From f926a676ef06c7bc14d73a8414be32c27b663473 Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Mon, 14 Mar 2022 07:20:20 -0300
Subject: mv src/curth0.scm src/lib/

---
 src/curth0.scm     | 471 -----------------------------------------------------
 src/lib/curth0.scm | 471 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 471 insertions(+), 471 deletions(-)
 delete mode 100644 src/curth0.scm
 create mode 100644 src/lib/curth0.scm

(limited to 'src')

diff --git a/src/curth0.scm b/src/curth0.scm
deleted file mode 100644
index c56263f..0000000
--- a/src/curth0.scm
+++ /dev/null
@@ -1,471 +0,0 @@
-(define-module (curth0)
-  #:use-module ((language tree-il) #:prefix tree-il:)
-  #:use-module ((ice-9 pretty-print) #:prefix pp:)
-  #:use-module ((srfi srfi-1) #:prefix s1:)
-  #:use-module ((srfi srfi-64) #:prefix t:)
-  #:export (->
-            ->>))
-
-(define (tap x)
-  (pp:pretty-print x)
-  x)
-
-(define-syntax ->
-  (syntax-rules ()
-    ((_) #f)
-    ((_ x) x)
-    ((_ x (f . (head ...))) (f x head ...))
-    ((_ x f) (f x))
-    ((_ x (f . (head ...)) rest ...) (-> (f x head ...) rest ...))
-    ((_ x f rest ...) (-> (f x) rest ...))))
-
-(define-syntax ->>
-  (syntax-rules ()
-    ((_) #f)
-    ((_ x) x)
-    ((_ x (f ...)) (f ... x))
-    ((_ x f) (f x))
-    ((_ x (f ...) rest ...) (->> (f ... x) rest ...))
-    ((_ x f rest ...) (->> (f x) rest ...))))
-
-(define (test-thread-macro)
-  (define (expand l)
-    (tree-il:tree-il->scheme (macroexpand l)))
-
-  (t:test-group "-> and ->>"
-    (t:test-equal '#f (expand '(->)))
-    (t:test-equal '#f (expand '(->>)))
-
-    (t:test-equal '1 (expand '(->  1)))
-    (t:test-equal '1 (expand '(->> 1)))
-
-    (t:test-equal '(f 1) (expand '(->  (f 1))))
-    (t:test-equal '(f 1) (expand '(->> (f 1))))
-
-    (t:test-equal '(f 1 2 3) (expand '(->  1 (f 2 3))))
-    (t:test-equal '(f 2 3 1) (expand '(->> 1 (f 2 3))))
-
-    (t:test-equal '(f 1) (expand '(->  1 f)))
-    (t:test-equal '(f 1) (expand '(->> 1 f)))
-
-    (t:test-equal '(f2 (f1 1)) (expand '(->  1 f1 f2)))
-    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 f1 f2)))
-
-    (t:test-equal '(f2 (f1 1)) (expand '(->  1 (f1) f2)))
-    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 (f1) f2)))
-
-    (t:test-equal '(f2 (f1 1)) (expand '(->  1 f1 (f2))))
-    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 f1 (f2))))
-
-    (t:test-equal '(f2 (f1 1)) (expand '(->  1 (f1) (f2))))
-    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 (f1) (f2))))
-
-    (t:test-equal '(f1 1 (f2)) (expand '(->  1 (f1 (f2)))))
-    (t:test-equal '(f1 (f2) 1) (expand '(->> 1 (f1 (f2)))))
-
-    (t:test-equal '(f6 (f5 (f4 (f3 (f1 1 (f2)))) 0 1 2))
-                   (expand '(->  1 (f1 (f2)) f3 (f4) (f5 0 1 2) f6)))
-    (t:test-equal '(f6 (f5 0 1 2 (f4 (f3 (f1 (f2) 1)))))
-                   (expand '(->> 1 (f1 (f2)) f3 (f4) (f5 0 1 2) f6)))))
-
-(define consumable-chars
-  '(#\space #\tab))
-
-(define (extract-single-line-indentation chars)
-  (s1:fold (lambda (curr acc)
-             (let* ((prev (s1:first acc))
-                    (halted? (s1:second acc))
-                    (n (s1:third acc))
-                    (non-blank? (not (member curr consumable-chars)))
-                    (changed? (and (not (null? prev))
-                                   (not (equal? curr prev)))))
-               (cond
-                 (halted?    acc)
-                 (non-blank? (list prev #t n))
-                 (changed?   (list prev #t n))
-                 (#:else     (list curr #f (+ 1 n))))))
