In this commit, we pass `--progress` to the `format-patch` command if
stderr is connected to an interactive terminal, unless we're in quiet
mode.

This `--progress` option will be used in `format-patch` to show progress
reports on stderr as patches are generated.

Signed-off-by: Pratik Karki <predatoram...@gmail.com>
---
 builtin/rebase.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 1bb64e7cd7..04974dff6e 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -98,6 +98,7 @@ struct rebase_options {
        int allow_empty_message;
        int rebase_merges, rebase_cousins;
        char *strategy, *strategy_opts;
+       struct strbuf git_format_patch_opt;
 };
 
 static int is_interactive(struct rebase_options *opts)
@@ -379,6 +380,8 @@ static int run_specific_rebase(struct rebase_options *opts)
        add_var(&script_snippet, "rebase_root", opts->root ? "t" : "");
        add_var(&script_snippet, "squash_onto",
                opts->squash_onto ? oid_to_hex(opts->squash_onto) : "");
+       add_var(&script_snippet, "git_format_patch_opt",
+               opts->git_format_patch_opt.buf);
 
        switch (opts->type) {
        case REBASE_AM:
@@ -667,6 +670,7 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
                .git_am_opt = STRBUF_INIT,
                .allow_rerere_autoupdate  = -1,
                .allow_empty_message = 1,
+               .git_format_patch_opt = STRBUF_INIT,
        };
        const char *branch_name;
        int ret, flags, total_argc, in_progress = 0;
@@ -1068,6 +1072,9 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
        if (options.root && !options.onto_name)
                imply_interactive(&options, "--root without --onto");
 
+       if (isatty(2) && options.flags & REBASE_NO_QUIET)
+               strbuf_addstr(&options.git_format_patch_opt, " --progress");
+
        switch (options.type) {
        case REBASE_MERGE:
        case REBASE_INTERACTIVE:
-- 
2.18.0

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