push --force-with-lease: implement logic to populate old_sha1_expect[]

[alt-git.git] / wt-status.c

#include "cache.h"
#include "wt-status.h"
#include "object.h"
#include "dir.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "diffcore.h"
#include "quote.h"
#include "run-command.h"
#include "remote.h"
#include "refs.h"
#include "submodule.h"
#include "column.h"
#include "strbuf.h"

static char default_wt_status_colors[][COLOR_MAXLEN] = {
        GIT_COLOR_NORMAL, /* WT_STATUS_HEADER */
        GIT_COLOR_GREEN,  /* WT_STATUS_UPDATED */
        GIT_COLOR_RED,    /* WT_STATUS_CHANGED */
        GIT_COLOR_RED,    /* WT_STATUS_UNTRACKED */
        GIT_COLOR_RED,    /* WT_STATUS_NOBRANCH */
        GIT_COLOR_RED,    /* WT_STATUS_UNMERGED */
        GIT_COLOR_GREEN,  /* WT_STATUS_LOCAL_BRANCH */
        GIT_COLOR_RED,    /* WT_STATUS_REMOTE_BRANCH */
        GIT_COLOR_NIL,    /* WT_STATUS_ONBRANCH */
};

static const char *color(int slot, struct wt_status *s)
{
        const char *c = "";
        if (want_color(s->use_color))
                c = s->color_palette[slot];
        if (slot == WT_STATUS_ONBRANCH && color_is_nil(c))
                c = s->color_palette[WT_STATUS_HEADER];
        return c;
}

static void status_vprintf(struct wt_status *s, int at_bol, const char *color,
                const char *fmt, va_list ap, const char *trail)
{
        struct strbuf sb = STRBUF_INIT;
        struct strbuf linebuf = STRBUF_INIT;
        const char *line, *eol;

        strbuf_vaddf(&sb, fmt, ap);
        if (!sb.len) {
                strbuf_addch(&sb, comment_line_char);
                if (!trail)
                        strbuf_addch(&sb, ' ');
                color_print_strbuf(s->fp, color, &sb);
                if (trail)
                        fprintf(s->fp, "%s", trail);
                strbuf_release(&sb);
                return;
        }
        for (line = sb.buf; *line; line = eol + 1) {
                eol = strchr(line, '\n');

                strbuf_reset(&linebuf);
                if (at_bol) {
                        strbuf_addch(&linebuf, comment_line_char);
                        if (*line != '\n' && *line != '\t')
                                strbuf_addch(&linebuf, ' ');
                }
                if (eol)
                        strbuf_add(&linebuf, line, eol - line);
                else
                        strbuf_addstr(&linebuf, line);
                color_print_strbuf(s->fp, color, &linebuf);
                if (eol)
                        fprintf(s->fp, "\n");
                else
                        break;
                at_bol = 1;
        }
        if (trail)
                fprintf(s->fp, "%s", trail);
        strbuf_release(&linebuf);
        strbuf_release(&sb);
}

void status_printf_ln(struct wt_status *s, const char *color,
                        const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        status_vprintf(s, 1, color, fmt, ap, "\n");
        va_end(ap);
}

void status_printf(struct wt_status *s, const char *color,
                        const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        status_vprintf(s, 1, color, fmt, ap, NULL);
        va_end(ap);
}

static void status_printf_more(struct wt_status *s, const char *color,
                               const char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        status_vprintf(s, 0, color, fmt, ap, NULL);
        va_end(ap);
}

void wt_status_prepare(struct wt_status *s)
{
        unsigned char sha1[20];

        memset(s, 0, sizeof(*s));
        memcpy(s->color_palette, default_wt_status_colors,
               sizeof(default_wt_status_colors));
        s->show_untracked_files = SHOW_NORMAL_UNTRACKED_FILES;
        s->use_color = -1;
        s->relative_paths = 1;
        s->branch = resolve_refdup("HEAD", sha1, 0, NULL);
        s->reference = "HEAD";
        s->fp = stdout;
        s->index_file = get_index_file();
        s->change.strdup_strings = 1;
        s->untracked.strdup_strings = 1;
        s->ignored.strdup_strings = 1;
}

static void wt_status_print_unmerged_header(struct wt_status *s)
{
        int i;
        int del_mod_conflict = 0;
        int both_deleted = 0;
        int not_deleted = 0;
        const char *c = color(WT_STATUS_HEADER, s);

        status_printf_ln(s, c, _("Unmerged paths:"));

        for (i = 0; i < s->change.nr; i++) {
                struct string_list_item *it = &(s->change.items[i]);
                struct wt_status_change_data *d = it->util;

                switch (d->stagemask) {
                case 0:
                        break;
                case 1:
                        both_deleted = 1;
                        break;
                case 3:
                case 5:
                        del_mod_conflict = 1;
                        break;
                default:
                        not_deleted = 1;
                        break;
                }
        }

        if (!advice_status_hints)
                return;
        if (s->whence != FROM_COMMIT)
                ;
        else if (!s->is_initial)
                status_printf_ln(s, c, _("  (use \"git reset %s <file>...\" to unstage)"), s->reference);
        else
                status_printf_ln(s, c, _("  (use \"git rm --cached <file>...\" to unstage)"));

        if (!both_deleted) {
                if (!del_mod_conflict)
                        status_printf_ln(s, c, _("  (use \"git add <file>...\" to mark resolution)"));
                else
                        status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
        } else if (!del_mod_conflict && !not_deleted) {
                status_printf_ln(s, c, _("  (use \"git rm <file>...\" to mark resolution)"));
        } else {
                status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as appropriate to mark resolution)"));
        }
        status_printf_ln(s, c, "");
}

static void wt_status_print_cached_header(struct wt_status *s)
{
        const char *c = color(WT_STATUS_HEADER, s);

        status_printf_ln(s, c, _("Changes to be committed:"));
        if (!advice_status_hints)
                return;
        if (s->whence != FROM_COMMIT)
                ; /* NEEDSWORK: use "git reset --unresolve"??? */
        else if (!s->is_initial)
                status_printf_ln(s, c, _("  (use \"git reset %s <file>...\" to unstage)"), s->reference);
        else
                status_printf_ln(s, c, _("  (use \"git rm --cached <file>...\" to unstage)"));
        status_printf_ln(s, c, "");
}

