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#!/bin/bash -e
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set -o errexit -o pipefail # errexit in case caller's #! line missing -e
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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_default() { if ! isset "$1"; then set_var "$@"; fi; }
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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=...; load_cache; \
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# if ! cached; then save_cache value || return; 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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alias_append() { eval $(alias "$1")'"$2"'; } # usage: alias_append alias '; cmd'
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#### functions
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kw_params() # usage: func() { kw_params param_var...; }; ...; param_var=... cmd
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# removes keyword-param-only vars from the environment
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{ unexport "$@"; }
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alias self='command "$FUNCNAME"' # usage: wrapper() { self ...; }
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alias self_sys='command -p "$FUNCNAME"' # usage: wrapper() { self_sys ...; }
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pf() { declare -f "$@"; } # usage: pf function # prints func decl for debugging
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all_funcs() # usage: for func in $(all_funcs); do ...; done # all declared funcs
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{ declare -F|while read -r line; do echo -n "${line#declare -f } "; done; }
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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_e status; if catch status; then ...; fi; end_try
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function try() { e=0; benign_error=1 "$@" || { export_e; true; }; }
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alias try='declare e; "try" ' # last space alias-expands next word
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catch() { test "$e" -eq "$1" && e=0; }
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ignore_e() { catch "$@" || true; }
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alias end_try='rethrow'
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alias end_try_subshell='rethrow_subshell'
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ignore() { save_e; ignore_e "$@"; rethrow; } # usage: try cmd || ignore status
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### signals
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sig_e() { echo $(( 128+$(kill -l "$1") )); } # usage: sig_e SIGINT, etc.
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ignore_sig() { ignore "$(sig_e "$1")"; }
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# usage: piped_cmd cmd1...|cmd2... # cmd2 doesn't read all its input
149
function piped_cmd() { "$@" || ignore_sig SIGPIPE; }
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alias piped_cmd='"piped_cmd" ' # last space alias-expands next word
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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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int2exit() { (( "$1" != 0 )); }
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exit2bool() { if (( $? == 0 )); then echo 1; fi } # 0->non-empty; !=0->empty
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#### floats
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int_part() { echo "${1%%.*}"; }
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dec_suffix() { echo "${1#$(int_part "$1")}"; }
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round_down() { int_part "$1"; }
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float+int() { echo "$(($(int_part "$1")+$2))$(dec_suffix "$1")"; }
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float_set_min() { if (($(int_part $1) >= $2)); then echo $1; else echo $2; fi; }
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#### strings
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starts_with() { test "${2#$1}" != "$2"; } # usage: starts_with pattern str
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match_prefix() # usage: match_prefix pattern str
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{ if starts_with "$1" "$2"; then echo "${2%${2#$1}}"; fi }
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repeat() # usage: str=... n=... repeat
189
{
190
	: "${str?}" "${n:?}"; local result= n="$n" # n will be modified in function
191
	for (( ; n > 0; n-- )); do result="$result$str"; done
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	echo "$result"
193
}
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sed_cmd="sed -`case "$(uname)" in Darwin) echo E;; *) echo r;; esac`"
196
alias sed="$sed_cmd"
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fi # load new aliases
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if self_being_included; then
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rtrim() { log+ 3; sed 's/[[:space:]]+$//' <<<"$1"; }
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#### arrays
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join() { local IFS="$delim"; echo "$*"; } # usage: delim=... join elems...
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reverse() # usage: array=($(reverse args...))
209
{
210
	local i
211
	for (( i=$#; i > 0; i-- )); do printf '%q ' "${!i}"; done
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}
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214
contains() # usage: contains value in_array...
215
{
216
	local value="$1"; shift
217
	local elem
218
	for elem in "$@"; do if test "$elem" = "$value"; then return 0; fi; done
219
	return 1
220
}
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#### streams
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pipe_delay() # usage: cmd1 | { pipe_delay; cmd2; }
225
{ sleep 0.1; } # s; display after leading output of cmd1
