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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" "$@"
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EOF
133
)"
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fi # load new aliases
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if self_being_included; then
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sys_cmd() { cmd2sys; command "$@"; } # 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 "$@"; }
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# usage: cmd=... foreach_arg
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function foreach_arg()
150
{
151
	echo_func; kw_params cmd; : "${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
179
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#$1}}"; fi }
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repeat() # usage: str=... n=... repeat
242
{
243
	: "${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
245
	echo "$result"
246
}
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sed_cmd="sed -`case "$(uname)" in Darwin) echo E;; *) echo r;; esac`"
249
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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echo1() { echo "$1"; } # usage: echo1 values...
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# usage: split delim str; use ${parts[@]}
262
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...))
268
{
269
	local i
270
	for (( i=$#; i > 0; i-- )); do printf '%q ' "${!i}"; done
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}
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273
contains() # usage: contains value in_array...
274
{
275
	local value="$1"; shift
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	local elem
277
	for elem in "$@"; do if test "$elem" = "$value"; then return 0; fi; done
278
	return 1
279
}
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#### streams
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pipe_delay() # usage: cmd1 | { pipe_delay; cmd2; }
284
{ sleep 0.1; } # s; display after leading output of cmd1
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#### verbose output
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290
err_fd=2 # stderr
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292
usage() { echo "Usage: $1" >&2; return 2; }
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### log++
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297
log_fd=2 # initially stderr
298

    
299
if test "$explicit_errors_only"; then verbosity=0; fi # hide startup logging
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# set verbosity
302
if isset verbose; then : "${verbosity:=$(bool2int "$verbose")}"; fi
303
if isset vb; then : "${verbosity:=$vb}"; fi
304
: "${verbosity=1}" # default
305
: "${verbosity:=0}" # ensure non-empty
306
export verbosity # propagate to invoked commands
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export PS4 # follows verbosity, so also propagate this
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is_outermost="$(! isset log_level; exit2bool)" # if util.sh env not yet set up
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# set log_level
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: "${log_level=$(( ${#PS4}-1 ))}" # defaults to # non-space symbols in PS4
313
export log_level # propagate to invoked commands
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verbosity_int() { round_down "$verbosity"; }
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317
# verbosities (and `make` equivalents):
318
# 0: just print errors. useful for cron jobs.
319
#    vs. make: equivalent to --silent, but suppresses external command output
320
# 1: also external commands run. useful for running at the command line.
321
#    vs. make: not provided (but sorely needed to avoid excessive output)
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# 2: full graphical call tree. useful for determining where error occurred.
323
#    vs. make: equivalent to default verbosity, but with much-needed indents
324
# 3: also values of kw params and variables. useful for low-level debugging.
325
#    vs. make: not provided; need to manually use $(error $(var))
326
# 4: also variables in util.sh commands. useful for debugging util.sh.
327
#    vs. make: somewhat similar to --print-data-base
328
# 5: also variables in logging commands themselves. useful for debugging echo_*.
329
#    vs. make: not provided; need to search Makefile for @ at beginning of cmd
330
# 6+: not currently used (i.e. same as 5)
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# definition: the log_level is the minimum verbosity needed to display a message
333
# for messages that use can_log(), the log_level starts with *1*, not 0
334
# for unfiltered messages, the log_level is 0 (i.e. still output at verbosity=0)
335
# to view a message's log_level, count the # of + signs before it in the output
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fi # load new aliases
338
if self_being_included; then
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340
# usage: in func:      log++; ...         OR  log_local; "log++"; ...
341
#        outside func: log++; ...; log--
342
#        before cmd:  "log++" cmd  OR  "log+" # cmd  OR  "log++" "log++" cmd
343
# with a cmd, assignments are applied just to it, so log_local is not needed
344
# without a cmd, "$@" expands to nothing and assignments are applied to caller
345
# "${@:2}" expands to all of $@ after *1st* arg, not 2nd ($@ indexes start at 1)
346
log+()
347
{
348
	# no local vars because w/o cmd, assignments should be applied to caller
349
	PS4="$(str="${PS4:0:1}" n=$((log_level+$1-1)) repeat)${PS4: -2}"; \
350
	log_level=$((log_level+$1)) \
351
	verbosity="$(float+int "$verbosity" "-$1")" "${@:2}"
352
}
353
log-() { log+ "-$1" "${@:2}"; }
354
log++() { log+ 1 "$@"; }
355
log--() { log- 1 "$@"; }
356
alias log_local=\
357
'declare PS4="$PS4" log_level="$log_level" verbosity="$verbosity"'
358
alias log+='log_local; "log+"' # don't expand next word because it's not a cmd
359
alias log++='log_local; "log++" ' # last space alias-expands next word
360
alias log--='log_local; "log--" ' # last space alias-expands next word
361
# no clog+ alias because next word is not a cmd
362
alias clog++='"log++" ' # last space alias-expands next word
363
alias clog--='"log--" ' # last space alias-expands next word
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365
verbosity_min() # usage: verbosity_min {min|} # ''->verbosity=''
366
{ if test ! "$1" -o "$(verbosity_int)" -lt "$1"; then verbosity="$1"; fi; }
367
alias verbosity_min='log_local; "verbosity_min"'
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369
# usage: (verbosity_compat; cmd)
370
function verbosity_compat()
371
{ echo_func; if ((verbosity == 1)); then unset verbosity; fi; }
372
alias verbosity_compat='declare verbosity; "verbosity_compat"'
373

