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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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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" "$@" && indent || true'
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function echo_run() { :; }
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alias echo_run='"echo_run" ' # last space alias-expands next word
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# auto-echo common external commands
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for cmd in env rm which; do alias "$cmd=echo_run $cmd"; done; unset cmd
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echo_builtin() { :; }
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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
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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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#### commands
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sys_cmd_path() { echo_func; echo_builtin command -p which "$1"|echo_stdout; }
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# makes command in $1 a system command
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# allows running a system command of the same name as the script
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alias cmd2sys="$(cat <<'EOF'
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declare _1="$1"; shift
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_1="$(indent; clog++ sys_cmd_path "$_1")" || return
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set -- "$_1" "$@"
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EOF
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)"
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fi # load new aliases
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if self_being_included; then
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sys_cmd() { cmd2sys; command "$@"; } # usage: sys_cmd cmd... # runs system cmd
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	# allows running a system command of the same name as the script
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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 "$@"; }
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# usage: cmd=... foreach_arg
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function foreach_arg()
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{
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	echo_func; kw_params cmd; : "${cmd:?}"
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	local a; for a in "$@"; do
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		a="$(clog++ echo_run "$cmd" "$a")" || return; args+=("$a")
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	done
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	echo_vars args
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}
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alias foreach_arg='"foreach_arg" "$@"; set -- "${args[@]}"; unset args'
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alias self_name='echo "${FUNCNAME%%__*}"' # usage: "$(self_name)"
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alias self='command "$(self_name)"' # usage: wrapper() { self ...; }
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alias self_sys='sys_cmd "$(self_name)"' # wrapper() { self_sys ...; }
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pf() { declare -f "$@"; } # 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 "$1")"; }
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# usage: piped_cmd cmd1...|cmd2... # cmd2 doesn't read all its input
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function piped_cmd() { "$@" || 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#$1}}"; fi }
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repeat() # usage: str=... n=... repeat
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{
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	: "${str?}" "${n:?}"; local result= n="$n" # n will be modified in function
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	for (( ; n > 0; n-- )); do result="$result$str"; done
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	echo "$result"
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}
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sed_cmd="env LANG= sed -`case "$(uname)" in Darwin) echo E;; *) echo r;; esac`"
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	# LANG: avoid invalid UTF-8 "illegal byte sequence" errors when LANG=*.UTF-8
250
alias sed="$sed_cmd"
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	# can't be function because this causes segfault in redir() subshell when
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	# used with make.sh make() filter
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fi # load new aliases
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if self_being_included; then
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rtrim() { log+ 3; sed 's/[[:space:]]+$//' <<<"$1"; }
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#### arrays
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echo1() { echo "$1"; } # usage: echo1 values...
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# usage: split delim str; use ${parts[@]}
265
function split() { echo_func; local IFS="$1"; parts=($2); echo_vars parts; }
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alias split='declare parts; "split"'
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join() { local IFS="$delim"; echo "$*"; } # usage: delim=... join elems...
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reverse() # usage: array=($(reverse args...))
271
{
272
	local i
273
	for (( i=$#; i > 0; i-- )); do printf '%q ' "${!i}"; done
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}
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contains() # usage: contains value in_array...
277
{
278
	local value="$1"; shift
279
	local elem
280
	for elem in "$@"; do if test "$elem" = "$value"; then return 0; fi; done
281
	return 1
282
}
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284
#### streams
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286
pipe_delay() # usage: cmd1 | { pipe_delay; cmd2; }
287
{ sleep 0.1; } # s; display after leading output of cmd1
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#### verbose output
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err_fd=2 # stderr
294