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#### verbose output
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err_fd=2 # stderr
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usage() { echo "Usage: $1" >&2; return 2; }
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### log++
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238
log_fd=2 # initially stderr
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if test "$explicit_errors_only"; then verbosity=0; fi # hide startup logging
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# set verbosity
243
if isset verbose; then : "${verbosity:=$(bool2int "$verbose")}"; fi
244
if isset vb; then : "${verbosity:=$vb}"; fi
245
: "${verbosity=1}" # default
246
: "${verbosity:=0}" # ensure non-empty
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export verbosity # propagate to invoked commands
248
export PS4 # follows verbosity, so also propagate this
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250
is_outermost="$(! isset log_level; exit2bool)" # if util.sh env not yet set up
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# set log_level
253
: "${log_level=$(( ${#PS4}-1 ))}" # defaults to # non-space symbols in PS4
254
export log_level # propagate to invoked commands
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verbosity_int() { round_down "$verbosity"; }
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# verbosities (and `make` equivalents):
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# 0: just print errors. useful for cron jobs.
260
#    vs. make: equivalent to --silent, but suppresses external command output
261
# 1: also external commands run. useful for running at the command line.
262
#    vs. make: not provided (but sorely needed to avoid excessive output)
263
# 2: full graphical call tree. useful for determining where error occurred.
264
#    vs. make: equivalent to default verbosity, but with much-needed indents
265
# 3: also values of kw params and variables. useful for low-level debugging.
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#    vs. make: not provided; need to manually use $(error $(var))
267
# 4: also variables in util.sh commands. useful for debugging util.sh.
268
#    vs. make: somewhat similar to --print-data-base
269
# 5: also variables in logging commands themselves. useful for debugging echo_*.
270
#    vs. make: not provided; need to search Makefile for @ at beginning of cmd
271
# 6+: not currently used (i.e. same as 5)
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# definition: the log_level is the minimum verbosity needed to display a message
274
# for messages that use can_log(), the log_level starts with *1*, not 0
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# for unfiltered messages, the log_level is 0 (i.e. still output at verbosity=0)
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# to view a message's log_level, count the # of + signs before it in the output
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fi # load new aliases
279
if self_being_included; then
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# usage: in func:      log++; ...         OR  log_local; "log++"; ...
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#        outside func: log++; ...; log--
283
#        before cmd:  "log++" cmd  OR  "log+" # cmd  OR  "log++" "log++" cmd
284
# with a cmd, assignments are applied just to it, so log_local is not needed
285
# without a cmd, "$@" expands to nothing and assignments are applied to caller
286
# "${@:2}" expands to all of $@ after *1st* arg, not 2nd ($@ indexes start at 1)
287
log+()
288
{
289
	# no local vars because w/o cmd, assignments should be applied to caller
290
	PS4="$(str="${PS4:0:1}" n=$((log_level+$1-1)) repeat)${PS4: -2}"; \
291
	log_level=$((log_level+$1)) \
292
	verbosity="$(float+int "$verbosity" "-$1")" "${@:2}"
293
}
294
log++() { log+  1 "$@"; }
295
log--() { log+ -1 "$@"; }
296
alias log_local=\
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'declare PS4="$PS4" log_level="$log_level" verbosity="$verbosity"'
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alias log+='log_local; "log+"' # don't expand next word because it's not a cmd
299
alias log++='log_local; "log++" ' # last space alias-expands next word
300
alias log--='log_local; "log--" ' # last space alias-expands next word
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verbosity_min() # usage: verbosity_min min
303
{ if test "$(verbosity_int)" -lt "$1"; then verbosity="$1"; fi; }
304
alias verbosity_min='log_local; "verbosity_min"'
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307
# indent for call tree. this is *not* the log_level (below).
308
: "${log_indent_step=| }" "${log_indent=}"
309
export log_indent_step log_indent # propagate to invoked commands
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311
__caller_indent='log_indent="$log_indent$log_indent_step"'
312
alias caller_indent="$__caller_indent"
313
alias indent="declare $__caller_indent"
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fi # load new aliases
317
if self_being_included; then
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can_log() { test "$(verbosity_int)" -gt 0; }
320
	# 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
325
{ log_indent="${log_indent//[^ ]/$symbol}" PS4="${PS4//[^ ]/$symbol}" log "$@";}
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log_err() { symbol='#' verbosity=1 log_fd="$err_fd" log_custom "$@"; }
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329
log_info() { symbol=: log_custom "$@"; }
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331
die() # usage: cmd || [type=...] die msg # msg can use $? but not $()
332
{ save_e; kw_params type; "log_${type:-err}" "$1"; rethrow; }
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334
die_e() # usage: cmd || [benign_error=1] die_e [|| handle error]
335
{
336
	save_e; kw_params benign_error
337
	if test "$benign_error"; then log++; fi
338
	type="${benign_error:+info}" die "command exited with \
339
$(if test "$benign_error"; then echo status; else echo error; fi) $e"
340
	rethrow
341
}
342

