lib/sh/util.sh: set_global_fds(): debug to global stderr in case stderr filtered

lib/sh/util.sh: debugging: use configurable debug_fd (set to $err_fd)

lib/sh/util.sh: signals: override catch() to support SIG* as exception type

lib/sh/util.sh: moved primitives sections before more complex sections that depend on them

lib/sh/util.sh: 2nd functions section: moved to 1st functions section

bugfix: lib/sh/util.sh: added workaround for bash bug where exit sometimes inxeplicably ignores $?

fix: lib/sh/util.sh: self_builtin: avoid $() so that $? isn't modified

lib/sh/util.sh: use new self_builtin

lib/sh/util.sh: added self_builtin

lib/sh/util.sh: pv(), pf(): moved to debugging section

bugfix: lib/sh/util.sh: stderr_matches(): also need to handle any filter error, such as caused by Ctrl+C

lib/sh/util.sh: stderr_matches(): echo_vars @PIPESTATUS_ to assist debugging

bugfix: lib/sh/util.sh: stderr2stdout(): use piped_cmd to ignore SIGPIPE since the output of this will piped to another command

lib/sh/util.sh: setup_log_fd(): $log_fd: use 3 (stdlog) since other scripts are likely to use this for logging as well

fix: lib/sh/util.sh: setup_log_fd(): fd_set_default(): use $log_fd instead of repeating the value of it

lib/sh/util.sh: die(): log at higher log_level, since this is logging code

lib/sh/util.sh: highlight_log_msg(): log at higher log_level, since this is logging code

bugfix: lib/sh/util.sh: stderr_matches(): only set benign_error=1 if the matched error occurred

lib/sh/util.sh: ignore_e(): also set benign_error=1

fix: lib/sh/util.sh: prep_try alias: removed inaccurate comment

bugfix: lib/sh/util.sh: stdout2fd(): moved after redir() which it depends on

fix: lib/sh/util.sh: command(): moved `|| die_e` to command__exec so it would be properly indented under the echoed command

lib/sh/util.sh: verbosity_compat(): log at higher log_level because it's logging code

lib/sh/util.sh: $benign_error: log at higher log_level because it's logging code

lib/sh/util.sh: $top_* vars, $is_outermost: log at higher log_level because it's startup code

lib/sh/util.sh: $top_script: echo_vars this like the other $top_* vars

lib/sh/util.sh: .(): log at higher log_level because it's startup code

lib/sh/util.sh: is_dot_script(): run with higher log_level since this is run at the beginning of the script

lib/sh/util.sh, runscripts/util.run: set_paths(): run with higher log_level to hide all the paths that are set at the beginning of the script

lib/sh/util.sh: added log++ stub

lib/sh/util.sh: added log_local stub

lib/sh/util.sh: added log() stub so internal commands can use it

fix: lib/sh/util.sh: echo_vars(): log at same log_level as echo_func so kw_params are displayed along with positional params

fix: lib/sh/util.sh: rel_path(): log this internal command at a higher log_level so it's normally hidden

fix: lib/sh/util.sh: log_msg!(): log split_lines at a higher log_level so it's normally hidden

bugfix: lib/sh/util.sh: stderr_matches(): `log_local; log++` should apply to just stdout_contains() and part of stderr2stdout() rather than all of stderr_matches()

lib/sh/util.sh: stderr_matches(): run at higher log_level because error-handling internals should not be logged by default

bugfix: lib/sh/util.sh: stderr_matches(): handle any error: only ignore_e if the error exit status was associated with the matched error message

bugfix: lib/sh/util.sh: stderr_matches(): handle any error: need force-exit with rethrow_exit() because caller's test of return status disables errexit

lib/sh/util.sh: added rethrow_exit(), which exits even where errexit is disabled

lib/sh/util.sh: sudo alias: use function instead so this can be overridden

lib/sh/util.sh: added is_intern()

lib/sh/util.sh: is_callable(): use just $1 because multiple args are not applicable

lib/sh/util.sh: added is_world_executable()

lib/sh/util.sh: added has_perms()

lib/sh/util.sh: esc_args(): renamed to just esc() because this can also be used on a single value

lib/sh/util.sh: added is_extern()

lib/sh/util.sh: added sudo alias to alias-expand command

lib/sh/util.sh: added $sudo

lib/sh/util.sh: added cp alias

bugfix: lib/sh/util.sh: local_array/export_array: do need -a because that it's an array is apparently not autodetected by the () on Mac

lib/sh/util.sh: import_vars: documented that vars already set will not be overwritten

lib/sh/util.sh: removed end_try_subshell, which now does the same thing as end_try

bugfix: lib/sh/util.sh: die(): usage: documented that if msg uses $(...), save_e is needed

bugfix: lib/sh/util.sh: already_exists_msg(): need to save_e, because new $(mk_hint) call resets $?

