/usr/share/zsh/functions/Zle/edit-command-line is in zsh-common 5.0.7-5.
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 | # Edit the command line using your usual editor.
# Binding this to 'v' in the vi command mode map,
# autoload -Uz edit-command-line
# zle -N edit-command-line
# bindkey -M vicmd v edit-command-line
# will give ksh-like behaviour for that key,
# except that it will handle multi-line buffers properly.
local tmpfile=${TMPPREFIX:-/tmp/zsh}ecl$$
print -R - "$PREBUFFER$BUFFER" >$tmpfile
exec </dev/tty
${=${VISUAL:-${EDITOR:-vi}}} $tmpfile
print -Rz - "$(<$tmpfile)"
command rm -f $tmpfile
zle send-break # Force reload from the buffer stack
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