brew diy command

Automagically determines prefix to install to for DIY installations.

README amended.

Library/Contributions/brew_bash_completion.sh

@@ -15,7 +15,7 @@ _brew_to_completion()
     prev="${COMP_WORDS[COMP_CWORD-1]}"
     
     # We only complete unabbreviated commands...
-    actions="edit homepage info install list link make uninstall"
+    actions="diy edit homepage info install list link make uninstall"
     
     # Subcommand list
     if [[ ( ${COMP_CWORD} -eq 1 ) && ( ${COMP_WORDS[0]} == brew )  ]] ; then

Library/Homebrew/brew.h.rb

@@ -186,6 +186,24 @@ def prune
 end
 
 
+def diy
+  path=Pathname.getwd
+  version=path.version
+  path.basename.to_s =~ /(.*?)-?#{version}/
+  name=$1
+
+  raise "Couldn't determine version, try --set-version" if version.nil? or version.empty?
+  raise "Couldn't determine name, try --set-name" if name.nil? or name.empty?
+
+  prefix=HOMEBREW_CELLAR+name+version
+
+  if File.file? 'CMakeLists.txt'
+    "-DCMAKE_INSTALL_PREFIX=#{prefix}"
+  elsif File.file? 'Makefile.am'
+    "--prefix=#{prefix}"
+  end
+end
+
 ################################################################ class Cleaner
 class Cleaner
   def initialize f

README

@@ -46,6 +46,11 @@ Here's why you may prefer Homebrew to the alternatives:
        make install
        brew ln wget
 
+   Or Homebrew can figure out the prefix:
+
+       ./configure `brew diy`
+       cmake . `brew diy`
+
    This means you can also install multiple versions of the same package and
    switch on demand.
 

bin/brew

@@ -66,6 +66,7 @@ begin
         else
           Process.wait pid
         end
+        #FIXME I don't think $? represents the exit code from the child fork…
         exit! $? if $? != 0 # exception in other brew will be visible on screen
       end
 
@@ -114,6 +115,9 @@ begin
         exec "mate", *ARGV.named.collect {|name| make name}
       end
 
+    when 'diy'
+      puts diy
+
     when 'info', 'abv'
       if ARGV.named_empty?
         puts `ls #{HOMEBREW_CELLAR} | wc -l`.strip+" kegs, "+HOMEBREW_CELLAR.abv