    
295
usage() { echo "Usage: $1" >&2; return 2; }
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298
### log++
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300
log_fd=2 # initially stderr
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302
if test "$explicit_errors_only"; then verbosity=0; fi # hide startup logging
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# set verbosity
305
if isset verbose; then : "${verbosity:=$(bool2int "$verbose")}"; fi
306
if isset vb; then : "${verbosity:=$vb}"; fi
307
: "${verbosity=1}" # default
308
: "${verbosity:=0}" # ensure non-empty
309
export verbosity # propagate to invoked commands
310
export PS4 # follows verbosity, so also propagate this
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is_outermost="$(! isset log_level; exit2bool)" # if util.sh env not yet set up
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# set log_level
315
: "${log_level=$(( ${#PS4}-1 ))}" # defaults to # non-space symbols in PS4
316
export log_level # propagate to invoked commands
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318
verbosity_int() { round_down "$verbosity"; }
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320
# verbosities (and `make` equivalents):
321
# 0: just print errors. useful for cron jobs.
322
#    vs. make: equivalent to --silent, but suppresses external command output
323
# 1: also external commands run. useful for running at the command line.
324
#    vs. make: not provided (but sorely needed to avoid excessive output)
325
# 2: full graphical call tree. useful for determining where error occurred.
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#    vs. make: equivalent to default verbosity, but with much-needed indents
327
# 3: also values of kw params and variables. useful for low-level debugging.
328
#    vs. make: not provided; need to manually use $(error $(var))
329
# 4: also variables in util.sh commands. useful for debugging util.sh.
330
#    vs. make: somewhat similar to --print-data-base
331
# 5: also variables in logging commands themselves. useful for debugging echo_*.
332
#    vs. make: not provided; need to search Makefile for @ at beginning of cmd
333
# 6+: not currently used (i.e. same as 5)
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# definition: the log_level is the minimum verbosity needed to display a message
336
# for messages that use can_log(), the log_level starts with *1*, not 0
337
# for unfiltered messages, the log_level is 0 (i.e. still output at verbosity=0)
338
# to view a message's log_level, count the # of + signs before it in the output
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fi # load new aliases
341
if self_being_included; then
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343
# usage: in func:      log++; ...         OR  log_local; "log++"; ...
344
#        outside func: log++; ...; log--
345
#        before cmd:  "log++" cmd  OR  "log+" # cmd  OR  "log++" "log++" cmd
346
# with a cmd, assignments are applied just to it, so log_local is not needed
347
# without a cmd, "$@" expands to nothing and assignments are applied to caller
348
# "${@:2}" expands to all of $@ after *1st* arg, not 2nd ($@ indexes start at 1)
349
log+()
350
{
351
	# no local vars because w/o cmd, assignments should be applied to caller
352
	PS4="$(str="${PS4:0:1}" n=$((log_level+$1-1)) repeat)${PS4: -2}"; \
353
	log_level=$((log_level+$1)) \
354
	verbosity="$(float+int "$verbosity" "-$1")" "${@:2}"
355
}
356
log-() { log+ "-$1" "${@:2}"; }
357
log++() { log+ 1 "$@"; }
358
log--() { log- 1 "$@"; }
359
alias log_local=\
360
'declare PS4="$PS4" log_level="$log_level" verbosity="$verbosity"'
361
alias log+='log_local; "log+"' # don't expand next word because it's not a cmd
362
alias log++='log_local; "log++" ' # last space alias-expands next word
363
alias log--='log_local; "log--" ' # last space alias-expands next word
364
# no clog+ alias because next word is not a cmd
365
alias clog++='"log++" ' # last space alias-expands next word
366
alias clog--='"log--" ' # last space alias-expands next word
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368
verbosity_min() # usage: verbosity_min {min|} # ''->verbosity=''
369
{ if test ! "$1" -o "$(verbosity_int)" -lt "$1"; then verbosity="$1"; fi; }
370
alias verbosity_min='log_local; "verbosity_min"'
371

    
372
# usage: (verbosity_compat; cmd)
373
function verbosity_compat()
374
{ echo_func; if ((verbosity == 1)); then unset verbosity; fi; }
375
alias verbosity_compat='declare verbosity; "verbosity_compat"'
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377