static void wt_status_print_dirty_header(struct wt_status *s,
                                         int has_deleted,
                                         int has_dirty_submodules)
{
        const char *c = color(WT_STATUS_HEADER, s);

        status_printf_ln(s, c, _("Changes not staged for commit:"));
        if (!advice_status_hints)
                return;
        if (!has_deleted)
                status_printf_ln(s, c, _("  (use \"git add <file>...\" to update what will be committed)"));
        else
                status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" to update what will be committed)"));
        status_printf_ln(s, c, _("  (use \"git checkout -- <file>...\" to discard changes in working directory)"));
        if (has_dirty_submodules)
                status_printf_ln(s, c, _("  (commit or discard the untracked or modified content in submodules)"));
        status_printf_ln(s, c, "");
}

static void wt_status_print_other_header(struct wt_status *s,
                                         const char *what,
                                         const char *how)
{
        const char *c = color(WT_STATUS_HEADER, s);
        status_printf_ln(s, c, "%s:", what);
        if (!advice_status_hints)
                return;
        status_printf_ln(s, c, _("  (use \"git %s <file>...\" to include in what will be committed)"), how);
        status_printf_ln(s, c, "");
}

static void wt_status_print_trailer(struct wt_status *s)
{
        status_printf_ln(s, color(WT_STATUS_HEADER, s), "");
}

#define quote_path quote_path_relative

static void wt_status_print_unmerged_data(struct wt_status *s,
                                          struct string_list_item *it)
{
        const char *c = color(WT_STATUS_UNMERGED, s);
        struct wt_status_change_data *d = it->util;
        struct strbuf onebuf = STRBUF_INIT;
        const char *one, *how = _("bug");

        one = quote_path(it->string, -1, &onebuf, s->prefix);
        status_printf(s, color(WT_STATUS_HEADER, s), "\t");
        switch (d->stagemask) {
        case 1: how = _("both deleted:"); break;
        case 2: how = _("added by us:"); break;
        case 3: how = _("deleted by them:"); break;
        case 4: how = _("added by them:"); break;
        case 5: how = _("deleted by us:"); break;
        case 6: how = _("both added:"); break;
        case 7: how = _("both modified:"); break;
        }
        status_printf_more(s, c, "%-20s%s\n", how, one);
        strbuf_release(&onebuf);
}

static void wt_status_print_change_data(struct wt_status *s,
                                        int change_type,
                                        struct string_list_item *it)
{
        struct wt_status_change_data *d = it->util;
        const char *c = color(change_type, s);
        int status;
        char *one_name;
        char *two_name;
        const char *one, *two;
        struct strbuf onebuf = STRBUF_INIT, twobuf = STRBUF_INIT;
        struct strbuf extra = STRBUF_INIT;

        one_name = two_name = it->string;
        switch (change_type) {
        case WT_STATUS_UPDATED:
                status = d->index_status;
                if (d->head_path)
                        one_name = d->head_path;
                break;
        case WT_STATUS_CHANGED:
                if (d->new_submodule_commits || d->dirty_submodule) {
                        strbuf_addstr(&extra, " (");
                        if (d->new_submodule_commits)
                                strbuf_addf(&extra, _("new commits, "));
                        if (d->dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
                                strbuf_addf(&extra, _("modified content, "));
                        if (d->dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
                                strbuf_addf(&extra, _("untracked content, "));
                        strbuf_setlen(&extra, extra.len - 2);
                        strbuf_addch(&extra, ')');
                }
                status = d->worktree_status;
                break;
        default:
                die("BUG: unhandled change_type %d in wt_status_print_change_data",
                    change_type);
        }

        one = quote_path(one_name, -1, &onebuf, s->prefix);
        two = quote_path(two_name, -1, &twobuf, s->prefix);

        status_printf(s, color(WT_STATUS_HEADER, s), "\t");
        switch (status) {
        case DIFF_STATUS_ADDED:
                status_printf_more(s, c, _("new file:   %s"), one);
                break;
        case DIFF_STATUS_COPIED:
                status_printf_more(s, c, _("copied:     %s -> %s"), one, two);
                break;
        case DIFF_STATUS_DELETED:
                status_printf_more(s, c, _("deleted:    %s"), one);
                break;
        case DIFF_STATUS_MODIFIED:
                status_printf_more(s, c, _("modified:   %s"), one);
                break;
        case DIFF_STATUS_RENAMED:
                status_printf_more(s, c, _("renamed:    %s -> %s"), one, two);
                break;
        case DIFF_STATUS_TYPE_CHANGED:
                status_printf_more(s, c, _("typechange: %s"), one);
                break;
        case DIFF_STATUS_UNKNOWN:
                status_printf_more(s, c, _("unknown:    %s"), one);
                break;
        case DIFF_STATUS_UNMERGED:
                status_printf_more(s, c, _("unmerged:   %s"), one);
                break;
        default:
                die(_("bug: unhandled diff status %c"), status);
        }
        if (extra.len) {
                status_printf_more(s, color(WT_STATUS_HEADER, s), "%s", extra.buf);
                strbuf_release(&extra);
        }
        status_printf_more(s, GIT_COLOR_NORMAL, "\n");
        strbuf_release(&onebuf);
        strbuf_release(&twobuf);
}

static void wt_status_collect_changed_cb(struct diff_queue_struct *q,
                                         struct diff_options *options,
                                         void *data)
{
        struct wt_status *s = data;
        int i;

        if (!q->nr)
                return;
        s->workdir_dirty = 1;
        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p;
                struct string_list_item *it;
                struct wt_status_change_data *d;

                p = q->queue[i];
                it = string_list_insert(&s->change, p->one->path);
                d = it->util;
                if (!d) {
                        d = xcalloc(1, sizeof(*d));
                        it->util = d;
                }
                if (!d->worktree_status)
                        d->worktree_status = p->status;
                d->dirty_submodule = p->two->dirty_submodule;
                if (S_ISGITLINK(p->two->mode))
                        d->new_submodule_commits = !!hashcmp(p->one->sha1, p->two->sha1);
        }
}

static int unmerged_mask(const char *path)
{
        int pos, mask;
        struct cache_entry *ce;

        pos = cache_name_pos(path, strlen(path));
        if (0 <= pos)
                return 0;

        mask = 0;
        pos = -pos-1;
        while (pos < active_nr) {
                ce = active_cache[pos++];
                if (strcmp(ce->name, path) || !ce_stage(ce))
                        break;
                mask |= (1 << (ce_stage(ce) - 1));
        }
        return mask;
}

static void wt_status_collect_updated_cb(struct diff_queue_struct *q,
                                         struct diff_options *options,
                                         void *data)
{
        struct wt_status *s = data;
        int i;

