#!/usr/bin/tclsh## To build a single huge source file holding all of SQLite (or at# least the core components - the test harness, shell, and TCL # interface are omitted.) first do##      make target_source## The make target above moves all of the source code files into# a subdirectory named "tsrc".  (This script expects to find the files# there and will not work if they are not found.)  There are a few# generated C code files that are also added to the tsrc directory.# For example, the "parse.c" and "parse.h" files to implement the# the parser are derived from "parse.y" using lemon.  And the # "keywordhash.h" files is generated by a program named "mkkeywordhash".## After the "tsrc" directory has been created and populated, run# this script:##      tclsh mksqlite3c.tcl## The amalgamated SQLite code will be written into sqlite3.c## Begin by reading the "sqlite3.h" header file.  Count the number of lines# in this file and extract the version number.  That information will be# needed in order to generate the header of the amalgamation.#set in [open tsrc/sqlite3.h]set cnt 0set VERSION ?????while {![eof $in]} {  set line [gets $in]  if {$line=="" && [eof $in]} break  incr cnt  regexp {#define\s+SQLITE_VERSION\s+"(.*)"} $line all VERSION}close $in# Open the output file and write a header comment at the beginning# of the file.#set out [open sqlite3internal.h w]set today [clock format [clock seconds] -format "%Y-%m-%d %H:%M:%S UTC" -gmt 1]puts $out [subst \{/******************************************************************************** This file is an amalgamation of many private header files from SQLite** version $VERSION. */}]# These are the header files used by SQLite.  The first time any of these # files are seen in a #include statement in the C code, include the complete# text of the file in-line.  The file only needs to be included once.#foreach hdr {   btree.h   btreeInt.h   hash.h   keywordhash.h   opcodes.h   os_common.h   os.h   os_os2.h   pager.h   parse.h   sqlite3ext.h   sqlite3.h   sqliteInt.h   sqliteLimit.h   vdbe.h   vdbeInt.h} {  set available_hdr($hdr) 1}# 78 stars used for comment formatting.set s78 \{*****************************************************************************}# Insert a comment into the code#proc section_comment {text} {  global out s78  set n [string length $text]  set nstar [expr {60 - $n}]  set stars [string range $s78 0 $nstar]  puts $out "/************** $text $stars/"}# Read the source file named $filename and write it into the# sqlite3.c output file.  If any #include statements are seen,# process them approprately.#proc copy_file {filename} {  global seen_hdr available_hdr out  set tail [file tail $filename]  section_comment "Begin file $tail"  set in [open $filename r]  while {![eof $in]} {    set line [gets $in]    if {[regexp {^#\s*include\s+["<]([^">]+)[">]} $line all hdr]} {      if {[info exists available_hdr($hdr)]} {        if {$available_hdr($hdr)} {          section_comment "Include $hdr in the middle of $tail"          copy_file tsrc/$hdr          section_comment "Continuing where we left off in $tail"        }      } elseif {![info exists seen_hdr($hdr)]} {        set seen_hdr($hdr) 1        puts $out $line      }    } elseif {[regexp {^#ifdef __cplusplus} $line]} {      puts $out "#if 0"    } elseif {[regexp {^#line} $line]} {      # Skip #line directives.    } else {      puts $out $line    }  }  close $in  section_comment "End of $tail"}# Process the source files.  Process files containing commonly# used subroutines first in order to help the compiler find# inlining opportunities.#foreach file {   sqliteInt.h   sqlite3.h   btree.h   hash.h   os.h   pager.h   parse.h   sqlite3ext.h   vdbe.h} {  if {$available_hdr($file)} {    copy_file tsrc/$file  }}close $out