    
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344
#### functions
345

    
346
func_exists() { declare -f "$1" >/dev/null; }
347

    
348
copy_func() # usage: from=... to=... copy_func
349
# $to must not exist. to get around the no-clobber restriction, use `unset -f`.
350
{
351
	: "${from:?}" "${to:?}"
352
	func_exists "$from" || die "function does not exist: $from"
353
	! func_exists "$to" || die "function already exists: $to"
354
	local from_def="$(declare -f "$from")"
355
	eval "$to${from_def#$from}"
356
}
357

    
358
func_override() # usage: func_override old_name__suffix
359
{ from="${1%__*}" to="$1" copy_func; }
360

    
361
ensure_nested_func() # usage: func__nested_func() { ensure_nested_func; ... }
362
{
363
	local nested_func="${FUNCNAME[1]}"
364
	local func="${nested_func%%__*}"
365
	contains "$func" "${FUNCNAME[@]}" || \
366
		die "$nested_func() must be used by $func()"
367
}
368

    
369

    
370
#### paths
371

    
372
# cache realpath
373
: "${realpath_cache=}" # default off because slower than without
374
if test "$realpath_cache"; then
375
func_override realpath__no_cache
376
realpath() # caches the last result for efficiency
377
{
378
	local cache_key="$*"; load_cache
379
	if ! cached; then save_cache "$(realpath__no_cache "$@")" || return; fi
380
	echo_cached_value
381
}
382
fi
383

    
384
rel_path() # usage: base_dir=... path=... rel_path
385
{
386
	log++; kw_params base_dir path
387
	: "${base_dir:?}" "${path:?}"
388
	
389
	local path="$path/" # add *extra* / to match path when exactly = base_dir
390
	path="${path#$base_dir/}" # remove prefix shared with base_dir
391
	path="${path%/}" # remove any remaining extra trailing /
392
	
393
	if test ! "$path"; then path=.; fi # ensure non-empty
394
	
395
	echo_vars path
396
	echo "$path"
397
}
398

    
399
cd -P . # expand symlinks in $PWD so it matches the output of realpath
400
# do before setting $top_script_abs so realpath has less symlinks to resolve
401

    
402
canon_rel_path()
403
{
404
	local path; path="$(realpath "$1")" || return
405
	base_dir="$PWD" rel_path
406
}
407

    
408
# makes $1 a canon_rel_path if it's a filesystem path
409
alias cmd2rel_path="$(cat <<'EOF'
410
if test "$(type -t "$1")" = file && test -e "$1"; then # not relative to PATH
411
	declare _1="$1"; shift
412
	_1="$(canon_rel_path "$_1")" || return
413
	set -- "$_1" "$@"
414
fi
415
EOF
416
)"
417

    
418

    
419
#### verbose output
420

    
421

    
422
### command echoing
423

    
424
alias echo_params='log "$*"'
425

    
426
fi # load new aliases
427
if self_being_included; then
428

    
429
echo_cmd() { echo_params; }
430

    
431
function echo_run() { echo_params; "$@"; }
432
alias echo_run='"echo_run" ' # last space alias-expands next word
433

    
434
echo_eval() { echo_params; builtin eval "$@"; }
435

    
436
# usage: redirs=(...); [cmd_name_log_inc=#] echo_redirs_cmd
437
function echo_redirs_cmd()
438
{
439
	local cmd_name_log_inc="${cmd_name_log_inc-0}"
440
	