        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p;
                struct string_list_item *it;
                struct wt_status_change_data *d;

                p = q->queue[i];
                it = string_list_insert(&s->change, p->two->path);
                d = it->util;
                if (!d) {
                        d = xcalloc(1, sizeof(*d));
                        it->util = d;
                }
                if (!d->index_status)
                        d->index_status = p->status;
                switch (p->status) {
                case DIFF_STATUS_COPIED:
                case DIFF_STATUS_RENAMED:
                        d->head_path = xstrdup(p->one->path);
                        break;
                case DIFF_STATUS_UNMERGED:
                        d->stagemask = unmerged_mask(p->two->path);
                        break;
                }
        }
}

static void wt_status_collect_changes_worktree(struct wt_status *s)
{
        struct rev_info rev;

        init_revisions(&rev, NULL);
        setup_revisions(0, NULL, &rev, NULL);
        rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
        DIFF_OPT_SET(&rev.diffopt, DIRTY_SUBMODULES);
        if (!s->show_untracked_files)
                DIFF_OPT_SET(&rev.diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
        if (s->ignore_submodule_arg) {
                DIFF_OPT_SET(&rev.diffopt, OVERRIDE_SUBMODULE_CONFIG);
                handle_ignore_submodules_arg(&rev.diffopt, s->ignore_submodule_arg);
        }
        rev.diffopt.format_callback = wt_status_collect_changed_cb;
        rev.diffopt.format_callback_data = s;
        init_pathspec(&rev.prune_data, s->pathspec);
        run_diff_files(&rev, 0);
}

static void wt_status_collect_changes_index(struct wt_status *s)
{
        struct rev_info rev;
        struct setup_revision_opt opt;

        init_revisions(&rev, NULL);
        memset(&opt, 0, sizeof(opt));
        opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
        setup_revisions(0, NULL, &rev, &opt);

        if (s->ignore_submodule_arg) {
                DIFF_OPT_SET(&rev.diffopt, OVERRIDE_SUBMODULE_CONFIG);
                handle_ignore_submodules_arg(&rev.diffopt, s->ignore_submodule_arg);
        }

        rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
        rev.diffopt.format_callback = wt_status_collect_updated_cb;
        rev.diffopt.format_callback_data = s;
        rev.diffopt.detect_rename = 1;
        rev.diffopt.rename_limit = 200;
        rev.diffopt.break_opt = 0;
        init_pathspec(&rev.prune_data, s->pathspec);
        run_diff_index(&rev, 1);
}

static void wt_status_collect_changes_initial(struct wt_status *s)
{
        struct pathspec pathspec;
        int i;

        init_pathspec(&pathspec, s->pathspec);
        for (i = 0; i < active_nr; i++) {
                struct string_list_item *it;
                struct wt_status_change_data *d;
                struct cache_entry *ce = active_cache[i];

                if (!ce_path_match(ce, &pathspec))
                        continue;
                it = string_list_insert(&s->change, ce->name);
                d = it->util;
                if (!d) {
                        d = xcalloc(1, sizeof(*d));
                        it->util = d;
                }
                if (ce_stage(ce)) {
                        d->index_status = DIFF_STATUS_UNMERGED;
                        d->stagemask |= (1 << (ce_stage(ce) - 1));
                }
                else
                        d->index_status = DIFF_STATUS_ADDED;
        }
        free_pathspec(&pathspec);
}

static void wt_status_collect_untracked(struct wt_status *s)
{
        int i;
        struct dir_struct dir;
        struct timeval t_begin;

        if (!s->show_untracked_files)
                return;

        if (advice_status_u_option)
                gettimeofday(&t_begin, NULL);

        memset(&dir, 0, sizeof(dir));
        if (s->show_untracked_files != SHOW_ALL_UNTRACKED_FILES)
                dir.flags |=
                        DIR_SHOW_OTHER_DIRECTORIES | DIR_HIDE_EMPTY_DIRECTORIES;
        if (s->show_ignored_files)
                dir.flags |= DIR_SHOW_IGNORED_TOO;
        setup_standard_excludes(&dir);

        fill_directory(&dir, s->pathspec);

        for (i = 0; i < dir.nr; i++) {
                struct dir_entry *ent = dir.entries[i];
                if (cache_name_is_other(ent->name, ent->len) &&
                    match_pathspec(s->pathspec, ent->name, ent->len, 0, NULL))
                        string_list_insert(&s->untracked, ent->name);
                free(ent);
        }

        for (i = 0; i < dir.ignored_nr; i++) {
                struct dir_entry *ent = dir.ignored[i];
                if (cache_name_is_other(ent->name, ent->len) &&
                    match_pathspec(s->pathspec, ent->name, ent->len, 0, NULL))
                        string_list_insert(&s->ignored, ent->name);
                free(ent);
        }

        free(dir.entries);
        free(dir.ignored);
        clear_directory(&dir);

        if (advice_status_u_option) {
                struct timeval t_end;
                gettimeofday(&t_end, NULL);
                s->untracked_in_ms =
                        (uint64_t)t_end.tv_sec * 1000 + t_end.tv_usec / 1000 -
                        ((uint64_t)t_begin.tv_sec * 1000 + t_begin.tv_usec / 1000);
        }
}

void wt_status_collect(struct wt_status *s)
{
        wt_status_collect_changes_worktree(s);

        if (s->is_initial)
                wt_status_collect_changes_initial(s);
        else
                wt_status_collect_changes_index(s);
        wt_status_collect_untracked(s);
}

static void wt_status_print_unmerged(struct wt_status *s)
{
        int shown_header = 0;
        int i;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->stagemask)
                        continue;
                if (!shown_header) {
                        wt_status_print_unmerged_header(s);
                        shown_header = 1;
                }
                wt_status_print_unmerged_data(s, it);
        }
        if (shown_header)
                wt_status_print_trailer(s);

