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1
#!/bin/bash -e
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set -o errexit -o pipefail # errexit in case caller's #! line missing -e
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4
if test ! "$_util_sh_include_guard_utils"; then
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_util_sh_include_guard_utils=1
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isset() { declare -p "$1" &>/dev/null; }
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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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#### stubs
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__caller_indent='log_indent="$log_indent$log_indent_step"'
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alias caller_indent="$__caller_indent"
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alias indent="declare $__caller_indent"
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function echo_func() { :; }
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alias echo_func='"echo_func" "$FUNCNAME" "$@" && indent || true'
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function echo_run() { :; }
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alias echo_run='"echo_run" ' # last space alias-expands next word
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function echo_vars() { :; }
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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
84
)"
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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")'"$2"'; } # usage: alias_append alias '; cmd'
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#### functions
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kw_params() # usage: func() { kw_params param_var...; }; ...; param_var=... cmd
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# removes keyword-param-only vars from the environment
121
{ unexport "$@"; }
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# usage: cmd=... foreach_arg
124
function foreach_arg()
125
{
126
	echo_func; kw_params cmd; : "${cmd:?}"
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	local a; for a in "$@"; do
128
		a="$(clog++ echo_run "$cmd" "$a")" || return; args+=("$a")
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	done
130
	echo_vars args
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}
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alias foreach_arg='"foreach_arg" "$@"; set -- "${args[@]}"; unset args'
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alias self='command "${FUNCNAME%%__*}"' # usage: wrapper() { self ...; }
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alias self_sys='command -p "${FUNCNAME%%__*}"' # wrapper() { self_sys ...; }
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137
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; }
146
alias export_e='e=$?'
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alias save_e='declare e=$?'
148
alias rethrow='return "$e"'
149
alias rethrow_subshell='exit "$e"'
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151
fi # load new aliases
152
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 "$@" || { export_e; true; }; }
157
alias try='declare e; "try" ' # last space alias-expands next word
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catch() { test "$e" -eq "$1" && e=0; }
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ignore_e() { catch "$@" || true; }
162

    
163
alias end_try='rethrow'
164
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
169

    
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sig_e() { echo $(( 128+$(kill -l "$1") )); } # usage: sig_e SIGINT, etc.
171

    
172
ignore_sig() { ignore "$(sig_e "$1")"; }
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# usage: piped_cmd cmd1...|cmd2... # cmd2 doesn't read all its input
175
function piped_cmd() { "$@" || ignore_sig SIGPIPE; }
176
alias piped_cmd='"piped_cmd" ' # last space alias-expands next word
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178
fi # load new aliases
179
if self_being_included; then
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#### integers
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184
let!() { let "$@" || true; } # always returns true; safe to use for setting
185
	# "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 )); }
190

    
191
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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198
dec_suffix() { echo "${1#$(int_part "$1")}"; }
199

    
200
round_down() { int_part "$1"; }
201

    
202
float+int() { echo "$(($(int_part "$1")+$2))$(dec_suffix "$1")"; }
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204
float_set_min() { if (($(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
210

    
211
match_prefix() # usage: match_prefix pattern str
212
{ if starts_with "$1" "$2"; then echo "${2%${2#$1}}"; fi }
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214
repeat() # usage: str=... n=... repeat
215
{
216
	: "${str?}" "${n:?}"; local result= n="$n" # n will be modified in function
217
	for (( ; n > 0; n-- )); do result="$result$str"; done
218
	echo "$result"
219
}
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221
sed_cmd="sed -`case "$(uname)" in Darwin) echo E;; *) echo r;; esac`"
222
alias sed="$sed_cmd"
223

