boernel/lilypond-common-includes
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workaround popen trouble on windows

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This commit is contained in:
Christoph Wagner 2025-03-26 16:15:17 +01:00
parent 7d01bd769c
commit 900f4e1d06
1 changed files with 21 additions and 8 deletions
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29
scm/yaml_parser.scm
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@ -1,12 +1,25 @@
(use-modules (ice-9 popen) (ice-9 textual-ports) (json parser))
(if (not windows?) (use-modules (ice-9 popen)))
(use-modules (ice-9 textual-ports) (json parser))
; We use Python to convert the data yamls like the authors.yml to json, that we can parse in scheme.
; Windows does not like Pipes, so we use a tmpfile instead.
; Be sure you have PyYAML installed. On Windows that could be done for example like "py -m pip install PyYAML"
(define (yml-file->scm filename)
(let* ((python_cmd (string-append "import sys, yaml, json; print(json.dumps(yaml.safe_load(open('" filename "'))))"))
; WTF? On Windows there is "py" and we need to specify the encoding, on linux there is "python3" or "python"
; but "python3" seems to work better. Be sure you have PyYAML installed.
(pipe (open-pipe (string-append "PYTHONHOME='' " (if windows? "py" "python3") " -X utf8 -c \"" python_cmd "\"") OPEN_READ))
(json (get-string-all pipe)))
(close-pipe pipe)
(json-string->scm json)))
(if windows?
(let* ((port (make-tmpfile #f))
(tmpfilepath (port-filename port))
(ignore (close-port port))
(python_code (string-append "import sys, yaml, json; f = open(r'" tmpfilepath "', 'w'); f.write(json.dumps(yaml.safe_load(open(r'" filename "')))); f.close()"))
(status (system (string-append (search-executable '("python3" "python" "py")) " -X utf8 -c \"" python_code "\"")))
(readport (open-file tmpfilepath "r" #:encoding "UTF-8"))
(json (get-string-all readport)))
(close-port readport)
(delete-file tmpfilepath)
(json-string->scm (if (status:exit-val status) json "{}")))
(let* ((python_code (string-append "import sys, yaml, json; print(json.dumps(yaml.safe_load(open(r'" filename "'))))"))
(pipe (open-pipe (string-append "PYTHONHOME='' " (search-executable '("python3" "python" "py")) " -X utf8 -c \"" python_code "\"") OPEN_READ))
(json (get-string-all pipe)))
(close-pipe pipe)
(json-string->scm json))))
(define (parse-yml-file filename) (resolve-inherits (yml-file->scm filename)))