}

static void wt_status_print_updated(struct wt_status *s)
{
        int shown_header = 0;
        int i;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->index_status ||
                    d->index_status == DIFF_STATUS_UNMERGED)
                        continue;
                if (!shown_header) {
                        wt_status_print_cached_header(s);
                        s->commitable = 1;
                        shown_header = 1;
                }
                wt_status_print_change_data(s, WT_STATUS_UPDATED, it);
        }
        if (shown_header)
                wt_status_print_trailer(s);
}

/*
 * -1 : has delete
 *  0 : no change
 *  1 : some change but no delete
 */
static int wt_status_check_worktree_changes(struct wt_status *s,
                                             int *dirty_submodules)
{
        int i;
        int changes = 0;

        *dirty_submodules = 0;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                d = s->change.items[i].util;
                if (!d->worktree_status ||
                    d->worktree_status == DIFF_STATUS_UNMERGED)
                        continue;
                if (!changes)
                        changes = 1;
                if (d->dirty_submodule)
                        *dirty_submodules = 1;
                if (d->worktree_status == DIFF_STATUS_DELETED)
                        changes = -1;
        }
        return changes;
}

static void wt_status_print_changed(struct wt_status *s)
{
        int i, dirty_submodules;
        int worktree_changes = wt_status_check_worktree_changes(s, &dirty_submodules);

        if (!worktree_changes)
                return;

        wt_status_print_dirty_header(s, worktree_changes < 0, dirty_submodules);

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;
                it = &(s->change.items[i]);
                d = it->util;
                if (!d->worktree_status ||
                    d->worktree_status == DIFF_STATUS_UNMERGED)
                        continue;
                wt_status_print_change_data(s, WT_STATUS_CHANGED, it);
        }
        wt_status_print_trailer(s);
}

static void wt_status_print_submodule_summary(struct wt_status *s, int uncommitted)
{
        struct child_process sm_summary;
        char summary_limit[64];
        char index[PATH_MAX];
        const char *env[] = { NULL, NULL };
        const char *argv[8];

        env[0] =        index;
        argv[0] =       "submodule";
        argv[1] =       "summary";
        argv[2] =       uncommitted ? "--files" : "--cached";
        argv[3] =       "--for-status";
        argv[4] =       "--summary-limit";
        argv[5] =       summary_limit;
        argv[6] =       uncommitted ? NULL : (s->amend ? "HEAD^" : "HEAD");
        argv[7] =       NULL;

        sprintf(summary_limit, "%d", s->submodule_summary);
        snprintf(index, sizeof(index), "GIT_INDEX_FILE=%s", s->index_file);

        memset(&sm_summary, 0, sizeof(sm_summary));
        sm_summary.argv = argv;
        sm_summary.env = env;
        sm_summary.git_cmd = 1;
        sm_summary.no_stdin = 1;
        fflush(s->fp);
        sm_summary.out = dup(fileno(s->fp));    /* run_command closes it */
        run_command(&sm_summary);
}

static void wt_status_print_other(struct wt_status *s,
                                  struct string_list *l,
                                  const char *what,
                                  const char *how)
{
        int i;
        struct strbuf buf = STRBUF_INIT;
        static struct string_list output = STRING_LIST_INIT_DUP;
        struct column_options copts;

        if (!l->nr)
                return;

        wt_status_print_other_header(s, what, how);

        for (i = 0; i < l->nr; i++) {
                struct string_list_item *it;
                const char *path;
                it = &(l->items[i]);
                path = quote_path(it->string, strlen(it->string),
                                  &buf, s->prefix);
                if (column_active(s->colopts)) {
                        string_list_append(&output, path);
                        continue;
                }
                status_printf(s, color(WT_STATUS_HEADER, s), "\t");
                status_printf_more(s, color(WT_STATUS_UNTRACKED, s),
                                   "%s\n", path);
        }

        strbuf_release(&buf);
        if (!column_active(s->colopts))
                return;

        strbuf_addf(&buf, "%s#\t%s",
                    color(WT_STATUS_HEADER, s),
                    color(WT_STATUS_UNTRACKED, s));
        memset(&copts, 0, sizeof(copts));
        copts.padding = 1;
        copts.indent = buf.buf;
        if (want_color(s->use_color))
                copts.nl = GIT_COLOR_RESET "\n";
        print_columns(&output, s->colopts, &copts);
        string_list_clear(&output, 0);
        strbuf_release(&buf);
}

static void wt_status_print_verbose(struct wt_status *s)
{
        struct rev_info rev;
        struct setup_revision_opt opt;

        init_revisions(&rev, NULL);
        DIFF_OPT_SET(&rev.diffopt, ALLOW_TEXTCONV);

        memset(&opt, 0, sizeof(opt));
        opt.def = s->is_initial ? EMPTY_TREE_SHA1_HEX : s->reference;
        setup_revisions(0, NULL, &rev, &opt);

        rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
        rev.diffopt.detect_rename = 1;
        rev.diffopt.file = s->fp;
        rev.diffopt.close_file = 0;
        /*
         * If we're not going to stdout, then we definitely don't
         * want color, since we are going to the commit message
         * file (and even the "auto" setting won't work, since it
         * will have checked isatty on stdout).
         */
        if (s->fp != stdout)
                rev.diffopt.use_color = 0;
        run_diff_index(&rev, 1);
}

static void wt_status_print_tracking(struct wt_status *s)
{
        struct strbuf sb = STRBUF_INIT;
        const char *cp, *ep;
        struct branch *branch;

        assert(s->branch && !s->is_initial);
        if (prefixcmp(s->branch, "refs/heads/"))
                return;
        branch = branch_get(s->branch + 11);
        if (!format_tracking_info(branch, &sb))
                return;

        for (cp = sb.buf; (ep = strchr(cp, '\n')) != NULL; cp = ep + 1)
                color_fprintf_ln(s->fp, color(WT_STATUS_HEADER, s),
                                 "%c %.*s", comment_line_char,
                                 (int)(ep - cp), cp);
        color_fprintf_ln(s->fp, color(WT_STATUS_HEADER, s), "%c",
                         comment_line_char);
}

static int has_unmerged(struct wt_status *s)
{
        int i;

