Use a more specific option name to express its purpose. --force may come
back as an alias of --ignore-unmerged and possibly more. But since this
is a destructive operation, I don't see why we need to "force" anything
more. We already don't hold back.

When 'checkout --force' or 'restore --ignore-unmerged' is used, we may
also print warnings about unmerged entries being ignore. Since this is
not exactly warning (people tell us to do so), more informational, let
it be suppressed if --quiet is given. This is a behavior change for
git-checkout.

PS. The diff looks a bit iffy since --force is moved to
add_common_switch_branch_options() (i.e. for switching). But
git-checkout is also doing switching and inherits this --force.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/checkout.c | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/builtin/checkout.c b/builtin/checkout.c
index 09a03f1ff8..824ab65886 100644
--- a/builtin/checkout.c
+++ b/builtin/checkout.c
@@ -68,6 +68,8 @@ struct checkout_opts {
        int empty_pathspec_ok;
        int checkout_index;
        int checkout_worktree;
+       const char *ignore_unmerged_opt;
+       int ignore_unmerged;
 
        const char *new_branch;
        const char *new_branch_force;
@@ -409,8 +411,9 @@ static int checkout_paths(const struct checkout_opts *opts,
        if (opts->new_branch_log)
                die(_("'%s' cannot be used with updating paths"), "-l");
 
-       if (opts->force && opts->patch_mode)
-               die(_("'%s' cannot be used with updating paths"), "-f");
+       if (opts->ignore_unmerged && opts->patch_mode)
+               die(_("'%s' cannot be used with updating paths"),
+                   opts->ignore_unmerged_opt);
 
        if (opts->force_detach)
                die(_("'%s' cannot be used with updating paths"), "--detach");
@@ -418,8 +421,9 @@ static int checkout_paths(const struct checkout_opts *opts,
        if (opts->merge && opts->patch_mode)
                die(_("'%s' cannot be used with %s"), "--merge", "--patch");
 
-       if (opts->force && opts->merge)
-               die(_("'%s' cannot be used with %s"), "-f", "-m");
+       if (opts->ignore_unmerged && opts->merge)
+               die(_("'%s' cannot be used with %s"),
+                   opts->ignore_unmerged_opt, "-m");
 
        if (opts->new_branch)
                die(_("Cannot update paths and switch to branch '%s' at the 
same time."),
@@ -495,8 +499,9 @@ static int checkout_paths(const struct checkout_opts *opts,
                if (ce->ce_flags & CE_MATCHED) {
                        if (!ce_stage(ce))
                                continue;
-                       if (opts->force) {
-                               warning(_("path '%s' is unmerged"), ce->name);
+                       if (opts->ignore_unmerged) {
+                               if (!opts->quiet)
+                                       warning(_("path '%s' is unmerged"), 
ce->name);
                        } else if (opts->writeout_stage) {
                                errs |= check_stage(opts->writeout_stage, ce, 
pos, opts->overlay_mode);
                        } else if (opts->merge) {
@@ -1414,8 +1419,6 @@ static struct option *add_common_options(struct 
checkout_opts *opts,
                            "checkout", "control recursive updating of 
submodules",
                            PARSE_OPT_OPTARG, 
option_parse_recurse_submodules_worktree_updater },
                OPT_BOOL(0, "progress", &opts->show_progress, N_("force 
progress reporting")),
-               OPT__FORCE(&opts->force, N_("force checkout (throw away local 
modifications)"),
-                          PARSE_OPT_NOCOMPLETE),
                OPT_BOOL('m', "merge", &opts->merge, N_("perform a 3-way merge 
with the new branch")),
                OPT_STRING(0, "conflict", &opts->conflict_style, N_("style"),
                           N_("conflict style (merge or diff3)")),
@@ -1433,6 +1436,8 @@ static struct option *add_common_switch_branch_options(
                OPT_BOOL('d', "detach", &opts->force_detach, N_("detach HEAD at 
named commit")),
                OPT_SET_INT('t', "track",  &opts->track, N_("set upstream info 
for new branch"),
                        BRANCH_TRACK_EXPLICIT),
+               OPT__FORCE(&opts->force, N_("force checkout (throw away local 
modifications)"),
+                          PARSE_OPT_NOCOMPLETE),
                OPT_STRING(0, "orphan", &opts->new_orphan_branch, 
N_("new-branch"), N_("new unparented branch")),
                OPT_BOOL_F(0, "overwrite-ignore", &opts->overwrite_ignore,
                           N_("update ignored files (default)"),
@@ -1502,8 +1507,11 @@ static int checkout_main(int argc, const char **argv, 
const char *prefix,
                opts->merge = 1; /* implied */
                git_xmerge_config("merge.conflictstyle", opts->conflict_style, 
NULL);
        }
-       if (opts->force)
+       if (opts->force) {
                opts->discard_changes = 1;
+               opts->ignore_unmerged_opt = "--force";
+               opts->ignore_unmerged = 1;
+       }
 
        if ((!!opts->new_branch + !!opts->new_branch_force + 
!!opts->new_orphan_branch) > 1)
                die(_("-b, -B and --orphan are mutually exclusive"));
@@ -1750,6 +1758,8 @@ int cmd_restore(int argc, const char **argv, const char 
*prefix)
                           N_("restore the index")),
                OPT_BOOL('W', "worktree", &opts.checkout_worktree,
                           N_("restore the working tree (default)")),
+               OPT_BOOL(0, "ignore-unmerged", &opts.ignore_unmerged,
+                        N_("ignore unmerged entries")),
                OPT_BOOL(0, "overlay", &opts.overlay_mode, N_("use overlay 
mode")),
                OPT_END()
        };
@@ -1762,6 +1772,7 @@ int cmd_restore(int argc, const char **argv, const char 
*prefix)
        opts.overlay_mode = 0;
        opts.checkout_index = -1;    /* default off */
        opts.checkout_worktree = -2; /* default on */
+       opts.ignore_unmerged_opt = "--ignore-unmerged";
 
        options = parse_options_dup(restore_options);
        options = add_common_options(&opts, options);
-- 
2.21.0.854.ge34a79f761

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