Makefile rule for cropping the PDF to extract small parts of the article

.gitignore

@@ -1,4 +1,7 @@
 /deques
 /deques.cmi
 /deques.cmo
-/deques.mli
+/deques.mli
+/jacm-final.pdf
+/jacm-final-page*.pdf
+/jacm-final-crop-*-*-*-*-page*.pdf

.travis.yml

@@ -1,9 +1,12 @@
+sudo: false
 language: c
 
 addons:
   apt:
     packages:
-      - ocaml-interp
+      - ocaml
+      - ocaml-findlib
+      - libpodofo-utils
 
 script:
   - make print-tool-versions

Makefile

@@ -1,3 +1,5 @@
+.SECONDEXPANSION:
+
 .PHONY: all
 all: deques deques.mli Makefile
 
@@ -8,5 +10,29 @@ deques.mli: deques.ml Makefile
 	ocamlc -i $< > $@
 
 .PHONY: print-tool-versions
-print-tool-versions:
+print-tool-versions: Makefile
 	ocamlc -version
+
+jacm-final.pdf: Makefile
+	wget http://www.math.tau.ac.il/~haimk/adv-ds-2000/jacm-final.pdf
+
+#sudo apt-get install libpodofo-utils to get podofobox
+jacm-final-page%.pdf: jacm-final.pdf Makefile
+	pdftk P=$< cat P$* output $@
+
+# jacm-final-crop-LEFT-TOP-WIDTH-HEIGHT-pagePAGE.pdf
+# Original page width: 488, original page height: 721.
+# podofobox expects LEFT BOTTOM WIDTH HEIGHT, multiplied by 100.
+jacm-final-crop-%.pdf: $$(shell echo '%.pdf' | sed -e 's/^[-0-9]*-page/jacm-final-page/')
+	f () { \
+	  podofobox $< $@ \
+	    media $$(( ($$1) * 100 )) \
+	          $$(( ( 720 - ($$2) - ($$4) ) * 100 )) \
+	          $$(( ($$3) * 100 )) \
+	          $$(( ($$4) * 100 )); \
+        }; \
+        f $$(echo '$*' | sed -e 's/page[0-9]*$$//' -e 's/-/ /g')
+
+.PHONY: clean
+clean: Makefile
+	rm jacm-final-page*.pdf jacm-final-crop-*-page*.pdf