1 files changed, 80 insertions, 0 deletions
diff --git a/scripts/context/ruby/www/common.rb b/scripts/context/ruby/www/common.rb
new file mode 100644
index 000000000..9c3832294
--- /dev/null
+++ b/scripts/context/ruby/www/common.rb
@@ -0,0 +1,80 @@
+# We cannot chdir in threads because it is something
+# process wide, so we will run into problems with the
+# other threads. The same is true for the global ENV
+# pseudo hash, so we cannot communicate the runpath
+# via an anvironment either. This leaves texmfstart
+# in combination with a path directive and an tmf file.
+
+module Common # can be a mixin
+
+    # we assume that the hash.subset method is defined
+
+    @@re_texmfstart = /^(texmfstart|ruby\s*texmfstart.rb)\s*(.*)$/
+    @@re_texmfpath  = /^\-\-path\=/
+
+    def command_string(path,command,log='')
+        runner = "texmfstart --path=#{File.expand_path(path)}"
+        if command =~ @@re_texmfstart then
+            cmd, arg = $1, $2
+            if arg =~ @@re_texmfpath then
+                # there is already an --path (first switch)
+            else
+                command = "#{runner} #{arg}"
+            end
+        else
+            command = "#{runner} bin:#{command}"
+        end
+        if log && ! log.empty? then
+            return "#{command} 2>&1 > #{File.expand_path(File.join(path,log))}"
+        else
+            return command
+        end
+    end
+
+    def set_os_vars
+        begin
+            ENV['TEXOS'] = ENV['TEXOS'] || platform
+        rescue
+            ENV['TEXOS'] = 'texmf-linux'
+        else
+            ENV['TEXOS'] = 'texmf-' + ENV['TEXOS'] unless ENV['TEXOS'] =~ /^texmf\-/
+        ensure
+            ENV['EXA:TEXOS'] = ENV['TEXOS']
+        end
+    end
+
+    def set_environment(hash)
+        set_os_vars
+        paths = ENV['PATH'].split(File::PATH_SEPARATOR)
+        hash.subset('binpath:').keys.each do |key|
+            begin
+                paths << File.expand_path(hash[key])
+            rescue
+            end
+        end
+        ENV['PATH'] = paths.uniq.join(File::PATH_SEPARATOR)
+        hash.subset('path:').keys.each do |path|
+            key, value = "EXA:#{path.upcase}", File.expand_path(hash[path])
+            ENV[key] = value
+        end
+    end
+
+    def save_environment(hash,path,filename='request.tmf')
+        begin
+            File.open(File.join(path,filename),'w') do |f|
+                set_os_vars
+                ['EXA:TEXOS','TEXOS'].each do |key|
+                    f.puts("#{key} = #{ENV[key]}")
+                end
+                hash.subset('binpath:').keys.each do |key|
+                    f.puts("PATH < #{File.expand_path(@interface.get(key))}")
+                end
+                hash.subset('path:').keys.each do |path|
+                    f.puts("EXA:#{path.upcase} = #{File.expand_path(@interface.get(path))}")
+                end
+            end
+        rescue
+        end
+    end
+
+end