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#!/bin/bash -e
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set -o errexit -o pipefail # errexit in case caller's #! line missing -e
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if test ! "$_util_sh_include_guard_utils"; then
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_util_sh_include_guard_utils=1
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isset() { 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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# allow setting vars in the last command of a pipeline
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shopt -s lastpipe 2>/dev/null || true # ignore errors if not supported (on Mac)
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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 $cmd"; done; unset cmd
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echo_builtin() { :; }
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function echo_vars() { :; }
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#### debugging
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dp() { echo "$@" >&2; } # usage: pv var... # debug-prints message
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#### logic
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not() { ! "$@"; } # usage: wrapper_cmd not wrapped_cmd... # inverts exit status
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#### vars
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alias local_array='declare'
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	# `local` does not support arrays in older versions of bash
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	# don't need -a because that it's an array is autodetected by the ()
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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 "${!1}" || echo 1)"; }
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# usage: local var=...; local_inv
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alias local_inv=\
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'declare "no_$var=$(test "${!var}" || echo 1)"; echo_vars no_$var'
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unexport() { export -n "$@"; }
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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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alias export_array='declare -x'
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	# `export` does not support arrays in older versions of bash
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	# don't need -a because that it's an array is autodetected by the ()
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# to make export only visible locally: local var="$var"; export var
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# within cmd: var="$var" cmd...
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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=${!dest_var-${!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")"'"$2"';} #usage: alias_append alias '; cmd'
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#### commands
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is_callable() { type -t "$@" >/dev/null; }
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is_dot_script() { echo_func; test "${BASH_LINENO[${#BASH_LINENO[@]}-1]}" != 0; }
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require_dot_script() # usage: require_dot_script || return
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{
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	echo_func
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	if ! is_dot_script; then # was run without initial "."
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		echo "usage: . $top_script (note initial \".\")"|fold -s >&2
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		return 2
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	fi
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}
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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; log++ 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 "$@"; do
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		a="$(log++ 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 "$(self_name)"' # wrapper() { self_sys ...; }
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pv() { declare -p "$@" >&2; } # usage: pv var... # debug-prints var(s)
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pf() { declare -f "$@" >&2; } # usage: pf function # debug-prints func decl
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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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# **WARNING**: if using this after a command that might succeed (rather than
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# only upon error), you must `unset e` before the command
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# idempotent: also works if save_e already called
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alias save_e='# idempotent: use $e if the caller already called save_e
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declare e_=$?;
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declare e="$(if test "$e_" = 0; then echo "${e:-0}"; else echo "$e_"; fi)"'
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alias rethrow!='return "$e"'
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	# can't use `(exit "$e")` because a bug in bash prevents subshells from
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	# triggering errexit (would need to append `|| return` for it to work)
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alias rethrow_exit!='exit "$e"'
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alias rethrow='{ if test "$e" != 0; then rethrow!; fi; }'
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alias rethrow_exit='{ if test "$e" != 0; then rethrow_exit!; fi; }'
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alias rethrow_subshell='rethrow_exit'
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fi # load new aliases
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if self_being_included; then
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# usage: try cmd...; ignore_e status; if catch status; then ...; fi; end_try
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alias prep_try='declare e=0' # last space alias-expands next word
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# usage: ...; try cmd... # *MUST* be at beginning of statement
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#     OR prep_try; wrapper "try" cmd...
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function try() { benign_error=1 "$@" || { export_e; true; }; }
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alias try='prep_try; "try" ' # last space alias-expands next word
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catch() { test "$e" = "${1:-0}" && e=0; } # also works w/ $1=''
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ignore_e() { catch "$@" || true; } # also works w/ $1=''