    
378
# indent for call tree. this is *not* the log_level (below).
379
: "${log_indent_step=| }" "${log_indent=}"
380
export log_indent_step log_indent # propagate to invoked commands
381

    
382
# see indent alias in stubs
383

    
384

    
385
fi # load new aliases
386
if self_being_included; then
387

    
388
can_log() { test "$(verbosity_int)" -gt 0; }
389
	# verbosity=0 turns off all logging
390

    
391
log() { if can_log; then echo "$log_indent$PS4$1" >&"$log_fd"; fi; }
392

    
393
log_custom() # usage: symbol=... log_custom msg
394
{ log_indent="${log_indent//[^ ]/$symbol}" PS4="${PS4//[^ ]/$symbol}" log "$@";}
395

    
396
log_err() { symbol='#' verbosity=1 log_fd="$err_fd" log_custom "$@"; }
397

    
398
log_info() { symbol=: log_custom "$@"; }
399

    
400
die() # usage: cmd || [type=...] die msg # msg can use $? but not $()
401
{ save_e; kw_params type; "log_${type:-err}" "$1"; rethrow; }
402

    
403
die_e() # usage: cmd || [benign_error=1] die_e [|| handle error]
404
{
405
	save_e; kw_params benign_error
406
	if test "$benign_error"; then log++; fi
407
	type="${benign_error:+info}" die "command exited with \
408
$(if test "$benign_error"; then echo status; else echo error; fi) $e"
409
	rethrow
410
}
411

    
412

    
413
#### functions
414

    
415
func_exists() { declare -f "$1" >/dev/null; }
416

    
417
copy_func() # usage: from=... to=... copy_func
418
# $to must not exist. to get around the no-clobber restriction, use `unset -f`.
419
{
420
	: "${from:?}" "${to:?}"
421
	func_exists "$from" || die "function does not exist: $from"
422
	! func_exists "$to" || die "function already exists: $to"
423
	local from_def="$(declare -f "$from")"
424
	eval "$to${from_def#$from}"
425
}
426

    
427
func_override() # usage: func_override old_name__suffix
428
{ from="${1%__*}" to="$1" copy_func; }
429

    
430
ensure_nested_func() # usage: func__nested_func() { ensure_nested_func; ... }
431
{
432
	local nested_func="${FUNCNAME[1]}"
433
	local func="${nested_func%%__*}"
434
	contains "$func" "${FUNCNAME[@]}" || \
435
		die "$nested_func() must be used by $func()"
436
}
437

    
438

    
439
#### paths
440

    
441
# cache realpath
442
: "${realpath_cache=}" # default off because slower than without
443
if test "$realpath_cache"; then
444
func_override realpath__no_cache
445
realpath() # caches the last result for efficiency
446
{
447
	local cache_key="$*"; load_cache
448
	if ! cached; then save_cache "$(realpath__no_cache "$@")" || return; fi
449
	echo_cached_value
450
}
451
fi
452

    
453
rel_path() # usage: base_dir=... path=... rel_path
454
{
455
	kw_params base_dir path
456
	: "${base_dir:?}" "${path:?}"
457
	
458
	local path="$path/" # add *extra* / to match path when exactly = base_dir
459
	path="${path#$base_dir/}" # remove prefix shared with base_dir
460
	path="${path%/}" # remove any remaining extra trailing /
461
	
462
	if test ! "$path"; then path=.; fi # ensure non-empty
463
	
464
	echo_vars path
465
	echo "$path"
466
}
467

    
468
cd -P . # expand symlinks in $PWD so it matches the output of realpath
469
# do before setting $top_script_abs so realpath has less symlinks to resolve
470

    
471
canon_rel_path() # usage: [base_dir=...] canon_rel_path path
472
{
473
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
474
	base_dir="$(realpath "$base_dir")" || return
475
	local path; path="$(realpath "$1")" || return
476
	rel_path
477
}
478