-           '(#nil #f 0)
-           chars))
-
-(define (test-extract-single-line-indentation)
-  (t:test-group "extract-single-line-indentation"
-    (t:test-equal '(#nil #f 0)
-                  (extract-single-line-indentation
-                   '()))
-
-    (t:test-equal '(#nil #t 0)
-                  (extract-single-line-indentation
-                   '(#\a #\b #\c)))
-
-    (t:test-equal '(#\space #t 1)
-                  (extract-single-line-indentation
-                   '(#\space #\b #\c)))
-
-    (t:test-equal '(#\space #t 5)
-                  (extract-single-line-indentation
-                   '(#\space #\space #\space #\space #\space #\b #\c)))
-
-    (t:test-equal '(#\space #f 5)
-                  (extract-single-line-indentation
-                   '(#\space #\space #\space #\space #\space)))
-
-    (t:test-equal '(#\space #f 1)
-                  (extract-single-line-indentation
-                   '(#\space)))
-
-    (t:test-equal '(#\tab #t 3)
-                  (extract-single-line-indentation
-                   '(#\tab #\tab #\tab #\b #\c)))
-
-    (t:test-equal '(#\tab #f 3)
-                  (extract-single-line-indentation
-                   '(#\tab #\tab #\tab)))
-
-    (t:test-equal '(#\tab #f 1)
-                  (extract-single-line-indentation
-                   '(#\tab)))
-
-    (t:test-equal '(#\space #t 1)
-                  (extract-single-line-indentation
-                   '(#\space #\tab)))
-
-    (t:test-equal '(#\space #t 2)
-                  (extract-single-line-indentation
-                   '(#\space #\space #\tab #\space)))
-
-    (t:test-equal '(#\tab #t 3)
-                  (extract-single-line-indentation
-                   '(#\tab #\tab #\tab #\space)))
-
-    (t:test-equal '(#\tab #t 3)
-                  (extract-single-line-indentation
-                   '(#\tab #\tab #\tab #\a #\tab)))
-
-    (t:test-equal '(#\tab #t 3)
-                  (extract-single-line-indentation
-                   '(#\tab #\tab #\tab #\a #\space)))))
-
-(define (extract-line-indentations lines)
-  (map (compose (lambda (triple)
-                  (list (s1:first triple)
-                        (s1:third triple)))
-                extract-single-line-indentation
-                string->list)
-       lines))
-
-(define (test-extract-line-indentations)
-  (t:test-group "extract-line-indentations"
-    (t:test-equal '()
-                  (extract-line-indentations
-                   '()))
-
-    (t:test-equal '((#nil 0))
-                  (extract-line-indentations
-                   '("")))
-
-    (t:test-equal '((#nil 0) (#nil 0) (#nil 0))
-                  (extract-line-indentations
-                   '("" "" "")))
-
-    (t:test-equal '((#nil 0) (#nil 0) (#nil 0))
-                  (extract-line-indentations
-                   '("a" "b" "c")))
-
-    (t:test-equal '((#\space 1) (#\space 2) (#\space 3))
-                  (extract-line-indentations
-                   '(" " "  " "   ")))
-
-    (t:test-equal '((#\space 1) (#\tab 1) (#\space 3))
-                  (extract-line-indentations
-                   '(" " "	" "   ")))
-
-    (t:test-equal '((#nil 0) (#\space 3) (#\tab 2))
-                  (extract-line-indentations
-                   '("no spaces" "   with spaces" "		with tabs")))))
-
-(define (maximum-indentation lines)
-  (let* ((line-indentations (extract-line-indentations lines))
-         (chars (map s1:first line-indentations))
-         (different-indents? (not (= 1 (length (s1:delete-duplicates chars))))))
-    (if different-indents?