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alias end_try='rethrow'
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alias end_try_subshell='rethrow_subshell'
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ignore() { save_e; ignore_e "$@"; 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#$1}}"; fi }
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rm_prefix() { echo "${2#$1}"; } # usage: rm_prefix pattern str
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repeat() # usage: str=... n=... repeat
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{
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	: "${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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# usage: outer_cmd $sed_cmd ...
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sed_cmd="env LANG= sed -`case "$(uname)" in Darwin) echo El;; *) echo ru;;esac`"
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	# LANG: avoid invalid UTF-8 "illegal byte sequence" errors when LANG=*.UTF-8
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	# -l: line buffered / -u: unbuffered
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alias sed="$sed_cmd"
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	# can't be function because this causes segfault in redir() subshell when
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	# used with make.sh make() filter
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fi # load new aliases
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if self_being_included; then
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rtrim() { log_local; log+ 3; sed 's/[[:space:]]+$//' <<<"$1"; }
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#### arrays
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echo1() { echo "$1"; } # usage: echo1 values...
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esc_args() # usage: array=($(log++; prep_env... (eg. cd); esc_args args...))
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{ local arg; for arg in "$@"; do printf '%q ' "$arg"; done; }
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# usage: split delim str; use ${parts[@]}
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function split() { local IFS="$1"; parts=($2); echo_vars parts; }
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	# no echo_func because used by log++
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alias split='declare parts; "split"'
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join() { local IFS="$delim"; echo "$*"; } # usage: delim=char join elems...
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reverse() # usage: array=($(reverse args...))
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{
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	local i
338
	for (( i=$#; i > 0; i-- )); do printf '%q ' "${!i}"; done
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}
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contains() # usage: contains value in_array...
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{
343
	local value="$1"; shift
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	local elem
345
	for elem in "$@"; do if test "$elem" = "$value"; then return 0; fi; done
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	return 1
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}
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is_array() # handles unset vars (=false)
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{
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	isset "$1" || return 1
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	local decl; decl="$(declare -p "$1")" || return; echo_vars decl
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	starts_with 'declare -a' "$decl" # also matches -ax
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}
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#### text
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fi # load new aliases
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if self_being_included; then
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nl='
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'
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# usage: split_lines str; use ${lines[@]}
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function split_lines() { split "$nl" "$1"; lines=("${parts[@]}"); }
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	# no echo_func because used by log++
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alias split_lines='declare lines; "split_lines"'
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#### paths
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strip/() { echo "${1%/}"; } # strips trailing /s
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wildcard/() # usage: array=($(log++; [cd ...;] wildcard/ unquoted_pattern...))
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{ cmd=strip/ foreach_arg; esc_args "$@"; }
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wildcard.() # usage: array=($(log++; [cd ...;] wildcard. unquoted_pattern...))
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# currently only removes . .. at beginning of list
380
{
381
	set -- $(wildcard/ "$@") # first strip trailing /s
382
	local to_rm=(. ..)
383
	local item
384
	if contains "$1" "${to_rm[@]}"; then
385
		shift
386
		if contains "$1" "${to_rm[@]}"; then shift; fi
387
	fi
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	esc_args "$@"
389
}
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#### streams
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pipe_delay() # usage: cmd1 | { pipe_delay; cmd2; }
394
{ sleep 0.1; } # s; display after leading output of cmd1
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#### verbose output
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err_fd=2 # stderr
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402
usage() { echo "Usage: $1" >&2; return 2; }
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### log++
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log_fd=2 # initially stderr
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if test "$explicit_errors_only"; then verbosity=0; fi # hide startup logging
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# set verbosity
412
if isset verbose; then : "${verbosity:=$(bool2int "$verbose")}"; fi
413
if isset vb; then : "${verbosity:=$vb}"; fi
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: "${verbosity=1}" # default
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: "${verbosity:=0}" # ensure non-empty
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export verbosity # propagate to invoked commands
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is_outermost="$(! isset log_level; exit2bool)" # if util.sh env not yet set up
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# set log_level
421
: "${log_level=$(( ${#PS4}-1 ))}" # defaults to # non-space symbols in PS4
422
export log_level # propagate to invoked commands
423
export PS4 # follows log_level, so also propagate this
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verbosity_int() { round_down "$verbosity"; }
426

