Trac #15808: Remove genus2reduction

genus2reduction has been ported to the PARI library and is available as
the PARI function `genus2red()`. We should remove the package and use
the new PARI function instead.

URL: http://trac.sagemath.org/15808
Reported by: jdemeyer
Ticket author(s): Jeroen Demeyer
Reviewer(s): Peter Bruin

build/deps

@@ -43,7 +43,6 @@ all-sage: \
      $(INST)/$(FLINTQS) \
      $(INST)/$(FPLLL) \
      $(INST)/$(FREETYPE) \
-     $(INST)/$(GENUS2REDUCTION) \
      $(INST)/$(GAP) \
      $(INST)/$(GD) \
      $(INST)/$(GDMODULE) \
@@ -282,9 +281,6 @@ $(INST)/$(LINBOX): $(INST)/$(MPIR) $(INST)/$(NTL) $(INST)/$(GIVARO) \
 $(INST)/$(IML): $(INST)/$(MPIR) $(INST)/$(GSL) $(INST)/$(ATLAS)
 	+$(PIPE) "$(SAGE_SPKG) $(IML) 2>&1" "tee -a $(SAGE_LOGS)/$(IML).log"
 
-$(INST)/$(GENUS2REDUCTION): $(INST)/$(PARI)
-	+$(PIPE) "$(SAGE_SPKG) $(GENUS2REDUCTION) 2>&1" "tee -a $(SAGE_LOGS)/$(GENUS2REDUCTION).log"
-
 $(INST)/$(PALP):
 	+$(PIPE) "$(SAGE_SPKG) $(PALP) 2>&1" "tee -a $(SAGE_LOGS)/$(PALP).log"
 

build/install

@@ -331,7 +331,6 @@ GAP=`newest_version gap`
 GCC=`newest_version gcc`
 GD=`newest_version gd`
 GDMODULE=`newest_version gdmodule`
-GENUS2REDUCTION=`newest_version genus2reduction`
 GFAN=`newest_version gfan`
 GF2X=`newest_version gf2x`
 GIT=`newest_version git`

src/sage/interfaces/all.py

@@ -1,4 +1,5 @@
 # interfaces to other interpreters
+from sage.misc.lazy_import import lazy_import
 
 from frobby import frobby
 from four_ti_2 import four_ti_2
@@ -7,7 +8,7 @@
 
 from gap import gap, gap_reset_workspace, gap_console, set_gap_memory_pool_size, Gap
 from gap3 import gap3, gap3_console, gap3_version, Gap3
-from genus2reduction import genus2reduction, Genus2reduction
+lazy_import('sage.interfaces.genus2reduction', ['genus2reduction', 'Genus2reduction'])
 from gfan import gfan,  Gfan
 from giac import giac, giac_console, Giac
 from gp import gp, gp_console, gp_version, Gp