-      0
-      (apply min (map s1:second line-indentations)))))
-
-(define (test-maximum-indentation)
-  (t:test-group "maximum-indentation"
-    (t:test-equal 0
-                  (maximum-indentation
-                   '()))
-
-    (t:test-equal 0
-                  (maximum-indentation
-                   '("")))
-
-    (t:test-equal 0
-                  (maximum-indentation
-                   '("" "" "")))
-
-    (t:test-equal 0
-                  (maximum-indentation
-                   '("" " " "")))
-
-    (t:test-equal 1
-                  (maximum-indentation
-                   '(" " " " " ")))
-
-    (t:test-equal 2
-                  (maximum-indentation
-                   '("    a" "   b" "  c")))
-
-    (t:test-equal 1
-                  (maximum-indentation
-                   '("  space space" " 	space tab" "  	space space tab")))
-
-    (t:test-equal 0
-                  (maximum-indentation
-                   '("  space space" " 	space tab" "none")))))
-
-(define (trim-indentation s)
-  (let* ((lines (string-split s #\newline))
-         (trim-n (maximum-indentation
-                  (filter (lambda (s) (not (equal? "" s)))
-                          lines))))
-    (string-join
-     (map (lambda (line)
-            (if (equal? "" line)
-              line
-              (substring line trim-n)))
-          lines)
-     "\n")))
-
-(define (test-trim-indentation)
-  (t:test-group "trim-indentation"
-    (t:test-equal ""
-                  (trim-indentation ""))
-
-    (t:test-equal "alltogether"
-                  (trim-indentation "alltogether"))
-
-    (t:test-equal "with spaces between"
-                  (trim-indentation "with spaces between"))
-
-    (t:test-equal "with spaces around "
-                  (trim-indentation " with spaces around "))
-
-    (t:test-equal "with  multiple  spaces  "
-                  (trim-indentation "  with  multiple  spaces  "))
-
-    (t:test-equal "tabs	"
-                  (trim-indentation "		tabs	"))
-
-    (t:test-equal "tabs and spaces "
-                  (trim-indentation "		tabs and spaces "))
-
-    (t:test-equal "\n"
-                  (trim-indentation "\n"))
-
-    (t:test-equal "\n\n\nmultiple empty lines\n\n\n"
-                  (trim-indentation "\n\n\nmultiple empty lines\n\n\n"))
-
-    (t:test-equal "\n\nmixed\n indentations\n"
-                  (trim-indentation "\n\nmixed\n indentations\n"))
-
-    (t:test-equal "\n\n\n \n  lines with only spaces\n"
-                  (trim-indentation "\n\n  \n   \n    lines with only spaces\n"))
-
-    (t:test-equal "\n\n    mixed spaces\n	and tabs"
-                  (trim-indentation "\n\n    mixed spaces\n	and tabs"))
-
-    (t:test-equal "\nstripped\n  tabs"
-                  (trim-indentation "\n	stripped\n	  tabs"))
-
-    (t:test-equal "
-#!/bin/sh
-set -eu
-
-ret=0
-if cmd; then
-	echo 'Done!'
-	ret=1
-fi
-exit $ret
-"
-                  (trim-indentation "
-	#!/bin/sh
-	set -eu
-
-	ret=0
-	if cmd; then
-		echo 'Done!'
-		ret=1
-	fi
-	exit $ret
-"))))
-
-
-(define (non-quote-chars? chars)
-  (let ((non-quote-chars (filter (lambda (c)
-                                   (not (equal? #\" c)))
-                                 chars)))
-    (< 0 (length non-quote-chars))))
-
-(define (test-non-quote-chars?)
-  (t:test-group "non-quote-chars?"
-    (t:test-equal #f
-                  (non-quote-chars?
-                   '()))
-
-    (t:test-equal #f
-                  (non-quote-chars?