    
374

    
375
# indent for call tree. this is *not* the log_level (below).
376
: "${log_indent_step=| }" "${log_indent=}"
377
export log_indent_step log_indent # propagate to invoked commands
378

    
379
# see indent alias in stubs
380

    
381

    
382
fi # load new aliases
383
if self_being_included; then
384

    
385
can_log() { test "$(verbosity_int)" -gt 0; }
386
	# verbosity=0 turns off all logging
387

    
388
log() { if can_log; then echo "$log_indent$PS4$1" >&"$log_fd"; fi; }
389

    
390
log_custom() # usage: symbol=... log_custom msg
391
{ log_indent="${log_indent//[^ ]/$symbol}" PS4="${PS4//[^ ]/$symbol}" log "$@";}
392

    
393
log_err() { symbol='#' verbosity=1 log_fd="$err_fd" log_custom "$@"; }
394

    
395
log_info() { symbol=: log_custom "$@"; }
396

    
397
die() # usage: cmd || [type=...] die msg # msg can use $? but not $()
398
{ save_e; kw_params type; "log_${type:-err}" "$1"; rethrow; }
399

    
400
die_e() # usage: cmd || [benign_error=1] die_e [|| handle error]
401
{
402
	save_e; kw_params benign_error
403
	if test "$benign_error"; then log++; fi
404
	type="${benign_error:+info}" die "command exited with \
405
$(if test "$benign_error"; then echo status; else echo error; fi) $e"
406
	rethrow
407
}
408

    
409

    
410
#### functions
411

    
412
func_exists() { declare -f "$1" >/dev/null; }
413

    
414
copy_func() # usage: from=... to=... copy_func
415
# $to must not exist. to get around the no-clobber restriction, use `unset -f`.
416
{
417
	: "${from:?}" "${to:?}"
418
	func_exists "$from" || die "function does not exist: $from"
419
	! func_exists "$to" || die "function already exists: $to"
420
	local from_def="$(declare -f "$from")"
421
	eval "$to${from_def#$from}"
422
}
423

    
424
func_override() # usage: func_override old_name__suffix
425
{ from="${1%__*}" to="$1" copy_func; }
426

    
427
ensure_nested_func() # usage: func__nested_func() { ensure_nested_func; ... }
428
{
429
	local nested_func="${FUNCNAME[1]}"
430
	local func="${nested_func%%__*}"
431
	contains "$func" "${FUNCNAME[@]}" || \
432
		die "$nested_func() must be used by $func()"
433
}
434

    
435

    
436
#### paths
437

    
438
# cache realpath
439
: "${realpath_cache=}" # default off because slower than without
440
if test "$realpath_cache"; then
441
func_override realpath__no_cache
442
realpath() # caches the last result for efficiency
443
{
444
	local cache_key="$*"; load_cache
445
	if ! cached; then save_cache "$(realpath__no_cache "$@")" || return; fi
446
	echo_cached_value
447
}
448
fi
449