441
	# print <>file redirs before cmd, because they introduce it
442
	"log+" "$cmd_name_log_inc" echo_cmd "$@" $(
443
		set -- "${redirs[@]}" # operate on @redirs
444
		while test "$#" -gt 0 && starts_with '[<>][^&]' "$1"
445
		do log "$1 \\"; shift; done # log() will run *before* echo_cmd itself
446
		echo "$@"
447
	)
448
}
449
alias echo_redirs_cmd='"echo_redirs_cmd" "$@"'
450

    
451
## vars
452

    
453
echo_vars() # usage: echo_vars var...
454
{
455
	log+ 2
456
	if can_log; then
457
		local var
458
		for var in "${@%%=*}"; do
459
			if isset "$var"; then log "$(declare -p "$var")"; fi
460
		done
461
	fi
462
}
463

    
464
echo_export() { builtin export "$@"; echo_vars "$@"; }
465

    
466
alias export="echo_export" # automatically echo env vars when they are set
467

    
468
func_override kw_params__lang
469
kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
470

    
471
## functions
472

    
473
# usage: local func=...; set_func_loc; use $file, $line
474
alias set_func_loc="$(cat <<'EOF'
475
: "${func:?}"
476
local func_info="$(shopt -s extdebug; declare -F "$func")" # 'func line file'
477
func_info="${func_info#$func }"
478
local line="${func_info%% *}"
479
local file="${func_info#$line }"
480
EOF
481
)"
482

    
483
fi # load new aliases
484
if self_being_included; then
485

    
486
func_loc() # gets where function declared in the format file:line
487
{
488
	local func="$1"; set_func_loc
489
	file="$(canon_rel_path "$file")" || return
490
	echo "$file:$line"
491
}
492

    
493
# usage: func() { [minor=1] echo_func; ... }
494
function echo_func()
495
# usage: [minor=1] "echo_func" "$FUNCNAME" "$@" && indent || true
496
# exit status: whether function call was echoed
497
{
498
	kw_params minor
499
	local func="$1"; shift
500
	
501
	log++; if test "$minor"; then log++; fi
502
	local loc; loc="$(func_loc "$func")" || return
503
	echo_cmd "$loc" "$func" "$@"
504
	can_log
505
}
506
alias echo_func='"echo_func" "$FUNCNAME" "$@" && indent || true'
507

    
508
fi # load new aliases
509
if self_being_included; then
510

    
511

    
512
#### streams
513

    
514
fd_exists() { (: <&"$1") 2>/dev/null; }
515

    
516
require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
517
{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
518

    
519
set_fds() # usage: set_fds redirect...
520
{
521
	echo_func
522
	
523
	# add #<>&- before every #<>&# reopen to fix strange bash bug
524
	local redirs=()
525
	for i in "$@"; do
526
		local redir_prefix="$(match_prefix '*[<>]' "$i")"
527
		if test "$redir_prefix"; then redirs+=("$redir_prefix&-"); fi
528
		redirs+=("$i")
529
	done
530
	set -- "${redirs[@]}"
531
	
532
	echo_eval exec "$@"
533
}
534

    
535
fd_set_default() # usage: fd_set_default 'dest[<>]src'
536
{
537
	echo_func
538
	local dest="${1%%[<>]*}"
539
	require_fd_not_exists "$dest" || return 0
540
	set_fds "$1"
541
}
542

    
543
function filter_fd() # usage: (fd=# filter_fd filter_cmd...; with filter...)
544
# useful e.g. to filter logging output or highlight errors
545
{
546
	echo_func; kw_params fd; : "${fd?}"
547
	set_fds "$fd>" >(pipe_delay; redirs=(">&$fd" "${redirs[@]}"); redir "$@")
548
	pipe_delay; pipe_delay # wait for >()'s pipe_delay and initial logging
549
}
550
alias filter_fd='"filter_fd" ' # last space alias-expands next word
551

