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(define-module (terminal util)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-60)
#:use-module (util)
#:use-module (ice-9 popen)
#:export (line ctrl color-escape))
(define* (line #:optional (width 64))
(display (make-string width #\_))
(newline))
(define (ctrl char)
(integer->char (bitwise-and #b00011111 (char->integer char))))
(define-public (display-calendar-header! date)
(let* ((day (number->string (date-day date)))
(month (number->string (date-month date)))
(year (number->string (date-year date))))
;; BSD cal only supports setting highlighted day explicitly for
;; testing the functionality. This seems to at least give me
;; an (almost) working display, albeit ugly.
(if (file-exists? "/usr/bin/ncal")
(system* "ncal" "-3" "-H" (format #f "~a-~a-~a"
year month day)
month year)
(system* "cal" "-3" day month year))))
(define (color-escape n)
(cond ((not n) "")
((char=? #\# (string-ref n 0))
(let* ((str (string-drop n 1))
(rs (substring str 0 2))
(gs (substring str 2 4))
(bs (substring str 4 6)))
(format #f "\x1b[38;2;~a;~a;~am"
(string->number rs 16)
(string->number gs 16)
(string->number bs 16))))))
(define-public (get-terminal-size)
(let* (((rpipe . wpipe) (pipe)))
(system (format #f "stty size > /proc/~s/fd/~s"
(getpid) (port->fdes wpipe)))
(values (read rpipe)
(read rpipe))))
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