    
224
fi # load new aliases
225
if self_being_included; then
226

    
227
rtrim() { log+ 3; sed 's/[[:space:]]+$//' <<<"$1"; }
228

    
229

    
230
#### arrays
231

    
232
echo1() { echo "$1"; } # usage: echo1 values...
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234
join() { local IFS="$delim"; echo "$*"; } # usage: delim=... join elems...
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236
reverse() # usage: array=($(reverse args...))
237
{
238
	local i
239
	for (( i=$#; i > 0; i-- )); do printf '%q ' "${!i}"; done
240
}
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242
contains() # usage: contains value in_array...
243
{
244
	local value="$1"; shift
245
	local elem
246
	for elem in "$@"; do if test "$elem" = "$value"; then return 0; fi; done
247
	return 1
248
}
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250
#### streams
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252
pipe_delay() # usage: cmd1 | { pipe_delay; cmd2; }
253
{ sleep 0.1; } # s; display after leading output of cmd1
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256
#### verbose output
257

    
258

    
259
err_fd=2 # stderr
260

    
261
usage() { echo "Usage: $1" >&2; return 2; }
262

    
263

    
264
### log++
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266
log_fd=2 # initially stderr
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268
if test "$explicit_errors_only"; then verbosity=0; fi # hide startup logging
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270
# set verbosity
271
if isset verbose; then : "${verbosity:=$(bool2int "$verbose")}"; fi
272
if isset vb; then : "${verbosity:=$vb}"; fi
273
: "${verbosity=1}" # default
274
: "${verbosity:=0}" # ensure non-empty
275
export verbosity # propagate to invoked commands
276
export PS4 # follows verbosity, so also propagate this
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278
is_outermost="$(! isset log_level; exit2bool)" # if util.sh env not yet set up
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280
# set log_level
281
: "${log_level=$(( ${#PS4}-1 ))}" # defaults to # non-space symbols in PS4
282
export log_level # propagate to invoked commands
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284
verbosity_int() { round_down "$verbosity"; }
285

    
286
# verbosities (and `make` equivalents):
287
# 0: just print errors. useful for cron jobs.
288
#    vs. make: equivalent to --silent, but suppresses external command output
289
# 1: also external commands run. useful for running at the command line.
290
#    vs. make: not provided (but sorely needed to avoid excessive output)
291
# 2: full graphical call tree. useful for determining where error occurred.
292
#    vs. make: equivalent to default verbosity, but with much-needed indents
293
# 3: also values of kw params and variables. useful for low-level debugging.
294
#    vs. make: not provided; need to manually use $(error $(var))
295
# 4: also variables in util.sh commands. useful for debugging util.sh.
296
#    vs. make: somewhat similar to --print-data-base
297
# 5: also variables in logging commands themselves. useful for debugging echo_*.
298
#    vs. make: not provided; need to search Makefile for @ at beginning of cmd
299
# 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
302
# for messages that use can_log(), the log_level starts with *1*, not 0
303
# for unfiltered messages, the log_level is 0 (i.e. still output at verbosity=0)
304
# to view a message's log_level, count the # of + signs before it in the output
305

    
306
fi # load new aliases
307
if self_being_included; then
308

    
309
# usage: in func:      log++; ...         OR  log_local; "log++"; ...
310
#        outside func: log++; ...; log--
311
#        before cmd:  "log++" cmd  OR  "log+" # cmd  OR  "log++" "log++" cmd
312
# with a cmd, assignments are applied just to it, so log_local is not needed
313
# without a cmd, "$@" expands to nothing and assignments are applied to caller
314
# "${@:2}" expands to all of $@ after *1st* arg, not 2nd ($@ indexes start at 1)
315
log+()
316
{
317
	# no local vars because w/o cmd, assignments should be applied to caller
318
	PS4="$(str="${PS4:0:1}" n=$((log_level+$1-1)) repeat)${PS4: -2}"; \
319
	log_level=$((log_level+$1)) \
320
	verbosity="$(float+int "$verbosity" "-$1")" "${@:2}"
321
}
322
log++() { log+  1 "$@"; }
323
log--() { log+ -1 "$@"; }
324
alias log_local=\
325
'declare PS4="$PS4" log_level="$log_level" verbosity="$verbosity"'
326
alias log+='log_local; "log+"' # don't expand next word because it's not a cmd
327
alias log++='log_local; "log++" ' # last space alias-expands next word
328
alias log--='log_local; "log--" ' # last space alias-expands next word
329
# no clog+ alias because next word is not a cmd
330
alias clog++='"log++" ' # last space alias-expands next word
331
alias clog--='"log--" ' # last space alias-expands next word
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333
verbosity_min() # usage: verbosity_min {min|} # ''->verbosity=''
334
{ if test ! "$1" -o "$(verbosity_int)" -lt "$1"; then verbosity="$1"; fi; }
335
alias verbosity_min='log_local; "verbosity_min"'
336