    
427
# verbosities (and `make` equivalents):
428
# 0: just print errors. useful for cron jobs.
429
#    vs. make: equivalent to --silent, but suppresses external command output
430
# 1: also external commands run. useful for running at the command line.
431
#    vs. make: not provided (but sorely needed to avoid excessive output)
432
# 2: full graphical call tree. useful for determining where error occurred.
433
#    vs. make: equivalent to default verbosity, but with much-needed indents
434
# 3: also values of kw params and variables. useful for low-level debugging.
435
#    vs. make: not provided; need to manually use $(error $(var))
436
# 4: also variables in util.sh commands. useful for debugging util.sh.
437
#    vs. make: somewhat similar to --print-data-base
438
# 5: also variables in logging commands themselves. useful for debugging echo_*.
439
#    vs. make: not provided; need to search Makefile for @ at beginning of cmd
440
# 6+: not currently used (i.e. same as 5)
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442
# definition: the log_level is the minimum verbosity needed to display a message
443
# for messages that use can_log(), the log_level starts with *1*, not 0
444
# for unfiltered messages, the log_level is 0 (i.e. still output at verbosity=0)
445
# to view a message's log_level, count the # of + signs before it in the output
446

    
447
alias log_local='declare PS4="$PS4" log_level="$log_level"'
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449
fi # load new aliases
450
if self_being_included; then
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452
# usage: in func:      log_local; log++; ...
453
#        outside func: log_local; log++; ...; log--
454
#        before cmd:   log++ cmd  OR  log+ num cmd  OR  log++ log++... cmd
455
# with a cmd, assignments are applied just to it, so log_local is not needed
456
# without a cmd, assignments are applied to caller ("$@" expands to nothing)
457
# "${@:2}" expands to all of $@ after *1st* arg, not 2nd ($@ indexes start at 1)
458
log:() # sets explicit log_level
459
{
460
	if test $# -gt 1; then log_local; fi # if cmd, only apply assignments to it
461
	# no local vars because w/o cmd, assignments should be applied to caller
462
	log_level="$1"
463
	PS4="$(str="${PS4:0:1}" n=$((log_level-1)) repeat)${PS4: -2}"
464
	"${@:2}"
465
}
466
log+() { log: $((log_level+$1)) "${@:2}"; }
467
log-() { log+ "-$1" "${@:2}"; }
468
# no log:/+/- alias needed because next word is not an alias-expandable cmd
469
function log++() { log+ 1 "$@"; }
470
function log--() { log- 1 "$@"; }
471
function log!() { log: 0 "$@"; } # force-displays next log message
472
alias log++='"log++" ' # last space alias-expands next word
473
alias log--='"log--" ' # last space alias-expands next word
474
alias log!='"log!" ' # last space alias-expands next word
475

    
476
verbosity_min() # usage: verbosity_min {<min>|''}
477
# WARNING: '' is a special value that causes $verbosity to be overwritten to ''
478
{ if test ! "$1" -o "$(verbosity_int)" -lt "$1"; then verbosity="$1"; fi; }
479
alias verbosity_min='declare verbosity="$verbosity"; "verbosity_min"'
480

    
481
# usage: (verbosity_compat; cmd)
482
function verbosity_compat()
483
{ echo_func; if ((verbosity == 1)); then unset verbosity; fi; }
484
alias verbosity_compat='declare verbosity="$verbosity"; "verbosity_compat"'
485

    
486

    
487
# indent for call tree. this is *not* the log_level (below).
488
: "${log_indent_step=| }" "${log_indent=}"
489
export log_indent_step log_indent # propagate to invoked commands
490

    
491
# see indent alias in stubs
492

    
493

    
494
fi # load new aliases
495
if self_being_included; then
496

    
497
can_log() { test "$log_level" -le "$(verbosity_int)"; }
498
	# verbosity=0 turns off all logging
499

    
500
can_highlight_msg() { test "$log_level" -le 1; }
501

    
502
has_bg()
503
{
504
	# inverse (black background)/set background (normal colors)/set background
505
	# (bright colors) (xfree86.org/current/ctlseqs.html#Character_Attributes)
506
	starts_with 7 "$1" || starts_with 4 "$1" || starts_with 10 "$1"
507
}
508

    
509
highlight_msg() # usage: [format=...] highlight_msg msg
510
# format: the # in xfree86.org/current/ctlseqs.html#Character_Attributes
511
{
512
	kw_params format; local format="${format-1}" # bold
513
	if ! can_highlight_msg; then format=; fi
514
	echo "${format:+[0;${format}m}$1${format:+}"
515
}
516

    
517
log_line!() # highlights log_level 1 messages to stand out against other output
518
{ echo "$log_indent$PS4$(highlight_msg "$1")" >&"$log_fd"; }
519

    
520
log_msg!()
521
{ split_lines "$1"; local l; for l in "${lines[@]}"; do log_line! "$l"; done; }
522

    
523
log() { if can_log; then log_msg! "$@"; fi; }
524

    
525
log_custom() # usage: symbol=... log_custom msg
526
{ log_indent="${log_indent//[^ ]/$symbol}" PS4="${PS4//[^ ]/$symbol}" log "$@";}
527

    
528
bg_r='101;97' # red background with white text
529

    
530
log_err() { symbol='#' format="$bg_r" log_fd="$err_fd" log! log_custom " $1 ";}
531

    
532
log_info() { symbol=: log_custom "$@"; }
533

    
534
mk_hint() { format=7 highlight_msg " $1 "; }
535

    
536
log_hint!() { log_info "$(mk_hint "$@")"; }
537

    
538
log_hint() # usage: cmd || [benign_error=1] log_hint msg [|| handle error]
539
# msg only displayed if not benign error
540
{ kw_params benign_error; if test ! "$benign_error"; then log_hint! "$@"; fi; }
541

    
542
die() # usage: cmd || [type=...] die msg # msg can use $? but not $()
543
{ save_e; kw_params type; "log_${type:-err}" "$1"; rethrow; }
544

