delimiter length
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if (( $test_dir_length > $threshhold )); then
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# use the first $2 characters, the delimiter and the last $2 characters
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last_pos=$(( $test_dir_length - $2 ))
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trunc_path+="${test_dir:0:$2}$3${test_dir:$last_pos:$test_dir_length}/"
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else
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# use the full path
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trunc_path+="${test_dir}/"
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fi
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done
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;;
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esac
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# return the truncated path + the current directory
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echo $trunc_path${1:t}
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else # current path is 1 character long (e.g. "/" or "~")
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echo $1
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fi
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}
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# Given a directory path, truncate it according to the settings for
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# `truncate_from_right`
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function truncatePathFromRight() {
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local delim_len=${#POWERLEVEL9K_SHORTEN_DELIMITER:-1}
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echo $1 | sed $SED_EXTENDED_REGEX_PARAMETER \
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"s@(([^/]{$((POWERLEVEL9K_SHORTEN_DIR_LENGTH))})([^/]{$delim_len}))[^/]+/@\2$POWERLEVEL9K_SHORTEN_DELIMITER/@g"
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}
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# Search recursively in parent folders for given file.
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function upsearch () {
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if [[ "$PWD" == "$HOME" || "$PWD" == "/" ]]; then
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echo "$PWD"
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elif test -e "$1"; then
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pushd .. > /dev/null
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upsearch "$1"
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popd > /dev/null
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echo "$PWD"
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else
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pushd .. > /dev/null
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upsearch "$1"
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popd > /dev/null
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fi
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}
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