Add csv library

Makefile

@@ -19,7 +19,7 @@ endif
 
 all: build
 
-build: retropikzel/${LIBRARY}/LICENSE retropikzel/${LIBRARY}/VERSION
+build: retropikzel/${LIBRARY}/LICENSE retropikzel/${LIBRARY}/VERSION retropikzel/${LIBRARY}/README.md
 	echo "<pre>$$(cat retropikzel/${LIBRARY}/README.md)</pre>" > ${README}
 	snow-chibi package --version=${VERSION} --authors=${AUTHOR} --doc=${README} --description="${DESCRIPTION}" ${LIBRARY_FILE}
 

retropikzel/csv.scm

@@ -0,0 +1,150 @@
+(define string-util-replace-count
+      (lambda (text replace replace-with count)
+        (letrec* ((inner-count 0)
+                  (looper (lambda (result text)
+                            (if (or (string=? replace "")
+                                    (string=? text "")
+                                    (= (string-length text) 0)
+                                    (= inner-count count))
+                              (string-append result text)
+                              (if (and (char=? (string-ref replace 0) (string-ref text 0))
+                                       (>= (string-length text) (string-length replace))
+                                       (string=? (string-copy text 0 (string-length replace))
+                                                 replace))
+                                (begin
+                                  (set! inner-count (+ inner-count 1))
+                                  (looper (string-append result replace-with)
+                                          (string-copy text (string-length replace))))
+                                (looper (string-append result (string-copy text 0 1))
+                                        (string-copy text 1)))))))
+          (looper "" text))))
+
+(define string-util-contains?
+      (lambda (haystack needle)
+        (if (string=? needle "")
+          #f
+          (if (string=? haystack
+                        (string-util-replace-count haystack
+                                                   needle
+                                                   ""
+                                                   1))
+            #f
+            #t))))
+
+(define string-util-replace-all
+      (lambda (text replace replace-with)
+        (letrec ((looper (lambda (result text)
+                           (if (or (string=? replace "")
+                                   (string=? text "")
+                                   (= (string-length text) 0))
+                             result
+                             (if (and (char=? (string-ref replace 0) (string-ref text 0))
+                                      (>= (string-length text) (string-length replace))
+                                      (string=? (string-copy text 0 (string-length replace))
+                                                replace))
+                               (looper (string-append result replace-with)
+                                       (string-copy text (string-length replace)))
+                               (looper (string-append result (string-copy text 0 1))
+                                       (string-copy text 1)))))))
+          (looper "" text))))
+
+(define read-until-char
+      (lambda (result port char)
+        (let ((c (read-char port)))
+          (cond
+            ((or (eof-object? c)
+                 (eof-object? (peek-char port)))
+             (list->string (reverse result)))
+            ((and (not (char=? char #\"))
+                  (char=? c #\return)
+                  (char=? (peek-char port) #\newline))
+             (list->string (reverse result)))
+            ((and (not (char=? char #\"))
+                  (char=? (peek-char port) #\newline))
+             (list->string (reverse (cons c result))))
+            (else
+              ; When reading inside " read "" as "
+              (if (and (char=? char #\")
+                       (char=? c #\")
+                       (char=? (peek-char port) #\"))
+                (read-until-char (cons (read-char port) result) port char)
+                (if (char=? c char)
+                  (list->string (reverse result))
+                  (read-until-char (cons c result) port char))))))))
+1
+(define csv->list ;-> obj
+  #|
+  Reads csv from given port and transforms it into list of list.
+
+  Each row is a list inside list of rows.
+  |#
+  (lambda (delimiter port)
+    (csv->list-loop (list) (list) delimiter port)))
+
+(define csv->list-loop
+  (lambda (result line-list delimiter port)
+    (let* ((next-char (peek-char port)))
+      (if (eof-object? next-char)
+        (reverse result)
+        (csv->list-loop
+          (if (char=? next-char #\newline)
+            (begin
+              (read-char port)
+              (set! result (cons (reverse line-list) result))
+              (set! line-list (list))
+              result)
+            result)
+          (cond
+            ((char=? next-char #\return)
+             (read-char port)
+             line-list)
+            ((char=? next-char delimiter)
+             (read-char port)
+             line-list)
+            ((char=? next-char #\")
+             (read-char port)
+             (cons (read-until-char (list) port #\") line-list))
+            (else (cons (read-until-char (list) port delimiter) line-list)))
+          delimiter port)))))
+
+(define (csv-from-list delimiter rows) ;-> string
+  #| Transform list of lists into CSV string |#
+  (let ((item-display
+          (lambda (item)
+            (let ((write? #f))
+              (when (and (string? item)
+                         (string-util-contains? item (string delimiter)))
+                (set! write? #t))
+              (when (and (string? item)
+                         (string-util-contains? item "\""))
+                (set! item (string-util-replace-all item "\"" "\"\""))
+                (set! write? #t))
+              (when (and (string? item)
+                         (= (string-length item) 0))
+                (set! write? #t))
+              (if write?
+                (write item)
+                (display item))))))
+    (parameterize
+      ((current-output-port
+         (open-output-string)))
+      (for-each
+        (lambda (row)
+          (let ((index -1))
+            (for-each
+              (lambda (item)
+                (set! index (+ index 1))
+                (cond ((= index 0) (item-display item))
+                      (else (display ",")
+                            (item-display item))))
+              row))
+          (newline))
+        rows)
+      (get-output-string (current-output-port)))))
+
+(define csv-file->list
+  (lambda (character file-path)
+    (call-with-input-file
+      file-path
+      (lambda (csv-file-input-port)
+        (csv->list character csv-file-input-port)))))

retropikzel/csv.sld

@@ -0,0 +1,10 @@
+(define-library
+  (retropikzel csv)
+  (import
+    (scheme base)
+    (scheme read)
+    (scheme char)
+    (scheme write)
+    (scheme file))
+  (export csv->list csv-from-list csv-file->list)
+  (include "csv.scm"))

retropikzel/csv/LICENSE

@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
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retropikzel/csv/README.html

@@ -0,0 +1 @@
+<pre>CSV library for R7RS Schemes.</pre>

retropikzel/csv/README.md

@@ -0,0 +1,2 @@
+CSV library for R7RS Schemes.
+

retropikzel/csv/VERSION

@@ -0,0 +1 @@
+1.0.0