    
545
die_e() # usage: cmd || [benign_error=1] die_e [|| handle error]
546
{
547
	save_e; kw_params benign_error
548
	if test "$benign_error"; then log_local; log++; fi
549
	type="${benign_error:+info}" die "command exited with \
550
$(if test "$benign_error"; then echo status; else echo error; fi) $e"
551
	rethrow
552
}
553

    
554
die_error_hidden() # usage: cmd || verbosity_min=# die_error_hidden [|| ...]
555
{
556
	save_e; kw_params verbosity_min; : "${verbosity_min:?}"
557
	echo_vars verbosity
558
	if test "$(verbosity_int)" -lt "$verbosity_min"; then
559
		log_hint 'to see error details, prepend `vb='"$verbosity_min"'` to the command'
560
	fi
561
	rethrow
562
}
563

    
564

    
565
#### functions
566

    
567
func_exists() { declare -f "$1" >/dev/null; }
568

    
569
copy_func() # usage: from=... to=... copy_func
570
# $to must not exist. to get around the no-clobber restriction, use `unset -f`.
571
{
572
	: "${from:?}" "${to:?}"
573
	func_exists "$from" || die "function does not exist: $from"
574
	! func_exists "$to" || die "function already exists: $to"
575
	local from_def="$(declare -f "$from")"
576
	eval "$to${from_def#$from}"
577
}
578

    
579
func_override() # usage: func_override old_name__suffix
580
{ from="${1%__*}" to="$1" copy_func; }
581

    
582
ensure_nested_func() # usage: func__nested_func() { ensure_nested_func; ... }
583
{
584
	local nested_func="${FUNCNAME[1]}"
585
	local func="${nested_func%%__*}"
586
	contains "$func" "${FUNCNAME[@]}" || \
587
		die "$nested_func() must be used by $func()"
588
}
589

    
590

    
591
#### paths
592

    
593
# cache realpath
594
: "${realpath_cache=}" # default off because slower than without
595
if test "$realpath_cache"; then
596
func_override realpath__no_cache
597
realpath() # caches the last result for efficiency
598
{
599
	local cache_key="$*"; load_cache
600
	if ! cached; then save_cache "$(realpath__no_cache "$@")" || return; fi
601
	echo_cached_value
602
}
603
fi
604

    
605
rel_path() # usage: base_dir=... path=... rel_path
606
{
607
	kw_params base_dir path
608
	: "${base_dir:?}" "${path:?}"
609
	
610
	local path="$path/" # add *extra* / to match path when exactly = base_dir
611
	path="${path#$base_dir/}" # remove prefix shared with base_dir
612
	path="${path%/}" # remove any remaining extra trailing /
613
	
614
	if test ! "$path"; then path=.; fi # ensure non-empty
615
	
616
	echo_vars path
617
	echo "$path"
618
}
619

    
620
cd -P . # expand symlinks in $PWD so it matches the output of realpath
621
# do before setting $top_script_abs so realpath has less symlinks to resolve
622

    
623
canon_rel_path() # usage: [base_dir=...] canon_rel_path path
624
{
625
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
626
	base_dir="$(realpath "$base_dir")" || return
627
	local path; path="$(realpath "$1")" || return
628
	rel_path
629
}
630

    
631
canon_dir_rel_path() # usage: [base_dir=...] canon_dir_rel_path path
632
# if the path is a symlink, just its parent dir will be canonicalized
633
{
634
	kw_params base_dir; local base_dir="${base_dir-$PWD}"
635
	base_dir="$(realpath "$base_dir")" || return
636
	local path; path="$(realpath "$(dirname "$1")")/$(basename "$1")" || return
637
	rel_path
638
}
639

    
640
# makes $1 a canon_rel_path if it's a filesystem path
641
alias cmd2rel_path="$(cat <<'EOF'
642
if test "$(type -t "$1")" = file && test -e "$1"; then # not relative to PATH
643
	declare _1="$1"; shift
644
	_1="$(log++ canon_rel_path "$_1")" || return
645
	set -- "$_1" "$@"
646
fi
647
EOF
648
)"
649

    
650
# usage: path_parents path; use ${dirs[@]} # includes the path itself
651
function path_parents()
652
{
653
	echo_func; local path="$1" prev_path=; dirs=()
654
	while test "$path" != "$prev_path"; do
655
		prev_path="$path"
656
		dirs+=("$path")
657
		path="${path%/*}"
658
	done
659
}
660
alias path_parents='declare dirs; "path_parents"'
661

    
662

    
663
#### verbose output
664

    
665

    
666
### command echoing
667

    
668
alias echo_params='log "$*"'
669

    
670
fi # load new aliases
671
if self_being_included; then
672

    
673
echo_cmd() { echo_params; }
674

    
675
function echo_run() { echo_params; "$@"; }
676
# see echo_run alias after stub
677