    
337
# usage: (verbosity_compat; cmd)
338
function verbosity_compat()
339
{ echo_func; if ((verbosity == 1)); then unset verbosity; fi; }
340
alias verbosity_compat='declare verbosity; "verbosity_compat"'
341

    
342

    
343
# indent for call tree. this is *not* the log_level (below).
344
: "${log_indent_step=| }" "${log_indent=}"
345
export log_indent_step log_indent # propagate to invoked commands
346

    
347
# see indent alias in stubs
348

    
349

    
350
fi # load new aliases
351
if self_being_included; then
352

    
353
can_log() { test "$(verbosity_int)" -gt 0; }
354
	# verbosity=0 turns off all logging
355

    
356
log() { if can_log; then echo "$log_indent$PS4$1" >&"$log_fd"; fi; }
357

    
358
log_custom() # usage: symbol=... log_custom msg
359
{ log_indent="${log_indent//[^ ]/$symbol}" PS4="${PS4//[^ ]/$symbol}" log "$@";}
360

    
361
log_err() { symbol='#' verbosity=1 log_fd="$err_fd" log_custom "$@"; }
362

    
363
log_info() { symbol=: log_custom "$@"; }
364

    
365
die() # usage: cmd || [type=...] die msg # msg can use $? but not $()
366
{ save_e; kw_params type; "log_${type:-err}" "$1"; rethrow; }
367

    
368
die_e() # usage: cmd || [benign_error=1] die_e [|| handle error]
369
{
370
	save_e; kw_params benign_error
371
	if test "$benign_error"; then log++; fi
372
	type="${benign_error:+info}" die "command exited with \
373
$(if test "$benign_error"; then echo status; else echo error; fi) $e"
374
	rethrow
375
}
376

    
377

    
378
#### functions
379

    
380
func_exists() { declare -f "$1" >/dev/null; }
381

    
382
copy_func() # usage: from=... to=... copy_func
383
# $to must not exist. to get around the no-clobber restriction, use `unset -f`.
384
{
385
	: "${from:?}" "${to:?}"
386
	func_exists "$from" || die "function does not exist: $from"
387
	! func_exists "$to" || die "function already exists: $to"
388
	local from_def="$(declare -f "$from")"
389
	eval "$to${from_def#$from}"
390
}
391

    
392
func_override() # usage: func_override old_name__suffix
393
{ from="${1%__*}" to="$1" copy_func; }
394

    
395
ensure_nested_func() # usage: func__nested_func() { ensure_nested_func; ... }
396
{
397
	local nested_func="${FUNCNAME[1]}"
398
	local func="${nested_func%%__*}"
399
	contains "$func" "${FUNCNAME[@]}" || \
400
		die "$nested_func() must be used by $func()"
401
}
402

    
403

    
404
#### paths
405

    
406
# cache realpath
407
: "${realpath_cache=}" # default off because slower than without
408
if test "$realpath_cache"; then
409
func_override realpath__no_cache
410
realpath() # caches the last result for efficiency
411
{
412
	local cache_key="$*"; load_cache
413
	if ! cached; then save_cache "$(realpath__no_cache "$@")" || return; fi
414
	echo_cached_value
415
}
416
fi
417

    
418
rel_path() # usage: base_dir=... path=... rel_path
419
{
420
	kw_params base_dir path
421
	: "${base_dir:?}" "${path:?}"
422
	
