* luci/libs/core: add inline documentation to luci.fs, style fixups in util.lua

libs/core/luasrc/fs.lua

@@ -24,22 +24,41 @@ limitations under the License.
 
 ]]--
 
+--- LuCI filesystem library.
 module("luci.fs", package.seeall)
 
 require("posix")
 
--- Access
+--- Test for file access permission on given path.
+-- @class		function
+-- @name		access
+-- @param str	String value containing the path
+-- @return		Number containing the return code, 0 on sucess or nil on error
+-- @return		String containing the error description (if any)
+-- @return		Number containing the os specific errno (if any)
 access = posix.access
 
--- Glob
+--- Evaluate given shell glob pattern and return a table containing all matching
+-- file and directory entries.
+-- @class			function
+-- @name			glob
+-- @param filename	String containing the path of the file to read
+-- @return			Table containing file and directory entries or nil if no matches
+-- @return			String containing the error description (if no matches)
+-- @return			Number containing the os specific errno (if no matches)
 glob = posix.glob
 
--- Checks whether a file exists
+--- Checks wheather the given path exists and points to a regular file.
+-- @param filename	String containing the path of the file to read
+-- @return			Boolean indicating wheather given path points to regular file
 function isfile(filename)
 	return posix.stat(filename, "type") == "regular"
 end
 
--- Returns the content of file
+--- Read the whole content of the given file into memory.
+-- @param filename	String containing the path of the file to read
+-- @return			String containing the file contents or nil on error
+-- @return			String containing the error message on error
 function readfile(filename)
 	local fp, err = io.open(filename)
 
@@ -52,7 +71,11 @@ function readfile(filename)
 	return data
 end
 
--- Writes given data to a file
+--- Write the contents of given string to given file.
+-- @param filename	String containing the path of the file to read
+-- @param data		String containing the data to write
+-- @return			Boolean containing true on success or nil on error
+-- @return			String containing the error message on error
 function writefile(filename, data)
 	local fp, err = io.open(filename, "w")
 
@@ -66,21 +89,48 @@ function writefile(filename, data)
 	return true
 end
 
--- Returns the file modification date/time of "path"
+--- Get the last modification time of given file path in Unix epoch format.
+-- @param path	String containing the path of the file or directory to read
+-- @return		Number containing the epoch time or nil on error
+-- @return		String containing the error description (if any)
+-- @return		Number containing the os specific errno (if any)
 function mtime(path)
 	return posix.stat(path, "mtime")
 end
 
--- basename wrapper
+--- Return the last element - usually the filename - from the given path with
+-- the directory component stripped.
+-- @class		function
+-- @name		basename
+-- @param path	String containing the path to strip
+-- @return		String containing the base name of given path
+-- @see			dirname
 basename = posix.basename
 
--- dirname wrapper
+--- Return the directory component of the given path with the last element
+-- stripped of.
+-- @class		function
+-- @name		dirname
+-- @param path	String containing the path to strip
+-- @return		String containing the directory component of given path
+-- @see			basename
 dirname = posix.dirname
 
--- dir wrapper
+--- Return a table containing all entries of the specified directory.
+-- @class		function
+-- @name		dir
+-- @param path	String containing the path of the directory to scan
+-- @return		Table containing file and directory entries or nil on error
+-- @return		String containing the error description on error
+-- @return		Number containing the os specific errno on error
 dir = posix.dir
 
--- wrapper for posix.mkdir
+--- Create a new directory, recursively on demand.
+-- @param path		String with the name or path of the directory to create
+-- @param recursive	Create multiple directory levels (optional, default is true)
+-- @return			Number with the return code, 0 on sucess or nil on error
+-- @return			String containing the error description on error
+-- @return			Number containing the os specific errno on error
 function mkdir(path, recursive)
 	if recursive then
 		local base = "."
@@ -114,17 +164,49 @@ function mkdir(path, recursive)
 	end
 end
 
--- Alias for posix.rmdir
+--- Remove the given empty directory.
+-- @class		function
+-- @name		rmdir
+-- @param path	String containing the path of the directory to remove
+-- @return		Number with the return code, 0 on sucess or nil on error
+-- @return		String containing the error description on error
+-- @return		Number containing the os specific errno on error
 rmdir = posix.rmdir
 
--- Alias for posix.stat
+--- Get information about given file or directory.
+-- @class		function
+-- @name		stat
+-- @param path	String containing the path of the directory to query
+-- @return		Table containing file or directory properties or nil on error
+-- @return		String containing the error description on error
+-- @return		Number containing the os specific errno on error
 stat = posix.stat
 
