[PATCH v2 05/11] builtin rebase: support the `verbose` and `diffstat` options

[Pratik Karki via GitGitGadget]

From: Pratik Karki <predatoram...@gmail.com>

This commit introduces support for the `-v` and `--stat` options of
rebase.

The --stat option can also be configured via the Git config setting
rebase.stat. To support this, we also add a custom rebase_config()
function in this commit that will be used instead of (and falls back to
calling) git_default_config().

Signed-off-by: Pratik Karki <predatoram...@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schinde...@gmx.de>
---
 builtin/rebase.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 58 insertions(+), 2 deletions(-)

diff --git a/builtin/rebase.c b/builtin/rebase.c
index 19fa4d3fc4..2d3f1d65fb 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -18,6 +18,7 @@
 #include "lockfile.h"
 #include "parse-options.h"
 #include "commit.h"
+#include "diff.h"
 
 static char const * const builtin_rebase_usage[] = {
        N_("git rebase [-i] [options] [--exec <cmd>] [--onto <newbase>] "
@@ -81,6 +82,8 @@ struct rebase_options {
        int dont_finish_rebase;
        enum {
                REBASE_NO_QUIET = 1<<0,
+               REBASE_VERBOSE = 1<<1,
+               REBASE_DIFFSTAT = 1<<2,
        } flags;
        struct strbuf git_am_opt;
 };
@@ -166,6 +169,10 @@ static int run_specific_rebase(struct rebase_options *opts)
        add_var(&script_snippet, "GIT_QUIET",
                opts->flags & REBASE_NO_QUIET ? "" : "t");
        add_var(&script_snippet, "git_am_opt", opts->git_am_opt.buf);
+       add_var(&script_snippet, "verbose",
+               opts->flags & REBASE_VERBOSE ? "t" : "");
+       add_var(&script_snippet, "diffstat",
+               opts->flags & REBASE_DIFFSTAT ? "t" : "");
 
        switch (opts->type) {
        case REBASE_AM:
@@ -311,6 +318,21 @@ static int reset_head(struct object_id *oid, const char 
*action,
        return ret;
 }
 
+static int rebase_config(const char *var, const char *value, void *data)
+{
+       struct rebase_options *opts = data;
+
+       if (!strcmp(var, "rebase.stat")) {
+               if (git_config_bool(var, value))
+                       opts->flags |= REBASE_DIFFSTAT;
+               else
+                       opts->flags &= !REBASE_DIFFSTAT;
+               return 0;
+       }
+
+       return git_default_config(var, value, data);
+}
+
 int cmd_rebase(int argc, const char **argv, const char *prefix)
 {
        struct rebase_options options = {
@@ -332,7 +354,13 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
                         N_("allow pre-rebase hook to run")),
                OPT_NEGBIT('q', "quiet", &options.flags,
                           N_("be quiet. implies --no-stat"),
-                          REBASE_NO_QUIET),
+                          REBASE_NO_QUIET| REBASE_VERBOSE | REBASE_DIFFSTAT),
+               OPT_BIT('v', "verbose", &options.flags,
+                       N_("display a diffstat of what changed upstream"),
+                       REBASE_NO_QUIET | REBASE_VERBOSE | REBASE_DIFFSTAT),
+               {OPTION_NEGBIT, 'n', "no-stat", &options.flags, NULL,
+                       N_("do not show diffstat of what changed upstream"),
+                       PARSE_OPT_NOARG, NULL, REBASE_DIFFSTAT },
                OPT_END(),
        };
 
@@ -360,7 +388,8 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
        trace_repo_setup(prefix);
        setup_work_tree();
 
-       git_config(git_default_config, NULL);
+       git_config(rebase_config, &options);
+
        argc = parse_options(argc, argv, prefix,
                             builtin_rebase_options,
                             builtin_rebase_usage, 0);
@@ -456,6 +485,33 @@ int cmd_rebase(int argc, const char **argv, const char 
*prefix)
                        argc ? argv[0] : NULL, NULL))
                die(_("The pre-rebase hook refused to rebase."));
 
+       if (options.flags & REBASE_DIFFSTAT) {
+               struct diff_options opts;
+
+               if (options.flags & REBASE_VERBOSE)
+                       printf(_("Changes from %s to %s:\n"),
+                               oid_to_hex(&merge_base),
+                               oid_to_hex(&options.onto->object.oid));
+
+               /* We want color (if set), but no pager */
+               diff_setup(&opts);
+               opts.stat_width = -1; /* use full terminal width */
+               opts.stat_graph_width = -1; /* respect statGraphWidth config */
+               opts.output_format |=
+                       DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
+               opts.detect_rename = DIFF_DETECT_RENAME;
+               diff_setup_done(&opts);
+               diff_tree_oid(&merge_base, &options.onto->object.oid,
+                             "", &opts);
+               diffcore_std(&opts);
+               diff_flush(&opts);
+       }
+
+       /* Detach HEAD and reset the tree */
+       if (options.flags & REBASE_NO_QUIET)
+               printf(_("First, rewinding head to replay your work on top of "
+                        "it...\n"));
+
        strbuf_addf(&msg, "rebase: checkout %s", options.onto_name);
        if (reset_head(&options.onto->object.oid, "checkout", NULL, 1))
                die(_("Could not detach HEAD"));
-- 
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