    
479
canon_dir_rel_path() # usage: [base_dir=...] canon_dir_rel_path path
480
# if the path is a symlink, just its parent dir will be canonicalized
481
{
482
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
483
	base_dir="$(realpath "$base_dir")" || return
484
	local path; path="$(realpath "$(dirname "$1")")/$(basename "$1")" || return
485
	rel_path
486
}
487

    
488
# makes $1 a canon_rel_path if it's a filesystem path
489
alias cmd2rel_path="$(cat <<'EOF'
490
if test "$(type -t "$1")" = file && test -e "$1"; then # not relative to PATH
491
	declare _1="$1"; shift
492
	_1="$(clog++ canon_rel_path "$_1")" || return
493
	set -- "$_1" "$@"
494
fi
495
EOF
496
)"
497

    
498
# usage: path_parents path; use ${dirs[@]} # includes the path itself
499
function path_parents()
500
{
501
	echo_func; local path="$1" prev_path=; dirs=()
502
	while test "$path" != "$prev_path"; do
503
		prev_path="$path"
504
		dirs+=("$path")
505
		path="${path%/*}"
506
	done
507
}
508
alias path_parents='declare dirs; "path_parents"'
509

    
510

    
511
#### verbose output
512

    
513

    
514
### command echoing
515

    
516
alias echo_params='log "$*"'
517

    
518
fi # load new aliases
519
if self_being_included; then
520

    
521
echo_cmd() { echo_params; }
522

    
523
function echo_run() { echo_params; "$@"; }
524
# see echo_run alias after stub
525

    
526
echo_builtin() { echo_run builtin "$@"; } # usage: echo_builtin builtin_cmd...
527

    
528
echo_eval() { echo_params; builtin eval "$@"; }
529

    
530
# usage: redirs=(...); [cmd_name_log_inc=#] echo_redirs_cmd
531
function echo_redirs_cmd()
532
{
533
	local cmd_name_log_inc="${cmd_name_log_inc-0}"
534
	
535
	# print <>file redirs before cmd, because they introduce it
536
	"log+" "$cmd_name_log_inc" echo_cmd "$@" $(
537
		set -- "${redirs[@]}" # operate on ${redirs[@]}
538
		while test "$#" -gt 0 && starts_with '[<>][^&]' "$1"
539
		do log "$1 \\"; shift; done # log() will run *before* echo_cmd itself
540
		echo "$@"
541
	)
542
}
543
alias echo_redirs_cmd='"echo_redirs_cmd" "$@"'
544

    
545
## vars
546

    
547
echo_vars() # usage: echo_vars var...
548
{
549
	log+ 2
550
	if can_log; then
551
		local var
552
		for var in "${@%%=*}"; do
553
			if isset "$var"; then log "$(declare -p "$var")"; fi
554
		done
555
	fi
556
}
557

    
558
echo_export() { builtin export "$@"; echo_vars "$@"; }
559

    
560
alias export="echo_export" # automatically echo env vars when they are set
561

    
562
func_override kw_params__lang
563
kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
564

    
565
## functions
566

    
567
# usage: local func=...; set_func_loc; use $file, $line
568
alias set_func_loc="$(cat <<'EOF'
569
: "${func:?}"
570
local func_info="$(shopt -s extdebug; declare -F "$func")" # 'func line file'
571
func_info="${func_info#$func }"
572
local line="${func_info%% *}"
573
local file="${func_info#$line }"
574
EOF
575
)"
576

    
577
fi # load new aliases
578
if self_being_included; then
579

    
580
func_loc() # gets where function declared in the format file:line
581
{
582
	local func="$1"; set_func_loc
583
	file="$(canon_rel_path "$file")" || return
584
	echo "$file:$line"
585
}
586

    
587
# usage: func() { [minor=1] echo_func; ... }
588
function echo_func()
589
# usage: "echo_func" "$FUNCNAME" "$@" && indent || true
590
# exit status: whether function call was echoed
591
{
592
	log++; can_log || return
593
	local func="$1"; shift
594
	local loc; loc="$(clog++ func_loc "$func")" || return
595
	echo_cmd "$loc" "$func" "$@"
596
}
597
# see echo_func alias after stub
598

