generate.bat: Use buildconf.bat for prerequisite file generation

  rem Check we are running from a curl git repository

  if not exist ..\GIT-INFO goto norepo

  rem Detect programs. HAVE_<PROGNAME>

  rem When not found the variable is set undefined. The undefined pattern

  rem allows for statements like "if not defined HAVE_PERL (command)"

  groff --version <NUL 1>NUL 2>&1

  if %ERRORLEVEL% equ 0 (set HAVE_GROFF=Y) else (set HAVE_GROFF=)

  nroff --version <NUL 1>NUL 2>&1

  if %ERRORLEVEL% equ 0 (set HAVE_NROFF=Y) else (set HAVE_NROFF=)

  perl --version <NUL 1>NUL 2>&1

  if %ERRORLEVEL% equ 0 (set HAVE_PERL=Y) else (set HAVE_PERL=)

  gzip --version <NUL 1>NUL 2>&1

  if %ERRORLEVEL% equ 0 (set HAVE_GZIP=Y) else (set HAVE_GZIP=)

:parseArgs

  if "%~1" == "" goto start

  ) else (

    goto unknown

  )

  shift & goto parseArgs

:start

  if "%MODE%" == "GENERATE" (

    echo.

    echo Generating prerequisite files

    call :gen_curlbuild

    if errorlevel 1 goto nogencurlbuild

    call :gen_hugehelp

    if errorlevel 1 goto nogenhugehelp

    call ..\buildconf

  ) else if "%VERSION%" == "PRE" (

    call ..\buildconf -clean

  ) else if "%VERSION%" == "ALL" (

    call ..\buildconf -clean

  )

  exit /B

rem CALL this function to generate ..\src\tool_hugehelp.c

rem Returns exit code 0 on success or 1 on failure.

:gen_hugehelp

  setlocal

  set LC_ALL=C

  set ROFFCMD=

  if defined HAVE_PERL (

    if defined HAVE_GROFF (

      set ROFFCMD=groff -mtty-char -Tascii -P-c -man

    ) else if defined HAVE_NROFF (

      set ROFFCMD=nroff -c -Tascii -man

    )

  )

  echo * %CD%\..\src\tool_hugehelp.c

  echo #include "tool_setup.h"> ..\src\tool_hugehelp.c

  echo #include "tool_hugehelp.h">> ..\src\tool_hugehelp.c

  if defined ROFFCMD (

    if defined HAVE_GZIP (

      echo #ifndef HAVE_LIBZ>> ..\src\tool_hugehelp.c

    )

    %ROFFCMD% ..\docs\curl.1 2>NUL | perl ..\src\mkhelp.pl ..\docs\MANUAL >> ..\src\tool_hugehelp.c

    if defined HAVE_GZIP (

      echo #else>> ..\src\tool_hugehelp.c

      %ROFFCMD% ..\docs\curl.1 2>NUL | perl ..\src\mkhelp.pl -c ..\docs\MANUAL >> ..\src\tool_hugehelp.c

      echo #endif /^* HAVE_LIBZ ^*/>> ..\src\tool_hugehelp.c

    )

  ) else (

    echo.

    echo Warning: The curl manual could not be integrated in the source. This means when

    echo you build curl the manual will not be available (curl --man^). Integration of

    echo the manual is not required and a summary of the options will still be available

    echo (curl --help^). To integrate the manual your PATH is required to have

    echo groff/nroff, perl and optionally gzip for compression.

    echo.

    echo void hugehelp(void^)>> ..\src\tool_hugehelp.c

    echo #ifdef USE_MANUAL>> ..\src\tool_hugehelp.c

    echo { fputs("built-in manual not included\n", stdout^); }>> ..\src\tool_hugehelp.c

    echo #else>> ..\src\tool_hugehelp.c

    echo {}>> ..\src\tool_hugehelp.c

    echo #endif>> ..\src\tool_hugehelp.c

  )

  findstr "/C:void hugehelp(void)" ..\src\tool_hugehelp.c 1>NUL 2>&1

  if %ERRORLEVEL% neq 0 (

    exit /B 1

  )

  exit /B 0

rem CALL this function to generate ..\include\curl\curlbuild.h

rem Returns exit code 0 on success or 1 on failure.

:gen_curlbuild

  setlocal

  echo * %CD%\..\include\curl\curlbuild.h

  copy /y ..\include\curl\curlbuild.h.dist ..\include\curl\curlbuild.h 1>NUL

  if %ERRORLEVEL% neq 0 (

    exit /B 1

  )

  exit /B 0

:syntax

  rem Display the help

  echo.

  echo Error: This batch file should only be used from a curl git repository

  goto error

:nogencurlbuild

  echo.

  echo Error: Unable to generate ..\include\curl\curlbuild.h

  goto error

:nogenhugehelp

  echo.

  echo Error: Unable to generate ..\src\tool_hugehelp.c

  goto error

:seterr

  rem Set the caller's errorlevel.

  rem %1[opt]: Errorlevel as integer.