--- Alias for posix.chmod
+--- Set permissions on given file or directory.
+-- @class		function
+-- @name		chmod
+-- @param path	String containing the path of the directory
+-- @param perm	String containing the permissions to set ([ugoa][+-][rwx])
+-- @return		Number with the return code, 0 on sucess or nil on error
+-- @return		String containing the error description on error
+-- @return		Number containing the os specific errno on error
 chmod = posix.chmod
 
--- Alias for posix.link
+--- Create a hardlink from given file to specified target file path.
+-- @class		function
+-- @name		link
+-- @param path1	String containing the source path of a file to hardlink
+-- @param path2	String containing the destination path for the link
+-- @return		Number with the return code, 0 on sucess or nil on error
+-- @return		String containing the error description on error
+-- @return		Number containing the os specific errno on error
 link = posix.link
 
--- Alias for posix.unlink
+--- Remove the given file.
+-- @class		function
+-- @name		unlink
+-- @param path	String containing the path of the file to remove
+-- @return		Number with the return code, 0 on sucess or nil on error
+-- @return		String containing the error description on error
+-- @return		Number containing the os specific errno on error
 unlink = posix.unlink

libs/core/luasrc/util.lua

@@ -94,7 +94,7 @@ end
 -- Scope manipulation routines
 --
 
---- Replace a function scope with a shallow copy of itself
+--- Replace a function scope with a shallow copy of itself.
 -- This is useful if you want to get rid of several unwanted side effects
 -- while changing the scope of a certain Lua function.
 -- @param f		Lua function
@@ -102,13 +102,13 @@ function resfenv(f)
 	setfenv(f, clone(getfenv(f)))
 end
 
---- Store given object associated with given key in the scope of a function
+--- Store given object associated with given key in the scope of a function.
 -- @param f		Lua function
 -- @param key	String value containg the key of the object to store
 -- @param obj	Object to store in the scope
+-- @return		Always nil
 -- @see updfenv
 -- @see resfenv
--- @return		Always nil
 function extfenv(f, key, obj)
 	local scope = getfenv(f)
 	scope[key] = obj
@@ -118,9 +118,9 @@ end
 -- @param f		Lua function
 -- @param key	String value containg the key of the object to store
 -- @param obj	Object to store in the scope
+-- @return		Always nil
 -- @see extfenv
 -- @see resfenv
--- @return		Always nil
 function updfenv(f, extscope)
 	update(getfenv(f), extscope)
 end
@@ -519,7 +519,7 @@ local oldpcall, oldxpcall = pcall, xpcall
 coxpt = {}
 setmetatable(coxpt, {__mode = "kv"})
 
--- Identity function for copcall
+--- Identity function for copcall
 local function copcall_id(trace, ...)
   return ...
 end
@@ -527,8 +527,9 @@ end
 --- This is a coroutine-safe drop-in replacement for Lua's "xpcall"-function
 -- @param f		Lua function to be called protected
 -- @param err	Custom error handler
--- @param ... parameters passed to the function
--- @return	a boolean whether the function call succeeded and the return values of either the function or the error handler
+-- @param ...	Parameters passed to the function
+-- @return		A boolean whether the function call succeeded and the return
+--				values of either the function or the error handler
 function coxpcall(f, err, ...)
 	local res, co = oldpcall(coroutine.create, f)
 	if not res then
@@ -544,13 +545,14 @@ end
 
 --- This is a coroutine-safe drop-in replacement for Lua's "pcall"-function
 -- @param f		Lua function to be called protected
--- @param ... parameters passed to the function
--- @return	a boolean whether the function call succeeded and the returns values of the function or the error object
+-- @param ...	Parameters passed to the function
+-- @return		A boolean whether the function call succeeded and the returns
+--				values of the function or the error object
 function copcall(f, ...)
 	return coxpcall(f, copcall_id, ...)
 end
 
--- Handle return value of protected call
+--- Handle return value of protected call
 function handleReturnValue(err, co, status, ...)
 	if not status then
 		return false, err(debug.traceback(co, (...)), ...)
@@ -562,7 +564,7 @@ function handleReturnValue(err, co, status, ...)
 	end
 end
 
--- Resume execution of protected function call
+--- Resume execution of protected function call
 function performResume(err, co, ...)
 	return handleReturnValue(err, co, coroutine.resume(co, ...))
 end