423
	local path="$path/" # add *extra* / to match path when exactly = base_dir
424
	path="${path#$base_dir/}" # remove prefix shared with base_dir
425
	path="${path%/}" # remove any remaining extra trailing /
426
	
427
	if test ! "$path"; then path=.; fi # ensure non-empty
428
	
429
	echo_vars path
430
	echo "$path"
431
}
432

    
433
cd -P . # expand symlinks in $PWD so it matches the output of realpath
434
# do before setting $top_script_abs so realpath has less symlinks to resolve
435

    
436
canon_rel_path() # usage: [base_dir=...] canon_rel_path path
437
{
438
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
439
	base_dir="$(realpath "$base_dir")" || return
440
	local path; path="$(realpath "$1")" || return
441
	rel_path
442
}
443

    
444
# makes $1 a canon_rel_path if it's a filesystem path
445
alias cmd2rel_path="$(cat <<'EOF'
446
if test "$(type -t "$1")" = file && test -e "$1"; then # not relative to PATH
447
	declare _1="$1"; shift
448
	_1="$(clog++ canon_rel_path "$_1")" || return
449
	set -- "$_1" "$@"
450
fi
451
EOF
452
)"
453

    
454
# usage: path_parents path; use ${dirs[@]} # includes the path itself
455
function path_parents()
456
{
457
	echo_func; local path="$1" prev_path=; dirs=()
458
	while test "$path" != "$prev_path"; do
459
		prev_path="$path"
460
		dirs+=("$path")
461
		path="${path%/*}"
462
	done
463
}
464
alias path_parents='declare dirs; "path_parents"'
465

    
466

    
467
#### verbose output
468

    
469

    
470
### command echoing
471

    
472
alias echo_params='log "$*"'
473

    
474
fi # load new aliases
475
if self_being_included; then
476

    
477
echo_cmd() { echo_params; }
478

    
479
function echo_run() { echo_params; "$@"; }
480
# see echo_run alias after stub
481

    
482
echo_eval() { echo_params; builtin eval "$@"; }
483

    
484
# usage: redirs=(...); [cmd_name_log_inc=#] echo_redirs_cmd
485
function echo_redirs_cmd()
486
{
487
	local cmd_name_log_inc="${cmd_name_log_inc-0}"
488
	
489
	# print <>file redirs before cmd, because they introduce it
490
	"log+" "$cmd_name_log_inc" echo_cmd "$@" $(
491
		set -- "${redirs[@]}" # operate on ${redirs[@]}
492
		while test "$#" -gt 0 && starts_with '[<>][^&]' "$1"
493
		do log "$1 \\"; shift; done # log() will run *before* echo_cmd itself
494
		echo "$@"
495
	)
496
}
497
alias echo_redirs_cmd='"echo_redirs_cmd" "$@"'
498

    
499
## vars
500

    
501
echo_vars() # usage: echo_vars var...
502
{
503
	log+ 2
504
	if can_log; then
505
		local var
506
		for var in "${@%%=*}"; do
507
			if isset "$var"; then log "$(declare -p "$var")"; fi
508
		done
509
	fi
510
}
511

    
512
echo_export() { builtin export "$@"; echo_vars "$@"; }
513

    
514
alias export="echo_export" # automatically echo env vars when they are set
515

    
516
func_override kw_params__lang
517
kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
518

    
519
## functions
520

    
521
# usage: local func=...; set_func_loc; use $file, $line
522
alias set_func_loc="$(cat <<'EOF'
523
: "${func:?}"
524
local func_info="$(shopt -s extdebug; declare -F "$func")" # 'func line file'
525
func_info="${func_info#$func }"
526
local line="${func_info%% *}"
527
local file="${func_info#$line }"
528
EOF
529
)"
530

    
531
fi # load new aliases
532
if self_being_included; then
533

    
534
func_loc() # gets where function declared in the format file:line
535
{
536
	local func="$1"; set_func_loc
537
	file="$(canon_rel_path "$file")" || return
538
	echo "$file:$line"
539
}
540