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                d = s->change.items[i].util;
                if (d->stagemask)
                        return 1;
        }
        return 0;
}

static void show_merge_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        if (has_unmerged(s)) {
                status_printf_ln(s, color, _("You have unmerged paths."));
                if (advice_status_hints)
                        status_printf_ln(s, color,
                                _("  (fix conflicts and run \"git commit\")"));
        } else {
                status_printf_ln(s, color,
                        _("All conflicts fixed but you are still merging."));
                if (advice_status_hints)
                        status_printf_ln(s, color,
                                _("  (use \"git commit\" to conclude merge)"));
        }
        wt_status_print_trailer(s);
}

static void show_am_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        status_printf_ln(s, color,
                _("You are in the middle of an am session."));
        if (state->am_empty_patch)
                status_printf_ln(s, color,
                        _("The current patch is empty."));
        if (advice_status_hints) {
                if (!state->am_empty_patch)
                        status_printf_ln(s, color,
                                _("  (fix conflicts and then run \"git am --continue\")"));
                status_printf_ln(s, color,
                        _("  (use \"git am --skip\" to skip this patch)"));
                status_printf_ln(s, color,
                        _("  (use \"git am --abort\" to restore the original branch)"));
        }
        wt_status_print_trailer(s);
}

static char *read_line_from_git_path(const char *filename)
{
        struct strbuf buf = STRBUF_INIT;
        FILE *fp = fopen(git_path("%s", filename), "r");
        if (!fp) {
                strbuf_release(&buf);
                return NULL;
        }
        strbuf_getline(&buf, fp, '\n');
        if (!fclose(fp)) {
                return strbuf_detach(&buf, NULL);
        } else {
                strbuf_release(&buf);
                return NULL;
        }
}

static int split_commit_in_progress(struct wt_status *s)
{
        int split_in_progress = 0;
        char *head = read_line_from_git_path("HEAD");
        char *orig_head = read_line_from_git_path("ORIG_HEAD");
        char *rebase_amend = read_line_from_git_path("rebase-merge/amend");
        char *rebase_orig_head = read_line_from_git_path("rebase-merge/orig-head");

        if (!head || !orig_head || !rebase_amend || !rebase_orig_head ||
            !s->branch || strcmp(s->branch, "HEAD"))
                return split_in_progress;

        if (!strcmp(rebase_amend, rebase_orig_head)) {
                if (strcmp(head, rebase_amend))
                        split_in_progress = 1;
        } else if (strcmp(orig_head, rebase_orig_head)) {
                split_in_progress = 1;
        }

        if (!s->amend && !s->nowarn && !s->workdir_dirty)
                split_in_progress = 0;

        free(head);
        free(orig_head);
        free(rebase_amend);
        free(rebase_orig_head);
        return split_in_progress;
}

static void show_rebase_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        struct stat st;

        if (has_unmerged(s)) {
                if (state->branch)
                        status_printf_ln(s, color,
                                         _("You are currently rebasing branch '%s' on '%s'."),
                                         state->branch,
                                         state->onto);
                else
                        status_printf_ln(s, color,
                                         _("You are currently rebasing."));
                if (advice_status_hints) {
                        status_printf_ln(s, color,
                                _("  (fix conflicts and then run \"git rebase --continue\")"));
                        status_printf_ln(s, color,
                                _("  (use \"git rebase --skip\" to skip this patch)"));
                        status_printf_ln(s, color,
                                _("  (use \"git rebase --abort\" to check out the original branch)"));
                }
        } else if (state->rebase_in_progress || !stat(git_path("MERGE_MSG"), &st)) {
                if (state->branch)
                        status_printf_ln(s, color,
                                         _("You are currently rebasing branch '%s' on '%s'."),
                                         state->branch,
                                         state->onto);
                else
                        status_printf_ln(s, color,
                                         _("You are currently rebasing."));
                if (advice_status_hints)
                        status_printf_ln(s, color,
                                _("  (all conflicts fixed: run \"git rebase --continue\")"));
        } else if (split_commit_in_progress(s)) {
                if (state->branch)
                        status_printf_ln(s, color,
                                         _("You are currently splitting a commit while rebasing branch '%s' on '%s'."),
                                         state->branch,
                                         state->onto);
                else
                        status_printf_ln(s, color,
                                         _("You are currently splitting a commit during a rebase."));
                if (advice_status_hints)
                        status_printf_ln(s, color,
                                _("  (Once your working directory is clean, run \"git rebase --continue\")"));
        } else {
                if (state->branch)
                        status_printf_ln(s, color,
                                         _("You are currently editing a commit while rebasing branch '%s' on '%s'."),
                                         state->branch,
                                         state->onto);
                else
                        status_printf_ln(s, color,
                                         _("You are currently editing a commit during a rebase."));
                if (advice_status_hints && !s->amend) {
                        status_printf_ln(s, color,
                                _("  (use \"git commit --amend\" to amend the current commit)"));
                        status_printf_ln(s, color,
                                _("  (use \"git rebase --continue\" once you are satisfied with your changes)"));
                }
        }
        wt_status_print_trailer(s);
}

static void show_cherry_pick_in_progress(struct wt_status *s,
                                        struct wt_status_state *state,
                                        const char *color)
{
        status_printf_ln(s, color, _("You are currently cherry-picking."));
        if (advice_status_hints) {
                if (has_unmerged(s))
                        status_printf_ln(s, color,
                                _("  (fix conflicts and run \"git cherry-pick --continue\")"));
                else
                        status_printf_ln(s, color,
                                _("  (all conflicts fixed: run \"git cherry-pick --continue\")"));
                status_printf_ln(s, color,
                        _("  (use \"git cherry-pick --abort\" to cancel the cherry-pick operation)"));
        }
        wt_status_print_trailer(s);
}