    
599
fi # load new aliases
600
if self_being_included; then
601

    
602

    
603
#### streams
604

    
605
fd_exists() { (: <&"$1") 2>/dev/null; }
606

    
607
require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
608
{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
609

    
610
set_fds() # usage: set_fds redirect...
611
{
612
	echo_func
613
	
614
	# add #<>&- before every #<>&# reopen to fix strange bash bug
615
	local redirs=() i
616
	for i in "$@"; do
617
		local redir_prefix="$(match_prefix '*[<>]' "$i")"
618
		if test "$redir_prefix"; then redirs+=("$redir_prefix&-"); fi
619
		redirs+=("$i")
620
	done
621
	set -- "${redirs[@]}"
622
	
623
	if (($# > 0)); then echo_eval exec "$@"; fi
624
}
625

    
626
fd_set_default() # usage: fd_set_default 'dest[<>]src'
627
{
628
	echo_func
629
	local dest="${1%%[<>]*}"
630
	require_fd_not_exists "$dest" || return 0
631
	set_fds "$1"
632
}
633

    
634
function filter_fd() # usage: (fd=# filter_fd filter_cmd...; with filter...)
635
# useful e.g. to filter logging output or highlight errors
636
{
637
	echo_func; kw_params fd; : "${fd?}"
638
	set_fds "$fd>" >(pipe_delay; redirs=(">&$fd" "${redirs[@]}"); redir "$@")
639
	pipe_delay; pipe_delay # wait for >()'s pipe_delay and initial logging
640
}
641
alias filter_fd='"filter_fd" ' # last space alias-expands next word
642

    
643
# convention: use fd 40/41/42 for command-specific alternate stdin/stdout/stderr
644
# mnemonic: 4 looks like A for Alternate
645
# do NOT use 1x, which are used by eval (which is used by set_fds())
646
# do NOT use 2x, which are used as global stdin/stdout/stderr
647
# do NOT use 3x, which are used for logging
648

    
649
setup_log_fd() # view logging output at verbosity >= 5
650
{
651
	log+ 4; log-- echo_func 
652
	fd_set_default '30>&2' || true # stdlog
653
	log_fd=30 # stdlog
654
}
655
setup_log_fd
656

    
657
set_global_fds()
658
# allows commands to access global stdin/stdout/stderr using fd 20/21/22
659
# this works even when /dev/tty isn't available
660
# view logging output at verbosity >= 3
661
{
662
	log+ 2; log-- echo_func
663
	# ignore errors if a source fd isn't open
664
	fd_set_default '20<&0' || true
665
	fd_set_default '21>&1' || true
666
	fd_set_default '22>&2' || true
667
}
668
set_global_fds
669

    
670
# usage: explicit_errors_only=1 script...
671
# show only explicitly-displayed errors (which have been redirected to fd 22)
672
# most of the time this has the same effect as `verbosity=0 script...`,
673
# which displays everything that isn't explicitly hidden
674
# this option should only be used for testing the explicit error displaying
675
if test "$explicit_errors_only"; then disable_logging; fi
676

    
677

    
678
echo_vars is_outermost
679

    
680

    
681
#### paths
682

    
683
top_symlink_dir="$(dirname "$0")"; echo_vars top_symlink_dir
684
top_symlink_dir_abs="$(realpath "$top_symlink_dir")"
685
	echo_vars top_symlink_dir_abs
686

    
687
top_script_abs="$(realpath "$0")"; echo_vars top_script_abs # outermost script
688
	# realpath this before doing any cd so this points to the right place
689
top_dir_abs="$(dirname "$top_script_abs")"; echo_vars top_dir_abs
690

    
691
set_paths()
692
{
693
	top_script="$(clog++ canon_rel_path "$top_script_abs")" || return
694
		echo_vars top_script
695
	top_dir="$(dirname "$top_script")" || return; echo_vars top_dir
696
}
697
set_paths
698

