apps/system/grep: Add standalone grep with regexp support

system/grep/CMakeLists.txt

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+# ##############################################################################
+# apps/system/grep/CMakeLists.txt
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more contributor
+# license agreements.  See the NOTICE file distributed with this work for
+# additional information regarding copyright ownership.  The ASF licenses this
+# file to you under the Apache License, Version 2.0 (the "License"); you may not
+# use this file except in compliance with the License.  You may obtain a copy of
+# the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations under
+# the License.
+#
+# ##############################################################################
+
+if(CONFIG_SYSTEM_GREP)
+  nuttx_add_application(
+    MODULE
+    ${CONFIG_SYSTEM_GREP}
+    NAME
+    ${CONFIG_SYSTEM_GREP_PROGNAME}
+    STACKSIZE
+    ${CONFIG_SYSTEM_GREP_STACKSIZE}
+    PRIORITY
+    ${CONFIG_SYSTEM_GREP_PRIORITY}
+    SRCS
+    grep_main.c)
+
+endif()

system/grep/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config SYSTEM_GREP
+	tristate "system 'grep' command"
+	default n
+	depends on LIBC_REGEX
+	---help---
+		Enable support for the system 'grep' command (regex-based search).
+
+if SYSTEM_GREP
+
+config SYSTEM_GREP_PROGNAME
+	string "grep program name"
+	default "grep"
+	---help---
+		This is the name of the program that will be used when the grep
+		program is installed.
+
+config SYSTEM_GREP_PRIORITY
+	int "grep task priority"
+	default 100
+
+config SYSTEM_GREP_STACKSIZE
+	int "grep stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

system/grep/Make.defs

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+############################################################################
+# apps/system/grep/Make.defs
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+ifneq ($(CONFIG_SYSTEM_GREP),)
+CONFIGURED_APPS += $(APPDIR)/system/grep
+endif

system/grep/Makefile

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+############################################################################
+# apps/system/grep/Makefile
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.  The
+# ASF licenses this file to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance with the
+# License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# Standalone grep command
+
+PROGNAME  = $(CONFIG_SYSTEM_GREP_PROGNAME)
+PRIORITY  = $(CONFIG_SYSTEM_GREP_PRIORITY)
+STACKSIZE = $(CONFIG_SYSTEM_GREP_STACKSIZE)
+MODULE    = $(CONFIG_SYSTEM_GREP)
+
+# Files
+
+MAINSRC = grep_main.c
+
+include $(APPDIR)/Application.mk