    
552
# convention: use fd 40/41/42 for command-specific alternate stdin/stdout/stderr
553
# do NOT use 1x, which are used by eval (which is used by set_fds())
554
# do NOT use 2x, which are used as global stdin/stdout/stderr
555
# do NOT use 3x, which are used for logging
556

    
557
setup_log_fd() # view logging output at verbosity >= 5
558
{
559
	log+ 4; log-- echo_func 
560
	fd_set_default '30>&2' || true # stdlog
561
	log_fd=30 # stdlog
562
}
563
setup_log_fd
564

    
565
set_global_fds()
566
# allows commands to access global stdin/stdout/stderr using fd 20/21/22
567
# this works even when /dev/tty isn't available
568
# view logging output at verbosity >= 3
569
{
570
	log+ 2; log-- echo_func
571
	# ignore errors if a source fd isn't open
572
	fd_set_default '20<&0' || true
573
	fd_set_default '21>&1' || true
574
	fd_set_default '22>&2' || true
575
}
576
set_global_fds
577

    
578
# usage: explicit_errors_only=1 script...
579
# show only explicitly-displayed errors (which have been redirected to fd 22)
580
# most of the time this has the same effect as `verbosity=0 script...`,
581
# which displays everything that isn't explicitly hidden
582
# this option should only be used for testing the explicit error displaying
583
if test "$explicit_errors_only"; then disable_logging; fi
584

    
585

    
586
echo_vars is_outermost
587

    
588

    
589
#### paths
590

    
591
top_symlink_dir="$(dirname "$0")"; echo_vars top_symlink_dir
592
top_symlink_dir_abs="$(realpath "$top_symlink_dir")"
593
	echo_vars top_symlink_dir_abs
594

    
595
top_script_abs="$(realpath "$0")"; echo_vars top_script_abs # outermost script
596
	# realpath this before doing any cd so this points to the right place
597
top_dir_abs="$(dirname "$top_script_abs")"; echo_vars top_dir_abs
598

    
599
set_paths()
600
{
601
	top_script="$(canon_rel_path "$top_script_abs")" || return
602
		echo_vars top_script
603
	top_dir="$(dirname "$top_script")" || return; echo_vars top_dir
604
}
605
set_paths
606

    
607
PATH_rm() # usage: PATH_rm path... # removes components from the PATH
608
{
609
	echo_func; echo_vars PATH; : "${PATH?}"
610
	PATH=":$PATH:" # add *extra* : to match at beginning and end
611
	for path in "$@"; do PATH="${PATH//:$path:/:}"; done
612
	PATH="${PATH#:}" # remove any remaining extra leading :
613
	PATH="${PATH%:}" # remove any remaining extra trailing :
614
	echo_vars PATH
615
}
616

    
617
no_PATH_recursion() # usage: (no_PATH_recursion; cmd...)
618
# allows running a system command of the same name as the script
619
{
620
	echo_func
621
	PATH_rm "$top_dir_abs" "$top_symlink_dir" "$top_symlink_dir_abs" "$top_dir"
622
}
623

    
624

    
625
#### verbose output
626

    
627

    
628
## internal commands
629

    
630
.()
631
{
632
	cmd2rel_path; set -- "$FUNCNAME" "$@"
633
	if (log++; echo_params; can_log); then indent; fi
634
	builtin "$@"
635
}
636

    
637
cd() # indent is permanent within subshell cd was used in
638
{
639
	log++ echo_func
640
	cmd2rel_path; echo_cmd "$FUNCNAME" "$@"
641
	if can_log; then caller_indent; fi
642
	# -P: expand symlinks so $PWD matches the output of realpath
643
	builtin "$FUNCNAME" -P "$@"
644
	
645
	func=realpath clear_cache
646
	set_paths
647
}
648

    
649
## external commands
650

    
651
disable_logging() { set_fds "$log_fd>/dev/null"; }
652

    
653
function redir() # usage: local redirs=(#<>...); redir cmd...; unset redirs
654
# to view only explicitly-displayed errors: explicit_errors_only=1 script...
655
{
656
	echo_func; kw_params redirs
657
	
