ipcam: rewrite motion detection system

1 files changed, 122 insertions, 0 deletions

diff --git a/tools/lib.bash b/tools/lib.bash
new file mode 100644
index 0000000..1cf459b
--- /dev/null
+++ b/tools/lib.bash
@@ -0,0 +1,122 @@
+# colored output
+# --------------
+
+BOLD=$(tput bold)
+RST=$(tput sgr0)
+RED=$(tput setaf 1)
+GREEN=$(tput setaf 2)
+YELLOW=$(tput setaf 3)
+CYAN=$(tput setaf 6)
+VERBOSE=
+
+echoinfo() {
+	>&2 echo "${CYAN}$@${RST}"
+}
+
+echoerr() {
+	>&2 echo "${RED}${BOLD}error:${RST}${RED} $@${RST}"
+}
+
+echowarn() {
+	>&2 echo "${YELLOW}${BOLD}warning:${RST}${YELLOW} $@${RST}"
+}
+
+die() {
+    echoerr "$@"
+    exit 1
+}
+
+debug() {
+	if [ -n "$VERBOSE" ]; then
+		>&2 echo "$@"
+	fi
+}
+
+
+# measuring executing time
+# ------------------------
+
+__time_started=
+
+time_start() {
+	__time_started=$(date +%s)
+}
+
+time_elapsed() {
+	local fin=$(date +%s)
+	echo $(( fin - __time_started ))
+}
+
+
+# config parsing
+# --------------
+
+read_config() {
+	local config_file="$1"
+	local dst="$2"
+
+	[ -f "$config_file" ] || die "read_config: $config_file: no such file"
+
+	local n=0
+	local failed=
+	local key
+	local value
+
+	while read line; do
+		n=$(( n+1 ))
+
+		# skip empty lines or comments
+		if [ -z "$line" ] || [[ "$line" =~ ^#.*  ]]; then
+			continue
+		fi
+
+		if [[ $line = *"="* ]]; then
+			key="${line%%=*}"
+			value="${line#*=}"
+			eval "$dst[$key]=\"$value\""
+		else
+			echoerr "config: invalid line $n"
+			failed=1
+		fi
+	done < <(cat "$config_file")
+
+	[ -z "$failed" ]
+}
+
+check_config() {
+	local var="$1"
+	local keys="$2"
+
+	local failed=
+
+	for key in $keys; do
+		if [ -z "$(eval "echo -n \${$var[$key]}")" ]; then
+			echoerr "config: ${BOLD}${key}${RST}${RED} is missing"
+			failed=1
+		fi
+	done
+
+	[ -z "$failed" ]
+}
+
+
+# other functions
+# ---------------
+
+installed() {
+	command -v "$1" > /dev/null
+	return $?
+}
+
+download() {
+	local source="$1"
+	local target="$2"
+
+	if installed curl; then
+		curl -f -s -o "$target" "$source"
+	elif installed wget; then
+		wget -q -O "$target" "$source"
+	else
+		die "neither curl nor wget found, can't proceed"
+	fi
+}