-                   '(#\")))
-
-    (t:test-equal #f
-                  (non-quote-chars?
-                   '(#\" #\" #\")))
-
-    (t:test-equal #t
-                  (non-quote-chars?
-                   '(#\" #\" #\-)))
-
-    (t:test-equal #t
-                  (non-quote-chars?
-                   '(#\a #\")))))
-
-(define (multiline-string-reader _char port)
-  (let ((multiline? #f)
-        (chars '()))
-    (do ((curr (read-char port)
-               (read-char port)))
-        ((equal? #\newline curr))
-      (set! chars (cons curr chars)))
-    (when (and (not (null? chars))
-               (equal? #\- (car chars)))
-      (set! multiline? #t)
-      (set! chars (cdr chars)))
-    (let ((non-quote-chars (non-quote-chars? chars)))
-      (when non-quote-chars
-        (error
-         (format
-          #f
-          "Invalid characters at the beginning of the multiline reader: ~s"
-          (reverse non-quote-chars)))))
-    (let* ((quote-count (+ 1 (length chars)))
-           (quote-n 0)
-           (output '()))
-      (while #t
-        (let ((curr (read-char port)))
-          (when (eof-object? curr)
-            (error "EOF while reading #\"\"# multiline string"))
-          (set! output (cons curr output))
-          (set! quote-n
-                (cond
-                  ((and (>= quote-n quote-count)
-                        (equal? #\# curr))
-                   (break))
-                  ((equal? #\" curr) (+ 1 quote-n))
-                  (#:else 0)))))
-      (let ((s (list->string
-                (reverse
-                 (s1:drop output (+ 1 quote-count))))))
-        (if multiline?
-          (trim-indentation s)
-          s)))))
-
-(read-hash-extend #\" multiline-string-reader)
-
-(define (test-multiline-string-reader)
-  (t:test-group "multiline-string-reader"
-    (t:test-equal ""
-                  #""
-""#)
-
-    (t:test-equal "  "
-                  #""
-  ""#)
-
-    (t:test-equal "                    "
-                  #""
-                    ""#)
-
-    (t:test-equal ""
-                  #""-
-                    ""#)
-
-    (t:test-equal "                    some\n                    text"
-                  #""
-                    some
-                    text""#)
-
-    (t:test-equal "some\ntext"
-                  #""-
-                    some
-                    text""#)
-
-    (t:test-equal "  indented\ntext"
-                  #""-
-                      indented
-                    text""#)
-
-    (t:test-equal "with\nnewline\n"
-                  #""-
-                      with
-                      newline
-                      ""#)
-
-    (t:test-equal "  unindented\n  newline\n"
-                  #""-
-                      unindented
-                      newline
-                    ""#)
-
-    (t:test-equal "multiple quotes: #\"\"\"inside\"\"\"#\n"
-                  #""""-
-                    multiple quotes: #"""inside"""#
-                    """"#)
-
-    (t:test-equal "                    indented"
-                  #"
-                    indented"#)
-
-    (t:test-equal "unindented"
-                  #""-
-                    unindented""#)
-
-    (t:test-equal "#!/bin/sh
-set -eu
-
-some-cmd
-echo \"$SOMETHING\"# here is a valid glued comment
-if cmd; then
-	echo 'Indentation here!'
-	echo \"\"# anothe valid comment, glued to an empty string
-fi
-"
-                  #"""-
-                    #!/bin/sh
-                    set -eu
-
-                    some-cmd
-                    echo "$SOMETHING"# here is a valid glued comment
-                    if cmd; then
-                    	echo 'Indentation here!'
-                    	echo ""# anothe valid comment, glued to an empty string
-                    fi
-                    """#)))
-
-(define test-fns
-  (list
-   test-thread-macro
-   test-extract-single-line-indentation
-   test-extract-line-indentations
-   test-maximum-indentation
-   test-trim-indentation
-   test-non-quote-chars?