    
450
rel_path() # usage: base_dir=... path=... rel_path
451
{
452
	kw_params base_dir path
453
	: "${base_dir:?}" "${path:?}"
454
	
455
	local path="$path/" # add *extra* / to match path when exactly = base_dir
456
	path="${path#$base_dir/}" # remove prefix shared with base_dir
457
	path="${path%/}" # remove any remaining extra trailing /
458
	
459
	if test ! "$path"; then path=.; fi # ensure non-empty
460
	
461
	echo_vars path
462
	echo "$path"
463
}
464

    
465
cd -P . # expand symlinks in $PWD so it matches the output of realpath
466
# do before setting $top_script_abs so realpath has less symlinks to resolve
467

    
468
canon_rel_path() # usage: [base_dir=...] canon_rel_path path
469
{
470
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
471
	base_dir="$(realpath "$base_dir")" || return
472
	local path; path="$(realpath "$1")" || return
473
	rel_path
474
}
475

    
476
canon_dir_rel_path() # usage: [base_dir=...] canon_dir_rel_path path
477
# if the path is a symlink, just its parent dir will be canonicalized
478
{
479
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
480
	base_dir="$(realpath "$base_dir")" || return
481
	local path; path="$(realpath "$(dirname "$1")")/$(basename "$1")" || return
482
	rel_path
483
}
484

    
485
# makes $1 a canon_rel_path if it's a filesystem path
486
alias cmd2rel_path="$(cat <<'EOF'
487
if test "$(type -t "$1")" = file && test -e "$1"; then # not relative to PATH
488
	declare _1="$1"; shift
489
	_1="$(clog++ canon_rel_path "$_1")" || return
490
	set -- "$_1" "$@"
491
fi
492
EOF
493
)"
494

    
495
# usage: path_parents path; use ${dirs[@]} # includes the path itself
496
function path_parents()
497
{
498
	echo_func; local path="$1" prev_path=; dirs=()
499
	while test "$path" != "$prev_path"; do
500
		prev_path="$path"
501
		dirs+=("$path")
502
		path="${path%/*}"
503
	done
504
}
505
alias path_parents='declare dirs; "path_parents"'
506

    
507

    
508
#### verbose output
509

    
510

    
511
### command echoing
512

    
513
alias echo_params='log "$*"'
514

    
515
fi # load new aliases
516
if self_being_included; then
517

    
518
echo_cmd() { echo_params; }
519

    
520
function echo_run() { echo_params; "$@"; }
521
# see echo_run alias after stub
522

    
523
echo_builtin() { echo_run builtin "$@"; } # usage: echo_builtin builtin_cmd...
524

    
525
echo_eval() { echo_params; builtin eval "$@"; }
526

    
527
# usage: redirs=(...); [cmd_name_log_inc=#] echo_redirs_cmd
528
function echo_redirs_cmd()
529
{
530
	local cmd_name_log_inc="${cmd_name_log_inc-0}"
531
	
532
	# print <>file redirs before cmd, because they introduce it
533
	"log+" "$cmd_name_log_inc" echo_cmd "$@" $(
534
		set -- "${redirs[@]}" # operate on ${redirs[@]}
535
		while test "$#" -gt 0 && starts_with '[<>][^&]' "$1"
536
		do log "$1 \\"; shift; done # log() will run *before* echo_cmd itself
537
		echo "$@"
538
	)
539
}
540
alias echo_redirs_cmd='"echo_redirs_cmd" "$@"'
541

    
542
## vars
543

    
544
echo_vars() # usage: echo_vars var...
545
{
546
	log+ 2
547
	if can_log; then
548
		local var
549
		for var in "${@%%=*}"; do
550
			if isset "$var"; then log "$(declare -p "$var")"; fi
551
		done
552
	fi
553
}
554

    
555
echo_export() { builtin export "$@"; echo_vars "$@"; }
556

    
557
alias export="echo_export" # automatically echo env vars when they are set
558

    
559
func_override kw_params__lang
560
kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
561

    
562
## functions
563

    
564
# usage: local func=...; set_func_loc; use $file, $line
565
alias set_func_loc="$(cat <<'EOF'
566
: "${func:?}"
567
local func_info="$(shopt -s extdebug; declare -F "$func")" # 'func line file'
568
func_info="${func_info#$func }"
569
local line="${func_info%% *}"
570
local file="${func_info#$line }"
571
EOF
572
)"
573

