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#!/bin/bash -e
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set -o errexit pipefail # errexit in case caller did not have -e in #! line
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if test ! "$_util_sh_include_guard_utils"; then
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_util_sh_include_guard_utils=1
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isset() { test "${!1+isset}"; }
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realpath() { readlink -f -- "$1"; }
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str2varname() { echo "${1//[^a-zA-Z0-9_]/_}"; }
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include_guard_var() { str2varname "$(realpath "$1")"; }
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self_not_included() # usage: if self_not_included; then ... fi
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{
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	test $# -ge 1 || set -- "${BASH_SOURCE[1]}"
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	local include_guard="$(include_guard_var "$1")"
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	alias self_being_included=false
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	! isset "$include_guard" && \
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	{ eval "$include_guard"=1; alias self_being_included=true; }
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}
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# to load newly-defined aliases for use in functions in the same file:
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## fi # load new aliases
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## if self_being_included; then
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# this is needed because aliases defined inside an if statement are not
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# available inside that if statement
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fi
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if self_not_included "${BASH_SOURCE[0]}"; then
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#### options
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shopt -s expand_aliases
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#### vars
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set_var() { eval "$1"'="$2"'; }
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set_inv() { set_var no_"$1" "$(test "${!1}" || echo 1)"; }
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# usage: local var=...; local_inv
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alias local_inv='declare "no_$var=$(test "${!var}" || echo 1)"'
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unexport() { export -n "$@"; }
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	# `declare +x` won't work because it defines the var if it isn't set
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alias local_export='declare -x' # combines effects of local and export
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get_prefix_vars() { : "${prefix:?}"; eval echo '${!'$prefix'*}'; }
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# usage: local prefix=..._; import_vars
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# when used inside another alias 2+ levels deep, *must* be run inside a function
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alias import_vars="$(cat <<'EOF'
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: "${prefix:?}"
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declare src_var dest_var
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for src_var in $(get_prefix_vars); do
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	dest_var="${src_var#$prefix}"
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	declare "$dest_var=${!src_var}"; echo_vars "$dest_var"
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done
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EOF
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)"
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#### caching
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## shell-variable-based caching
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# usage: local cache_key=...; cache_init; \
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# if ! cached; then cache_save value; fi; echo_cached_value
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# cache_key for function inputs: "$(declare -p "$kw_param"...) $*"
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alias load_cache='declare cache_var="$(str2varname "${FUNCNAME}___$cache_key")"'
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alias cached='isset "$cache_var"'
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alias save_cache='set_var "$cache_var"'
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alias echo_cached_value='echo "${!cache_var}"'
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clear_cache() # usage: func=... clear_cache
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{ : "${func:?}"; unset $(prefix="${func}___" get_prefix_vars); }
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fi # load new aliases
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if self_being_included; then
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#### aliases
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unalias() { builtin unalias "$@" 2>&- || true; } # no error if undefined
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# usage: alias alias_='var=value run_cmd '
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function run_cmd() { "$@"; }
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alias run_cmd='"run_cmd" ' # last space alias-expands next word
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#### functions
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kw_params() # usage: func() { kw_params param_var...; }; ...; param_var=... cmd
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# removes keyword-param-only vars from the environment
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{ unexport "$@"; }
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alias self='command "$FUNCNAME"' # usage: wrapper() { self ...; }
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#### exceptions
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# usage: cmd || { save_e; ...; rethrow; }
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alias export_e='e=$?'
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alias save_e='declare e=$?'
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alias rethrow='return "$e"'
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alias rethrow_subshell='exit "$e"'
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fi # load new aliases
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if self_being_included; then
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# usage: try cmd...; ignore status; if catch status; then ...; fi; end_try
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function try() { e=0; "$@" || { export_e; true; }; }
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alias try='declare e; "try" ' # last space alias-expands next word
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catch() { test "$e" -eq "$1"; e=0; }
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ignore() { catch "$@" || true; }
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alias end_try='rethrow'
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alias end_try_subshell='rethrow_subshell'
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fi # load new aliases
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if self_being_included; then
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#### integers
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let!() { let "$@" || true; } # always returns true; safe to use for setting
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	# "If the last ARG evaluates to 0, let returns 1" (`help let`)
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bool2int() { try test ! "$1"; echo "$e"; } # empty->0; non-empty->1
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#### strings
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repeat() # usage: str=... n=... repeat
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{
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	: "${str?}" "${n:?}"; local result= n="$n" # n will be modified in function
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	for (( ; n > 0; n-- )); do result="$result$str"; done
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	echo "$result"
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}
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sed_ere_flag="$(test "$(uname)" = Darwin && echo E || echo r)"
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sed() { self -"$sed_ere_flag" "$@";}
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rtrim() { sed 's/[[:space:]]+$//' <<<"$1"; }
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#### arrays
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join() { local IFS="$delim"; echo "$*"; } # usage: delim=... join elems...
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reverse() # usage: array=($(reverse args...))
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{
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	local i
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	for (( i=$#; i > 0; i-- )); do printf '%q ' "${!i}"; done
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}
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contains() # usage: contains value in_array...
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{
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	local value="$1"; shift
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	local elem
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	for elem in "$@"; do if test "$elem" = "$value"; then return 0; fi; done
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	return 1
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}
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#### verbose output
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err_fd=2 # stderr
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usage() { echo "Usage: $1" >&2; return 2; }
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### logging
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log_fd=2 # stderr
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if test "$explicit_errors_only"; then verbosity=0; fi # hide startup logging
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# set verbosity
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if isset verbose; then : "${verbosity:=$(bool2int "$verbose")}"; fi
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if isset vb; then : "${verbosity:=$vb}"; fi
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: "${verbosity=1}" # default
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: "${verbosity:=0}" # ensure non-empty
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export verbosity # propagate to invoked commands
