Return the given EVALUATION performed by the CI server at URL.

Return a channel inheriting from CHAN but which commit field is set to the latest commit with available substitutes for the Guix package definitions at URL. The current system is taken into account.

If no commit with available substitutes were found, the commit field is set to false and a warning message is printed.

Look up build ID at URL and return it. Raise &http-get-error if it is not found (404).

Return the evaluations among the latest LIMIT evaluations that have COMMIT as one of their inputs.

Return true if PORT is a terminal that supports hyperlink escapes.

Return a procedure that, given a string, colorizes according to RULES. RULES must be a list of regexp/color pairs; the whole match of a regexp is colorized with the corresponding color.

Return TEXT with escapes for a hyperlink to FILE.

Return a copy of STR colorized using ANSI escape sequences according to COLOR. At the end of the returned string, the color attributes are reset such that subsequent output will not have any colors in effect.

Return true if we should write colored output to PORT.