    
574
fi # load new aliases
575
if self_being_included; then
576

    
577
func_loc() # gets where function declared in the format file:line
578
{
579
	local func="$1"; set_func_loc
580
	file="$(canon_rel_path "$file")" || return
581
	echo "$file:$line"
582
}
583

    
584
# usage: func() { [minor=1] echo_func; ... }
585
function echo_func()
586
# usage: "echo_func" "$FUNCNAME" "$@" && indent || true
587
# exit status: whether function call was echoed
588
{
589
	log++; can_log || return
590
	local func="$1"; shift
591
	local loc; loc="$(clog++ func_loc "$func")" || return
592
	echo_cmd "$loc" "$func" "$@"
593
}
594
# see echo_func alias after stub
595

    
596
fi # load new aliases
597
if self_being_included; then
598

    
599

    
600
#### streams
601

    
602
fd_exists() { (: <&"$1") 2>/dev/null; }
603

    
604
require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
605
{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
606

    
607
set_fds() # usage: set_fds redirect...
608
{
609
	echo_func
610
	
611
	# add #<>&- before every #<>&# reopen to fix strange bash bug
612
	local redirs=() i
613
	for i in "$@"; do
614
		local redir_prefix="$(match_prefix '*[<>]' "$i")"
615
		if test "$redir_prefix"; then redirs+=("$redir_prefix&-"); fi
616
		redirs+=("$i")
617
	done
618
	set -- "${redirs[@]}"
619
	
620
	if (($# > 0)); then echo_eval exec "$@"; fi
621
}
622

    
623
fd_set_default() # usage: fd_set_default 'dest[<>]src'
624
{
625
	echo_func
626
	local dest="${1%%[<>]*}"
627
	require_fd_not_exists "$dest" || return 0
628
	set_fds "$1"
629
}
630

    
631
function filter_fd() # usage: (fd=# filter_fd filter_cmd...; with filter...)
632
# useful e.g. to filter logging output or highlight errors
633
{
634
	echo_func; kw_params fd; : "${fd?}"
635
	set_fds "$fd>" >(pipe_delay; redirs=(">&$fd" "${redirs[@]}"); redir "$@")
636
	pipe_delay; pipe_delay # wait for >()'s pipe_delay and initial logging
637
}
638
alias filter_fd='"filter_fd" ' # last space alias-expands next word
639

    
640
# convention: use fd 40/41/42 for command-specific alternate stdin/stdout/stderr
641
# mnemonic: 4 looks like A for Alternate
642
# do NOT use 1x, which are used by eval (which is used by set_fds())
643
# do NOT use 2x, which are used as global stdin/stdout/stderr
644
# do NOT use 3x, which are used for logging
645

    
646
setup_log_fd() # view logging output at verbosity >= 5
647
{
648
	log+ 4; log-- echo_func 
649
	fd_set_default '30>&2' || true # stdlog
650
	log_fd=30 # stdlog
651
}
652
setup_log_fd
653

    
654
set_global_fds()
655
# allows commands to access global stdin/stdout/stderr using fd 20/21/22
656
# this works even when /dev/tty isn't available
657
# view logging output at verbosity >= 3
658
{
659
	log+ 2; log-- echo_func
660
	# ignore errors if a source fd isn't open
661
	fd_set_default '20<&0' || true
662
	fd_set_default '21>&1' || true
663
	fd_set_default '22>&2' || true
664
}
665
set_global_fds
666

    
667
# usage: explicit_errors_only=1 script...
668
# show only explicitly-displayed errors (which have been redirected to fd 22)
669
# most of the time this has the same effect as `verbosity=0 script...`,
670
# which displays everything that isn't explicitly hidden
671
# this option should only be used for testing the explicit error displaying
672
if test "$explicit_errors_only"; then disable_logging; fi
673

    
674

    
675
echo_vars is_outermost
676

    
677

    
678
#### paths
679

    
680
top_symlink_dir="$(dirname "$0")"; echo_vars top_symlink_dir
681
top_symlink_dir_abs="$(realpath "$top_symlink_dir")"
682
	echo_vars top_symlink_dir_abs
683

