veda-run-ilx - Run a SKILL/SKILL++ script from the command-line
veda run-ilx script [script-arg]...
veda-run-ilx script [script-arg]...
Runs a SKILL/SKILL++ script in skill, dbAccess, virtuoso -nograph or virtuoso, depending on its requirements.
Scripts are ordinary SKILL files, preceded by a specially-formatted comment header, e.g.:
#!/usr/bin/env veda-run-ilx
# @language skill
# @requires testing
printf("Hello, World!\n")In the above,
Line 1 is a normal, UNIX-style hashbang line;
Line 2 specifies that the script contains SKILL code. Use @language scheme to trigger SKILL++ evaluation;
Line 3 causes the testing package (and its dependencies, if any) to be loaded prior to the execution of the code. Use a comma-separated list for multiple packages, e.g. @requires foo, bar, baz;
Line 4, as well as any line not starting with #, is passed verbatim to the chosen interpreter.
In addition to the installed Veda packages, a number of implementation pseudo-packages are recognized, and cause the selection of an interpreter with the required features. E.g., @requires db triggers evaluation in dbAccess, which is the "minimal" interpreter exposing the Cadence db* API. Here is the list of recognized pseudo-packages and their corresponding minimal interpreter:
hi: virtuoso;sch: virtuoso -nograph;virtuoso: virtuoso -nograph;db: dbAccess;dd: dbAccess;tech: dbAccess;cdf: dbAccess;ipc: dbAccess.The default interpreter, chosen in the absence of a request for any implementation package, is the skill command.
The run-ilx command defines one globally available, no-arguments function, VedaRunScriptArgs, which can be used to query the [script-arg]... passed on the command-line:
(VedaRunScriptArgs)cf. EXAMPLES section below.
Given the hello.ilx file:
#!/usr/bin/env veda-run-ilx
# @language scheme
;; Defining a "main" function is considered good style.
(defun Hello (args)
(let ((who (if args
(buildString args ", ")
"World")))
(printf "Hello, %s!\n" who)))
;; Go.
(Hello (VedaRunScriptArgs))one can do:
$ chmod 755 hello.ilx
$ ./hello.ilx
Hello, World!
$ ./hello.ilx Roger
Hello, Roger!
$ ./hello.ilx Roger Muscadet
Hello, Roger, Muscadet!