-   test-multiline-string-reader))
-
-(define (unit-tests)
-  (t:test-begin "curth0-tests")
-  (for-each (lambda (fn) (fn)) test-fns)
-  (let ((n-fail (t:test-runner-fail-count (t:test-runner-get))))
-    (t:test-end)
-    n-fail))
diff --git a/src/lib/curth0.scm b/src/lib/curth0.scm
new file mode 100644
index 0000000..c56263f
--- /dev/null
+++ b/src/lib/curth0.scm
@@ -0,0 +1,471 @@
+(define-module (curth0)
+  #:use-module ((language tree-il) #:prefix tree-il:)
+  #:use-module ((ice-9 pretty-print) #:prefix pp:)
+  #:use-module ((srfi srfi-1) #:prefix s1:)
+  #:use-module ((srfi srfi-64) #:prefix t:)
+  #:export (->
+            ->>))
+
+(define (tap x)
+  (pp:pretty-print x)
+  x)
+
+(define-syntax ->
+  (syntax-rules ()
+    ((_) #f)
+    ((_ x) x)
+    ((_ x (f . (head ...))) (f x head ...))
+    ((_ x f) (f x))
+    ((_ x (f . (head ...)) rest ...) (-> (f x head ...) rest ...))
+    ((_ x f rest ...) (-> (f x) rest ...))))
+
+(define-syntax ->>
+  (syntax-rules ()
+    ((_) #f)
+    ((_ x) x)
+    ((_ x (f ...)) (f ... x))
+    ((_ x f) (f x))
+    ((_ x (f ...) rest ...) (->> (f ... x) rest ...))
+    ((_ x f rest ...) (->> (f x) rest ...))))
+
+(define (test-thread-macro)
+  (define (expand l)
+    (tree-il:tree-il->scheme (macroexpand l)))
+
+  (t:test-group "-> and ->>"
+    (t:test-equal '#f (expand '(->)))
+    (t:test-equal '#f (expand '(->>)))
+
+    (t:test-equal '1 (expand '(->  1)))
+    (t:test-equal '1 (expand '(->> 1)))
+
+    (t:test-equal '(f 1) (expand '(->  (f 1))))
+    (t:test-equal '(f 1) (expand '(->> (f 1))))
+
+    (t:test-equal '(f 1 2 3) (expand '(->  1 (f 2 3))))
+    (t:test-equal '(f 2 3 1) (expand '(->> 1 (f 2 3))))
+
+    (t:test-equal '(f 1) (expand '(->  1 f)))
+    (t:test-equal '(f 1) (expand '(->> 1 f)))
+
+    (t:test-equal '(f2 (f1 1)) (expand '(->  1 f1 f2)))
+    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 f1 f2)))
+
+    (t:test-equal '(f2 (f1 1)) (expand '(->  1 (f1) f2)))
+    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 (f1) f2)))
+
+    (t:test-equal '(f2 (f1 1)) (expand '(->  1 f1 (f2))))
+    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 f1 (f2))))
+
+    (t:test-equal '(f2 (f1 1)) (expand '(->  1 (f1) (f2))))
+    (t:test-equal '(f2 (f1 1)) (expand '(->> 1 (f1) (f2))))
+
+    (t:test-equal '(f1 1 (f2)) (expand '(->  1 (f1 (f2)))))
+    (t:test-equal '(f1 (f2) 1) (expand '(->> 1 (f1 (f2)))))
+
+    (t:test-equal '(f6 (f5 (f4 (f3 (f1 1 (f2)))) 0 1 2))
+                   (expand '(->  1 (f1 (f2)) f3 (f4) (f5 0 1 2) f6)))
+    (t:test-equal '(f6 (f5 0 1 2 (f4 (f3 (f1 (f2) 1)))))
+                   (expand '(->> 1 (f1 (f2)) f3 (f4) (f5 0 1 2) f6)))))
+
+(define consumable-chars
+  '(#\space #\tab))
+
+(define (extract-single-line-indentation chars)
+  (s1:fold (lambda (curr acc)
+             (let* ((prev (s1:first acc))
+                    (halted? (s1:second acc))
+                    (n (s1:third acc))
+                    (non-blank? (not (member curr consumable-chars)))
+                    (changed? (and (not (null? prev))
+                                   (not (equal? curr prev)))))
+               (cond
+                 (halted?    acc)
+                 (non-blank? (list prev #t n))
+                 (changed?   (list prev #t n))
+                 (#:else     (list curr #f (+ 1 n))))))
+           '(#nil #f 0)
+           chars))
+
+(define (test-extract-single-line-indentation)