    
684
top_script_abs="$(realpath "$0")"; echo_vars top_script_abs # outermost script
685
	# realpath this before doing any cd so this points to the right place
686
top_dir_abs="$(dirname "$top_script_abs")"; echo_vars top_dir_abs
687

    
688
set_paths()
689
{
690
	top_script="$(clog++ canon_rel_path "$top_script_abs")" || return
691
		echo_vars top_script
692
	top_dir="$(dirname "$top_script")" || return; echo_vars top_dir
693
}
694
set_paths
695

    
696
# usage: in_top_dir cmd...
697
function in_top_dir() { echo_func; (cd "$top_dir"; "$@"); }
698
alias in_top_dir='"in_top_dir" ' # last space alias-expands next word
699

    
700
PATH_rm() # usage: PATH_rm path... # removes components from the PATH
701
{
702
	echo_func; echo_vars PATH; : "${PATH?}"
703
	log+ 2
704
	split : "$PATH"
705
	local new_paths=()
706
	for path in "${parts[@]}"; do
707
		if ! contains "$path" "$@"; then new_paths+=("$path"); fi
708
	done
709
	PATH="$(delim=: join "${new_paths[@]}")" || return
710
	log- 2
711
	echo_vars PATH
712
}
713

    
714
no_PATH_recursion() # usage: (no_PATH_recursion; cmd...)
715
# allows running a system command of the same name as the script
716
{
717
	echo_func
718
	PATH_rm "$top_dir_abs" "$top_symlink_dir" "$top_symlink_dir_abs" "$top_dir"
719
}
720

    
721
# makes command in $1 nonrecursive
722
# allows running a system command of the same name as the script
723
alias cmd2abs_path="$(cat <<'EOF'
724
declare _1="$1"; shift
725
_1="$(indent; no_PATH_recursion; log++; which "$_1"|echo_stdout)" || return
726
set -- "$_1" "$@"
727
EOF
728
)"
729

    
730

    
731
#### verbose output
732

    
733

    
734
## internal commands
735

    
736
.()
737
{
738
	clog++ clog++ echo_func
739
	cmd2rel_path; set -- "$FUNCNAME" "$@"
740
	if (log++; echo_params; can_log); then indent; fi
741
	builtin "$@"
742
}
743

    
744
.rel() # usage: .rel file [args...] # file relative to ${BASH_SOURCE[0]} dir
745
{
746
	clog++ clog++ echo_func; local file="$1"; shift
747
	. "$(canon_rel_path "$(dirname "$(realpath "${BASH_SOURCE[1]}")")/$file")" \
748
"$@"
749
}
750

    
751
cd() # indent is permanent within subshell cd was used in
752
{
753
	log++ echo_func
754
	cmd2rel_path; echo_cmd "$FUNCNAME" "$@"
755
	if can_log; then caller_indent; fi
756
	# -P: expand symlinks so $PWD matches the output of realpath
757
	builtin "$FUNCNAME" -P "$@"
758
	
759
	func=realpath clear_cache
760
	set_paths
761
}
762

    
763
## external commands
764

    
765
disable_logging() { set_fds "$log_fd>/dev/null"; }
766

    
767
function redir() # usage: local redirs=(#<>...); redir cmd...; unset redirs
768
# to view only explicitly-displayed errors: explicit_errors_only=1 script...
769
{
770
	echo_func; kw_params redirs
771
	
772
	case "$1" in redir|command) "$@"; return;; esac # redir will be run later
773
	(
774
		log++ set_fds "${redirs[@]}"
775
		(case "$1" in command__exec) shift;; esac; echo_redirs_cmd)
776
		"$@"
777
	) || return
778
}
779
alias redir='"redir" ' # last space alias-expands next word
780

    
781
alias_append save_e '; unset redirs' # don't redirect error handlers
782

    
783
fi # load new aliases
784
if self_being_included; then
785

    
786
command() # usage: [cmd_log_fd=|1|2|#] [verbosity_min=] [nonrecursive=1] \
787
# command extern_cmd...
788
{
789
	echo_func; kw_params log_fd cmd_log_fd redirs verbosity_min
790
	# if no cmd_log_fd, limit log_fd in case command uses util.sh
791
	local cmd_log_fd="${cmd_log_fd-$log_fd}"
792
	local redirs=("${redirs[@]}")
793
	