lib/sh/util.sh: die(): always errexit even if $e = 0, because die always indicates an error

lib/sh/util.sh: added rethrow!(), which always errexits, even if $e = 0

lib/sh/util.sh: rethrow(): also work in situations where $e is not set

lib/sh/util.sh: rethrow: made it a function since there is now no need for it to be an alias

lib/sh/util.sh: rethrow: removed `test "$e" != 0` since errexit only does anything if $e != 0

lib/sh/util.sh: removed separate rethrow_exit*, rethrow_subshell*, since they now do the same thing as rethrow*

lib/sh/util.sh: rethrow*!: use new errexit, which works in functions and subshells

lib/sh/util.sh: added errexit(), used in place of (exit "$1") because a bug in bash prevents subshells from triggering errexit

lib/sh/util.sh: added bool!()

fix: lib/sh/util.sh: redir(): need to indent before invoking an external command (not just in command__exec(), but for all redir() calls)

lib/sh/util.sh: filesystem: added is_*(), could_be_*()

lib/sh/util.sh: added contains_match()

lib/sh/util.sh: added ends_with()

bugfix: lib/sh/util.sh: DON'T do `shopt -s lastpipe` because this causes a segfault on Linux in stderr_matches(). (it also isn't supported on Mac.) use @PIPESTATUS instead. note that we do not currently need lastpipe, since we use @PIPESTATUS (which actually provides more functionality for our purposes).

fix: lib/sh/util.sh: echo_func(): file/line #: display with regular color because the lighter color actually draws attention to rather than away from the faded text

lib/sh/util.sh: added plain()

fix: lib/sh/util.sh: fade(): use medium gray instead of light gray because it fades on white and black backgrounds

lib/sh/util.sh: echo_func(): fade the file/line # to avoid distracting from the function call in the default log output

lib/sh/util.sh: added fade()

lib/sh/util.sh: highlight_msg(): renamed to highlight_log_msg() to clarify that this contains log++-specific functionality

lib/sh/util.sh: moved terminal formatting commands to own section

lib/sh/util.sh: highlight_msg(): moved formatting code into separate format() function

lib/sh/util.sh: dp(): renamed to ps() to corresponding with pv/pf

lib/sh/util.sh: echo_func(): put file/line # after function call instead of before so the function name is listed first

lib/sh/util.sh: echo_func(): usage: removed no longer used/implemented minor=1 switch. use log++ instead.

lib/sh/util.sh: ignore_err_msg(): usage: added $ignore_e param from stderr_matches()

lib/sh/util.sh: log_hint(): renamed to log_err_hint() for clarity, because this applies only to hints for errors

bugfix: lib/sh/util.sh: log_hint!(): use log_err instead of log_info because hints as used here are attached to (possibly benign) errors. for other uses, use mk_hint().

fix: lib/sh/util.sh: highlight_msg(): don't ' '-pad already-formatted text

lib/sh/util.sh: manual terminal escape sequences: use highlight_msg() instead

lib/sh/util.sh: highlight_msg(): auto-add padding around text if there is a background

lib/sh/util.sh: highlight_msg(): use $format itself as the $highlight boolean

lib/sh/util.sh: highlight_msg(): split apart the testing of $format and can_highlight_msg

lib/sh/util.sh: added has_bg()

bugfix: lib/sh/util.sh: highlight_msg(): need to reset any existing formatting before applying new formatting

lib/sh/util.sh: added mk_hint() and use it in log_hint!()

lib/sh/util.sh: bg_cmd(): also log the command being run

fix: lib/sh/util.sh: need `function` before functions that have an alias with the same name

lib/sh/util.sh: log!(): use new log:()

lib/sh/util.sh: added log:(), which sets an explicit log_level. this also simplifies log+().

lib/sh/util.sh: log+(): set log_level before PS4 so that the PS4 expr doesn't also need to add to log_level

lib/sh/util.sh: removed no longer needed log+ alias (which had been renamed from clog+)

lib/sh/util.sh: clog*: renamed to log* for clarity (possible now that log* is no longer used for function-local log_level setting)

: local setting of log_level: use log_local instead of relying on the log aliases, so that these aliases can instead be used for wrapping commands (the more common use case)

bugfix: lib/sh/util.sh: verbosity_compat alias: need to use `declare verbosity="$verbosity"` instead of `declare verbosity`, which would just clear $verbosity