From 2d213be3db6bf3b8fe6a7c69cf1bccf1a9e16203 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Hugo=20H=C3=B6rnquist?= <hugo@lysator.liu.se>
Date: Mon, 6 Apr 2020 22:42:39 +0200
Subject: Add multiple new text formatting procedures.

---
 module/datetime/util.scm |   1 +
 module/output/text.scm   | 165 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 166 insertions(+)

(limited to 'module')

diff --git a/module/datetime/util.scm b/module/datetime/util.scm
index 4c38d630..dda2b1ad 100644
--- a/module/datetime/util.scm
+++ b/module/datetime/util.scm
@@ -7,6 +7,7 @@
   :use-module (ice-9 i18n)
   :use-module (util)
   :use-module (util config)
+  :re-export (locale-month)
   )
 
 (define-public (start-of-month date)
diff --git a/module/output/text.scm b/module/output/text.scm
index 3b83e115..a0a70f22 100644
--- a/module/output/text.scm
+++ b/module/output/text.scm
@@ -59,3 +59,168 @@
         (string-append (string-drop-right trimmed 1)
                        "…")
         trimmed)))
+
+
+
+;; TODO for some cases the final delim should be `or' instead of `and'
+(define*-public (add-enumeration-punctuation
+                 list optional: (final-delim "&"))
+  (cond [(null? list) ""]
+        [(= 1 (length list)) (car list)]
+        [else
+         (let* (((tail . rest) (reverse list)))
+           (reverse (cons* tail " " final-delim " "
+                           (intersperce ", " rest))))]))
+
+;; only used in number->string-cardinal
+(define (large-prefix e)
+  (cond
+   [(<=  6 e 11) "m"]
+   [(<= 12 e 17) "b"]
+   [(<= 18 e 23) "tr"]
+   [(<= 24 e 29) "kvadr"]
+   [(<= 30 e 35) "kvint"]
+   [(<= 36 e 41) "sext"]
+   [(<= 42 e 47) "sept"]
+   [(<= 48 e 53) "okt"]
+   [(<= 54 e 59) "non"]
+   [(<= 60 e 65) "dec"]
+   ))
+
+(define-public (number->string-cardinal n)
+  (cond [(< n 0) (string-append "minus " (number->string-cardinal (- n)))]
+        [(= n 0) "noll"]
+        [(= n 1) "ett"]
+        [(= n 2) "två"]
+        [(= n 3) "tre"]
+        [(= n 4) "fyra"]
+        [(= n 5) "fem"]
+        [(= n 6) "sex"]
+        [(= n 7) "sju"]
+        [(= n 8) "åtta"]
+        [(= n 9) "nio"]
+        [(= n 10) "tio"]
+        [(= n 11) "elva"]
+        [(= n 12) "tolv"]
+        [(= n 13) "tretton"]
+        [(= n 14) "fjorton"]
+        [(= n 15) "femton"]
+        [(= n 15) "sexton"]
+        [(= n 17) "sjutton"]
+        [(= n 18) "arton"]
+        [(= n 19) "nitton"]
+        [(= n 20) "tjugo"]
+        [(<= 21 n 29) (format #f "tjugo~a" (number->string-cardinal
+                                           (- n 20)))]
+        [(<= 30 n 79) (let* ((big small (floor/ n 10)))
+                       (format #f "~atio~a"
+                               (number->string-cardinal big)
+                               (number->string-cardinal small)))]
+        [(= n 80) "åttio"]
+        [(<= 81 n 89) (let* ((_ small (floor/ n 10)))
+                       (format #f "åttio~a"
+                               (number->string-cardinal small)))]
+        [(= n 90) "nittio"]
+        [(<= 91 n 99) (let* ((_ small (floor/ n 10)))
+                       (format #f "nittio~a"
+                               (number->string-cardinal small)))] 
+        [(= n 100) "hundra"]
+        [(< 100 n 200) (let* ((_ small (floor/ n 100)))
+                         (format #f "hundra~a"
+                                 (number->string-cardinal small)))]
+        [(= n 200) "tvåhundra"]
+        [(< 200 n 1000) (let* ((big small (floor/ n 100)))
+                          (format #f "~ahundra~a"