    
678
echo_builtin() { echo_run builtin "$@"; } # usage: echo_builtin builtin_cmd...
679

    
680
echo_eval() { echo_params; builtin eval "$@"; }
681

    
682
# usage: redirs=(...); [cmd_name_log_inc=#] echo_redirs_cmd
683
function echo_redirs_cmd()
684
{
685
	local cmd_name_log_inc="${cmd_name_log_inc-0}"
686
	
687
	# print <>file redirs before cmd, because they introduce it
688
	log+ "$cmd_name_log_inc" echo_cmd "$@" $(
689
		set -- "${redirs[@]}" # operate on ${redirs[@]}
690
		while test "$#" -gt 0 && starts_with '[<>][^&]' "$1"
691
		do log "$1 \\"; shift; done # log() will run *before* echo_cmd itself
692
		echo "$@"
693
	)
694
}
695
alias echo_redirs_cmd='"echo_redirs_cmd" "$@"'
696

    
697
## vars
698

    
699
echo_vars() # usage: echo_vars var... # only prints vars that are defined
700
{
701
	log_local; log+ 2
702
	if can_log; then
703
		local var
704
		for var in "${@%%=*}"; do
705
			if isset "$var"; then log "$(declare -p "$var")"; fi
706
		done
707
	fi
708
}
709

    
710
echo_export() { builtin export "$@"; echo_vars "$@"; }
711

    
712
alias export="echo_export" # automatically echo env vars when they are set
713

    
714
func_override kw_params__lang
715
kw_params() { kw_params__lang "$@"; echo_vars "$@"; } # echo all keyword params
716

    
717
## functions
718

    
719
# usage: local func=...; set_func_loc; use $file, $line
720
alias set_func_loc="$(cat <<'EOF'
721
: "${func:?}"
722
local func_info="$(shopt -s extdebug; declare -F "$func")" # 'func line file'
723
func_info="${func_info#$func }"
724
local line="${func_info%% *}"
725
local file="${func_info#$line }"
726
EOF
727
)"
728

    
729
fi # load new aliases
730
if self_being_included; then
731

    
732
func_loc() # gets where function declared in the format file:line
733
{
734
	local func="$1"; set_func_loc
735
	file="$(canon_rel_path "$file")" || return
736
	echo "$file:$line"
737
}
738

    
739
# usage: func() { [minor=1] echo_func; ... }
740
function echo_func()
741
# usage: "echo_func" "$FUNCNAME" "$@" && indent || true
742
# exit status: whether function call was echoed
743
{
744
	log_local; log++; can_log || return
745
	local func="$1"; shift
746
	local loc; loc="$(log++ func_loc "$func")" || return
747
	echo_cmd "$loc" "$func" "$@"
748
}
749
# see echo_func alias after stub
750

    
751
fi # load new aliases
752
if self_being_included; then
753

    
754

    
755
#### streams
756

    
757
fd_exists() { (: <&"$1") 2>/dev/null; }
758

    
759
require_fd_not_exists() # usage: require_fd_not_exists fd || return 0
760
{ ! fd_exists "$1" || type=info die "fd $1 already exists, skipping"; }
761

    
762
set_fds() # usage: set_fds redirect...
763
# WARNING: does not currently support redirecting an fd to itself (due to bash
764
# bug that requires the dest fd to be closed before it can be reopened)
765
{
766
	echo_func
767
	
768
	# add #<>&- before every #<>&# reopen to fix strange bash bug
769
	local redirs=() i
770
	for i in "$@"; do
771
		# remove empty redirects resulting from using `redirs= cmd...` to clear
772
		# the redirs and then using $redirs as an array
773
		if test "$i"; then
774
			local redir_prefix="$(match_prefix '*[<>]' "$i")"
775
			local dest="$(        rm_prefix    '*[<>]' "$i")"
776
			if test "$dest" && ! starts_with '&' "$dest"; then # escape dest
777
				i="$redir_prefix$(printf %q "$dest")"
778
			fi
779
			if test "$redir_prefix"; then redirs+=("$redir_prefix&-"); fi
780
			redirs+=("$i")
781
		fi
782
	done
783
	set -- "${redirs[@]}"
784
	
785
	if (($# > 0)); then echo_eval exec "$@"; fi
786
}
787

    
788
fd_set_default() # usage: fd_set_default 'dest[<>]src'
789
{
790
	echo_func
791
	local dest="${1%%[<>]*}"
792
	require_fd_not_exists "$dest" || return 0
793
	set_fds "$1"
794
}
795