794
	# determine redirections
795
	if test "$cmd_log_fd"; then
796
		if can_log; then
797
			if test "$cmd_log_fd" != "$log_fd"; then
798
				redirs+=("$cmd_log_fd>&$log_fd")
799
			fi # else no redir needed
800
		else redirs+=("$cmd_log_fd>/dev/null");
801
		fi
802
	fi
803
	
804
	if test "$nonrecursive"; then cmd2abs_path; else cmd2rel_path; fi
805
	redir command__exec "$@" || die_e
806
}
807
command__exec()
808
{
809
	ensure_nested_func
810
	if can_log; then indent; fi
811
	if test "$verbosity_min"; then verbosity_min "$verbosity_min"; fi
812
	verbosity_compat
813
	builtin command "$@"
814
}
815

    
816

    
817
### external command input/output
818

    
819
echo_stdin() # usage: input|echo_stdin|cmd
820
{
821
	if can_log; then
822
		pipe_delay
823
		echo ----- >&"$log_fd"
824
		tee -a /dev/fd/"$log_fd";
825
		echo ----- >&"$log_fd"
826
	else cat
827
	fi
828
}
829

    
830
echo_stdout() { echo_stdin; } # usage: cmd|echo_stdout
831

    
832

    
833
#### commands
834

    
835
already_exists_msg() # usage: cond || what=... already_exists_msg || return 0
836
{ type=info die "$what already exists, skipping"; }
837

    
838
require_not_exists() # usage: require_not_exists file || return 0
839
{ test ! -e "$1" || what="file \"$1\"" already_exists_msg; }
840

    
841
function to_file() # usage: stdout=... [if_not_exists=1] [del=] to_file cmd...
842
# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
843
{
844
	echo_func; kw_params stdout if_not_exists del
845
	: "${stdout?}"; local del="${del-1}"
846
	if test "$if_not_exists"; then require_not_exists "$stdout" || return 0; fi
847
	
848
	local redirs=("${redirs[@]}" ">$stdout")
849
	redir "$@" || { save_e; test ! "$del" || rm "$stdout"; rethrow; }
850
}
851
alias to_file='"to_file" ' # last space alias-expands next word
852

    
853
log_bg() { symbol='&' log_custom "$@"; }
854

    
855
log_last_bg() { log_bg '$!='"$!"; }
856

    
857
function bg_cmd() { echo_func; "$@" & log_last_bg; } # usage: bg_cmd cmd...
858
alias bg_cmd='"bg_cmd" ' # last space alias-expands next word
859

    
860
run_args_cmd() # runs the command line args command
861
{
862
	eval set -- "$(reverse "${BASH_ARGV[@]}")"
863
	test $# -ge 1 || set -- all
864
	echo_cmd "$top_script" "$@"; time "$@"
865
}
866

    
867
fwd() # usage: subdirs=(...); fwd "$FUNCNAME" "$@"
868
{
869
	echo_func
870
	: "${subdirs?}"
871
	
872
	for subdir in "${subdirs[@]}"; do "$top_dir"/"$subdir"/run "$@"; done
873
}
874

    
875

    
876
#### filesystem
877

    
878
alias mkdir='mkdir -p'
879

    
880
alias file_size=\
881
"stat `case "$(uname)" in Darwin) echo -f %z;; *) echo --format=%s;; esac`"
882

    
883
alias wildcard='shopt -s nullglob; echo' # usage: "$(wildcard glob...)"
884
alias wildcard1='shopt -s nullglob; echo1' # usage: "$(wildcard1 glob...)"
885

    
886
fi # load new aliases
887
if self_being_included; then
888

    
889
mv2dir() { echo_func; mkdir "${!#}"; mv "$@"; } # usage: mv2dir ... dir
890

    
891
# usage: (mv_glob ... dir)
892
function mv_glob() { echo_func; if (($# > 1)); then mv2dir "$@"; fi; }
893
alias mv_glob='shopt -s nullglob; "mv_glob"'
894

    
895

    
896
#### URLs
897

    
898
localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
899

    
900
fi
(10-10/11)