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Daniel Drake wrote: |
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> Marijn Schouten (hkBst) wrote: |
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>> use_mime() { |
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>> local WORD=$(ifv "$2" "$2" "$1") |
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>> |
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>> ifuse "$1" "${WORD};" |
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>> } |
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>> |
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>> for generating a string of ';'-separated mime-types based on use flags. |
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>> |
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>> The explanation of this function is: |
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>> |
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>> #set WORD to argument 2 or if that is empty to argument 1 |
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>> #output "${WORD};" if use flag $1 is set (or if it starts with ! and |
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>> is unset) |
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>> #otherwise don't output anything |
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> |
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> I don't quite understand what this function does. What ebuild nastiness |
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> does it replace, or what does it allow that was not previously possible? |
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> (can you give an example?) |
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|
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It's something I built following some questions by lack in #gentoo-dev-help. |
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Perhaps he can clarify if necessary. |
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|
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[di okt 30 2007] [18:02:10] |
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<lack> Now, I want to have each ebuild have a global variable called |
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'APPMIME' that somehow contains the mime-types available and the associated |
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USE flags, such that the eclass that actually creates the .desktop file can |
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appropriately go through and add only the mime-types that are enabled by the |
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USE flags. |
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<zlin> no, there is no such convenience function. |
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<lack> That's too bad - it would be pretty useful. Oh well, I'll have to |
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write some sort of fancy function in the ebuild then. |
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<hkBst> lack: what about APPMIME="thing1 $(usev thing2)" ? |
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<zlin> I you think such a flattener would be really useful I suppose you |
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can suggest it on -dev@ .. |
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<lack> hkBst: Hm, that's not too bad. |
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<zlin> *If |
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<lack> I wonder, would that work like: APPMIME="one;$(if usev |
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thing2;thing3);thing4"? |
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<lack> Maybe I'd have to do some odd escaping in that case of a |
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semicolon-separated list. |
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<hkBst> lack: why do you want it to be ;-separated? |
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<lack> Because that's the eventual format of 'MIME=type/one;type/two' in |
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the .desktop file. |
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<lack> If I could just set up the variable so the eclass doesn't have to |
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actually do any parsing that would be easiest. |
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<lack> APPMIME="type/one;type/two$(if use foo ';type/foo1;type/foo2')$(if |
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use bar ';type/barx;type/bary')" Perhaps? |
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<zlin> usemime() { useq $1 && echo "$2;"; }; APPMIME="thing1;$(usemime |
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useflag thing2)$(usemime useflag2 "thing3;thing4")thing5" |
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<lack> Ah, that usemime feature looks useful, thanks! |
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|
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But |
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|
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usemime() { useq $1 && echo "$2;"; } |
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|
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lacks default arguments and ifuse provides a nicer interface if you want to do |
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output, which is the use case I am proposing ifuse for. |
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|
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Some other examples: |
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|
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in dev-scheme/bigloo-3.0b_p2 I use (econf doesn't work): |
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|
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./configure \ |
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$(use java && echo "--jvm=yes --java=$(java-config --java) |
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- --javac=$(java-config --javac)") \ |
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- --prefix=/usr \ |
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# --bee=$(if use fullbee; then echo full; else echo partial; fi) |
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|
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it would be a bit nicer if I could just write: |
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|
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./configure \ |
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$(ifuse java "--jvm=yes --java=$(java-config --java) --javac=$(java-config |
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- --javac)") \ |
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- --prefix=/usr \ |
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# --bee=$(ifuse fullbee full partial) |
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|
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The example from |
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<http://www.gentoo.org/proj/en/devrel/handbook/handbook.xml?part=2&chap=1> |
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|
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if use gnutls ; then |
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myconf="${myconf} --enable-ssl --with-ssl=gnutls" |
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elif use ssl ; then |
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myconf="${myconf} --enable-ssl --with-ssl=openssl" |
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else |
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myconf="${myconf} --disable-ssl" |
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fi |
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|
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econf \ |
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# Other stuff |
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${myconf} \ |
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|| die "configure failed" |
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|
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could become: |
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|
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econf \ |
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# Other stuff |
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$(ifuse gnutls "--enable-ssl --with-ssl=gnutls" \ |
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$(ifuse ssl "--enable-ssl --with-ssl=openssl" --disable-ssl)) \ |
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|| die "configure failed" |
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|
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which may require some getting used to. But no functionality will be lost, so |
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if you prefer the old way, all your existing methods will continue to work. |
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There will just be another option. |
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|
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Marijn |
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|
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- -- |
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Marijn Schouten (hkBst), Gentoo Lisp project |
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<http://www.gentoo.org/proj/en/lisp/>, #gentoo-lisp on FreeNode |
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