/*
 * "git add" builtin command
 *
 * Copyright (C) 2006 Linus Torvalds
 */
#include "cache.h"
#include "builtin.h"
#include "dir.h"
#include "exec_cmd.h"
#include "cache-tree.h"
#include "diff.h"
#include "diffcore.h"
#include "commit.h"
#include "revision.h"
#include "run-command.h"
#include "parse-options.h"

static const char * const builtin_add_usage[] = {
        "git-add [options] [--] <filepattern>...",
        NULL
};

static int take_worktree_changes;

static void prune_directory(struct dir_struct *dir, const char **pathspec, int prefix)
{
        char *seen;
        int i, specs;
        struct dir_entry **src, **dst;

        for (specs = 0; pathspec[specs];  specs++)
                /* nothing */;
        seen = xcalloc(specs, 1);

        src = dst = dir->entries;
        i = dir->nr;
        while (--i >= 0) {
                struct dir_entry *entry = *src++;
                if (match_pathspec(pathspec, entry->name, entry->len,
                                   prefix, seen))
                        *dst++ = entry;
        }
        dir->nr = dst - dir->entries;

        for (i = 0; i < specs; i++) {
                if (!seen[i] && !file_exists(pathspec[i]))
                        die("pathspec '%s' did not match any files",
                                        pathspec[i]);
        }
        free(seen);
}

static void fill_directory(struct dir_struct *dir, const char **pathspec,
                int ignored_too)
{
        const char *path, *base;
        int baselen;

        /* Set up the default git porcelain excludes */
        memset(dir, 0, sizeof(*dir));
        if (!ignored_too) {
                dir->collect_ignored = 1;
                setup_standard_excludes(dir);
        }

        /*
         * Calculate common prefix for the pathspec, and
         * use that to optimize the directory walk
         */
        baselen = common_prefix(pathspec);
        path = ".";
        base = "";
        if (baselen)
                path = base = xmemdupz(*pathspec, baselen);

        /* Read the directory and prune it */
        read_directory(dir, path, base, baselen, pathspec);
        if (pathspec)
                prune_directory(dir, pathspec, baselen);
}

static void update_callback(struct diff_queue_struct *q,
                            struct diff_options *opt, void *cbdata)
{
        int i, verbose;

        verbose = *((int *)cbdata);
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
                const char *path = p->one->path;
                switch (p->status) {
                default:
                        die("unexpected diff status %c", p->status);
                case DIFF_STATUS_UNMERGED:
                case DIFF_STATUS_MODIFIED:
                case DIFF_STATUS_TYPE_CHANGED:
                        add_file_to_cache(path, verbose);
                        break;
                case DIFF_STATUS_DELETED:
                        remove_file_from_cache(path);
                        if (verbose)
                                printf("remove '%s'\n", path);
                        break;
                }
        }
}

void add_files_to_cache(int verbose, const char *prefix, const char **pathspec)
{
        struct rev_info rev;
        init_revisions(&rev, prefix);
        setup_revisions(0, NULL, &rev, NULL);
        rev.prune_data = pathspec;
        rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
        rev.diffopt.format_callback = update_callback;
        rev.diffopt.format_callback_data = &verbose;
        run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
}

static void refresh(int verbose, const char **pathspec)
{
        char *seen;
        int i, specs;

        for (specs = 0; pathspec[specs];  specs++)
                /* nothing */;
        seen = xcalloc(specs, 1);
        if (read_cache() < 0)
                die("index file corrupt");
        refresh_index(&the_index, verbose ? 0 : REFRESH_QUIET, pathspec, seen);
        for (i = 0; i < specs; i++) {
                if (!seen[i])
                        die("pathspec '%s' did not match any files", pathspec[i]);
        }
        free(seen);
}

int interactive_add(int argc, const char **argv)
{
        int status;
        const char **args = xcalloc(sizeof(const char *), (argc + 2));

        args[0] = "add--interactive";
        memcpy(&(args[1]), argv, sizeof(const char *) * argc);
        args[argc + 1] = NULL;

        status = run_command_v_opt(args, RUN_GIT_CMD);
        free(args);
        return status;
}

static struct lock_file lock_file;

static const char ignore_error[] =
"The following paths are ignored by one of your .gitignore files:\n";

static int verbose = 0, show_only = 0, ignored_too = 0, refresh_only = 0;
static int add_interactive = 0;

static struct option builtin_add_options[] = {
        OPT__DRY_RUN(&show_only),
        OPT__VERBOSE(&verbose),
        OPT_GROUP(""),
        OPT_BOOLEAN('i', "interactive", &add_interactive, "interactive picking"),
        OPT_BOOLEAN('f', NULL, &ignored_too, "allow adding otherwise ignored files"),
        OPT_BOOLEAN('u', NULL, &take_worktree_changes, "update tracked files"),
        OPT_BOOLEAN( 0 , "refresh", &refresh_only, "don't add, only refresh the index"),
        OPT_END(),
};

int cmd_add(int argc, const char **argv, const char *prefix)
{
        int i, newfd;
        const char **pathspec;
        struct dir_struct dir;

        argc = parse_options(argc, argv, builtin_add_options,
                          builtin_add_usage, 0);
        if (add_interactive)
                exit(interactive_add(argc, argv));

        git_config(git_default_config);

        newfd = hold_locked_index(&lock_file, 1);

        if (take_worktree_changes) {
                const char **pathspec;
                if (read_cache() < 0)
                        die("index file corrupt");
                pathspec = get_pathspec(prefix, argv);
                add_files_to_cache(verbose, prefix, pathspec);
                goto finish;
        }

        if (argc == 0) {
                fprintf(stderr, "Nothing specified, nothing added.\n");
                fprintf(stderr, "Maybe you wanted to say 'git add .'?\n");
                return 0;
        }
        pathspec = get_pathspec(prefix, argv);

        if (refresh_only) {
                refresh(verbose, pathspec);
                goto finish;
        }

        fill_directory(&dir, pathspec, ignored_too);

        if (show_only) {
                const char *sep = "", *eof = "";
                for (i = 0; i < dir.nr; i++) {
                        printf("%s%s", sep, dir.entries[i]->name);
                        sep = " ";
                        eof = "\n";
                }
                fputs(eof, stdout);
                return 0;
        }

        if (read_cache() < 0)
                die("index file corrupt");

        if (dir.ignored_nr) {
                fprintf(stderr, ignore_error);
                for (i = 0; i < dir.ignored_nr; i++) {
                        fprintf(stderr, "%s\n", dir.ignored[i]->name);
                }
                fprintf(stderr, "Use -f if you really want to add them.\n");
                die("no files added");
        }

        for (i = 0; i < dir.nr; i++)
                add_file_to_cache(dir.entries[i]->name, verbose);

 finish:
        if (active_cache_changed) {
                if (write_cache(newfd, active_cache, active_nr) ||
                    close(newfd) || commit_locked_index(&lock_file))
                        die("Unable to write new index file");
        }

        return 0;
}