first version of system-cmd

Readme.md

@@ -1,6 +1,5 @@
 
 ### TODO
-- construct list for parse-csv in csvparse.cpp instead of ml.cpp
 - support for strings with " included
 - documentation
 - add url of source/inspiration to clib/*.cpp
@@ -10,13 +9,16 @@
 - prejmenovat ivaluize
 - add some debug support??
 - add instrumentation (time, nr of evals, debug info, debug environment etc)
+- in cating functions (as_string..) better exception description
+- add fuctions asecond,third, fourth...
+- add better print (syntaxhighligting)
 
 #### Functionality
 - readline
 - execute system command
 - printf
 - env
-- support for including lib
+- support for including lisp lib
 - date support
 - file functions
   - name it here

debug.lisp

@@ -1,24 +1,57 @@
 (print "Debug starts")
 
-(define json_list (read-json "{\"k1\":\"v1\", \"k2\":42, \"k3\":[\"a\",123,true,false,null]}"))
-(print json_list)
-(for x json_list
-     (print x))
+; define a function `fact` that takes an argument `n`
+; (defun fact (n)
+;   (if (<= n 1)
+;      1
+;      (* n (fact (- n 1)))
+;    ))
 
+; (print (fact 5))
+
+
+; (define json_list (read-json "{\"k1\":\"v1\", \"k2\":42, \"k3\":[\"a\",123,true,false,null]}"))
+; (print json_list)
+; (for x json_list
+;      (print x))
+
+; nefunguje - api.nasdaq.com
+;(define nasdaq_headers (quote (("Accept" "application/json, text/plain, */*") ("Connection" "keep-alive") ("Origin" "https://www.nasdaq.com/") ("User-Agent" "Mozilla/5.0 (Windows NT 10.0)"))))
+;(define json_list2 (read-json (read-url "https://api.nasdaq.com/api/calendar/dividends/?date=2021-02-01" nasdaq_headers)))
+; (for x json_list2
+;      (print x))
 
 ;; (include "tmp/example.lisp")
 ;; (print "sorted: " (qs '(10 9 8 7 6 5 4 3 2 1)))
 
-;; (define csv (read-file "tmp/data.csv"))
-;; ; (print csv)
-;; (define csv_list (parse-csv csv))
-;; ; (print csv_list)
-;; (for x csv_list 
-;;      (print x))
+
+; (define csv (read-file "tmp/data.csv"))
+; (define csv_list (parse-csv csv))
+; (for x csv_list
+;      (print x))
 
 ;; (define web_page (read-url "https://query1.finance.yahoo.com/v7/finance/download/FDX?period1=1581272585&period2=1612894985&interval=1d&events=history&includeAdjustedClose=true"))
 ;; (print web_page)
 ;; (define fdx_list (parse-csv (index web_page 1)))
 ;; (print fdx_list)
 
+
+(define curl "curl -H \"Accept: application/json, text/plain, */*\" -H \"Origin: https://www.nasdaq.com/\" -H \"User-Agent: Mozilla/5.0 (Windows NT 10.0)\" https://api.nasdaq.com/api/calendar/dividends/?date=2021-02-01 2>/dev/null")
+(define curl_out (system-cmd curl))
+(define json_list (read-json (last curl_out)))
+;(print json_list)
+(define data (first json_list))
+;(print data)
+;(print (index data 1))  ; druhy prvek
+(define calendar (index data 1))
+;(print calendar)
+(define calendar_data (index (index calendar 0) 1))
+;(print calendar_data)
+(define header (index (index calendar_data 0) 1))
+;(print header)
+(define rows (index (index calendar_data 1) 1))
+;(print rows)
+(for x rows
+     (print x))
+
 (print "Debug ends")

ml.cpp

@@ -1213,6 +1213,47 @@ namespace builtin {
         return json.ivalualize();
     }
 
+    // Execute system command
+    MlValue system_cmd(std::vector<MlValue> args, MlEnvironment &env) {
+        eval_args(args, env);
+
+        // TODO add support for more params constructing options as one string
+        // TODO add support for stderr
+        if (args.size() != 1)
+            throw MlError(MlValue("system-cmd", system_cmd), env, args.size() > 1 ? TOO_MANY_ARGS : TOO_FEW_ARGS);
+
+        std::string cmd = args[0].as_string();
+
+        std::string cmd_output = "";
+        int stat;
+
+        // TODO better parameter here
+        // TODO handle reading of stderr
+        // https://stackoverflow.com/questions/478898/how-do-i-execute-a-command-and-get-the-output-of-the-command-within-c-using-po
+        // https://jineshkj.wordpress.com/2006/12/22/how-to-capture-stdin-stdout-and-stderr-of-child-program/
+        char buffer[128];
+        FILE *pipe = popen(cmd.c_str(), "r");
+        if (!pipe)
+            throw std::runtime_error("popen() failed!");
+        try {
+            while (!std::feof(pipe)) {
+                if (std::fgets(buffer, 128, pipe) != nullptr)
+                    cmd_output += buffer;
+            }
+        } catch (...) {
+            stat = pclose(pipe);
+            throw;
+        }
+        stat = pclose(pipe);
+        int cmd_retval = WEXITSTATUS(stat);
+
+        // TODO add helper function for this
+        std::vector<MlValue> lst;
+        lst.push_back(MlValue(cmd_retval));
+        lst.push_back(MlValue::string(cmd_output));
+        return lst;
+    }
+
 
     // Read a file and execute its code
     MlValue include(std::vector<MlValue> args, MlEnvironment &env) {
@@ -1738,6 +1779,7 @@ MlValue MlEnvironment::get(const std::string& name) const {
     if (name == "write-file") return MlValue("write-file", builtin::write_file);
     if (name == "read-url") return MlValue("read-url", builtin::read_url);
     if (name == "read-json") return MlValue("read-json", builtin::read_json);
+    if (name == "system-cmd") return MlValue("system-cmd", builtin::system_cmd);
 #endif
 
     // String operations