kc3-lang/linenoise/example.c

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• Hash : 622c777f
  Author :
  Date : 2023-03-26T16:42:22
  

  Multiplexing: implement example using it.

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• example.c

• #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <sys/select.h>
  #include "linenoise.h"
  
  void completion(const char *buf, linenoiseCompletions *lc) {
      if (buf[0] == 'h') {
          linenoiseAddCompletion(lc,"hello");
          linenoiseAddCompletion(lc,"hello there");
      }
  }
  
  char *hints(const char *buf, int *color, int *bold) {
      if (!strcasecmp(buf,"hello")) {
          *color = 35;
          *bold = 0;
          return " World";
      }
      return NULL;
  }
  
  int main(int argc, char **argv) {
      char *line;
      char *prgname = argv[0];
      int async = 0;
  
      /* Parse options, with --multiline we enable multi line editing. */
      while(argc > 1) {
          argc--;
          argv++;
          if (!strcmp(*argv,"--multiline")) {
              linenoiseSetMultiLine(1);
              printf("Multi-line mode enabled.\n");
          } else if (!strcmp(*argv,"--keycodes")) {
              linenoisePrintKeyCodes();
              exit(0);
          } else if (!strcmp(*argv,"--async")) {
              async = 1;
          } else {
              fprintf(stderr, "Usage: %s [--multiline] [--keycodes] [--async]\n", prgname);
              exit(1);
          }
      }
  
      /* Set the completion callback. This will be called every time the
       * user uses the <tab> key. */
      linenoiseSetCompletionCallback(completion);
      linenoiseSetHintsCallback(hints);
  
      /* Load history from file. The history file is just a plain text file
       * where entries are separated by newlines. */
      linenoiseHistoryLoad("history.txt"); /* Load the history at startup */
  
      /* Now this is the main loop of the typical linenoise-based application.
       * The call to linenoise() will block as long as the user types something
       * and presses enter.
       *
       * The typed string is returned as a malloc() allocated string by
       * linenoise, so the user needs to free() it. */
  
      while(1) {
          if (!async) {
              line = linenoise("hello> ");
              if (line == NULL) break;
          } else {
              /* Asynchronous mode using the multiplexing API: wait for
               * data on stdin, and simulate async data coming from some source
               * using the select(2) timeout. */
              struct linenoiseState ls;
              char buf[1024];
              char *async_retval;
              int async_len = 0;
              linenoiseEditStart(&ls,-1,-1,buf,sizeof(buf),"hello> ");
              while(1) {
  		fd_set readfds;
  		struct timeval tv;
  		int retval;
  
  		FD_ZERO(&readfds);
  		FD_SET(ls.ifd, &readfds);
  		tv.tv_sec = 1; // 1 sec timeout
  		tv.tv_usec = 0;
  
  		retval = select(ls.ifd+1, &readfds, NULL, NULL, &tv);
  		if (retval == -1) {
  		    perror("select()");
                      exit(1);
  		} else if (retval) {
  		    async_retval = linenoiseEditFeed(&ls,&async_len);
                      /* A NULL return means: line editing is continuing.
                       * Otherwise the user hit enter or stopped editing
                       * (CTRL+C/D). */
                      if (async_retval != NULL) break;
  		} else {
  		    // Timeout occurred
                      static int counter = 0;
                      linenoiseHide(&ls);
  		    printf("Async output %d.\n", counter++);
                      linenoiseShow(&ls);
  		}
              }
              linenoiseEditStop(&ls);
              if (async_len == -1) exit(0); /* Ctrl+D/C. */
              line = strdup(async_retval);
          }
  
          /* Do something with the string. */
          if (line[0] != '\0' && line[0] != '/') {
              printf("echo: '%s'\n", line);
              linenoiseHistoryAdd(line); /* Add to the history. */
              linenoiseHistorySave("history.txt"); /* Save the history on disk. */
          } else if (!strncmp(line,"/historylen",11)) {
              /* The "/historylen" command will change the history len. */
              int len = atoi(line+11);
              linenoiseHistorySetMaxLen(len);
          } else if (!strncmp(line, "/mask", 5)) {
              linenoiseMaskModeEnable();
          } else if (!strncmp(line, "/unmask", 7)) {
              linenoiseMaskModeDisable();
          } else if (line[0] == '/') {
              printf("Unreconized command: %s\n", line);
          }
          free(line);
      }
      return 0;
  }
  

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