static void show_revert_in_progress(struct wt_status *s,
                                        struct wt_status_state *state,
                                        const char *color)
{
        status_printf_ln(s, color, _("You are currently reverting commit %s."),
                         find_unique_abbrev(state->revert_head_sha1, DEFAULT_ABBREV));
        if (advice_status_hints) {
                if (has_unmerged(s))
                        status_printf_ln(s, color,
                                _("  (fix conflicts and run \"git revert --continue\")"));
                else
                        status_printf_ln(s, color,
                                _("  (all conflicts fixed: run \"git revert --continue\")"));
                status_printf_ln(s, color,
                        _("  (use \"git revert --abort\" to cancel the revert operation)"));
        }
        wt_status_print_trailer(s);
}

static void show_bisect_in_progress(struct wt_status *s,
                                struct wt_status_state *state,
                                const char *color)
{
        if (state->branch)
                status_printf_ln(s, color,
                                 _("You are currently bisecting, started from branch '%s'."),
                                 state->branch);
        else
                status_printf_ln(s, color,
                                 _("You are currently bisecting."));
        if (advice_status_hints)
                status_printf_ln(s, color,
                        _("  (use \"git bisect reset\" to get back to the original branch)"));
        wt_status_print_trailer(s);
}

/*
 * Extract branch information from rebase/bisect
 */
static char *read_and_strip_branch(const char *path)
{
        struct strbuf sb = STRBUF_INIT;
        unsigned char sha1[20];

        if (strbuf_read_file(&sb, git_path("%s", path), 0) <= 0)
                goto got_nothing;

        while (&sb.len && sb.buf[sb.len - 1] == '\n')
                strbuf_setlen(&sb, sb.len - 1);
        if (!sb.len)
                goto got_nothing;
        if (!prefixcmp(sb.buf, "refs/heads/"))
                strbuf_remove(&sb,0, strlen("refs/heads/"));
        else if (!prefixcmp(sb.buf, "refs/"))
                ;
        else if (!get_sha1_hex(sb.buf, sha1)) {
                const char *abbrev;
                abbrev = find_unique_abbrev(sha1, DEFAULT_ABBREV);
                strbuf_reset(&sb);
                strbuf_addstr(&sb, abbrev);
        } else if (!strcmp(sb.buf, "detached HEAD")) /* rebase */
                goto got_nothing;
        else                    /* bisect */
                ;
        return strbuf_detach(&sb, NULL);

got_nothing:
        strbuf_release(&sb);
        return NULL;
}

struct grab_1st_switch_cbdata {
        int found;
        struct strbuf buf;
        unsigned char nsha1[20];
};

static int grab_1st_switch(unsigned char *osha1, unsigned char *nsha1,
                           const char *email, unsigned long timestamp, int tz,
                           const char *message, void *cb_data)
{
        struct grab_1st_switch_cbdata *cb = cb_data;
        const char *target = NULL, *end;

        if (prefixcmp(message, "checkout: moving from "))
                return 0;
        message += strlen("checkout: moving from ");
        target = strstr(message, " to ");
        if (!target)
                return 0;
        target += strlen(" to ");
        strbuf_reset(&cb->buf);
        hashcpy(cb->nsha1, nsha1);
        for (end = target; *end && *end != '\n'; end++)
                ;
        strbuf_add(&cb->buf, target, end - target);
        cb->found = 1;
        return 1;
}

static void wt_status_get_detached_from(struct wt_status_state *state)
{
        struct grab_1st_switch_cbdata cb;
        struct commit *commit;
        unsigned char sha1[20];
        char *ref = NULL;

        strbuf_init(&cb.buf, 0);
        if (for_each_reflog_ent_reverse("HEAD", grab_1st_switch, &cb) <= 0) {
                strbuf_release(&cb.buf);
                return;
        }

        if (dwim_ref(cb.buf.buf, cb.buf.len, sha1, &ref) == 1 &&
            /* sha1 is a commit? match without further lookup */
            (!hashcmp(cb.nsha1, sha1) ||
             /* perhaps sha1 is a tag, try to dereference to a commit */
             ((commit = lookup_commit_reference_gently(sha1, 1)) != NULL &&
              !hashcmp(cb.nsha1, commit->object.sha1)))) {
                int ofs;
                if (!prefixcmp(ref, "refs/tags/"))
                        ofs = strlen("refs/tags/");
                else if (!prefixcmp(ref, "refs/remotes/"))
                        ofs = strlen("refs/remotes/");
                else
                        ofs = 0;
                state->detached_from = xstrdup(ref + ofs);
        } else
                state->detached_from =
                        xstrdup(find_unique_abbrev(cb.nsha1, DEFAULT_ABBREV));
        hashcpy(state->detached_sha1, cb.nsha1);

        free(ref);
        strbuf_release(&cb.buf);
}

void wt_status_get_state(struct wt_status_state *state,
                         int get_detached_from)
{
        struct stat st;
        unsigned char sha1[20];

        if (!stat(git_path("MERGE_HEAD"), &st)) {
                state->merge_in_progress = 1;
        } else if (!stat(git_path("rebase-apply"), &st)) {
                if (!stat(git_path("rebase-apply/applying"), &st)) {
                        state->am_in_progress = 1;
                        if (!stat(git_path("rebase-apply/patch"), &st) && !st.st_size)
                                state->am_empty_patch = 1;
                } else {
                        state->rebase_in_progress = 1;
                        state->branch = read_and_strip_branch("rebase-apply/head-name");
                        state->onto = read_and_strip_branch("rebase-apply/onto");
                }
        } else if (!stat(git_path("rebase-merge"), &st)) {
                if (!stat(git_path("rebase-merge/interactive"), &st))
                        state->rebase_interactive_in_progress = 1;
                else
                        state->rebase_in_progress = 1;
                state->branch = read_and_strip_branch("rebase-merge/head-name");
                state->onto = read_and_strip_branch("rebase-merge/onto");
        } else if (!stat(git_path("CHERRY_PICK_HEAD"), &st)) {
                state->cherry_pick_in_progress = 1;
        }
        if (!stat(git_path("BISECT_LOG"), &st)) {
                state->bisect_in_progress = 1;
                state->branch = read_and_strip_branch("BISECT_START");
        }
        if (!stat(git_path("REVERT_HEAD"), &st) &&
            !get_sha1("REVERT_HEAD", sha1)) {
                state->revert_in_progress = 1;
                hashcpy(state->revert_head_sha1, sha1);
        }