    
541
# usage: func() { [minor=1] echo_func; ... }
542
function echo_func()
543
# usage: "echo_func" "$FUNCNAME" "$@" && indent || true
544
# exit status: whether function call was echoed
545
{
546
	log++; can_log || return
547
	local func="$1"; shift
548
	local loc; loc="$(clog++ func_loc "$func")" || return
549
	echo_cmd "$loc" "$func" "$@"
550
}
551
# see echo_func alias after stub
552

    
553
fi # load new aliases
554
if self_being_included; then
555

    
556

    
557
#### streams
558

    
559
fd_exists() { (: <&"$1") 2>/dev/null; }
560

    
561
require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
562
{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
563

    
564
set_fds() # usage: set_fds redirect...
565
{
566
	echo_func
567
	
568
	# add #<>&- before every #<>&# reopen to fix strange bash bug
569
	local redirs=() i
570
	for i in "$@"; do
571
		local redir_prefix="$(match_prefix '*[<>]' "$i")"
572
		if test "$redir_prefix"; then redirs+=("$redir_prefix&-"); fi
573
		redirs+=("$i")
574
	done
575
	set -- "${redirs[@]}"
576
	
577
	if (($# > 0)); then echo_eval exec "$@"; fi
578
}
579

    
580
fd_set_default() # usage: fd_set_default 'dest[<>]src'
581
{
582
	echo_func
583
	local dest="${1%%[<>]*}"
584
	require_fd_not_exists "$dest" || return 0
585
	set_fds "$1"
586
}
587

    
588
function filter_fd() # usage: (fd=# filter_fd filter_cmd...; with filter...)
589
# useful e.g. to filter logging output or highlight errors
590
{
591
	echo_func; kw_params fd; : "${fd?}"
592
	set_fds "$fd>" >(pipe_delay; redirs=(">&$fd" "${redirs[@]}"); redir "$@")
593
	pipe_delay; pipe_delay # wait for >()'s pipe_delay and initial logging
594
}
595
alias filter_fd='"filter_fd" ' # last space alias-expands next word
596

    
597
# convention: use fd 40/41/42 for command-specific alternate stdin/stdout/stderr
598
# mnemonic: 4 looks like A for Alternate
599
# do NOT use 1x, which are used by eval (which is used by set_fds())
600
# do NOT use 2x, which are used as global stdin/stdout/stderr
601
# do NOT use 3x, which are used for logging
602

    
603
setup_log_fd() # view logging output at verbosity >= 5
604
{
605
	log+ 4; log-- echo_func 
606
	fd_set_default '30>&2' || true # stdlog
607
	log_fd=30 # stdlog
608
}
609
setup_log_fd
610

    
611
set_global_fds()
612
# allows commands to access global stdin/stdout/stderr using fd 20/21/22
613
# this works even when /dev/tty isn't available
614
# view logging output at verbosity >= 3
615
{
616
	log+ 2; log-- echo_func
617
	# ignore errors if a source fd isn't open
618
	fd_set_default '20<&0' || true
619
	fd_set_default '21>&1' || true
620
	fd_set_default '22>&2' || true
621
}
622
set_global_fds
623

    
624
# usage: explicit_errors_only=1 script...
625
# show only explicitly-displayed errors (which have been redirected to fd 22)
626
# most of the time this has the same effect as `verbosity=0 script...`,
627
# which displays everything that isn't explicitly hidden
628
# this option should only be used for testing the explicit error displaying
629
if test "$explicit_errors_only"; then disable_logging; fi
630

    
631

    
632
echo_vars is_outermost
633

    
634

    
635
#### paths
636

    
637
top_symlink_dir="$(dirname "$0")"; echo_vars top_symlink_dir
638
top_symlink_dir_abs="$(realpath "$top_symlink_dir")"
639
	echo_vars top_symlink_dir_abs
640

