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#!/bin/bash -e
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set -o 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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include_guard_var() { realpath "$1"|builtin command sed 's/[^a-zA-Z0-9_]/_/g'; }
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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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#### 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 n="$n" # will be modified in function
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	for (( ; n > 0; n-- )); do printf '%q' "$str"; done
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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=2}" # default
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: "${verbosity:=0}" # ensure non-empty
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export verbosity # propagate to invoked commands
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: "${log_level_indent=| }" "${log_indent=}"
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export log_level_indent log_indent # propagate to invoked commands
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alias indent='declare log_indent="$log_indent$log_level_indent"'
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# usage: in func:      PS4++; ...
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#        outside func: PS4++; ...; PS4--
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alias PS4++='declare PS4="${PS4:0:1}$PS4"'
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alias PS4--='declare PS4="${PS4#${PS4:0:1}}"'
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# usage: in func:      log++; ...
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#        outside func: log++; ...; log--
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alias log++='{ PS4++; declare verbosity="$verbosity"; let! verbosity--; }'
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alias log--='{ PS4--; declare verbosity="$verbosity"; let! verbosity++; }'
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fi # load new aliases
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if self_being_included; then
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can_log() { test "$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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# usage: symbol=... log_custom msg
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log_custom()
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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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# usage: cmd || { save_e; log_e; ...; rethrow; }
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log_e() { log_err "command exited with error $e"; }
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# usage: cmd || [type=...] die msg
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die() { save_e; kw_params type; "log_${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="${nested_func%%__*}"
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	contains "$func" "${FUNCNAME[@]}" || \
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		die "$nested_func() must be used by $func()"
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}
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#### paths
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rel_path() # usage: base_dir=... path=... rel_path
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{
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	log++; kw_params base_dir path
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	: "${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 "$path"
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}
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canon_rel_path() { base_dir="$(pwd -P)" 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
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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 "$*"'
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fi # load new aliases
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if self_being_included; then
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echo_cmd() { echo_params; }
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## internal commands
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.()
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{
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	cmd2rel_path; set -- . "$@"; (log++; echo_params; can_log) && indent || true
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	builtin "$@"
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}
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echo_eval() { echo_params; builtin eval "$@"; }
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## external commands
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disable_logging() { echo_eval exec "$log_fd>/dev/null"; }
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function command() # usage: [cmd_log_fd=|1|2|#] command extern_cmd...
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# to view only explicitly-displayed errors: explicit_errors_only=1 script...
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{
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	kw_params cmd_log_fd
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	cmd2rel_path; (echo_params; can_log) && indent || true
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	(
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		# the following redirections must happen in exactly this order
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		if test "$cmd_log_fd"; then
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			echo_eval exec "$cmd_log_fd>$(if (log++; can_log); then \
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			echo "&$log_fd"; else echo /dev/null; fi)"
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		fi
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		if test "$cmd_log_fd" != 2; then # fd 2 not used for logging
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			exec 2>&"$err_fd" # assume fd 2 used for errors
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		fi
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		exec -- "$@" # -- so cmd name not treated as `exec` option
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	) || return
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}
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# auto-echo common external commands
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for cmd in env rm; do alias "$cmd=command $cmd"; done; unset cmd
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## functions
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# usage: func() { [minor=1] echo_func; ... }
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function echo_func() # usage: [minor=1] "echo_func" "$@" && indent || true
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# exit status: whether function call was echoed
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{
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	kw_params minor
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	log++; if test "$minor"; then log++; fi
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	local script="$(canon_rel_path "${BASH_SOURCE[1]}")"
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	echo_cmd "$script:${BASH_LINENO[0]}" "${FUNCNAME[1]}" "$@"
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	can_log
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}
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alias echo_func='"echo_func" "$@" && indent || true'
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## vars
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echo_vars() # usage: echo_vars var...
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{
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	log++; log++
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	if can_log; then
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		local var
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		for var in "${@%%=*}"; do
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			if isset "$var"; then log "$(declare -p "$var")"; fi
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		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 "$verbosity" -ge 2; then
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	alias export="echo_export" # automatically echo env vars when they are set
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fi
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func_override kw_params__lang
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kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
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### external command input/output
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# usage: cmd1 | { pipe_delay; cmd2; }
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pipe_delay () { sleep 0.1; } # s; display after leading output of cmd1
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fi # load new aliases
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if self_being_included; then
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echo_stdin() # usage: input|echo_stdin|cmd
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{
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	log++
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	if can_log; then
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		pipe_delay
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		echo ----- >&"$log_fd"
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		tee -a /dev/fd/"$log_fd";
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		echo ----- >&"$log_fd"
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	else cat
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	fi
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}
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echo_stdout () { echo_stdin; } # usage: cmd|echo_stdout
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fi # load new aliases
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if self_being_included; then
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#### streams
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fd_exists() { (: <&"$1") 2>/dev/null; }
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require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
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{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
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set_fd() # usage: dest=fd dir='[<>]' src=fd [noclobber=1] set_fd
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{
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	echo_func; kw_params dest dir src
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	: "${dest:?}" "${dir:?}" "${src:?}"
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	test ! "$noclobber" || require_fd_not_exists "$dest" || return 0
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	echo_eval exec "$dest$dir&$src"
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}
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shadow_fd() { noclobber=1 set_fd; } # usage: dest=fd src=fd dir='[<>]' shadow_fd
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# convention: use fd 10/11/12 for command-specific alternate stdin/stdout/stderr
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set_global_fds()
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# allows commands to access global stdin/stdout/stderr using fd 20/21/22
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# this works even when /dev/tty isn't available
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{
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	log++; echo_func; log++
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	# ignore errors if a source fd isn't open
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	dest=20 src=0 dir='<' shadow_fd || true
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	dest=21 src=1 dir='>' shadow_fd || true
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	dest=22 src=2 dir='>' shadow_fd || true
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}
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set_global_fds
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err_fd=22 # global stderr
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# usage: explicit_errors_only=1 script...
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# show only explicitly-displayed errors (which have been redirected to fd 22)
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# most of the time this has the same effect as `verbosity=0 script...`,
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# which displays everything that isn't explicitly hidden
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# this option should only be used for testing the explicit error displaying
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if test "$explicit_errors_only"; then disable_logging; fi
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#### commands
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top_script="$(canon_rel_path "$0")"; echo_vars top_script # outermost script
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top_dir="$(dirname "$top_script")"; echo_vars top_dir
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require_not_exists() # usage: require_not_exists file || return 0
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{ test ! -e "$1" || type=info die "file "$1" already exists, skipping"; }
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# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
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function to_file() # usage: stdout=... [if_not_exists=1] to_file cmd...
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{
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	echo_func; kw_params stdout
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	: "${stdout?}"
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	test ! "$if_not_exists" || require_not_exists "$stdout" || return 0
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	"$@" >"$stdout" || { save_e; log_e; rm "$stdout"; rethrow; }
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}
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alias to_file='"to_file" ' # last space alias-expands next word
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run_args_cmd() # runs the command line args command
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{
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	test $? -eq 0 || return
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	eval set -- "$(reverse "${BASH_ARGV[@]}")"
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	test $# -ge 1 || set -- all
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	echo_cmd "$top_script" "$@"; "$@"
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}
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fwd() # usage: subdirs=(...); fwd "$FUNCNAME" "$@"
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{
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	echo_func
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	: "${subdirs?}"
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	for subdir in "${subdirs[@]}"; do
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		"$(dirname "${BASH_SOURCE[1]}")"/"$subdir"/run "$@"
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	done
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}
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#### URLs
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localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
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fi
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