    
796
stdout2fd() # usage: fd=# stdout2fd cmd...
797
{
798
	echo_func; kw_params fd; : "${fd?}"
799
	if test "$fd" != 1; then local redirs=(">&$fd" "${redirs[@]}"); fi
800
	redir "$@"
801
}
802

    
803
function filter_fd() # usage: (fd=# [redirs=] filter_fd filter_cmd...; \
804
# with filter...) # be sure ${redirs[@]} is not set to an outer value
805
# useful e.g. to filter logging output or highlight errors
806
{
807
	echo_func; kw_params fd; : "${fd?}"
808
	set_fds "$fd>" >(pipe_delay; stdout2fd "$@")
809
	pipe_delay; pipe_delay # wait for >()'s pipe_delay and initial logging
810
}
811
alias filter_fd='"filter_fd" ' # last space alias-expands next word
812

    
813
stderr2stdout() # usage: { stderr2stdout cmd...|use stderr...; } 41>&1
814
# **IMPORTANT**: fd 41 must later be redirected back to fd 1
815
# unlike `2>&1`, logs stderr
816
# redirects the command stdout to fd 41 to avoid collision with stderr
817
{
818
	echo_func
819
	# command causes log_fd to be re-filtered, so that stderr is also filtered.
820
	# fd 2 is *not* redirected back to fd 2, to allow log-filtering out an
821
	# otherwise-confusing benign error.
822
	"$@" 2> >(command tee /dev/fd/"$log_fd") >&41 # redirects 2->{1,log_fd}
823
}
824

    
825
stdout_contains()
826
# usage: { stderr2stdout cmd|stdout_contains echo_run grep ...; } 41>&1
827
{ echo_func; pipe_delay; pipe_delay; pipe_delay; "$@"|echo_stdout >/dev/null; }
828

    
829
stderr_matches() # usage: pattern=... [ignore_e=#] stderr_matches cmd...
830
{
831
	echo_func; kw_params pattern ignore_e; : "${pattern?}"
832
	if test "$ignore_e"; then local benign_error=1; fi
833
	
834
	# not necessary to allow callers to handle the error themselves (which would
835
	# require *every* caller to wrap this function in prep_try/rethrow), because
836
	# they would just handle it by errexiting anyways
837
	prep_try
838
	
839
	set +o errexit # avoid errexiting since @PIPESTATUS will be used instead
840
	{ stderr2stdout "$@"|stdout_contains echo_run grep -E "$pattern"; } 41>&1
841
	local PIPESTATUS_=("${PIPESTATUS[@]}") # save b/c it's reset after each cmd
842
	set -o errexit
843
	
844
	# handle any error
845
	e="${PIPESTATUS_[0]}" # 1st command's exit status -> $e
846
	ignore_e "$ignore_e" # also works w/ ignore_e=''
847
	rethrow_exit
848
	
849
	return "${PIPESTATUS_[1]}" # 2nd command's exit status -> $?
850
}
851

    
852
fi # load new aliases
853
if self_being_included; then
854

    
855
function ignore_err_msg() # usage: pattern=... ignore_err_msg cmd...
856
# unlike `|| true`, this suppresses only errors caused by a particular error
857
# *message*, rather than all error exit statuses
858
{
859
	echo_func; kw_params pattern; : "${pattern?}"
860
	stderr_matches "$@" || true # also ignore false exit status on no match
861
}
862
alias ignore_err_msg='"ignore_err_msg" ' # last space alias-expands next word
863

    
864
# convention: use fd 40/41/42 for command-specific alternate stdin/stdout/stderr
865
# mnemonic: 4 looks like A for Alternate
866
# do NOT use 1x, which are used by eval (which is used by set_fds())
867
# do NOT use 2x, which we use as global stdin/stdout/stderr
868
# do NOT use 3x, which we use for logging
869

    
870
setup_log_fd() # view logging output at verbosity >= 5
871
{
872
	log_local; log+ 4; log-- echo_func 
873
	fd_set_default '30>&2' || true # stdlog
874
	log_fd=30 # stdlog
875
}
876
setup_log_fd
877

    
878
set_global_fds()
879
# allows commands to access global stdin/stdout/stderr using fd 20/21/22
880
# this works even when /dev/tty isn't available
881
# view logging output at verbosity >= 3
882
{
883
	log_local; log+ 2; log-- echo_func
884
	# ignore errors if a source fd isn't open
885
	fd_set_default '20<&0' || true
886
	fd_set_default '21>&1' || true
887
	fd_set_default '22>&2' || true
888
}
889
set_global_fds
890