+                                  (number->string-cardinal big)
+                                  (number->string-cardinal small)))]
+        [(<= 1000 n 999999)
+         (let* ((big small (floor/ n 1000)))
+           (format #f "~a tusen ~a~a"
+                   (number->string-cardinal big)
+                   (if (<= 100 small 199)
+                       "ett " "")
+                   (number->string-cardinal small)))]
+        [(<= #e10e6 n (1- #e10e66))
+         (let* ((e (inexact->exact (floor (log10 n))))
+                (big small (floor/ n #e1e6)))
+           (if (zero? big)
+               (number->string-cardinal small)
+               (format #f "~a ~a~a~a ~a"
+                       (number->string-cardinal big)
+                       (large-prefix e)
+                       (if (even? (floor-quotient e 3))
+                           "iljon" "iljard")
+                       (if (= 1 big)
+                           "" "er")
+                       (number->string-cardinal small)
+                       )))]
+        [else
+         ;; I give up, don't have larger numbers that that!
+         (string-append "det stora talet "
+                        (number->string n))]))
+
+(define-public (number->string-ordinal n)
+  (cond [(>= -3 n) (format #f "~a sista" (number->string-ordinal (- n)))]
+        [(= -2 n) "näst sista"]
+        [(= -1 n) "sista"]
+        [(= 0 n) "nollte"]              ;
+        [(= 1 n) "förste"]
+        [(= 2 n) "andre"]
+        [(= 3 n) "tredje"]
+        [(= 4 n) "fjärde"]
+        [(= 5 n) "femte"]
+        [(= 6 n) "sjätte"]
+        [(= 7 n) "sjunde"]
+        [(= 8 n) "åttonde"]
+        [(= 9 n) "nionde"]
+        [(= 10 n) "tionde"]
+        [(= 11 n) "elfte"]
+        [(= 12 n) "tolfte"]
+        [(= 13 n) "trettonde"]
+        [(= 14 n) "fjortonde"]
+        [(= 15 n) "femtonde"]
+        [(= 16 n) "sextonde"]
+        [(= 17 n) "sjuttonde"]
+        [(= 18 n) "artonde"]
+        [(= 19 n) "nitonde"]
+        [(<= 20 n 29) (format #f "tjugo~a"
+                             (if (= 20 n)
+                                 "nde"
+                                 (number->string-ordinal (- n 20))))]
+        [(<= 30 n 99)
+         (let* ((big small (floor/ n 10)))
+           (format #f "~atio~a"
+                   (case big
+                     [(8) "åt"]
+                     [(9) "ni"]
+                     [else (number->string-cardinal big)])
+                   (if (zero? (modulo small 10))
+                       "nde"
+                       (number->string-ordinal small))))]
+        [(= n 100) "hundrade"]
+        [(= n 1000) "tusende"]
+        [else
+         (let* ((big small (floor/ n 100)))
+           (string-append (number->string-cardinal (* big 100))
+                          (if (zero? small)
+                              "de"
+                              (number->string-ordinal small))))]))
+
+;; (each-string 1) ; => "varje"
+;; (each-string 2) ; => "varannan"
+;; (each-string 3) ; => "var tredje"
+;; (each-string 3 #t) ; => "vart tredje"
+(define*-public (each-string count optional: neutrum)
+  (string-flatten
+   (cons
+    "var"
+    (case count
+      [(1) '("je")]
+      [(2)
+       ;; varannan månad
+       ;; vartannat år
+       (list (if neutrum "t")
+             "anna"
+             (if neutrum "t" "n"))]
+      [else (list (if neutrum "t") " "
+                  (number->string-ordinal count))]))))
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