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# definition: the log_level is the minimum verbosity needed to display a message
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# for messages that use can_log(), the log_level starts with *1*, not 0
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# for unfiltered messages, the log_level is 0 (i.e. still output at verbosity=0)
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# to view a message's log_level, count the # of + signs before it in the output
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alias PS4_prefix_n='str="${PS4:0:1}" n=$1 repeat'
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fi # load new aliases
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if self_being_included; then
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# usage: in func:      log++; ...         OR  log_local; "log++"; ...
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#        outside func: log++; ...; log--
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#        before cmd:   log++ cmd...
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# without a cmd, "$@" expands to nothing and assignments are applied to caller
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# "${@:2}" expands to all of $@ after *1st* arg, not 2nd ($@ indexes start at 1)
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log+()  { PS4="$(PS4_prefix_n)$PS4" verbosity=$((verbosity-$1)) "${@:2}"; }
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log-()  { PS4="${PS4:$1}"           verbosity=$((verbosity+$1)) "${@:2}"; }
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log++() { log+ 1 "$@"; }
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log--() { log- 1 "$@"; }
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alias log_local='declare PS4="$PS4" verbosity="$verbosity"'
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alias log+='log_local; "log+" ' # last space alias-expands next word
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alias log-='log_local; "log-" ' # last space alias-expands next word
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alias log++='log_local; "log++" ' # last space alias-expands next word
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alias log--='log_local; "log--" ' # last space alias-expands next word
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# indent for call tree. this is *not* the log_level (below).
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: "${log_level_indent=| }" "${log_indent=}"
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export log_level_indent log_indent # propagate to invoked commands
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__caller_indent='log_indent="$log_indent$log_level_indent"'
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alias caller_indent="$__caller_indent"
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alias indent="declare $__caller_indent"
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fi # load new aliases
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if self_being_included; then
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can_log() { test "$verbosity" -gt 0; } # verbosity=0 turns off all logging
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log() { if can_log; then echo "$log_indent$PS4$1" >&"$log_fd"; fi; }
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log_custom() # usage: symbol=... log_custom msg
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{ log_indent="${log_indent//[^ ]/$symbol}" PS4="${PS4//[^ ]/$symbol}" log "$@";}
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log_err() { symbol='#' verbosity=1 log_fd="$err_fd" log_custom "$@"; }
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log_info() { symbol=: log_custom "$@"; }
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log_e() # usage: cmd || { save_e; log_e; ...; rethrow; }
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{ log_err "command exited with error $e"; }
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die() # usage: cmd || [type=...] die msg
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{ save_e; kw_params type; "log_${type:-err}" "$1"; rethrow; }
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#### functions
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func_exists() { declare -f "$1" >/dev/null; }
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copy_func() # usage: from=... to=... copy_func
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# $to must not exist. to get around the no-clobber restriction, use `unset -f`.
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{
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	: "${from:?}" "${to:?}"
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	func_exists "$from" || die "function does not exist: $from"
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	! func_exists "$to" || die "function already exists: $to"
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	local from_def="$(declare -f "$from")"
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	eval "$to${from_def#$from}"
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}
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func_override() # usage: func_override old_name__suffix
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{ from="${1%%__*}" to="$1" copy_func; }
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ensure_nested_func() # usage: func__nested_func() { ensure_nested_func; ... }
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{
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	local nested_func="${FUNCNAME[1]}"
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	local func="${nested_func%%__*}"
275
	contains "$func" "${FUNCNAME[@]}" || \
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		die "$nested_func() must be used by $func()"
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}
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#### paths
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# cache realpath
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: "${realpath_cache=}" # default off because slower than without
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if test "$realpath_cache"; then
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func_override realpath__no_cache
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realpath() # caches the last result for efficiency
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{
288
	local cache_key="$*"; load_cache
289
	if ! cached; then save_cache "$(realpath__no_cache "$@")"; fi
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	echo_cached_value
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}
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fi
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rel_path() # usage: base_dir=... path=... rel_path
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{
296
	log++; kw_params base_dir path
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	: "${base_dir:?}" "${path:?}"
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	local path="$path/" # add *extra* / to match path when exactly = base_dir
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	path="${path#$base_dir/}" # remove prefix shared with base_dir
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	path="${path%/}" # remove any remaining extra trailing /
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	if test ! "$path"; then path=.; fi # ensure non-empty
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	echo_vars path
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	echo "$path"
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}
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cd -P . # expand symlinks in $PWD so it matches the output of realpath
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# do before setting $top_script_abs so realpath has less symlinks to resolve
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canon_rel_path() { base_dir="$PWD" path="$(realpath "$1")" rel_path; }
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# makes $1 a canon_rel_path if it's a filesystem path
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alias cmd2rel_path="$(cat <<'EOF'
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if test "$(type -t "$1")" = file && test -e "$1"; then # not relative to PATH
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	declare _1="$1"; shift
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	set -- "$(canon_rel_path "$_1")" "$@"
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fi
320
EOF
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)"
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#### verbose output
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### command echoing
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alias echo_params='log "$*"'
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fi # load new aliases
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if self_being_included; then
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echo_cmd() { echo_params; }
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echo_eval() { echo_params; builtin eval "$@"; }
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## vars
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echo_vars() # usage: echo_vars var...
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{
342
	log+ 2
343
	if can_log; then
344
		local var
345
		for var in "${@%%=*}"; do
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			if isset "$var"; then log "$(declare -p "$var")"; fi
347
		done
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	fi
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}
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echo_export() { builtin export "$@"; echo_vars "$@"; }
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if test "$verbosity" -ge 2; then
354
	alias export="echo_export" # automatically echo env vars when they are set
355
fi
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func_override kw_params__lang
358
kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
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## functions
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# usage: local func=...; set_func_loc; use $file, $line
363
alias set_func_loc="$(cat <<'EOF'
364
: "${func:?}"
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local func_info="$(shopt -s extdebug; declare -F "$func")" # 'func line file'
366
func_info="${func_info#$func }"
367
local line="${func_info%% *}"
368
local file="${func_info#$line }"
369
EOF
370
)"
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372
fi # load new aliases
373
if self_being_included; then
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func_loc() # gets where function declared in the format file:line
376
{ local func="$1"; set_func_loc; echo "$(canon_rel_path "$file"):$line"; }
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# usage: func() { [minor=1] echo_func; ... }
379
function echo_func()
380
# usage: [minor=1] "echo_func" "$FUNCNAME" "$@" && indent || true
381
# exit status: whether function call was echoed
382
{
383
	kw_params minor
384
	local func="$1"; shift
385
	