    
699
# usage: in_top_dir cmd...
700
function in_top_dir() { echo_func; (cd "$top_dir"; "$@"); }
701
alias in_top_dir='"in_top_dir" ' # last space alias-expands next word
702

    
703
PATH_rm() # usage: PATH_rm path... # removes components from the PATH
704
{
705
	echo_func; echo_vars PATH; : "${PATH?}"
706
	log+ 2
707
	split : "$PATH"
708
	local new_paths=()
709
	for path in "${parts[@]}"; do
710
		if ! contains "$path" "$@"; then new_paths+=("$path"); fi
711
	done
712
	PATH="$(delim=: join "${new_paths[@]}")" || return
713
	log- 2
714
	echo_vars PATH
715
}
716

    
717
no_PATH_recursion() # usage: (no_PATH_recursion; cmd...)
718
# allows running a system command of the same name as the script
719
{
720
	echo_func
721
	PATH_rm "$top_dir_abs" "$top_symlink_dir" "$top_symlink_dir_abs" "$top_dir"
722
}
723

    
724
# makes command in $1 nonrecursive
725
# allows running a system command of the same name as the script
726
alias cmd2abs_path="$(cat <<'EOF'
727
declare _1="$1"; shift
728
_1="$(indent; no_PATH_recursion; log++; which "$_1"|echo_stdout)" || return
729
set -- "$_1" "$@"
730
EOF
731
)"
732

    
733

    
734
#### verbose output
735

    
736

    
737
## internal commands
738

    
739
.()
740
{
741
	clog++ clog++ echo_func
742
	cmd2rel_path; set -- "$FUNCNAME" "$@"
743
	if (log++; echo_params; can_log); then indent; fi
744
	builtin "$@"
745
}
746

    
747
.rel() # usage: .rel file [args...] # file relative to ${BASH_SOURCE[0]} dir
748
{
749
	clog++ clog++ echo_func; local file="$1"; shift
750
	. "$(canon_rel_path "$(dirname "$(realpath "${BASH_SOURCE[1]}")")/$file")" \
751
"$@"
752
}
753

    
754
cd() # indent is permanent within subshell cd was used in
755
{
756
	log++ echo_func
757
	cmd2rel_path; echo_cmd "$FUNCNAME" "$@"
758
	if can_log; then caller_indent; fi
759
	# -P: expand symlinks so $PWD matches the output of realpath
760
	builtin "$FUNCNAME" -P "$@"
761
	
762
	func=realpath clear_cache
763
	set_paths
764
}
765

    
766
## external commands
767

    
768
disable_logging() { set_fds "$log_fd>/dev/null"; }
769

    
770
function redir() # usage: local redirs=(#<>...); redir cmd...; unset redirs
771
# to view only explicitly-displayed errors: explicit_errors_only=1 script...
772
{
773
	echo_func; kw_params redirs
774
	
775
	case "$1" in redir|command) "$@"; return;; esac # redir will be run later
776
	(
777
		log++ set_fds "${redirs[@]}"
778
		(case "$1" in command__exec) shift;; esac; echo_redirs_cmd)
779
		"$@"
780
	) || return
781
}
782
alias redir='"redir" ' # last space alias-expands next word
783

    
784
alias_append save_e '; unset redirs' # don't redirect error handlers
785

    
786
fi # load new aliases
787
if self_being_included; then
788

    
789
command() # usage: [cmd_log_fd=|1|2|#] [verbosity_min=] [nonrecursive=1] \
790
# command extern_cmd...
791
{
792
	echo_func; kw_params log_fd cmd_log_fd redirs verbosity_min
793
	# if no cmd_log_fd, limit log_fd in case command uses util.sh
794
	local cmd_log_fd="${cmd_log_fd-$log_fd}"
795
	local redirs=("${redirs[@]}")
796
	