        if (get_detached_from)
                wt_status_get_detached_from(state);
}

static void wt_status_print_state(struct wt_status *s,
                                  struct wt_status_state *state)
{
        const char *state_color = color(WT_STATUS_HEADER, s);
        if (state->merge_in_progress)
                show_merge_in_progress(s, state, state_color);
        else if (state->am_in_progress)
                show_am_in_progress(s, state, state_color);
        else if (state->rebase_in_progress || state->rebase_interactive_in_progress)
                show_rebase_in_progress(s, state, state_color);
        else if (state->cherry_pick_in_progress)
                show_cherry_pick_in_progress(s, state, state_color);
        else if (state->revert_in_progress)
                show_revert_in_progress(s, state, state_color);
        if (state->bisect_in_progress)
                show_bisect_in_progress(s, state, state_color);
}

void wt_status_print(struct wt_status *s)
{
        const char *branch_color = color(WT_STATUS_ONBRANCH, s);
        const char *branch_status_color = color(WT_STATUS_HEADER, s);
        struct wt_status_state state;

        memset(&state, 0, sizeof(state));
        wt_status_get_state(&state,
                            s->branch && !strcmp(s->branch, "HEAD"));

        if (s->branch) {
                const char *on_what = _("On branch ");
                const char *branch_name = s->branch;
                if (!prefixcmp(branch_name, "refs/heads/"))
                        branch_name += 11;
                else if (!strcmp(branch_name, "HEAD")) {
                        branch_status_color = color(WT_STATUS_NOBRANCH, s);
                        if (state.detached_from) {
                                unsigned char sha1[20];
                                branch_name = state.detached_from;
                                if (!get_sha1("HEAD", sha1) &&
                                    !hashcmp(sha1, state.detached_sha1))
                                        on_what = _("HEAD detached at ");
                                else
                                        on_what = _("HEAD detached from ");
                        } else {
                                branch_name = "";
                                on_what = _("Not currently on any branch.");
                        }
                }
                status_printf(s, color(WT_STATUS_HEADER, s), "");
                status_printf_more(s, branch_status_color, "%s", on_what);
                status_printf_more(s, branch_color, "%s\n", branch_name);
                if (!s->is_initial)
                        wt_status_print_tracking(s);
        }

        wt_status_print_state(s, &state);
        free(state.branch);
        free(state.onto);
        free(state.detached_from);

        if (s->is_initial) {
                status_printf_ln(s, color(WT_STATUS_HEADER, s), "");
                status_printf_ln(s, color(WT_STATUS_HEADER, s), _("Initial commit"));
                status_printf_ln(s, color(WT_STATUS_HEADER, s), "");
        }

        wt_status_print_updated(s);
        wt_status_print_unmerged(s);
        wt_status_print_changed(s);
        if (s->submodule_summary &&
            (!s->ignore_submodule_arg ||
             strcmp(s->ignore_submodule_arg, "all"))) {
                wt_status_print_submodule_summary(s, 0);  /* staged */
                wt_status_print_submodule_summary(s, 1);  /* unstaged */
        }
        if (s->show_untracked_files) {
                wt_status_print_other(s, &s->untracked, _("Untracked files"), "add");
                if (s->show_ignored_files)
                        wt_status_print_other(s, &s->ignored, _("Ignored files"), "add -f");
                if (advice_status_u_option && 2000 < s->untracked_in_ms) {
                        status_printf_ln(s, GIT_COLOR_NORMAL, "");
                        status_printf_ln(s, GIT_COLOR_NORMAL,
                                         _("It took %.2f seconds to enumerate untracked files. 'status -uno'\n"
                                           "may speed it up, but you have to be careful not to forget to add\n"
                                           "new files yourself (see 'git help status')."),
                                         s->untracked_in_ms / 1000.0);
                }
        } else if (s->commitable)
                status_printf_ln(s, GIT_COLOR_NORMAL, _("Untracked files not listed%s"),
                        advice_status_hints
                        ? _(" (use -u option to show untracked files)") : "");

        if (s->verbose)
                wt_status_print_verbose(s);
        if (!s->commitable) {
                if (s->amend)
                        status_printf_ln(s, GIT_COLOR_NORMAL, _("No changes"));
                else if (s->nowarn)
                        ; /* nothing */
                else if (s->workdir_dirty) {
                        if (advice_status_hints)
                                printf(_("no changes added to commit "
                                         "(use \"git add\" and/or \"git commit -a\")\n"));
                        else
                                printf(_("no changes added to commit\n"));
                } else if (s->untracked.nr) {
                        if (advice_status_hints)
                                printf(_("nothing added to commit but untracked files "
                                         "present (use \"git add\" to track)\n"));
                        else
                                printf(_("nothing added to commit but untracked files present\n"));
                } else if (s->is_initial) {
                        if (advice_status_hints)
                                printf(_("nothing to commit (create/copy files "
                                         "and use \"git add\" to track)\n"));
                        else
                                printf(_("nothing to commit\n"));
                } else if (!s->show_untracked_files) {
                        if (advice_status_hints)
                                printf(_("nothing to commit (use -u to show untracked files)\n"));
                        else
                                printf(_("nothing to commit\n"));
                } else
                        printf(_("nothing to commit, working directory clean\n"));
        }
}

static void wt_shortstatus_unmerged(struct string_list_item *it,
                           struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;
        const char *how = "??";