386
	log++; if test "$minor"; then log++; fi
387
	echo_cmd "$(func_loc "$func")" "$func" "$@"
388
	can_log
389
}
390
alias echo_func='"echo_func" "$FUNCNAME" "$@" && indent || true'
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392
fi # load new aliases
393
if self_being_included; then
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396
#### streams
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398
fd_exists() { (: <&"$1") 2>/dev/null; }
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400
require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
401
{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
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403
set_fds() { echo_func; echo_eval exec "$@"; } # usage: set_fds redirect...
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405
fd_set_default() # usage: fd_set_default 'dest[<>]src'
406
{
407
	echo_func
408
	local dest="${1%%[<>]*}"
409
	require_fd_not_exists "$dest" || return 0
410
	set_fds "$1"
411
}
412

    
413
# convention: use fd 10/11/12 for command-specific alternate stdin/stdout/stderr
414

    
415
setup_log_fd() # view logging output at verbosity >= 5
416
{
417
	log+ 4; log-- echo_func 
418
	fd_set_default '30>&2' || true # stdlog
419
	log_fd=30 # stdlog
420
}
421
setup_log_fd
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423
set_global_fds()
424
# allows commands to access global stdin/stdout/stderr using fd 20/21/22
425
# this works even when /dev/tty isn't available
426
# view logging output at verbosity >= 3
427
{
428
	log+ 2; log-- echo_func
429
	# ignore errors if a source fd isn't open
430
	fd_set_default '20<&0' || true
431
	fd_set_default '21>&1' || true
432
	fd_set_default '22>&2' || true
433
}
434
set_global_fds
435
err_fd=22 # global stderr
436

