dep

Package manager for embedded C libraries
git clone git://git.finwo.net/app/dep
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main.c (2235B)

      1 #include <stdio.h>
      2 #include <stdlib.h>
      3 #include <string.h>
      4 
      5 #include "command/command.h"
      6 #include "common/usage.h"
      7 
      8 static int cmd_help(int argc, const char **argv) {
      9   if (argc < 1) {
     10     dep_print_global_usage();
     11     return 0;
     12   }
     13 
     14   if (argc == 1 && (!strcmp(argv[0], "help") || !strcmp(argv[0], "h") || !strcmp(argv[0], "global"))) {
     15     dep_print_global_usage();
     16     return 0;
     17   }
     18 
     19   const char *topic = (argc > 1) ? argv[1] : argv[0];
     20 
     21   if (!strcmp(topic, "global")) {
     22     dep_print_global_usage();
     23     return 0;
     24   }
     25 
     26   struct cmd_struct *cmd = commands;
     27   while (cmd) {
     28     // Aliases resolve to the same help as the command itself
     29     const char **name = cmd->name;
     30     while (*name) {
     31       if (!strcmp(topic, *name)) {
     32         if (cmd->help_text) {
     33           printf("%s\n", cmd->help_text);
     34         } else {
     35           printf("dep %s - %s\n\n", cmd->name[0], cmd->description);
     36           printf("  %s\n", cmd->display);
     37         }
     38         return 0;
     39       }
     40       name++;
     41     }
     42     cmd = cmd->next;
     43   }
     44 
     45   fprintf(stderr, "Error: no help available for '%s'\n", topic);
     46   fprintf(stderr, "Run 'dep help' for the available commands.\n");
     47   return 1;
     48 }
     49 
     50 void __attribute__((constructor)) cmd_help_setup(void) {
     51   struct cmd_struct *cmd = calloc(1, sizeof(struct cmd_struct));
     52   if (!cmd) {
     53     fprintf(stderr, "Failed to allocate memory for help command\n");
     54     return;
     55   }
     56   cmd->next                       = commands;
     57   cmd->fn                         = cmd_help;
     58   static const char *help_names[] = {"help", "h", NULL};
     59   cmd->name                       = help_names;
     60   cmd->display                    = "help [command]";
     61   cmd->description                = "Show this help or the top-level info about a command";
     62   cmd->help_text =
     63       "dep help - Show this help or the top-level info about a command\n"
     64       "\n"
     65       "Usage:\n"
     66       "  dep help\n"
     67       "  dep help <command>\n"
     68       "\n"
     69       "Description:\n"
     70       "  Show general help or detailed help for a specific command.\n"
     71       "\n"
     72       "Examples:\n"
     73       "  dep help              # Show general help\n"
     74       "  dep help add          # Show help for add command\n"
     75       "  dep help install      # Show help for install command\n";
     76   commands = cmd;
     77 }