#!/bin/bash

# Util to pretty-print logfile of NetworkManager
#
# Unless setting NM_LOG_NO_COLOR it will colorize the output.
# Suppress coloring with:
# $ NM_LOG_NO_COLOR=1 NM-log ...
#
# If called without arguments, it either reads from stdin (if not
# connected to a terminal) or it shows the journal content.
#
# If called with first argument "j", it always shows the journal content.
#
# You can pass multiple filenames.

if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
    NM_not_sourced=1
else
    unset NM_not_sourced
fi

NM-show-journal() {
    local since="$(systemctl show NetworkManager | sed -n 's/^ExecMainStartTimestamp=\(.*\) [A-Z0-9]\+$/\1/p')"

    if [[ "$since" == "" ]]; then
       echo "error detecting NM. Is it running?"
       systemctl status NetworkManager
    else
       journalctl -o short-precise --since "$since" -b 0 -u NetworkManager "$@"
    fi
}

NM-colorize() {
    if [[ "$NM_LOG_NO_COLOR" == "" ]]; then
        # poor man's coloring using grep.
        # TODO: do it somehow better (and more efficient).
        sed 's/\r$//' | \
        GREP_COLOR='01;31' grep -a --color=always '^\|^\(.* \)\?<\(warn> \|error>\) \[[0-9.]*\]' | \
        GREP_COLOR='01;33' grep -a --color=always '^\|^\(.* \)\?<info>  \[[0-9.]*\]\( .*\<is starting\>.*$\)\?' | \
        GREP_COLOR='01;37' grep -a --color=always '^\|\<platform:\( (.*)\)\? signal: .*$' | \
        GREP_COLOR='01;34' grep -a --color=always '^\|\<platform\(-linux\)\?:\( (.*)\)\? link: \(add\|adding\|change\|setting\|deleting\)\>\|\<platform: routing-rule: \(adding or updating:\|delete \)\|\<platform:\( (.*)\)\? address: \(deleting\|adding or updating\) IPv. address:\? \|\<platform:\( (.*)\)\? \(route\|ip4-route\|ip6-route\|qdisc\|tfilter\): \([a-z]\+\|adding or updating\|new\[0x[0-9A-Za-z]*\]\) \|\<platform-linux: sysctl: setting ' | \
        GREP_COLOR='01;35' grep -a --color=always '^\|\<audit: .*$' | \
        GREP_COLOR='01;32' grep -a --color=always '^\|\<device (.*): state change: ' |
        if [[ "$NM_LOG_GREP" != "" ]]; then
            GREP_COLOR='01;36' grep -a --color=always "^\\|$NM_LOG_GREP"
        else
            /usr/bin/cat -
        fi
    else
        /usr/bin/cat -
    fi
}

NM-log() {
    local NM_LOG_GREP=

    while [[ $# -gt 0 ]]; do
        if [[ "$1" == "-h" ]]; then
            shift
            NM_LOG_GREP="${NM_LOG_GREP+$NM_LOG_GREP\\|}\\<$1\\>"
            shift
        else
            break
        fi
    done

    (
        if [ "$1" == "j" ]; then
            shift
            NM-show-journal "$@"
        elif [ "$#" -eq 0 -a -t 0 ]; then
            NM-show-journal
        else
            a="${1--}"
            shift
            /usr/bin/less "$a" "$@"
        fi
    ) | \
        NM_LOG_GREP="$NM_LOG_GREP" NM-colorize | \
        LESS=FRSXM less -R --shift=5
}

if [[ "$NM_not_sourced" != "" ]]; then
    NM-log "$@"
fi