command_duration.bash

# shellcheck shell=bash
#
# Functions for measuring and reporting how long a command takes to run.

# Get shell duration in decimal format regardless of runtime locale.
function _command_duration_pre_exec() {
	if [[ -n "${EPOCHREALTIME:-}" ]]; then
		COMMAND_DURATION_START_SECONDS="${EPOCHREALTIME//,/.}"
	else
		COMMAND_DURATION_START_SECONDS="$SECONDS"
	fi
}

: "${COMMAND_DURATION_ICON:=🕘}"
: "${COMMAND_DURATION_MIN_SECONDS:=1}"

function _command_duration_pre_cmd() {
	COMMAND_DURATION_START_SECONDS=""
}

function _dynamic_clock_icon {
	local clock_hand
	# clock hand value is between 90 and 9b in hexadecimal.
	# so between 144 and 155 in base 10.
	printf -v clock_hand '%x' $((((${1:-${SECONDS}} - 1) % 12) + 144))
	printf -v 'COMMAND_DURATION_ICON' '%b' "\xf0\x9f\x95\x$clock_hand"
}

function _command_duration() {
	[[ -n "${BASH_IT_COMMAND_DURATION:-}" ]] || return
	[[ -n "${COMMAND_DURATION_START_SECONDS:-}" ]] || return

	local current_time
	if [[ -n "${EPOCHREALTIME:-}" ]]; then
		current_time="${EPOCHREALTIME//,/.}"
	else
		current_time="$SECONDS"
	fi

	local -i command_duration=0
	local -i minutes=0 seconds=0 deciseconds=0

	local -i start_s=${COMMAND_DURATION_START_SECONDS%.*}
	local -i curr_s=${current_time%.*}

	# Calculate seconds difference
	command_duration=$((curr_s - start_s))

	# Calculate deciseconds if both timestamps have fractional parts
	if [[ "$COMMAND_DURATION_START_SECONDS" == *.* ]] && [[ "$current_time" == *.* ]]; then
		local start_fs="${COMMAND_DURATION_START_SECONDS#*.}"
		local curr_fs="${current_time#*.}"

		# Take first digit for deciseconds
		local -i start_ds="${start_fs:0:1}"
		local -i curr_ds="${curr_fs:0:1}"

		if ((curr_ds >= start_ds)); then
			deciseconds=$((curr_ds - start_ds))
		else
			((command_duration -= 1))
			deciseconds=$((10 + curr_ds - start_ds))
		fi
	fi

	if ((command_duration < 0)); then
		command_duration=0
		deciseconds=0
	fi

	if ((command_duration >= COMMAND_DURATION_MIN_SECONDS)); then
		minutes=$((command_duration / 60))
		seconds=$((command_duration % 60))

		_dynamic_clock_icon "${command_duration}"
		if ((minutes > 0)); then
			printf "%s %s%dm %ds" "${COMMAND_DURATION_ICON:-}" "${COMMAND_DURATION_COLOR:-}" "$minutes" "$seconds"
		else
			printf "%s %s%d.%01ds" "${COMMAND_DURATION_ICON:-}" "${COMMAND_DURATION_COLOR:-}" "$seconds" "$deciseconds"
		fi
	fi
}

_bash_it_library_finalize_hook+=("safe_append_preexec '_command_duration_pre_exec'")
_bash_it_library_finalize_hook+=("safe_append_prompt_command '_command_duration_pre_cmd'")