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# vim:ft=zsh ts=2 sw=2 sts=2 et fenc=utf-8
################################################################
# Utility functions
# This file holds some utility-functions for
# the powerlevel9k-ZSH-theme
# https://github.com/bhilburn/powerlevel9k
################################################################
# Exits with 0 if a variable has been previously defined (even if empty)
# Takes the name of a variable that should be checked.
function defined() {
local varname="$1"
typeset -p "$varname" > /dev/null 2>&1
}
# Given the name of a variable and a default value, sets the variable
# value to the default only if it has not been defined.
#
# Typeset cannot set the value for an array, so this will only work
# for scalar values.
function set_default() {
local varname="$1"
local default_value="$2"
defined "$varname" || typeset -g "$varname"="$default_value"
}
# Converts large memory values into a human-readable unit (e.g., bytes --> GB)
# Takes two arguments:
# * $size - The number which should be prettified
# * $base - The base of the number (default Bytes)
printSizeHumanReadable() {
typeset -F 2 size
size="$1"+0.00001
local extension
extension=('B' 'K' 'M' 'G' 'T' 'P' 'E' 'Z' 'Y')
local index=1
# if the base is not Bytes
if [[ -n $2 ]]; then
for idx in "${extension[@]}"; do
if [[ "$2" == "$idx" ]]; then
break
fi
index=$(( index + 1 ))
done
fi
while (( (size / 1024) > 0.1 )); do
size=$(( size / 1024 ))
index=$(( index + 1 ))
done
echo "$size${extension[$index]}"
}
# Gets the first value out of a list of items that is not empty.
# The items are examined by a callback-function.
# Takes two arguments:
# * $list - A list of items
# * $callback - A callback function to examine if the item is
# worthy. The callback function has access to
# the inner variable $item.
function getRelevantItem() {
local -a list
local callback
# Explicitly split the elements by whitespace.
list=(${=1})
callback=$2
for item in $list; do
# The first non-empty item wins
try=$(eval "$callback")
if [[ -n "$try" ]]; then
echo "$try"
break;
fi
done
}
# OS detection for the `os_icon` segment
case $(uname) in
Darwin)
OS='OSX'
OS_ICON=$(print_icon 'APPLE_ICON')
;;
FreeBSD)
OS='BSD'
OS_ICON=$(print_icon 'FREEBSD_ICON')
;;
OpenBSD)
OS='BSD'
OS_ICON=$(print_icon 'FREEBSD_ICON')
;;
DragonFly)
OS='BSD'
OS_ICON=$(print_icon 'FREEBSD_ICON')
;;
Linux)
OS='Linux'
OS_ICON=$(print_icon 'LINUX_ICON')
;;
SunOS)
OS='Solaris'
OS_ICON=$(print_icon 'SUNOS_ICON')
;;
*)
OS=''
OS_ICON=''
;;
esac
# Determine the correct sed parameter.
#
# `sed` is unfortunately not consistent across OSes when it comes to flags.
SED_EXTENDED_REGEX_PARAMETER="-r"
if [[ "$OS" == 'OSX' ]]; then
local IS_BSD_SED="$(sed --version &>> /dev/null || echo "BSD sed")"
if [[ -n "$IS_BSD_SED" ]]; then
SED_EXTENDED_REGEX_PARAMETER="-E"
fi
fi
# Print a deprecation warning if an old segment is in use.
# Takes the name of an associative array that contains the
# deprecated segments as keys, the values contain the new
# segment names.
print_deprecation_warning() {
typeset -AH raw_deprecated_segments
raw_deprecated_segments=(${(kvP@)1})
for key in ${(@k)raw_deprecated_segments}; do
if [[ -n "${POWERLEVEL9K_LEFT_PROMPT_ELEMENTS[(r)$key]}" ]] || [[ -n "${POWERLEVEL9K_RIGHT_PROMPT_ELEMENTS[(r)$key]}" ]]; then
# segment is deprecated
print -P "%F{yellow}Warning!%f The '$key' segment is deprecated. Use '%F{blue}${raw_deprecated_segments[$key]}%f' instead. For more informations, have a look at the CHANGELOG.md."
fi
done
}
# A helper function to determine if a segment should be
# joined or promoted to a full one.
# Takes three arguments:
# * $1: The array index of the current segment
# * $2: The array index of the last printed segment
# * $3: The array of segments of the left or right prompt
function segmentShouldBeJoined() {
local current_index=$1
local last_segment_index=$2
# Explicitly split the elements by whitespace.
local -a elements
elements=(${=3})
local current_segment=${elements[$current_index]}
local joined=false
if [[ ${current_segment[-7,-1]} == '_joined' ]]; then
joined=true
# promote segment to a full one, if the predecessing full segment
# was conditional. So this can only be the case for segments that
# are not our direct predecessor.
if (( $(($current_index - $last_segment_index)) > 1)); then
# Now we have to examine every previous segment, until we reach
# the last printed one (found by its index). This is relevant if
# all previous segments are joined. Then we want to join our
# segment as well.
local examined_index=$((current_index - 1))
while (( $examined_index > $last_segment_index )); do
local previous_segment=${elements[$examined_index]}
# If one of the examined segments is not joined, then we know
# that the current segment should not be joined, as the target
# segment is the wrong one.
if [[ ${previous_segment[-7,-1]} != '_joined' ]]; then
joined=false
break
fi
examined_index=$((examined_index - 1))
done
fi
fi
# Return 1 means error; return 0 means no error. So we have
# to invert $joined
if [[ "$joined" == "true" ]]; then
return 0
else
return 1
fi
}
# Given a directory path, truncate it according to the settings for
# `truncate_from_right`
function truncatePathFromRight() {
echo $1 | sed $SED_EXTENDED_REGEX_PARAMETER "s/([^/]{$POWERLEVEL9K_SHORTEN_DIR_LENGTH})[^/]+\//\1$POWERLEVEL9K_SHORTEN_DELIMITER\//g"
}
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