Remove Extra Line Breaks and Load

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#pragma rtGlobals=1		// Use modern global access method.
 
//	This is an illustration of loading data from a weird file format.
//
//	In some cases, the simplest approach is to create a cleaned-up version of the file
//	as a temporary file and then to load the data from that.
//
//	In this example, the file has line unwanted line breaks represented by consecutive
//	carriage returns, linefeeds or carriage-return/linefeed pairs.
//
//	We create a temporary file with the extra line breaks removed and load the temporary file.
//	You will need to tweak this for your own situation.
//
//	Please read the code and comments below before using or tweaking for your data file.
 
Menu "Load Waves"
	"Remove Extra Line Breaks and Load...", RemoveExtraLineBreaksAndLoad("", "")
End
 
//	FixText(textIn)
//	Returns cleaned up version of text without extra line breaks.
//	Handles carriage returns (CR), linefeeds (LF) and carriage-return/linefeed (CRLF) terminators.
//	To keep it simple, this routine assumes that there is at most one extra line break
//	between each valid line.
//	NOTE: You may need to tweak this for your situation.
static Function/S FixText(textIn)
	String textIn
 
	String textOut = textIn
 
	textOut = ReplaceString("\r\r", textOut, "\r")			// Replace double CRs with one CR
 
	textOut = ReplaceString("\n\n", textOut, "\n")		// Replace double LFs with one LF
 
	textOut = ReplaceString("\r\n\r\n", textOut, "\r\n")	// Replace double CRLFs with one CRLF
 
	return textOut
End
 
//	RemoveExtraLineBreaksAndLoad(pathName, fileName)
//	This routine creates a temporary version of the file without the extra line breaks
//	and loads data from the temporary file.
Function RemoveExtraLineBreaksAndLoad(pathName, fileName)
	String pathName		// Name of an Igor symbolic path or "".
	String fileName			// Name of file or full path to file.
 
	Variable refNum
 
	// First get a valid reference to a file.
	if ((strlen(pathName)==0) || (strlen(fileName)==0))
		// Display dialog looking for file.
		// Replace /T="????" with, for example, /T=".dat" if your files are .dat files.
		Open /D /R /P=$pathName /T="????" refNum as fileName
		fileName = S_fileName			// S_fileName is set by Open/D
		if (strlen(fileName) == 0)		// User cancelled?
			return -1
		endif
	endif
 
	// Open source file and read the raw text from it into a string variable
	Open/Z=1/R/P=$pathName refNum as fileName
	if (V_flag != 0)
		return -1						// Error of some kind
	endif
	FStatus refNum						// Sets V_logEOF
	Variable numBytesInFile = V_logEOF
	String text = PadString("", numBytesInFile, 0x20)
	FBinRead refNum, text				// Read entire file into variable.
	Close refNum
 
	// Fix the text
	text = FixText(text)					// Remove extra line breaks
 
	// Write the fixed text to a temporary file
	String tempFileName = fileName + ".noindex"	// Use of .noindex prevents Spotlight from indexing the file. Otherwise we get an error when we try to delete the file because Spotlight has it open.
	Open refNum as tempFileName
	FBinWrite refNum, text
	Close refNum	
 
	// Load the temporary file
	// NOTE: You will need to tweak this for your situation
	// If you have string or date/time columns you will need to use LoadWave/J instead of /G.
	LoadWave/G/D/E=1/Q/P=$pathName tempFileName
	if (V_flag == 0)
		Printf "An error occurred while loading data from \"%s\"\r", S_fileName
	else
		Printf "Loaded data from \"%s\"\r", S_fileName
	endif
 
	// Delete the temporary file	
	DeleteFile /P=$pathName tempFileName
 
	return 0
End

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