    
891
# usage: explicit_errors_only=1 script...
892
# show only explicitly-displayed errors (which have been redirected to fd 22)
893
# most of the time this has the same effect as `verbosity=0 script...`,
894
# which displays everything that isn't explicitly hidden
895
# this option should only be used for testing the explicit error displaying
896
if test "$explicit_errors_only"; then disable_logging; fi
897

    
898

    
899
echo_vars is_outermost
900

    
901

    
902
#### paths
903

    
904
top_script="${BASH_SOURCE[${#BASH_SOURCE[@]}-1]}"
905
	# outermost script; unlike $0, also defined for .-scripts
906

    
907
top_symlink_dir="$(dirname "$top_script")"; echo_vars top_symlink_dir
908
top_symlink_dir_abs="$(realpath "$top_symlink_dir")"
909
	echo_vars top_symlink_dir_abs
910

    
911
top_script_abs="$(realpath "$top_script")"; echo_vars top_script_abs
912
	# realpath this before doing any cd so this points to the right place
913
top_dir_abs="$(dirname "$top_script_abs")"; echo_vars top_dir_abs
914

    
915
set_paths()
916
{
917
	top_script="$(log++ canon_rel_path "$top_script_abs")" || return
918
		echo_vars top_script
919
	top_dir="$(dirname "$top_script")" || return; echo_vars top_dir
920
}
921
set_paths
922

    
923
# usage: $(enter_top_dir; cmd...)
924
function enter_top_dir() { echo_func; cd "$top_dir"; }
925
alias enter_top_dir='log++; "enter_top_dir"'
926

    
927
# usage: in_top_dir cmd...
928
function in_top_dir() { echo_func; (enter_top_dir; "$@"); }
929
alias in_top_dir='"in_top_dir" ' # last space alias-expands next word
930

    
931
PATH_rm() # usage: PATH_rm path... # removes components from the PATH
932
{
933
	echo_func; echo_vars PATH; : "${PATH?}"
934
	log_local
935
	log+ 2
936
	split : "$PATH"
937
	local new_paths=()
938
	for path in "${parts[@]}"; do
939
		if ! contains "$path" "$@"; then new_paths+=("$path"); fi
940
	done
941
	PATH="$(delim=: join "${new_paths[@]}")" || return
942
	log- 2
943
	echo_vars PATH
944
}
945

    
946
no_PATH_recursion() # usage: (no_PATH_recursion; cmd...)
947
# allows running a system command of the same name as the script
948
{
949
	echo_func
950
	PATH_rm "$top_dir_abs" "$top_symlink_dir" "$top_symlink_dir_abs" "$top_dir"
951
}
952

    
953
# makes command in $1 nonrecursive
954
# allows running a system command of the same name as the script
955
alias cmd2abs_path="$(cat <<'EOF'
956
declare _1="$1"; shift
957
_1="$(indent; no_PATH_recursion; log++; which "$_1"|echo_stdout)" || return
958
set -- "$_1" "$@"
959
EOF
960
)"
961

    
962

    
963
#### verbose output
964

    
965

    
966
## internal commands
967

    
968
.()
969
{
970
	log++ log++ echo_func
971
	cmd2rel_path; set -- "$FUNCNAME" "$@"
972
	if (log++; echo_params; can_log); then indent; fi
973
	builtin "$@"
974
}
975

    
976
.rel() # usage: .rel file [args...] # file relative to ${BASH_SOURCE[0]} dir
977
{
978
	log++ log++ echo_func; local file="$1"; shift
979
	. "$(canon_rel_path "$(dirname "$(realpath "${BASH_SOURCE[1]}")")/$file")" \
980
"$@"
981
}
982

    
983
cd() # indent is permanent within subshell cd was used in
984
{
985
	log_local; log++ echo_func
986
	cmd2rel_path; echo_cmd "$FUNCNAME" "$@"
987
	if can_log; then caller_indent; fi
988
	# -P: expand symlinks so $PWD matches the output of realpath
989
	builtin "$FUNCNAME" -P "$@"
990
	
991
	func=realpath clear_cache
992
	set_paths
993
}
994

    
995
## external commands
996

    
997
disable_logging() { set_fds "$log_fd>/dev/null"; }
998

    
999
function redir() # usage: local redirs=(#<>...); redir cmd...; unset redirs
1000
# to view only explicitly-displayed errors: explicit_errors_only=1 script...
1001
{
1002
	echo_func; kw_params redirs
1003
	
1004
	case "$1" in redir|command) "$@"; return;; esac # redir will be run later
1005
	(
1006
		log++ set_fds "${redirs[@]}"
1007
		unset redirs # don't redirect again in invoked command
1008
		(case "$1" in command__exec) shift;; esac; echo_redirs_cmd)
1009
		"$@"
1010
	) || return
1011
}
1012
alias redir='"redir" ' # last space alias-expands next word
1013