    
641
top_script_abs="$(realpath "$0")"; echo_vars top_script_abs # outermost script
642
	# realpath this before doing any cd so this points to the right place
643
top_dir_abs="$(dirname "$top_script_abs")"; echo_vars top_dir_abs
644

    
645
set_paths()
646
{
647
	top_script="$(clog++ canon_rel_path "$top_script_abs")" || return
648
		echo_vars top_script
649
	top_dir="$(dirname "$top_script")" || return; echo_vars top_dir
650
}
651
set_paths
652

    
653
# usage: in_top_dir cmd...
654
function in_top_dir() { echo_func; (cd "$top_dir"; "$@"); }
655
alias in_top_dir='"in_top_dir" ' # last space alias-expands next word
656

    
657
PATH_rm() # usage: PATH_rm path... # removes components from the PATH
658
{
659
	echo_func; echo_vars PATH; : "${PATH?}"
660
	PATH=":$PATH:" # add *extra* : to match at beginning and end
661
	for path in "$@"; do PATH="${PATH//:$path:/:}"; done
662
	PATH="${PATH#:}" # remove any remaining extra leading :
663
	PATH="${PATH%:}" # remove any remaining extra trailing :
664
	echo_vars PATH
665
}
666

    
667
no_PATH_recursion() # usage: (no_PATH_recursion; cmd...)
668
# allows running a system command of the same name as the script
669
{
670
	echo_func
671
	PATH_rm "$top_dir_abs" "$top_symlink_dir" "$top_symlink_dir_abs" "$top_dir"
672
}
673

    
674

    
675
#### verbose output
676

    
677

    
678
## internal commands
679

    
680
.()
681
{
682
	clog++ clog++ echo_func
683
	cmd2rel_path; set -- "$FUNCNAME" "$@"
684
	if (log++; echo_params; can_log); then indent; fi
685
	builtin "$@"
686
}
687

    
688
.rel() # usage: .rel file [args...] # file relative to ${BASH_SOURCE[0]} dir
689
{
690
	clog++ clog++ echo_func; local file="$1"; shift
691
	. "$(canon_rel_path "$(dirname "${BASH_SOURCE[1]}")/$file")" "$@"
692
}
693

    
694
cd() # indent is permanent within subshell cd was used in
695
{
696
	log++ echo_func
697
	cmd2rel_path; echo_cmd "$FUNCNAME" "$@"
698
	if can_log; then caller_indent; fi
699
	# -P: expand symlinks so $PWD matches the output of realpath
700
	builtin "$FUNCNAME" -P "$@"
701
	
702
	func=realpath clear_cache
703
	set_paths
704
}
705

    
706
## external commands
707

    
708
disable_logging() { set_fds "$log_fd>/dev/null"; }
709

    
710
function redir() # usage: local redirs=(#<>...); redir cmd...; unset redirs
711
# to view only explicitly-displayed errors: explicit_errors_only=1 script...
712
{
713
	echo_func; kw_params redirs
714
	
715
	case "$1" in redir|command) "$@"; return;; esac # redir will be run later
716
	(
717
		log++ set_fds "${redirs[@]}"
718
		(case "$1" in command__exec) shift;; esac; echo_redirs_cmd)
719
		"$@"
720
	) || return
721
}
722
alias redir='"redir" ' # last space alias-expands next word
723

    
724
alias_append save_e '; unset redirs' # don't redirect error handlers
725

    
726
command() # usage: [cmd_log_fd=|1|2|#] [verbosity_min=] command extern_cmd...
727
{
728
	echo_func; kw_params log_fd cmd_log_fd redirs verbosity_min
729
	# if no cmd_log_fd, limit log_fd in case command uses util.sh
730
	local cmd_log_fd="${cmd_log_fd-$log_fd}"
731
	local redirs=("${redirs[@]}")
732
	
