add example of fs (#3)

* add example of fs

* adjust the fs example directory structure

---------

Co-authored-by: forrest.liu <forrest.liu@quectel.com>

Author: DavidLiu123

system/fs/example_fs_advanced_operation.py

@@ -0,0 +1,62 @@
+import ql_fs
+
+def main():
+    # 递归式创建文件夹, 传入文件夹路径
+    ql_fs.mkdirs("usr/a/b")
+
+    # 查看文件或文件夹是否存在
+    ret = ql_fs.path_exists("/usr/a/b")
+    if ret:
+        print("make dir success")
+    else:
+        print("make dir fail")
+        return
+
+    # 创建文件或者更新文件数据
+    data = {"test":1}
+    ql_fs.touch("/usr/a/b/config.json", data)
+	
+    # 查看文件或文件夹是否存在
+    ret = ql_fs.path_exists("/usr/a/b/config.json")
+    if ret:
+        print("create file success")
+    else:
+        print("create file fail")
+        return
+	
+	# 读取json文件
+    data = ql_fs.read_json("/usr/a/b/config.json")
+    print("config json read content:{}".format(data))
+    data = ql_fs.read_json("/usr/system_config.json")
+    len = ql_fs.path_getsize('usr/system_config.json')
+    print("system_config json length:{}".format(len))
+    print("system_config json read content:{}".format(data))
+	
+	# 文件拷贝
+    ql_fs.file_copy("/usr/a/b/config.json", "usr/system_config.json")
+    data = ql_fs.read_json("/usr/a/b/config.json")
+    print("copy json read content:{}".format(data))
+	
+	# 获取文件所在文件夹路径
+    ret = ql_fs.path_dirname("/usr/a/b/config.json")
+    print("path of the file:{}".format(ret))
+	
+	# 删除文件夹和其下的文件
+    ql_fs.rmdirs("usr/a")
+
+    # 查看文件或文件夹是否存在
+    ret = ql_fs.path_exists("/usr/a/b/config.json")
+    if ret:
+        print("remove file fail, test fail")
+
+    ret = ql_fs.path_exists("/usr/a/b")
+    if ret:
+        print("remove dir2 fail, test fail")
+		
+    ret = ql_fs.path_exists("/usr/a")
+    if ret:
+        print("remove dir1 fail, test fail")
+
+
+if __name__ == "__main__":
+    main()

system/fs/example_fs_basic_operation_posix.py

@@ -0,0 +1,16 @@
+# 创建一个test.txt文件,注意路径在/usr下
+f = open("/usr/test.txt", "w+")
+i = f.write("hello world\n")
+i = i + f.write("hello quecpython\n")
+print("write length{}".format(i))
+f.seek(0)
+str = f.read(10)
+print("read content:{}".format(str))
+f.seek(0)
+str = f.readline()
+print("read line content:{}".format(str))
+f.seek(0)
+str = f.readlines()
+print("read all lines content:{}".format(str))
+f.close()
+print("test end")

system/fs/example_fs_basic_operation_uos.py

@@ -0,0 +1,66 @@
+import uos
+
+def main():
+    # 创建文件 此处并没有对文件进行写入操作
+    f = open("/usr/uos_test","w")
+    f.close()
+    del f
+
+    # 查看文件是否存在
+    t = uos.listdir("/usr")
+    print("usr files:{}".format(t))
+
+    if "uos_test" not in t:
+        print("file not exist test fail")
+        return
+
+    # 查看文件状态
+    a = uos.stat("/usr/uos_test")
+    print("file size:{}bytes".format(a[6]))
+
+    # 重命名文件
+    uos.rename("/usr/uos_test", "/usr/uos_test_new")
+    t = uos.listdir("/usr")
+    print("test file renamed, usr files:{}".format(t))
+
+    if "uos_test_new" not in t:
+        print("renamed file not exist test fail")
+        return
+
+    # 删除文件
+    uos.remove("/usr/uos_test_new")
+    t = uos.listdir("/usr")
+    print("remove test file, usr files:{}".format(t))
+
+    if "uos_test_new" in t:
+        print("remove file fail, test fail")
+        return
+
+    # 目录操作
+    t = uos.getcwd()
+    print("current path:{}".format(t))
+    uos.chdir("/usr")
+    t = uos.getcwd()
+    print("current path:{}".format(t))
+    if "/usr" != t:
+        print("dir change fail")
+        return
+
+    uos.mkdir("testdir")
+    t = uos.listdir("/usr")
+    print("make dir, usr files:{}".format(t))
+
+    if "testdir" not in t:
+        print("make dir fail")
+        return
+
+    uos.rmdir("testdir")
+    t = uos.listdir("/usr")
+    print("remove test dir, usr files:{}".format(t))
+    
+    if "testdir" in t:
+        print("remove dir fail")
+        return
+
+if __name__ == "__main__":
+    main()