/usr/share/zsh/functions/Zle/insert-unicode-char is in zsh-common 5.1.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | # Make hex integers appear as 0x...
setopt localoptions cbases
integer -g _insert_unicode_ready
if [[ $LASTWIDGET = insert-unicode-char && $_insert_unicode_ready -eq 1 ]]
then
# Second call; we should have a usable prefix.
# If we don't, give up.
(( ${+NUMERIC} )) || return 1
# Convert it back to hex, padded with zeroes to 8 digits plus the 0x...
local -i 16 -Z 10 arg=$NUMERIC
# ...and use print to turn this into a Unicode character.
LBUFFER+="$(print -n "\U${arg##0x}")"
_insert_unicode_ready=0
else
# Set the base to 16...
zle argument-base 16
# ...wait for user to type hex keys then call this widget again.
zle universal-argument
_insert_unicode_ready=1
fi
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