More advanced replace text in file

Author: Afrow UK (talk, contrib)

Description

This function allows you to replace pieces of text in a file. Instead of replacing all text found in the file, you have the extra option of replacing text after the x times of it occurring, and x times to replace the text after that occurrence. Just copy the full code underneath in a file named: ReplaceInFile3.nsh and save it in the Include folder of your NSIS installation folder.

Usage 1

Push hello #text to be replaced
Push blah #replace with
Push 3 #start replacing after 3rd occurrence
Push 4 #replace next 4 occurrences
Push C:\temp1.bat #file to replace in
 Call AdvReplaceInFile

Usage 2

Push hello #text to be replaced
Push blah #replace with
Push 3 #start replacing after 3rd occurrence
Push all #replace all other occurrences
Push C:\temp1.bat #file to replace in
 Call AdvReplaceInFile

Usage 3

Push hello #text to be replaced
Push blah #replace with
Push all #replace all occurrences
Push all #replace all occurrences
Push C:\temp1.bat #file to replace in
 Call AdvReplaceInFile

/* First occurrence to be replaced: FST_OCC. FST_OCC = all, is the same as FST_OCC = 1.

  if FST_OCC greater than the number of occurences: no alteration of the file

Nr max of occurrences replaced onwards: NR_OCC,

  if NR_OCC = all --> replacement as long as a string to be replaced is found
  if NR_OCC = integer, replaces up to NR_OCC occurrences provided they exist   

NR_OCC, FST_OCC negative will yield the same result as NR_OCC, FST_OCC equal to all.

Order to run down and search the file: from left to right and top down. REPLACEMENT_STR, OLD_STR should be less than 1024 characters long.

• /

Var /Global OLD_STR Var /Global FST_OCC Var /Global NR_OCC Var /Global REPLACEMENT_STR Var /Global FILE_TO_MODIFIED

!macro ReplaceInFile OLD_STR FST_OCC NR_OCC REPLACEMENT_STR FILE_TO_MODIFIED

   Push "${OLD_STR}" ;text to be replaced

Push "${REPLACEMENT_STR}" ;replace with Push "${FST_OCC}" ; start replacing after FST_OCC occurrences Push "${NR_OCC}" ; replace NR_OCC occurrences in all Push "${FILE_TO_MODIFIED}" ; file to replace in Call AdvReplaceInFile

!macroend

Function AdvReplaceInFile Exch $0 ;FILE_TO_MODIFIED file to replace in Exch Exch $1 ;the NR_OCC of OLD_STR occurrences to be replaced. Exch Exch 2 Exch $2 ;FST_OCC: the first occurrence to be replaced and onwards Exch 2 Exch 3 Exch $3 ;REPLACEMENT_STR string to replace with Exch 3 Exch 4 Exch $4 ;OLD_STR to be replaced Exch 4 Push $5 ;incrementing counter Push $6 ;a chunk of read line Push $7 ;the read line altered or not Push $8 ;left string Push $9 ;right string or forster read line Push $R0 ;temp file handle Push $R1 ;FILE_TO_MODIFIED file handle Push $R2 ;a line read Push $R3 ;the length of OLD_STR Push $R4 ;counts reaching of FST_OCC Push $R5 ;counts reaching of NR_OCC Push $R6 ;temp file name

 GetTempFileName $R6
 
 FileOpen $R1 $0 r 			;FILE_TO_MODIFIED file to search in
 FileOpen $R0 $R6 w ;temp file
  StrLen $R3 $4			;the length of OLD_STR
  StrCpy $R4 0				;counter initialization
  StrCpy $R5 -1			;counter initialization

loop_read:

ClearErrors
FileRead $R1 $R2 			;reading line
IfErrors exit				;when end of file has been reached

  StrCpy $5 -1  			;cursor, start of read line chunk
  StrLen $7 $R2 			;reading line length
  IntOp $5 $5 - $7			;cursor initialization
  StrCpy $7 $R2			;$7 contains read line

loop_filter:

  IntOp $5 $5 + 1 			;cursor shifting
  StrCmp $5 0 file_write		;end of line has been reached
  StrCpy $6 $7 $R3 $5 			;a chunk of read line of length OLD_STR 
  StrCmp $6 $4 0 loop_filter		;continues searching OLD_STR if no match

StrCpy $8 $7 $5 ;left part IntOp $6 $5 + $R3 IntCmp $6 0 yes no ;left part + OLD_STR == full line read ? yes: StrCpy $9 "" Goto done no: StrCpy $9 $7 "" $6 ;right part done: StrCpy $9 $8$3$9 ;replacing OLD_STR by REPLACEMENT_STR in forster read line

IntOp $R4 $R4 + 1 ;counter incrementation

MessageBox MB_OK|MB_ICONINFORMATION \

"count 4 = $R4, fst_occ = $2"

StrCmp $2 all follow_up ;exchange ok, then goes to search the next OLD_STR IntCmp $R4 $2 follow_up ;no exchange until FST_OCC has been reached, Goto loop_filter ;and then searching for the next OLD_STR

follow_up: IntOp $R4 $R4 - 1 ;now counter is to be stuck to FST_OCC

IntOp $R5 $R5 + 1 ;counter incrementation

MessageBox MB_OK|MB_ICONINFORMATION \

"count 5 = $R5, nbr_occ = $1"

StrCmp $1 all exchange_ok ;goes to exchange OLD_STR with REPLACEMENT_STR IntCmp $R5 $1 finalize ;proceeding exchange until NR_OCC has been reached

exchange_ok: IntOp $5 $5 + $R3 ;updating counter StrCpy $7 $9 ;updating line read with forster read line Goto loop_filter ;goes searching the same read line

finalize: IntOp $R5 $R5 - 1 ;now counter is to be stuck to NR_OCC

file_write:

FileWrite $R0 $7 			;writes altered or unaltered line 

Goto loop_read ;reads the next line

exit:

 FileClose $R0
 FileClose $R1

  ;SetDetailsPrint none
 Delete $0
 Rename $R6 $0				;superseding FILE_TO_MODIFIED file with

;temp file built with REPLACEMENT_STR

 ;Delete $R6
  ;SetDetailsPrint lastused

Pop $R6 Pop $R5 Pop $R4 Pop $R3 Pop $R2 Pop $R1 Pop $R0 Pop $9 Pop $8 Pop $7 Pop $6 Pop $5

These values are stored in the stack in the reverse order they were pushed

Pop $0 Pop $1 Pop $2 Pop $3 Pop $4 FunctionEnd

Versions History

2010-10-09

Bug fixed that doesn't change "all" occurrences

2006-09-28

Bug fixed that restoring $0~$4 order -- Maxi Ng

2005-July-18

Bug fixed that doesn't replace a text when you have only 1 line in the text file - Mark Bryan Yu

2004-Feb-18

Bug fixed that stopped it replacing parts of text on a line. The bug was only allowing it to replace whole lines.

2003-May-27

Re-written.

Credits

Written by me for modifying batch files.

-Stu (Afrow UK)