658
	case "$1" in redir|command) "$@"; return;; esac # redir will be run later
659
	(
660
		log++ set_fds "${redirs[@]}"
661
		(case "$1" in command__exec) shift;; esac; echo_redirs_cmd)
662
		"$@"
663
	) || return
664
}
665
alias redir='"redir" ' # last space alias-expands next word
666

    
667
alias_append save_e '; unset redirs' # don't redirect error handlers
668

    
669
command() # usage: [cmd_log_fd=|1|2|#] [verbosity_min=] command extern_cmd...
670
{
671
	echo_func; kw_params log_fd cmd_log_fd redirs verbosity_min
672
	# if no cmd_log_fd, limit log_fd in case command uses util.sh
673
	local cmd_log_fd="${cmd_log_fd-$log_fd}"
674
	local redirs=("${redirs[@]}")
675
	
676
	# determine redirections
677
	if test "$cmd_log_fd"; then
678
		if can_log; then
679
			if test "$cmd_log_fd" != "$log_fd"; then
680
				redirs+=("$cmd_log_fd>&$log_fd")
681
			fi # else no redir needed
682
		else redirs+=("$cmd_log_fd>/dev/null");
683
		fi
684
	fi
685
	
686
	cmd2rel_path
687
	redir command__exec "$@" || die_e
688
}
689
command__exec()
690
{
691
	ensure_nested_func
692
	if can_log; then indent; fi
693
	if test "$verbosity_min"; then verbosity_min "$verbosity_min"; fi
694
	builtin command "$@"
695
}
696

    
697
# auto-echo common external commands
698
for cmd in env rm; do alias "$cmd=command $cmd"; done; unset cmd
699

    
700

    
701
### external command input/output
702

    
703
echo_stdin() # usage: input|echo_stdin|cmd
704
{
705
	if can_log; then
706
		pipe_delay
707
		echo ----- >&"$log_fd"
708
		tee -a /dev/fd/"$log_fd";
709
		echo ----- >&"$log_fd"
710
	else cat
711
	fi
712
}
713

    
714
echo_stdout() { echo_stdin; } # usage: cmd|echo_stdout
715

    
716

    
717
#### commands
718

    
719
already_exists_msg() # usage: cond || what=... already_exists_msg || return 0
720
{ type=info die "$what already exists, skipping"; }
721

    
722
require_not_exists() # usage: require_not_exists file || return 0
723
{ test ! -e "$1" || what="file \"$1\"" already_exists_msg; }
724

    
725
function to_file() # usage: stdout=... [if_not_exists=1] [del=] to_file cmd...
726
# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
727
{
728
	echo_func; kw_params stdout if_not_exists del
729
	: "${stdout?}"; local del="${del-1}"
730
	if test "$if_not_exists"; then require_not_exists "$stdout" || return 0; fi
731
	
732
	local redirs=("${redirs[@]}" ">$stdout")
733
	redir "$@" || { save_e; test ! "$del" || rm "$stdout"; rethrow; }
734
}
735
alias to_file='"to_file" ' # last space alias-expands next word
736

    
737
log_bg() { symbol='&' log_custom "$@"; }
738

    
739
log_last_bg() { log_bg '$!='"$!"; }
740

    
741
function bg_cmd() { echo_func; "$@" & log_last_bg; } # usage: bg_cmd cmd...
742
alias bg_cmd='"bg_cmd" ' # last space alias-expands next word
743

    
744
run_args_cmd() # runs the command line args command
745
{
746
	eval set -- "$(reverse "${BASH_ARGV[@]}")"
747
	test $# -ge 1 || set -- all
748
	echo_cmd "$top_script" "$@"; "$@"
749
}
750

    
751
fwd() # usage: subdirs=(...); fwd "$FUNCNAME" "$@"
752
{
753
	echo_func
754
	: "${subdirs?}"
755
	
756
	for subdir in "${subdirs[@]}"; do "$top_dir"/"$subdir"/run "$@"; done
757
}
758

    
759

    
760
#### filesystem
761

    
762
alias file_size=\
763
"stat `case "$(uname)" in Darwin) echo -f %z;; *) echo --format=%s;; esac`"
764

    
765

    
766
#### URLs
767

    
768
localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
769

    
770
fi
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