        switch (d->stagemask) {
        case 1: how = "DD"; break; /* both deleted */
        case 2: how = "AU"; break; /* added by us */
        case 3: how = "UD"; break; /* deleted by them */
        case 4: how = "UA"; break; /* added by them */
        case 5: how = "DU"; break; /* deleted by us */
        case 6: how = "AA"; break; /* both added */
        case 7: how = "UU"; break; /* both modified */
        }
        color_fprintf(s->fp, color(WT_STATUS_UNMERGED, s), "%s", how);
        if (s->null_termination) {
                fprintf(stdout, " %s%c", it->string, 0);
        } else {
                struct strbuf onebuf = STRBUF_INIT;
                const char *one;
                one = quote_path(it->string, -1, &onebuf, s->prefix);
                printf(" %s\n", one);
                strbuf_release(&onebuf);
        }
}

static void wt_shortstatus_status(struct string_list_item *it,
                         struct wt_status *s)
{
        struct wt_status_change_data *d = it->util;

        if (d->index_status)
                color_fprintf(s->fp, color(WT_STATUS_UPDATED, s), "%c", d->index_status);
        else
                putchar(' ');
        if (d->worktree_status)
                color_fprintf(s->fp, color(WT_STATUS_CHANGED, s), "%c", d->worktree_status);
        else
                putchar(' ');
        putchar(' ');
        if (s->null_termination) {
                fprintf(stdout, "%s%c", it->string, 0);
                if (d->head_path)
                        fprintf(stdout, "%s%c", d->head_path, 0);
        } else {
                struct strbuf onebuf = STRBUF_INIT;
                const char *one;
                if (d->head_path) {
                        one = quote_path(d->head_path, -1, &onebuf, s->prefix);
                        if (*one != '"' && strchr(one, ' ') != NULL) {
                                putchar('"');
                                strbuf_addch(&onebuf, '"');
                                one = onebuf.buf;
                        }
                        printf("%s -> ", one);
                        strbuf_release(&onebuf);
                }
                one = quote_path(it->string, -1, &onebuf, s->prefix);
                if (*one != '"' && strchr(one, ' ') != NULL) {
                        putchar('"');
                        strbuf_addch(&onebuf, '"');
                        one = onebuf.buf;
                }
                printf("%s\n", one);
                strbuf_release(&onebuf);
        }
}

static void wt_shortstatus_other(struct string_list_item *it,
                                 struct wt_status *s, const char *sign)
{
        if (s->null_termination) {
                fprintf(stdout, "%s %s%c", sign, it->string, 0);
        } else {
                struct strbuf onebuf = STRBUF_INIT;
                const char *one;
                one = quote_path(it->string, -1, &onebuf, s->prefix);
                color_fprintf(s->fp, color(WT_STATUS_UNTRACKED, s), "%s", sign);
                printf(" %s\n", one);
                strbuf_release(&onebuf);
        }
}

static void wt_shortstatus_print_tracking(struct wt_status *s)
{
        struct branch *branch;
        const char *header_color = color(WT_STATUS_HEADER, s);
        const char *branch_color_local = color(WT_STATUS_LOCAL_BRANCH, s);
        const char *branch_color_remote = color(WT_STATUS_REMOTE_BRANCH, s);

        const char *base;
        const char *branch_name;
        int num_ours, num_theirs;

        color_fprintf(s->fp, color(WT_STATUS_HEADER, s), "## ");

        if (!s->branch)
                return;
        branch_name = s->branch;

        if (!prefixcmp(branch_name, "refs/heads/"))
                branch_name += 11;
        else if (!strcmp(branch_name, "HEAD")) {
                branch_name = _("HEAD (no branch)");
                branch_color_local = color(WT_STATUS_NOBRANCH, s);
        }

        branch = branch_get(s->branch + 11);
        if (s->is_initial)
                color_fprintf(s->fp, header_color, _("Initial commit on "));
        if (!stat_tracking_info(branch, &num_ours, &num_theirs)) {
                color_fprintf(s->fp, branch_color_local, "%s", branch_name);
                fputc(s->null_termination ? '\0' : '\n', s->fp);
                return;
        }

        base = branch->merge[0]->dst;
        base = shorten_unambiguous_ref(base, 0);
        color_fprintf(s->fp, branch_color_local, "%s", branch_name);
        color_fprintf(s->fp, header_color, "...");
        color_fprintf(s->fp, branch_color_remote, "%s", base);

        color_fprintf(s->fp, header_color, " [");
        if (!num_ours) {
                color_fprintf(s->fp, header_color, _("behind "));
                color_fprintf(s->fp, branch_color_remote, "%d", num_theirs);
        } else if (!num_theirs) {
                color_fprintf(s->fp, header_color, _("ahead "));
                color_fprintf(s->fp, branch_color_local, "%d", num_ours);
        } else {
                color_fprintf(s->fp, header_color, _("ahead "));
                color_fprintf(s->fp, branch_color_local, "%d", num_ours);
                color_fprintf(s->fp, header_color, _(", behind "));
                color_fprintf(s->fp, branch_color_remote, "%d", num_theirs);
        }

        color_fprintf(s->fp, header_color, "]");
        fputc(s->null_termination ? '\0' : '\n', s->fp);
}

void wt_shortstatus_print(struct wt_status *s)
{
        int i;

        if (s->show_branch)
                wt_shortstatus_print_tracking(s);

        for (i = 0; i < s->change.nr; i++) {
                struct wt_status_change_data *d;
                struct string_list_item *it;

                it = &(s->change.items[i]);
                d = it->util;
                if (d->stagemask)
                        wt_shortstatus_unmerged(it, s);
                else
                        wt_shortstatus_status(it, s);
        }
        for (i = 0; i < s->untracked.nr; i++) {
                struct string_list_item *it;

                it = &(s->untracked.items[i]);
                wt_shortstatus_other(it, s, "??");
        }
        for (i = 0; i < s->ignored.nr; i++) {
                struct string_list_item *it;

                it = &(s->ignored.items[i]);
                wt_shortstatus_other(it, s, "!!");
        }
}

void wt_porcelain_print(struct wt_status *s)
{
        s->use_color = 0;
        s->relative_paths = 0;
        s->prefix = NULL;
        wt_shortstatus_print(s);
}