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@mafredri
Last active December 21, 2021 18:36
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Custom tabulation command for zsh-histdb
# This is a custom tabulation command implemented fully in zsh that
# produces simple output suitable for zsh-histdb.
#
# The `column` command on macOS has a silly limitation max 2048 line
# length, it's unsuitable for tabulating long paths and commands. It
# also produces somewhat unexpected results with regards to column
# length and placement.
#
# Features:
# - Right indent for number columns
# - Give at least 2/3 of terminal width to command output unless all
# lines fit within $COLUMNS of the terminal
#
# Potential future improvements:
# - Colorize output
#
# Author: Mathias Fredriksson (github.com/mafredri)
# License: MIT
_histdb_tabulate_cmd() {
local -a col cols collen header
local line
integer len
read -r line
col=("${(@ps.\x1f.)line}")
for (( i=1; i <= ${#col}; i++ )); do
len=${#${col[$i]}}
collen[$i]=$len
done
header=("${(@)col}")
cols=("${(@)header}")
while read -r line; do
col=("${(@ps.\x1f.)line}")
for (( i = 1; i <= $#col; i++ )); do
len=${#${col[$i]}}
if (( len > collen[$i] )); then
collen[$i]=$len
fi
done
cols+=("${(@)col}")
done
local pattern
integer i colsize_precmd empty_colsize
for ((i = 1; i < $#header; i++)); do
if [[ $header[i] != cmds ]]; then
colsize_precmd+=$(( $collen[$i] + 1 ))
fi
if ((i <= $#header - 2)); then
empty_colsize+=$(($collen[$i] + 1))
fi
done
local split_cmd=0
if ((colsize_precmd + $collen[-1] > COLUMNS)) && ((colsize_precmd > COLUMNS / 3)); then
split_cmd=1
fi
for ((i = 1; i < $#header; i++)); do
case "$header[$i]" in
ses|\?|secs)
# Right aligned column.
pattern+="%${collen[$i]}s "
;;
*)
# Left aligned column, avoid padding the
# last column before line split.
if ((split_cmd)) && ((i == $#header-1)); then
pattern+="%-s"
else
pattern+="%-${collen[$i]}s "
fi
;;
esac
done
# Always give at least half the terminal to commands by
# splitting the column on two lines and aligning to the
# middle.
if ((split_cmd)); then
pattern+="\n$(printf ' %.0s' {1..$((COLUMNS / 3))})%s\n\n"
else
pattern+=" %s\n"
fi
# Print and remove empty lines in case cmds
# was moved to new line.
printf "$pattern" "${(@)cols}" \
| grep -v "^$" \
| grep -v "^$(printf ' %.0s' {1..$empty_colsize})\$" \
| grep -v "^$(printf ' %.0s' {1..$colsize_precmd})\$"
}
HISTDB_TABULATE_CMD=(_histdb_tabulate_cmd)
@jaspermayone
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Do I just source this in my .zshrc??

@mafredri
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Author

@j-dogcoder sure, that should work fine. You can do it right after sourcing zsh-histdb, something like this:

source $ZSH/modules/zsh-histdb/sqlite-history.zsh
source zsh-histdb-tabulation.zsh

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