thodg/libgit2/examples/add.c

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• Hash : ead10785
  Author :
  Date : 2019-01-24T11:31:49
  

  examples: create common lg2 executable Inside of our networking example code, we have a git2 executable that acts as an entry point to all the different network examples. As such, it is kind of the same like the normal git(1) executable in that it simply arbitrates to the respective subcommands. Let's extend this approach and merge all examples into a single standalone lg2 executable. Instead of building an executable for all the existing examples we have, we now bundle them all inside of the lg2 one and let them be callable via subcommands. In the process, we can get rid of duplicated library initialization, deinitialization and repository discovery code. Instead of having each subcommand handle these on its own, we simply do it inside of the single main function now.

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• examples/add.c

• /*
   * libgit2 "add" example - shows how to modify the index
   *
   * Written by the libgit2 contributors
   *
   * To the extent possible under law, the author(s) have dedicated all copyright
   * and related and neighboring rights to this software to the public domain
   * worldwide. This software is distributed without any warranty.
   *
   * You should have received a copy of the CC0 Public Domain Dedication along
   * with this software. If not, see
   * <http://creativecommons.org/publicdomain/zero/1.0/>.
   */
  
  #include "common.h"
  #include <assert.h>
  
  enum print_options {
  	SKIP = 1,
  	VERBOSE = 2,
  	UPDATE = 4,
  };
  
  struct print_payload {
  	enum print_options options;
  	git_repository *repo;
  };
  
  /* Forward declarations for helpers */
  static void parse_opts(int *options, int *count, int argc, char *argv[]);
  void init_array(git_strarray *array, int argc, char **argv);
  int print_matched_cb(const char *path, const char *matched_pathspec, void *payload);
  
  int lg2_add(git_repository *repo, int argc, char** argv)
  {
  	git_index_matched_path_cb matched_cb = NULL;
  	git_index *index;
  	git_strarray array = {0};
  	int options = 0, count = 0;
  	struct print_payload payload = {0};
  
  	parse_opts(&options, &count, argc, argv);
  
  	init_array(&array, argc-count, argv+count);
  
  	check_lg2(git_repository_index(&index, repo), "Could not open repository index", NULL);
  
  	if (options&VERBOSE || options&SKIP) {
  		matched_cb = &print_matched_cb;
  	}
  
  	payload.options = options;
  	payload.repo = repo;
  
  	if (options&UPDATE) {
  		git_index_update_all(index, &array, matched_cb, &payload);
  	} else {
  		git_index_add_all(index, &array, 0, matched_cb, &payload);
  	}
  
  	git_index_write(index);
  	git_index_free(index);
  
  	return 0;
  }
  
  int print_matched_cb(const char *path, const char *matched_pathspec, void *payload)
  {
  	struct print_payload p = *(struct print_payload*)(payload);
  	int ret;
  	unsigned status;
  	(void)matched_pathspec;
  
  	if (git_status_file(&status, p.repo, path)) {
  		return -1;
  	}
  
  	if (status & GIT_STATUS_WT_MODIFIED || status & GIT_STATUS_WT_NEW) {
  		printf("add '%s'\n", path);
  		ret = 0;
  	} else {
  		ret = 1;
  	}
  
  	if(p.options & SKIP) {
  		ret = 1;
  	}
  
  	return ret;
  }
  
  void init_array(git_strarray *array, int argc, char **argv)
  {
  	unsigned int i;
  
  	array->count = argc;
  	array->strings = malloc(sizeof(char*) * array->count);
  	assert(array->strings!=NULL);
  
  	for(i=0; i<array->count; i++) {
  		array->strings[i]=argv[i];
  	}
  
  	return;
  }
  
  void print_usage(void)
  {
  	fprintf(stderr, "usage: add [options] [--] file-spec [file-spec] [...]\n\n");
  	fprintf(stderr, "\t-n, --dry-run    dry run\n");
  	fprintf(stderr, "\t-v, --verbose    be verbose\n");
  	fprintf(stderr, "\t-u, --update     update tracked files\n");
  	exit(1);
  }
  
  static void parse_opts(int *options, int *count, int argc, char *argv[])
  {
  	int i;
  
  	for (i = 1; i < argc; ++i) {
  		if (argv[i][0] != '-') {
  			break;
  		}
  		else if(!strcmp(argv[i], "--verbose") || !strcmp(argv[i], "-v")) {
  			*options |= VERBOSE;
  		}
  		else if(!strcmp(argv[i], "--dry-run") || !strcmp(argv[i], "-n")) {
  			*options |= SKIP;
  		}
  		else if(!strcmp(argv[i], "--update") || !strcmp(argv[i], "-u")) {
  			*options |= UPDATE;
  		}
  		else if(!strcmp(argv[i], "-h")) {
  			print_usage();
  			break;
  		}
  		else if(!strcmp(argv[i], "--")) {
  			i++;
  			break;
  		}
  		else {
  			fprintf(stderr, "Unsupported option %s.\n", argv[i]);
  			print_usage();
  		}
  	}
  
  	if (argc<=i)
  		print_usage();
  
  	*count = i;
  }
  

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