require 'formula'

class SqliteFunctions < Formula
  url 'http://www.sqlite.org/contrib/download/extension-functions.c?get=25', :using  => :nounzip
  sha1 'c68fa706d6d9ff98608044c00212473f9c14892f'
  version '2010-01-06'
end

class SqliteDocs < Formula
  url 'http://www.sqlite.org/2013/sqlite-doc-3071700.zip'
  version '3.7.17'
  sha1 '6b533b0a9a21eb2c2d1c9f278b8defbeb5a432a7'
end

class Sqlite < Formula
  homepage 'http://sqlite.org/'
  url 'http://sqlite.org/2013/sqlite-autoconf-3071700.tar.gz'
  version '3.7.17'
  sha1 'e31958e56b1d7bef9433b1ff2e875c8c290d37f4'

  depends_on 'readline' => :recommended

  option :universal
  option 'with-docs', 'Install HTML documentation'
  option 'without-rtree', 'Disable the R*Tree index module'
  option 'with-fts', 'Enable the FTS module'
  option 'with-functions', 'Enable more math and string functions for SQL queries'

  keg_only :provided_by_osx, "OS X already provides (an older) sqlite3."

  def install
    ENV.append 'CPPFLAGS', "-DSQLITE_ENABLE_RTREE" unless build.without? "rtree"
    ENV.append 'CPPFLAGS', "-DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS" if build.with? "fts"

    # enable these options by default
    ENV.append 'CPPFLAGS', "-DSQLITE_ENABLE_COLUMN_METADATA"
    ENV.append 'CPPFLAGS', "-DSQLITE_ENABLE_STAT3"

    ENV.universal_binary if build.universal?

    system "./configure", "--prefix=#{prefix}", "--disable-dependency-tracking", "--enable-dynamic-extensions"
    system "make install"

    if build.with? "functions"
      SqliteFunctions.new.brew { mv 'extension-functions.c?get=25', buildpath/'extension-functions.c' }
      system ENV.cc, "-fno-common",
                     "-dynamiclib",
                     "extension-functions.c",
                     "-o", "libsqlitefunctions.dylib",
                     *ENV.cflags.split
      lib.install "libsqlitefunctions.dylib"
    end

    SqliteDocs.new.brew { doc.install Dir['*'] } if build.with? "docs"
  end

  def caveats
    if build.with? 'functions' then <<-EOS.undent
      Usage instructions for applications calling the sqlite3 API functions:

        In your application, call sqlite3_enable_load_extension(db,1) to
        allow loading external libraries.  Then load the library libsqlitefunctions
        using sqlite3_load_extension; the third argument should be 0.
        See http://www.sqlite.org/cvstrac/wiki?p=LoadableExtensions.
        Select statements may now use these functions, as in
        SELECT cos(radians(inclination)) FROM satsum WHERE satnum = 25544;

      Usage instructions for the sqlite3 program:

        If the program is built so that loading extensions is permitted,
        the following will work:
         sqlite> SELECT load_extension('#{lib}/libsqlitefunctions.dylib');
         sqlite> select cos(radians(45));
         0.707106781186548
      EOS
    end
  end
end