+  (t:test-group "extract-single-line-indentation"
+    (t:test-equal '(#nil #f 0)
+                  (extract-single-line-indentation
+                   '()))
+
+    (t:test-equal '(#nil #t 0)
+                  (extract-single-line-indentation
+                   '(#\a #\b #\c)))
+
+    (t:test-equal '(#\space #t 1)
+                  (extract-single-line-indentation
+                   '(#\space #\b #\c)))
+
+    (t:test-equal '(#\space #t 5)
+                  (extract-single-line-indentation
+                   '(#\space #\space #\space #\space #\space #\b #\c)))
+
+    (t:test-equal '(#\space #f 5)
+                  (extract-single-line-indentation
+                   '(#\space #\space #\space #\space #\space)))
+
+    (t:test-equal '(#\space #f 1)
+                  (extract-single-line-indentation
+                   '(#\space)))
+
+    (t:test-equal '(#\tab #t 3)
+                  (extract-single-line-indentation
+                   '(#\tab #\tab #\tab #\b #\c)))
+
+    (t:test-equal '(#\tab #f 3)
+                  (extract-single-line-indentation
+                   '(#\tab #\tab #\tab)))
+
+    (t:test-equal '(#\tab #f 1)
+                  (extract-single-line-indentation
+                   '(#\tab)))
+
+    (t:test-equal '(#\space #t 1)
+                  (extract-single-line-indentation
+                   '(#\space #\tab)))
+
+    (t:test-equal '(#\space #t 2)
+                  (extract-single-line-indentation
+                   '(#\space #\space #\tab #\space)))
+
+    (t:test-equal '(#\tab #t 3)
+                  (extract-single-line-indentation
+                   '(#\tab #\tab #\tab #\space)))
+
+    (t:test-equal '(#\tab #t 3)
+                  (extract-single-line-indentation
+                   '(#\tab #\tab #\tab #\a #\tab)))
+
+    (t:test-equal '(#\tab #t 3)
+                  (extract-single-line-indentation
+                   '(#\tab #\tab #\tab #\a #\space)))))
+
+(define (extract-line-indentations lines)
+  (map (compose (lambda (triple)
+                  (list (s1:first triple)
+                        (s1:third triple)))
+                extract-single-line-indentation
+                string->list)
+       lines))
+
+(define (test-extract-line-indentations)
+  (t:test-group "extract-line-indentations"
+    (t:test-equal '()
+                  (extract-line-indentations
+                   '()))
+
+    (t:test-equal '((#nil 0))
+                  (extract-line-indentations
+                   '("")))
+
+    (t:test-equal '((#nil 0) (#nil 0) (#nil 0))
+                  (extract-line-indentations
+                   '("" "" "")))
+
+    (t:test-equal '((#nil 0) (#nil 0) (#nil 0))
+                  (extract-line-indentations
+                   '("a" "b" "c")))
+
+    (t:test-equal '((#\space 1) (#\space 2) (#\space 3))
+                  (extract-line-indentations
+                   '(" " "  " "   ")))
+
+    (t:test-equal '((#\space 1) (#\tab 1) (#\space 3))
+                  (extract-line-indentations
+                   '(" " "	" "   ")))
+
+    (t:test-equal '((#nil 0) (#\space 3) (#\tab 2))
+                  (extract-line-indentations
+                   '("no spaces" "   with spaces" "		with tabs")))))
+
+(define (maximum-indentation lines)
+  (let* ((line-indentations (extract-line-indentations lines))
+         (chars (map s1:first line-indentations))
+         (different-indents? (not (= 1 (length (s1:delete-duplicates chars))))))
+    (if different-indents?
