/*
 * Builtin "git log" and related commands (show, whatchanged)
 *
 * (C) Copyright 2006 Linus Torvalds
 *               2006 Junio Hamano
 */
#include "cache.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "log-tree.h"
#include "builtin.h"

/* this is in builtin-diff.c */
void add_head(struct rev_info *revs);

static int cmd_log_wc(int argc, const char **argv, char **envp,
                      struct rev_info *rev)
{
        struct commit *commit;

        rev->abbrev = DEFAULT_ABBREV;
        rev->commit_format = CMIT_FMT_DEFAULT;
        rev->verbose_header = 1;
        argc = setup_revisions(argc, argv, rev, "HEAD");

        if (argc > 1)
                die("unrecognized argument: %s", argv[1]);

        prepare_revision_walk(rev);
        setup_pager();
        while ((commit = get_revision(rev)) != NULL) {
                log_tree_commit(rev, commit);
                free(commit->buffer);
                commit->buffer = NULL;
        }
        return 0;
}

int cmd_whatchanged(int argc, const char **argv, char **envp)
{
        struct rev_info rev;

        init_revisions(&rev);
        rev.diff = 1;
        rev.diffopt.recursive = 1;
        return cmd_log_wc(argc, argv, envp, &rev);
}

int cmd_show(int argc, const char **argv, char **envp)
{
        struct rev_info rev;

        init_revisions(&rev);
        rev.diff = 1;
        rev.diffopt.recursive = 1;
        rev.combine_merges = 1;
        rev.dense_combined_merges = 1;
        rev.always_show_header = 1;
        rev.ignore_merges = 0;
        rev.no_walk = 1;
        return cmd_log_wc(argc, argv, envp, &rev);
}

int cmd_log(int argc, const char **argv, char **envp)
{
        struct rev_info rev;

        init_revisions(&rev);
        rev.always_show_header = 1;
        rev.diffopt.recursive = 1;
        return cmd_log_wc(argc, argv, envp, &rev);
}

static int istitlechar(char c)
{
        return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
                (c >= '0' && c <= '9') || c == '.' || c == '_';
}

static FILE *realstdout = NULL;
static char *output_directory = NULL;

static void reopen_stdout(struct commit *commit, int nr, int keep_subject)
{
        char filename[1024];
        char *sol;
        int len = 0;

        if (output_directory) {
                strncpy(filename, output_directory, 1010);
                len = strlen(filename);
                if (filename[len - 1] != '/')
                        filename[len++] = '/';
        }

        sprintf(filename + len, "%04d", nr);
        len = strlen(filename);

        sol = strstr(commit->buffer, "\n\n");
        if (sol) {
                int j, space = 1;

                sol += 2;
                /* strip [PATCH] or [PATCH blabla] */
                if (!keep_subject && !strncmp(sol, "[PATCH", 6)) {
                        char *eos = strchr(sol + 6, ']');
                        if (eos) {
                                while (isspace(*eos))
                                        eos++;
                                sol = eos;
                        }
                }

                for (j = 0; len < 1024 - 6 && sol[j] && sol[j] != '\n'; j++) {
                        if (istitlechar(sol[j])) {
                                if (space) {
                                        filename[len++] = '-';
                                        space = 0;
                                }
                                filename[len++] = sol[j];
                                if (sol[j] == '.')
                                        while (sol[j + 1] == '.')
                                                j++;
                        } else
                                space = 1;
                }
                while (filename[len - 1] == '.' || filename[len - 1] == '-')
                        len--;
        }
        strcpy(filename + len, ".txt");
        fprintf(realstdout, "%s\n", filename);
        freopen(filename, "w", stdout);
}

int cmd_format_patch(int argc, const char **argv, char **envp)
{
        struct commit *commit;
        struct commit **list = NULL;
        struct rev_info rev;
        int nr = 0, total, i, j;
        int use_stdout = 0;
        int numbered = 0;
        int keep_subject = 0;

        init_revisions(&rev);
        rev.commit_format = CMIT_FMT_EMAIL;
        rev.verbose_header = 1;
        rev.diff = 1;
        rev.diffopt.with_raw = 0;
        rev.diffopt.with_stat = 1;
        rev.combine_merges = 0;
        rev.ignore_merges = 1;
        rev.diffopt.output_format = DIFF_FORMAT_PATCH;

        /*
         * Parse the arguments before setup_revisions(), or something
         * like "git fmt-patch -o a123 HEAD^.." may fail; a123 is
         * possibly a valid SHA1.
         */
        for (i = 1, j = 1; i < argc; i++) {
                if (!strcmp(argv[i], "--stdout"))
                        use_stdout = 1;
                else if (!strcmp(argv[i], "-n") ||
                                !strcmp(argv[i], "--numbered"))
                        numbered = 1;
                else if (!strcmp(argv[i], "-k") ||
                                !strcmp(argv[i], "--keep-subject")) {
                        keep_subject = 1;
                        rev.total = -1;
                } else if (!strcmp(argv[i], "-o")) {
                        if (argc < 3)
                                die ("Which directory?");
                        if (mkdir(argv[i + 1], 0777) < 0 && errno != EEXIST)
                                die("Could not create directory %s",
                                                argv[i + 1]);
                        output_directory = strdup(argv[i + 1]);
                        i++;
                } else
                        argv[j++] = argv[i];
        }
        argc = j;

        if (numbered && keep_subject < 0)
                die ("-n and -k are mutually exclusive.");

        argc = setup_revisions(argc, argv, &rev, "HEAD");
        if (argc > 1)
                die ("unrecognized argument: %s", argv[1]);

        if (rev.pending_objects && rev.pending_objects->next == NULL) {
                rev.pending_objects->item->flags |= UNINTERESTING;
                add_head(&rev);
        }

        if (!use_stdout)
                realstdout = fdopen(dup(1), "w");

        prepare_revision_walk(&rev);
        while ((commit = get_revision(&rev)) != NULL) {
                /* ignore merges */
                if (commit->parents && commit->parents->next)
                        continue;
                nr++;
                list = realloc(list, nr * sizeof(list[0]));
                list[nr - 1] = commit;
        }
        total = nr;
        if (numbered)
                rev.total = total;
        while (0 <= --nr) {
                int shown;
                commit = list[nr];
                rev.nr = total - nr;
                if (!use_stdout)
                        reopen_stdout(commit, rev.nr, keep_subject);
                shown = log_tree_commit(&rev, commit);
                free(commit->buffer);
                commit->buffer = NULL;
                if (shown)
                        printf("-- \n%s\n\n", git_version_string);
                if (!use_stdout)
                        fclose(stdout);
        }
        if (output_directory)
                free(output_directory);
        free(list);
        return 0;
}