733
	# determine redirections
734
	if test "$cmd_log_fd"; then
735
		if can_log; then
736
			if test "$cmd_log_fd" != "$log_fd"; then
737
				redirs+=("$cmd_log_fd>&$log_fd")
738
			fi # else no redir needed
739
		else redirs+=("$cmd_log_fd>/dev/null");
740
		fi
741
	fi
742
	
743
	cmd2rel_path
744
	redir command__exec "$@" || die_e
745
}
746
command__exec()
747
{
748
	ensure_nested_func
749
	if can_log; then indent; fi
750
	if test "$verbosity_min"; then verbosity_min "$verbosity_min"; fi
751
	verbosity_compat
752
	builtin command "$@"
753
}
754

    
755
# auto-echo common external commands
756
for cmd in env rm; do alias "$cmd=command $cmd"; done; unset cmd
757

    
758

    
759
### external command input/output
760

    
761
echo_stdin() # usage: input|echo_stdin|cmd
762
{
763
	if can_log; then
764
		pipe_delay
765
		echo ----- >&"$log_fd"
766
		tee -a /dev/fd/"$log_fd";
767
		echo ----- >&"$log_fd"
768
	else cat
769
	fi
770
}
771

    
772
echo_stdout() { echo_stdin; } # usage: cmd|echo_stdout
773

    
774

    
775
#### commands
776

    
777
already_exists_msg() # usage: cond || what=... already_exists_msg || return 0
778
{ type=info die "$what already exists, skipping"; }
779

    
780
require_not_exists() # usage: require_not_exists file || return 0
781
{ test ! -e "$1" || what="file \"$1\"" already_exists_msg; }
782

    
783
function to_file() # usage: stdout=... [if_not_exists=1] [del=] to_file cmd...
784
# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
785
{
786
	echo_func; kw_params stdout if_not_exists del
787
	: "${stdout?}"; local del="${del-1}"
788
	if test "$if_not_exists"; then require_not_exists "$stdout" || return 0; fi
789
	
790
	local redirs=("${redirs[@]}" ">$stdout")
791
	redir "$@" || { save_e; test ! "$del" || rm "$stdout"; rethrow; }
792
}
793
alias to_file='"to_file" ' # last space alias-expands next word
794

    
795
log_bg() { symbol='&' log_custom "$@"; }
796

    
797
log_last_bg() { log_bg '$!='"$!"; }
798

    
799
function bg_cmd() { echo_func; "$@" & log_last_bg; } # usage: bg_cmd cmd...
800
alias bg_cmd='"bg_cmd" ' # last space alias-expands next word
801

    
802
run_args_cmd() # runs the command line args command
803
{
804
	eval set -- "$(reverse "${BASH_ARGV[@]}")"
805
	test $# -ge 1 || set -- all
806
	echo_cmd "$top_script" "$@"; time "$@"
807
}
808

    
809
fwd() # usage: subdirs=(...); fwd "$FUNCNAME" "$@"
810
{
811
	echo_func
812
	: "${subdirs?}"
813
	
814
	for subdir in "${subdirs[@]}"; do "$top_dir"/"$subdir"/run "$@"; done
815
}
816

    
817

    
818
#### filesystem
819

    
820
alias mkdir='mkdir -p'
821

    
822
alias file_size=\
823
"stat `case "$(uname)" in Darwin) echo -f %z;; *) echo --format=%s;; esac`"
824

    
825
alias wildcard='shopt -s nullglob; echo' # usage: "$(wildcard glob...)"
826
alias wildcard1='shopt -s nullglob; echo1' # usage: "$(wildcard1 glob...)"
827

    
828
fi # load new aliases
829
if self_being_included; then
830

    
831
mv2dir() { echo_func; mkdir "${!#}"; mv "$@"; } # usage: mv2dir ... dir
832

    
833
# usage: (mv_glob ... dir)
834
function mv_glob() { echo_func; if (($# > 1)); then mv2dir "$@"; fi; }
835
alias mv_glob='shopt -s nullglob; "mv_glob"'
836

    
837

    
838
#### URLs
839

    
840
localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
841

    
842
fi
(9-9/10)