lit 'lit=log.md' 'file=log'
Log in this format:
$date_s $0 $msg
Optionally execute command, and log output of command.
log: set -eu
log:error: set -o pipefail
Find all initial parameters with assignments, and add them to the environment (cf [[argenv]]).
log: for arg in "$@"; do
log: if echo "$arg" | grep '=' >/dev/null 2>&1; then
log: arg_name=$(echo $arg | sed 's =.* ')
log: arg_value=$(echo $arg | sed 's ^[^=]*= ')
log: eval ${arg_name}='${arg_value}'
log: shift
log: else
log: break
log: fi
log: done
If the assignment parameters were stopped with --, then shift that out of the way. We might want to use the remaining assignments as pass-through parameters. (cf [[argenv]])
log: if test $# -gt 0; then
log: if test "$1" = "--"; then
log: shift
log: fi
log: fi
Determine how we are being called. This relies on the [[literate/header.md]] exporting $self and $selfdir.
log: selfdir=${selfdir:-.}
log: calldir=${calldir:-$selfdir}
log: self=${self:-sh}
log: caller=${caller:-$self}
log: logfile=${logfile-}
Log to a file if a path is given, otherwise log to [[standard error]].
log: if test -n "$logfile"; then
log: echo "$(date +%Y%m%d.%H%M%S) ${calldir}/${caller} $@" >>$logfile
log: else
log: echo "$(date +%Y%m%d.%H%M%S) ${calldir}/${caller} $@" >&2
log: fi
Execute the command if requested (exec=true).
log: exec=${exec:-false}
log: if $exec; then
log: tmp=${tmp:-/tmp/${self}.$$}
Log output of the command if separately asked (out=true).
log: out=${out:-false}
log: if $out; then
log: "$@" >${tmp}.out 2>&1
log: if test -n "$logfile"; then
log: cat ${tmp}.out | sed "s,^,$(date +%Y%m%d.%H%M%S) ${calldir}/${caller} ${1}: ,g" >>$logfile
log: else
log: cat ${tmp}.out
log: fi
log: else
log: "$@"
log: fi
log: fi