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## 5.1 Compiler Utility Commands

These commands are similar to the C preprocessor in terms of purpose and functionality. They allow file inclusion, conditional compilation, executable header packing, and processes execution during the build process. Note: none of these commands allow use of variables.

### 5.1.1 !include

    [/NONFATAL] file

This command will include 'file' as if it was part of the original script. Note that if a file is included in another directory, the current directory is still where the script was compiled from (not where the included file resides). If the compiler can't find the file it will look for it in every include directory. See !addincludedir for more information. If the /nonfatal switch is used and no files are found, a warning will be issued instead of an error.

    !include WinMessages.nsh

    !include Library.nsh

    !include C:\MyConfig.nsi

    !include ..\MyConfig.nsh

    !include /NONFATAL file_that_may_exist_or_not.nsh

### 5.1.2 !addincludedir

    directory

Adds another include directory to the include directories list. This list is searched when !include is used. This list's initial value is ${NSISDIR}\Include alone.

    !addincludedir ..\include

    !include something.nsh

### 5.1.3 !addplugindir

    directory

Causes the NSIS compiler to scan the given directory for plug-in DLLs.

    !addplugindir myplugin

    MyPlugin::SomeFunction

### 5.1.4 !appendfile

    file text

Appends text to file.

    !tempfile FILE

    !appendfile "${FILE}" "XPStyle on$\n"

    !appendfile "${FILE}" "Name 'test'$\n"

    !include "${FILE}"

    !delfile "${FILE}"

    !undef FILE

### 5.1.5 !cd

    new_path

This command will change the compiler to the new directory, new_path. new_path can be relative or absolute.

    !cd ..\more-scripts\new

### 5.1.6 !delfile

    file

This command deletes a file.

    !tempfile FILE

    !delfile "${FILE}"

    !undef FILE

### 5.1.7 !echo

    message

This command will echo a message to the user compiling the script.

    !echo "hello world"

### 5.1.8 !error

    [message]

This command will issue an error to the script compiler and will stop execution of the script. You can also add a message to this error.

    !ifdef VERSION & NOVERSION

      !error "both VERSION and NOVERSION are defined"

    !endif

### 5.1.9 !execute

    command

This command will execute 'command' using a call to CreateProcess(). Unlike !system, it does not use the command line processor, so input/output redirection and commands like 'cd', 'dir' and 'type' can not be used. !execute also ignores the return value of the executed command. Currently, the only known advantage of !execute over !system is that it does not give trouble when the current working directory is specified using UNC.

On POSIX platforms, !execute will use system() just like !system.

    !execute '"%WINDIR%\notepad.exe" "${NSISDIR}\license.txt"'

### 5.1.10 !packhdr

    tempfile command

This option makes the compiler use an external EXE packer (such as Petite or UPX) to compress the executable header. Specify a temporary file name (such as "temp.dat") and a command line (such as "C:\program files\upx\upx -9 temp.dat") to compress the header.

    !packhdr "$%TEMP%\exehead.tmp" '"C:\Program Files\UPX\upx.exe" "$%TEMP%\exehead.tmp"'

### 5.1.11 !system

    command [compare comparevalue]

This command will execute 'command' using a call to system(), and if the return value compared (using 'compare') to 'comparevalue' is false, execution will halt. 'compare' can be '<' or '>' or '<>' or '='.

    !system '"%WINDIR%\notepad.exe" "${NSISDIR}\license.txt"'

    !system 'echo !define something > newinclude.nsh'

    !include newinclude.nsh

    !ifdef something

      !echo "something is defined"

    !endif

### 5.1.12 !tempfile

    symbol

This command creates a temporary file. It puts its path into a define, named symbol.

    !tempfile PACKHDRTEMP

    !packhdr "${PACKHDRTEMP}" '"C:\Program Files\UPX\upx.exe" "${PACKHDRTEMP}"'

    !tempfile FILE

    !define /date DATE "%H:%M:%S %d %b, %Y"

    !system 'echo built on ${DATE} > "${FILE}"'

    File /oname=build.txt "${FILE}"

    !delfile "${FILE}"

    !undef FILE

    !undef DATE

### 5.1.13 !warning

    [message]

This command will issue a warning to the script compiler. You can also add a message to this warning.

    !ifdef USE_DANGEROUS_STUFF

      !warning "using dangerous stuff"

    !endif

### 5.1.14 !verbose

    level | push | pop

This command will set the level of verbosity. 4=all, 3=no script, 2=no info, 1=no warnings, 0=none.

Passing push will cause !verbose to push the current verbosity level on a special stack. Passing pop will cause !verbose to pop the current verbosity level from the same stack and use it.

    !verbose push

    !verbose 1

    !include WinMessages.nsh

    !verbose pop

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