797
	# determine redirections
798
	if test "$cmd_log_fd"; then
799
		if can_log; then
800
			if test "$cmd_log_fd" != "$log_fd"; then
801
				redirs+=("$cmd_log_fd>&$log_fd")
802
			fi # else no redir needed
803
		else redirs+=("$cmd_log_fd>/dev/null");
804
		fi
805
	fi
806
	
807
	if test "$nonrecursive"; then cmd2abs_path; else cmd2rel_path; fi
808
	redir command__exec "$@" || die_e
809
}
810
command__exec()
811
{
812
	ensure_nested_func
813
	if can_log; then indent; fi
814
	if test "$verbosity_min"; then verbosity_min "$verbosity_min"; fi
815
	verbosity_compat
816
	builtin command "$@"
817
}
818

    
819

    
820
### external command input/output
821

    
822
echo_stdin() # usage: input|echo_stdin|cmd
823
{
824
	if can_log; then
825
		pipe_delay
826
		echo ----- >&"$log_fd"
827
		tee -a /dev/fd/"$log_fd";
828
		echo ----- >&"$log_fd"
829
	else cat
830
	fi
831
}
832

    
833
echo_stdout() { echo_stdin; } # usage: cmd|echo_stdout
834

    
835

    
836
#### commands
837

    
838
already_exists_msg() # usage: cond || what=... already_exists_msg || return 0
839
{ type=info die "$what already exists, skipping"; }
840

    
841
require_not_exists() # usage: require_not_exists file || return 0
842
{ test ! -e "$1" || what="file \"$1\"" already_exists_msg; }
843

    
844
function to_file() # usage: stdout=... [if_not_exists=1] [del=] to_file cmd...
845
# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
846
{
847
	echo_func; kw_params stdout if_not_exists del
848
	: "${stdout?}"; local del="${del-1}"
849
	if test "$if_not_exists"; then require_not_exists "$stdout" || return 0; fi
850
	
851
	local redirs=("${redirs[@]}" ">$stdout")
852
	redir "$@" || { save_e; test ! "$del" || rm "$stdout"; rethrow; }
853
}
854
alias to_file='"to_file" ' # last space alias-expands next word
855

    
856
log_bg() { symbol='&' log_custom "$@"; }
857

    
858
log_last_bg() { log_bg '$!='"$!"; }
859

    
860
function bg_cmd() { echo_func; "$@" & log_last_bg; } # usage: bg_cmd cmd...
861
alias bg_cmd='"bg_cmd" ' # last space alias-expands next word
862

    
863
run_args_cmd() # runs the command line args command
864
{
865
	eval set -- "$(reverse "${BASH_ARGV[@]}")"
866
	test $# -ge 1 || set -- all
867
	echo_cmd "$top_script" "$@"; time "$@"
868
}
869

    
870
fwd() # usage: subdirs=(...); fwd "$FUNCNAME" "$@"
871
{
872
	echo_func
873
	: "${subdirs?}"
874
	
875
	for subdir in "${subdirs[@]}"; do "$top_dir"/"$subdir"/run "$@"; done
876
}
877

    
878

    
879
#### filesystem
880

    
881
alias mkdir='mkdir -p'
882

    
883
alias file_size=\
884
"stat `case "$(uname)" in Darwin) echo -f %z;; *) echo --format=%s;; esac`"
885

    
886
alias wildcard='shopt -s nullglob; echo' # usage: "$(wildcard glob...)"
887
alias wildcard1='shopt -s nullglob; echo1' # usage: "$(wildcard1 glob...)"
888

    
889
fi # load new aliases
890
if self_being_included; then
891

    
892
mv2dir() { echo_func; mkdir "${!#}"; mv "$@"; } # usage: mv2dir ... dir
893

    
894
# usage: (mv_glob ... dir)
895
function mv_glob() { echo_func; if (($# > 1)); then mv2dir "$@"; fi; }
896
alias mv_glob='shopt -s nullglob; "mv_glob"'
897

    
898

    
899
#### URLs
900

    
901
localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
902

    
903
fi
(10-10/11)