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Re: zsh generates invalid UTF-8 encoding in the history
On Oct 7, 10:57am, Vincent Lefevre wrote:
} Subject: Re: zsh generates invalid UTF-8 encoding in the history
}
} Thanks. Note that it is not clear in the man page whether the
} least recent starts at 0 or at 1. And when -r is used, whether
} one should use <most recent> <least recent> or the reverse.
Indeed, the use of "first last" in the doc is a bit confusing, and
so is the interpretation of the numbers by the command. It's always
most then least recent; but since negative numbers count backwards
from the most recent (largest number) and the default behavior is
described in terms of using negative offsets, it can be confusing.
} And how can one cleanly append history lines to a history file?
} I was using "cat some_file >> ~/.zhistory", which seems to work,
It'll work as long as there are no 0x83 bytes in some_file.
To be completely safe, you need to do something like this:
# Pass input file as $1, output as $2
append_plain_file_to_history_file() {
emulate -LR zsh
local -a entries
# Implementation issue: read -r ignores backslash-newline
# folding, but without -r embedded backslashes are stripped,
# which seems a bigger problem. Fix up $entries later.
IFS=$'\n' read -r -d '' -A entries <$1
(( $#entries )) || return
# Must supply a file name here to set HISTSIZE and SAVEHIST
fc -pa /dev/null $#entries $(( SAVEHIST + $#entries ))
while (( $#entries )); do
if [[ "$entries[1]" == *\\ ]]; then
entries[1,2]=( ${entries[1]%\\}$'\n'${entries[2]} )
else
print -S $entries[1]
shift 1 entries
fi
done
fc -A ${2:-$HISTFILE}
# Reset SAVEHIST to avoid attempting to lock /dev/null
SAVEHIST=0 # fc -p makes this implicitly local
}
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