+      0
+      (apply min (map s1:second line-indentations)))))
+
+(define (test-maximum-indentation)
+  (t:test-group "maximum-indentation"
+    (t:test-equal 0
+                  (maximum-indentation
+                   '()))
+
+    (t:test-equal 0
+                  (maximum-indentation
+                   '("")))
+
+    (t:test-equal 0
+                  (maximum-indentation
+                   '("" "" "")))
+
+    (t:test-equal 0
+                  (maximum-indentation
+                   '("" " " "")))
+
+    (t:test-equal 1
+                  (maximum-indentation
+                   '(" " " " " ")))
+
+    (t:test-equal 2
+                  (maximum-indentation
+                   '("    a" "   b" "  c")))
+
+    (t:test-equal 1
+                  (maximum-indentation
+                   '("  space space" " 	space tab" "  	space space tab")))
+
+    (t:test-equal 0
+                  (maximum-indentation
+                   '("  space space" " 	space tab" "none")))))
+
+(define (trim-indentation s)
+  (let* ((lines (string-split s #\newline))
+         (trim-n (maximum-indentation
+                  (filter (lambda (s) (not (equal? "" s)))
+                          lines))))
+    (string-join
+     (map (lambda (line)
+            (if (equal? "" line)
+              line
+              (substring line trim-n)))
+          lines)
+     "\n")))
+
+(define (test-trim-indentation)
+  (t:test-group "trim-indentation"
+    (t:test-equal ""
+                  (trim-indentation ""))
+
+    (t:test-equal "alltogether"
+                  (trim-indentation "alltogether"))
+
+    (t:test-equal "with spaces between"
+                  (trim-indentation "with spaces between"))
+
+    (t:test-equal "with spaces around "
+                  (trim-indentation " with spaces around "))
+
+    (t:test-equal "with  multiple  spaces  "
+                  (trim-indentation "  with  multiple  spaces  "))
+
+    (t:test-equal "tabs	"
+                  (trim-indentation "		tabs	"))
+
+    (t:test-equal "tabs and spaces "
+                  (trim-indentation "		tabs and spaces "))
+
+    (t:test-equal "\n"
+                  (trim-indentation "\n"))
+
+    (t:test-equal "\n\n\nmultiple empty lines\n\n\n"
+                  (trim-indentation "\n\n\nmultiple empty lines\n\n\n"))
+
+    (t:test-equal "\n\nmixed\n indentations\n"
+                  (trim-indentation "\n\nmixed\n indentations\n"))
+
+    (t:test-equal "\n\n\n \n  lines with only spaces\n"
+                  (trim-indentation "\n\n  \n   \n    lines with only spaces\n"))
+
+    (t:test-equal "\n\n    mixed spaces\n	and tabs"
+                  (trim-indentation "\n\n    mixed spaces\n	and tabs"))
+
+    (t:test-equal "\nstripped\n  tabs"
+                  (trim-indentation "\n	stripped\n	  tabs"))
+
+    (t:test-equal "
+#!/bin/sh
+set -eu
+
+ret=0
+if cmd; then
+	echo 'Done!'
+	ret=1
+fi
+exit $ret
+"
+                  (trim-indentation "
+	#!/bin/sh
+	set -eu
+
+	ret=0
+	if cmd; then
+		echo 'Done!'
+		ret=1
+	fi
+	exit $ret
+"))))
+
+
+(define (non-quote-chars? chars)
+  (let ((non-quote-chars (filter (lambda (c)
+                                   (not (equal? #\" c)))
+                                 chars)))
+    (< 0 (length non-quote-chars))))
+
+(define (test-non-quote-chars?)
+  (t:test-group "non-quote-chars?"
+    (t:test-equal #f
+                  (non-quote-chars?
+                   '()))
+
+    (t:test-equal #f
+                  (non-quote-chars?
+                   '(#\")))
+
+    (t:test-equal #f
+                  (non-quote-chars?
+                   '(#\" #\" #\")))
+
+    (t:test-equal #t
+                  (non-quote-chars?
