2017-08-21: implement evaluation for the r7rs benchmarks

implement evaluation for the r7rs benchmarks

diff --git a/examples/evaluate-r7rs-benchmark.w b/examples/evaluate-r7rs-benchmark.w
new file mode 100755
--- /dev/null
+++ b/examples/evaluate-r7rs-benchmark.w
@@ -0,0 +1,105 @@
+#!/bin/sh
+# -*- wisp -*-
+exec guile -L ~/wisp --language=wisp -s $0 "$@"
+!#
+
+;; Evaluate the benchmarks from ecraven at http://ecraven.github.io/r7rs-benchmarks/benchmark.html
+;; Uses data from http://ecraven.github.io/r7rs-benchmarks/all.csv
+
+import : ice-9 rdelim
+         srfi srfi-1
+         ice-9 pretty-print
+         ice-9 optargs
+         ice-9 i18n
+
+define : read-csv port
+    let loop : : lines '()
+        if : eof-object? : peek-char port 
+           reverse : map (λ (x) (string-split x #\,)) lines
+           loop : cons (read-line port) lines
+
+define : min-alist-by-test data-by-project
+    let lp 
+        : min-data '()
+          data-by-project data-by-project
+        if : null? data-by-project
+           . min-data
+           let*
+             : proj : car : car data-by-project
+               test : car : cdr : car data-by-project
+               time : string->number : car : cdr : cdr : car data-by-project
+               best : assoc-ref min-data test
+             lp
+                if : and time : or (not best) : < time best
+                   assoc-set! min-data test time
+                   . min-data
+                cdr data-by-project
+
+define : select-project-data data-by-project project
+       define : notproj? datapoint
+              not : string-prefix? project : car datapoint
+       define : only-project data
+              remove notproj? data
+       map cdr : only-project data-by-project
+
+define : get-multiples guile-data data-min-by-test
+  let lp 
+      : gd guile-data
+        multiples-of-best '()
+      if : null? gd
+         remove (λ(x) (equal? #f x)) multiples-of-best
+         let*
+             : guile : string->number : car : cdr : car gd
+               test : car : car gd
+               multiple
+                 if : not guile
+                    . guile
+                    / guile
+                      or (assoc-ref data-min-by-test test) guile
+             lp : cdr gd
+                  if multiple
+                     cons multiple multiples-of-best
+                     . multiples-of-best
+
+
+define : help args
+    format #t "Usage: ~a csv-file [project-prefix]\n" (car args)
+
+define args : program-arguments
+
+when : null? : cdr args
+     help args
+     exit 1
+
+define csv-file
+    car : cdr args
+
+define project-prefix
+    if : null? : cdr : cdr args
+       . "guile"
+       car : cdr : cdr args
+
+let*
+  : port : open-input-file csv-file
+    data-by-project : read-csv port
+    data-min-by-test : min-alist-by-test data-by-project
+    guile-data : select-project-data data-by-project project-prefix
+  display "=== Best times ==="
+  newline
+  pretty-print : sort data-min-by-test (λ (x y) (string<? (car x) (car y)))
+  newline
+  format #t "=== ~a times ===\n" : string-locale-titlecase project-prefix
+  newline
+  pretty-print : sort guile-data (λ (x y) (string<? (car x) (car y)))
+  newline
+  format #t "=== ~a slowdown ===\n" : string-locale-titlecase project-prefix
+  newline
+  pretty-print : get-multiples guile-data data-min-by-test
+  newline
+  format #t "=== ~a Geometric Mean slowdown ===\n" : string-locale-titlecase project-prefix
+  newline
+  pretty-print
+     expt
+        apply * : get-multiples guile-data data-min-by-test
+        / 1 : length : get-multiples guile-data data-min-by-test
+  newline