    
1014
alias_append save_e '; unset redirs' # don't redirect error handlers
1015

    
1016
fi # load new aliases
1017
if self_being_included; then
1018

    
1019
command() # usage: [cmd_log_fd=|1|2|#] [verbosity_min=] [nonrecursive=1] \
1020
# command extern_cmd...
1021
{
1022
	echo_func; kw_params log_fd cmd_log_fd redirs verbosity_min
1023
	# if no cmd_log_fd, limit log_fd in case command uses util.sh
1024
	local cmd_log_fd="${cmd_log_fd-$log_fd}"
1025
	local redirs=("${redirs[@]}")
1026
	
1027
	# determine redirections
1028
	if test "$cmd_log_fd"; then
1029
		if can_log; then
1030
			if test "$cmd_log_fd" != "$log_fd"; then
1031
				redirs+=("$cmd_log_fd>&$log_fd")
1032
			fi # else no redir needed
1033
		else redirs+=("$cmd_log_fd>/dev/null");
1034
		fi
1035
	fi
1036
	
1037
	if test "$nonrecursive"; then cmd2abs_path; else cmd2rel_path; fi
1038
	redir command__exec "$@" || die_e
1039
}
1040
command__exec()
1041
{
1042
	ensure_nested_func
1043
	if can_log; then indent; fi
1044
	if test "$verbosity_min"; then verbosity_min "$verbosity_min"; fi
1045
	verbosity_compat
1046
	builtin command "$@"
1047
}
1048

    
1049

    
1050
### external command input/output
1051

    
1052
echo_stdin() # usage: input|echo_stdin|cmd
1053
{
1054
	if can_log; then
1055
		pipe_delay
1056
		echo ----- >&"$log_fd"
1057
		tee -a /dev/fd/"$log_fd";
1058
		echo ----- >&"$log_fd"
1059
	else cat
1060
	fi
1061
}
1062

    
1063
echo_stdout() { echo_stdin; } # usage: cmd|echo_stdout
1064

    
1065

    
1066
#### commands
1067

    
1068
already_exists_msg() # usage: cond || what=... already_exists_msg || return 0
1069
{
1070
	type=info die "$what"' already exists, skipping
1071
 to force-remake, prepend `rm=1` to the command '
1072
}
1073

    
1074
require_not_exists() # usage: require_not_exists file || return 0
1075
{ test ! -e "$1" || what="file \"$1\"" already_exists_msg; }
1076

    
1077
function to_file() # usage: stdout=... [if_not_exists=1] [del=] to_file cmd...
1078
# auto-removes a command's output file on error (like make's .DELETE_ON_ERROR)
1079
{
1080
	echo_func; kw_params stdout if_not_exists del
1081
	: "${stdout?}"; local del="${del-1}"
1082
	if test "$if_not_exists"; then require_not_exists "$stdout" || return 0; fi
1083
	
1084
	local redirs=("${redirs[@]}" ">$stdout")
1085
	redir "$@" || { save_e; test ! "$del" || rm "$stdout"; rethrow; }
1086
}
1087
alias to_file='"to_file" ' # last space alias-expands next word
1088

    
1089
log_bg() { symbol='&' log_custom "$@"; }
1090

    
1091
log_last_bg() { log_bg '$!='"$!"; }
1092

    
1093
function bg_cmd() # usage: bg_cmd cmd...
1094
{ echo_func; log_bg "$@"; "$@" & log_last_bg; }
1095
alias bg_cmd='"bg_cmd" ' # last space alias-expands next word
1096

    
1097

    
1098
#### filesystem
1099

    
1100
alias mkdir='mkdir -p'
1101

    
1102
alias file_size=\
1103
"stat `case "$(uname)" in Darwin) echo -f %z;; *) echo --format=%s;; esac`"
1104

    
1105
alias wildcard='shopt -s nullglob; echo' # usage: "$(wildcard glob...)"
1106
alias wildcard1='shopt -s nullglob; echo1' # usage: "$(wildcard1 glob...)"
1107

    
1108
fi # load new aliases
1109
if self_being_included; then
1110

    
1111
mv2dir() { echo_func; mkdir "${!#}"; mv "$@"; } # usage: mv2dir ... dir
1112

    
1113
# usage: (mv_glob ... dir)
1114
function mv_glob() { echo_func; if (($# > 1)); then mv2dir "$@"; fi; }
1115
alias mv_glob='shopt -s nullglob; "mv_glob"'
1116

    
1117

    
1118
#### URLs
1119

    
1120
localize_url() { test _"$1" = _"$(hostname -f)" || echo "$1"; }
1121

    
1122
fi
(10-10/11)