+                   '(#\" #\" #\-)))
+
+    (t:test-equal #t
+                  (non-quote-chars?
+                   '(#\a #\")))))
+
+(define (multiline-string-reader _char port)
+  (let ((multiline? #f)
+        (chars '()))
+    (do ((curr (read-char port)
+               (read-char port)))
+        ((equal? #\newline curr))
+      (set! chars (cons curr chars)))
+    (when (and (not (null? chars))
+               (equal? #\- (car chars)))
+      (set! multiline? #t)
+      (set! chars (cdr chars)))
+    (let ((non-quote-chars (non-quote-chars? chars)))
+      (when non-quote-chars
+        (error
+         (format
+          #f
+          "Invalid characters at the beginning of the multiline reader: ~s"
+          (reverse non-quote-chars)))))
+    (let* ((quote-count (+ 1 (length chars)))
+           (quote-n 0)
+           (output '()))
+      (while #t
+        (let ((curr (read-char port)))
+          (when (eof-object? curr)
+            (error "EOF while reading #\"\"# multiline string"))
+          (set! output (cons curr output))
+          (set! quote-n
+                (cond
+                  ((and (>= quote-n quote-count)
+                        (equal? #\# curr))
+                   (break))
+                  ((equal? #\" curr) (+ 1 quote-n))
+                  (#:else 0)))))
+      (let ((s (list->string
+                (reverse
+                 (s1:drop output (+ 1 quote-count))))))
+        (if multiline?
+          (trim-indentation s)
+          s)))))
+
+(read-hash-extend #\" multiline-string-reader)
+
+(define (test-multiline-string-reader)
+  (t:test-group "multiline-string-reader"
+    (t:test-equal ""
+                  #""
+""#)
+
+    (t:test-equal "  "
+                  #""
+  ""#)
+
+    (t:test-equal "                    "
+                  #""
+                    ""#)
+
+    (t:test-equal ""
+                  #""-
+                    ""#)
+
+    (t:test-equal "                    some\n                    text"
+                  #""
+                    some
+                    text""#)
+
+    (t:test-equal "some\ntext"
+                  #""-
+                    some
+                    text""#)
+
+    (t:test-equal "  indented\ntext"
+                  #""-
+                      indented
+                    text""#)
+
+    (t:test-equal "with\nnewline\n"
+                  #""-
+                      with
+                      newline
+                      ""#)
+
+    (t:test-equal "  unindented\n  newline\n"
+                  #""-
+                      unindented
+                      newline
+                    ""#)
+
+    (t:test-equal "multiple quotes: #\"\"\"inside\"\"\"#\n"
+                  #""""-
+                    multiple quotes: #"""inside"""#
+                    """"#)
+
+    (t:test-equal "                    indented"
+                  #"
+                    indented"#)
+
+    (t:test-equal "unindented"
+                  #""-
+                    unindented""#)
+
+    (t:test-equal "#!/bin/sh
+set -eu
+
+some-cmd
+echo \"$SOMETHING\"# here is a valid glued comment
+if cmd; then
+	echo 'Indentation here!'
+	echo \"\"# anothe valid comment, glued to an empty string
+fi
+"
+                  #"""-
+                    #!/bin/sh
+                    set -eu
+
+                    some-cmd
+                    echo "$SOMETHING"# here is a valid glued comment
+                    if cmd; then
+                    	echo 'Indentation here!'
+                    	echo ""# anothe valid comment, glued to an empty string
+                    fi
+                    """#)))
+
+(define test-fns
+  (list
+   test-thread-macro
+   test-extract-single-line-indentation
+   test-extract-line-indentations
+   test-maximum-indentation
+   test-trim-indentation
+   test-non-quote-chars?
+   test-multiline-string-reader))
+
+(define (unit-tests)
+  (t:test-begin "curth0-tests")
+  (for-each (lambda (fn) (fn)) test-fns)
+  (let ((n-fail (t:test-runner-fail-count (t:test-runner-get))))
+    (t:test-end)
+    n-fail))
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