    
437
# usage: explicit_errors_only=1 script...
438
# show only explicitly-displayed errors (which have been redirected to fd 22)
439
# most of the time this has the same effect as `verbosity=0 script...`,
440
# which displays everything that isn't explicitly hidden
441
# this option should only be used for testing the explicit error displaying
442
if test "$explicit_errors_only"; then disable_logging; fi
443

    
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445
#### paths
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447
top_script_abs="$(realpath "$0")"; echo_vars top_script_abs # outermost script
448
	# realpath this before doing any cd so this points to the right place
449

    
450
set_paths()
451
{
452
	top_script="$(canon_rel_path "$top_script_abs")"; echo_vars top_script
453
	top_dir="$(dirname "$top_script")"; echo_vars top_dir
454
}
455
set_paths
456

    
457

    
458
#### verbose output
459

    
460

    
461
## internal commands
462

    
463
.()
464
{
465
	cmd2rel_path; set -- "$FUNCNAME" "$@"
466
	(log++; echo_params; can_log) && indent || true
467
	builtin "$@"
468
}
469

    
470
cd() # indent is permanent within subshell cd was used in
471
{
472
	cmd2rel_path; echo_cmd "$FUNCNAME" "$@"
473
	can_log && caller_indent || true
474
	# -P: expand symlinks so $PWD matches the output of realpath
475
	builtin "$FUNCNAME" -P "$@"
476
	
477
	func=realpath clear_cache
478
	set_paths
479
}
480

    
481
## external commands
482

    
483
disable_logging() { set_fds "$log_fd>/dev/null"; }
484

    
485
function command() # usage: [cmd_log_fd=|1|2|#] command extern_cmd...
486
# to view only explicitly-displayed errors: explicit_errors_only=1 script...
487
{
488
	kw_params cmd_log_fd
489
	# if no cmd_log_fd, limit log_fd in case command uses util.sh
490
	local cmd_log_fd="${cmd_log_fd-$log_fd}"
491
	
492
	cmd2rel_path; (echo_params; can_log) && indent || true
493
	(
494
		# the following redirections must happen in exactly this order
495
		if test "$cmd_log_fd"; then command__set_fds; fi
496
		if test "$cmd_log_fd" != 2; then # fd 2 not used for logging
497
			exec 2>&"$err_fd" # assume fd 2 used for errors
498
		fi
499
		
500
		exec -- "$@" # -- so cmd name not treated as `exec` option
501
	) || return
502
}
503
function command__set_fds()
504
{
505
	ensure_nested_func
506
	if can_log; then
507
		if test "$cmd_log_fd" = "$log_fd"; then return 0; fi # no redir needed
508
		local src="&$log_fd"
509
	else local src=/dev/null
510
	fi
511
	set_fds "$cmd_log_fd>$src"
512
}
513

    
514
# auto-echo common external commands
515
for cmd in env rm; do alias "$cmd=command $cmd"; done; unset cmd
516

    
517

    
518
### external command input/output
519

    
520
pipe_delay() # usage: cmd1 | { pipe_delay; cmd2; }
521
{ sleep 0.1; } # s; display after leading output of cmd1
522

    
523
fi # load new aliases
524
if self_being_included; then
525

    
526
echo_stdin() # usage: input|echo_stdin|cmd
527
{
528
	log++
529
	if can_log; then
530
		pipe_delay
531
		echo ----- >&"$log_fd"
532
		tee -a /dev/fd/"$log_fd";
533
		echo ----- >&"$log_fd"
534
	else cat
535
	fi
536
}
537

    
538
echo_stdout() { echo_stdin; } # usage: cmd|echo_stdout
539

    
540

    
541
#### commands
542

    
543
require_not_exists() # usage: require_not_exists file || return 0
544
{ test ! -e "$1" || type=info die "file "$1" already exists, skipping"; }
545

    
546
function to_file() # usage: stdout=... [if_not_exists=1] to_file cmd...
547
# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
548
{
549
	echo_func; kw_params stdout
550
	: "${stdout?}"
551
	test ! "$if_not_exists" || require_not_exists "$stdout" || return 0
552
	"$@" >"$stdout" || { save_e; log_e; rm "$stdout"; rethrow; }
553
}
554
alias to_file='"to_file" ' # last space alias-expands next word
555

    
556
run_args_cmd() # runs the command line args command
557
{
558
	eval set -- "$(reverse "${BASH_ARGV[@]}")"
559
	test $# -ge 1 || set -- all
560
	echo_cmd "$top_script" "$@"; "$@"
561
}
562

    
563
fwd() # usage: subdirs=(...); fwd "$FUNCNAME" "$@"
564
{
565
	echo_func
566
	: "${subdirs?}"
567
	
568
	for subdir in "${subdirs[@]}"; do "$top_dir"/"$subdir"/run "$@"; done
569
}
570

    
571

    
572
#### URLs
573

    
574
localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
575

    
576
fi
(5-5/5)