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#!/bin/bash

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#

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# Utility functions

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### Command execution

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## Execute command, possibly logging its execution.

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#

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#   cmd     $cmd...

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#

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# Fails if the command returns an error exit code.

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function cmd {

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    log_cmd "$@"

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    "$@" || die "Failed: $@"

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}

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## Execute command as a test, logging its execution at log_cmd

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#

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#   cmd_test $cmd... && ... || ...

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#

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# Fails if the command returns an error exit code.

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function cmd_test {

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    log_cmd "$@"

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    "$@"

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}

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## Execute command, prefixing its output on stdout with given indent prefix.

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#

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#   indent  "    " $cmd...

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#

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# Output is kept on stdout, exit status is that of the given command.

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function indent () {

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    local indent="$1"; shift

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    "$@" | sed "s/^/$indent/"

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    return ${PIPESTATUS[0]}

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}

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### FS utils

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# Create dir if not exists.

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function ensure_dir {

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    local dir="$1"

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    if [ ! -d "$dir" ]; then

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        log_warn "Creating output dir: $dir"

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        cmd mkdir "$dir"

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    fi

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}

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## Output absolute path

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#

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#   abspath $path

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#

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# XXX: improve...?

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function abspath () {

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    local path="$1"

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    echo "$SRV/$path"

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}

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## List names of files in dir:

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#

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#   list_files $dir $glob

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#

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function list_files {

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    local dir="$1"

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    local glob="${2:-*}"

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    local name=

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    for file in $dir/$glob; do

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        # only files

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        [ -f "$file" ] || continue

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        # strip prefix

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        name=${file#$dir/}

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        name=${name%$glob}

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        echo -n "$name "

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    done

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}

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## List names of dirs in dir:

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function list_dirs {

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    local dir="$1"

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    for file in $dir/*; do

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        [ -d "$file" ] || continue

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        echo -n "${file#$dir/} "

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    done

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}

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## Get current unix (utc) timestamp

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function unix_time {

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    date +'%s'

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}