Dealing with weird versioning

Question

Hi,
I'm making a PKGBUILD for EiffelStudio, a IDE for the Eiffel language. Everything works fine so far, however the versioning scheme and package URL are kind of weird. For example, the current version of the tarball is called "Eiffel66_gpl_82484-linux-x86-64.tar.bz2". This actually stands for "EiffelStudio version 6.6 build 82484", which can be deduced from the download link in the PKGBUILD provided below. Now, should I name the package "eiffel66" with version number 82484 or name it "eiffel" version 6.6.82484 and somehow find a way to derive the tarball's name from that? If so, how would I go about doing that? Can I use sed directly in the "source=()" tag?
Also, how can I match the required dependency versions with the ones provided by arch? The website states that EiffelStudio needs glibc>=2.3 and gtk+>=2.4, but my up-to-date system says I have glibc-2.11.1-1 and gtk2-2.18.7-1 installed. I have a feeling that the versioning scheme is somehow different here, as everything works just fine when installed.
# Contributor: Your Name <[email protected]>
pkgname=eiffel66
pkgver=82484
pkgrel=1
pkgdesc="EiffelStudio Integrated Development Environment"
arch=('i686' 'x86_64')
[ $CARCH = 'x86_64' ] && _arch='x86-64'
[ $CARCH = 'i686' ] && _arch='x86'
url="http://dev.eiffel.com/Main_Page"
license=('GPL')
groups=()
depends=('glibc>=2.11.0' 'gtk2>=2.18.0')
makedepends=('cpio')
provides=()
conflicts=()
replaces=()
backup=()
install=
source=("http://heanet.dl.sourceforge.net/project/eiffelstudio/EiffelStudio 6.6 (devel)/Build_$pkgver/Eiffel66_gpl_$pkgver-linux-$_arch.tar.bz2")
noextract=()
[ $CARCH = 'x86_64' ] && md5sums=('87e618ed718a6440c5a44dab98586cec')
[ $CARCH = 'i686' ] && md5sums=('70e39254a78e47725b347e54ee39d10b')
build() {
cd "$srcdir/Eiffel66"
mkdir -p $pkgdir/opt/$pkgname
mkdir -p $pkgdir/usr/bin
cat > $pkgdir/usr/bin/estudio << _EOF
#!/bin/sh
export ISE_EIFFEL=/opt/$pkgname
export ISE_PLATFORM=linux-$_arch
export PATH=$PATH:$ISE_EIFFEL/studio/spec/$ISE_PLATFORM/bin
/opt/$pkgname/studio/spec/linux-$_arch/bin/estudio
_EOF
chmod 755 $pkgdir/usr/bin/estudio
export ISE_EIFFEL=$srcdir/Eiffel66
export ISE_PLATFORM=linux-$_arch
export PATH=$PATH:$ISE_EIFFEL/studio/spec/$ISE_PLATFORM/bin
yes | ./make_install || return 1
find . | cpio -p -dum $pkgdir/opt/$pkgname || return 1

Answer 1

@Snowman: thanks for pointing out that it's possible to do RE directly in bash. That's pretty neat, but I'll have to play around with it a bit more.
@brisbin33: Now I'm embarrassed   3 is definitively less or equal to 11. That's one brainfart I'll try to avoid in future.
Here's the latest revision, in case anyone want's to try this out. I'm not quite happy with it yet, but I'm getting there.
# Contributor: Your Name <[email protected]>
pkgname=eiffel
pkgver=66.82484
pkgrel=1
pkgdesc="EiffelStudio Integrated Development Environment"
arch=('i686' 'x86_64')
[ $CARCH = 'x86_64' ] && _arch='x86-64'
[ $CARCH = 'i686' ] && _arch='x86'
url="http://dev.eiffel.com/Main_Page"
license=('GPL')
groups=()
depends=('glibc>=2.3' 'gtk2>=2.4')
makedepends=('cpio')
provides=()
conflicts=()
replaces=()
backup=()
install=
source=("http://heanet.dl.sourceforge.net/project/eiffelstudio/EiffelStudio 6.6 (devel)/Build_${pkgver##*.}/${pkgname^e}${pkgver%.*}_gpl_${pkgver##*.}-linux-$_arch.tar.bz2")
noextract=()
[ $CARCH = 'x86_64' ] && md5sums=('87e618ed718a6440c5a44dab98586cec')
[ $CARCH = 'i686' ] && md5sums=('70e39254a78e47725b347e54ee39d10b')
build() {
cd "$srcdir/${pkgname^e}${pkgver%.*}"
mkdir -p $pkgdir/opt/$pkgname
mkdir -p $pkgdir/usr/bin
cat > $pkgdir/usr/bin/estudio << _EOF
#!/bin/sh
export ISE_EIFFEL=/opt/$pkgname
export ISE_PLATFORM=linux-$_arch
export PATH=$PATH:$ISE_EIFFEL/studio/spec/$ISE_PLATFORM/bin
/opt/$pkgname/studio/spec/linux-$_arch/bin/estudio
_EOF
chmod 755 $pkgdir/usr/bin/estudio
export ISE_EIFFEL=$srcdir/${pkgname^e}${pkgver%.*}
export ISE_PLATFORM=linux-$_arch
export PATH=$PATH:$ISE_EIFFEL/studio/spec/$ISE_PLATFORM/bin
yes | ./make_install || return 1
find . | cpio -p -dum $pkgdir/opt/$pkgname || return 1