[PATCHv10 4/4] status: better advices when splitting a commit (during rebase -i)

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Add new informative help messages at the output of 'git status' when
the user is splitting a commit. The code figures this state by
comparing the contents of the following files in the .git/ directory:
	  - HEAD
	  - ORIG_HEAD
	  - rebase-merge/amend
	  - rebase-merge/orig-head

Signed-off-by: Lucien Kong <Lucien.Kong@xxxxxxxxxxxxxxx>
Signed-off-by: Valentin Duperray <Valentin.Duperray@xxxxxxxxxxxxxxx>
Signed-off-by: Franck Jonas <Franck.Jonas@xxxxxxxxxxxxxxx>
Signed-off-by: Thomas Nguy <Thomas.Nguy@xxxxxxxxxxxxxxx>
Signed-off-by: Huynh Khoi Nguyen Nguyen <Huynh-Khoi-Nguyen.Nguyen@xxxxxxxxxxxxxxx>
Signed-off-by: Matthieu Moy <Matthieu.Moy@xxxxxxxxxxxxxxx>
---
The "const" have been dropped and the check about "HEAD" been
detached or not is fixed.

 t/t7512-status-help.sh |  277 ++++++++++++++++++++++++++++++++++++++++++++++++
 wt-status.c            |   51 +++++++++
 2 files changed, 328 insertions(+), 0 deletions(-)

diff --git a/t/t7512-status-help.sh b/t/t7512-status-help.sh
index bdce192..3ce384a 100755
--- a/t/t7512-status-help.sh
+++ b/t/t7512-status-help.sh
@@ -196,6 +196,283 @@ test_expect_success 'status when rebasing -i in edit mode' '
 '
 
 
+test_expect_success 'status when splitting a commit' '
+	git reset --hard master &&
+	git checkout -b split_commit &&
+	test_commit one_split main.txt one &&
+	test_commit two_split main.txt two &&
+	test_commit three_split main.txt three &&
+	test_commit four_split main.txt four &&
+	FAKE_LINES="1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git reset HEAD^ &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently splitting a commit.
+	#   (Once your working directory is clean, run "git rebase --continue")
+	#
+	# Changes not staged for commit:
+	#   (use "git add <file>..." to update what will be committed)
+	#   (use "git checkout -- <file>..." to discard changes in working directory)
+	#
+	#	modified:   main.txt
+	#
+	no changes added to commit (use "git add" and/or "git commit -a")
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status after editing the last commit with --amend during a rebase -i' '
+	git reset --hard master &&
+	git checkout -b amend_last &&
+	test_commit one_amend main.txt one &&
+	test_commit two_amend main.txt two &&
+	test_commit three_amend main.txt three &&
+	test_commit four_amend main.txt four &&
+	FAKE_LINES="1 2 edit 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git commit --amend -m "foo" &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'prepare for several edits' '
+	git reset --hard master &&
+	git checkout -b several_edits &&
+	test_commit one_edits main.txt one &&
+	test_commit two_edits main.txt two &&
+	test_commit three_edits main.txt three &&
+	test_commit four_edits main.txt four
+'
+
+
+test_expect_success 'status: (continue first edit) second edit' '
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git rebase --continue &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (continue first edit) second edit and split' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git rebase --continue &&
+	git reset HEAD^ &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently splitting a commit.
+	#   (Once your working directory is clean, run "git rebase --continue")
+	#
+	# Changes not staged for commit:
+	#   (use "git add <file>..." to update what will be committed)
+	#   (use "git checkout -- <file>..." to discard changes in working directory)
+	#
+	#	modified:   main.txt
+	#
+	no changes added to commit (use "git add" and/or "git commit -a")
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (continue first edit) second edit and amend' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git rebase --continue &&
+	git commit --amend -m "foo" &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (amend first edit) second edit' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git commit --amend -m "a" &&
+	git rebase --continue &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (amend first edit) second edit and split' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git commit --amend -m "b" &&
+	git rebase --continue &&
+	git reset HEAD^ &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently splitting a commit.
+	#   (Once your working directory is clean, run "git rebase --continue")
+	#
+	# Changes not staged for commit:
+	#   (use "git add <file>..." to update what will be committed)
+	#   (use "git checkout -- <file>..." to discard changes in working directory)
+	#
+	#	modified:   main.txt
+	#
+	no changes added to commit (use "git add" and/or "git commit -a")
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (amend first edit) second edit and amend' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git commit --amend -m "c" &&
+	git rebase --continue &&
+	git commit --amend -m "d" &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (split first edit) second edit' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git reset HEAD^ &&
+	git add main.txt &&
+	git commit -m "e" &&
+	git rebase --continue &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (split first edit) second edit and split' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git reset HEAD^ &&
+	git add main.txt &&
+	git commit --amend -m "f" &&
+	git rebase --continue &&
+	git reset HEAD^ &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently splitting a commit.
+	#   (Once your working directory is clean, run "git rebase --continue")
+	#
+	# Changes not staged for commit:
+	#   (use "git add <file>..." to update what will be committed)
+	#   (use "git checkout -- <file>..." to discard changes in working directory)
+	#
+	#	modified:   main.txt
+	#
+	no changes added to commit (use "git add" and/or "git commit -a")
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
+test_expect_success 'status: (split first edit) second edit and amend' '
+	git reset --hard several_edits &&
+	FAKE_LINES="edit 1 edit 2 3" &&
+	export FAKE_LINES &&
+	test_when_finished "git rebase --abort" &&
+	git rebase -i HEAD~3 &&
+	git reset HEAD^ &&
+	git add main.txt &&
+	git commit --amend -m "g" &&
+	git rebase --continue &&
+	git commit --amend -m "h" &&
+	cat >expected <<-\EOF &&
+	# Not currently on any branch.
+	# You are currently editing a commit during a rebase.
+	#   (use "git commit --amend" to amend the current commit)
+	#   (use "git rebase --continue" once you are satisfied with your changes)
+	#
+	nothing to commit (use -u to show untracked files)
+	EOF
+	git status --untracked-files=no >actual &&
+	test_i18ncmp expected actual
+'
+
+
 test_expect_success 'prepare am_session' '
 	git reset --hard master &&
 	git checkout -b am_session &&
diff --git a/wt-status.c b/wt-status.c
index fcde045..5496a1f 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -12,6 +12,7 @@
 #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 */
@@ -817,6 +818,51 @@ static void show_am_in_progress(struct wt_status *s,
 	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 || !prefixcmp(head, "ref: "))
+		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)
@@ -838,6 +884,11 @@ static void show_rebase_in_progress(struct wt_status *s,
 		if (advice_status_hints)
 			status_printf_ln(s, color,
 				_("  (all conflicts fixed: run \"git rebase --continue\")"));
+	} else if (split_commit_in_progress(s)) {
+		status_printf_ln(s, color, _("You are currently splitting a commit."));
+		if (advice_status_hints)
+			status_printf_ln(s, color,
+				_("  (Once your working directory is clean, run \"git rebase --continue\")"));
 	} else {
 		status_printf_ln(s, color, _("You are currently editing a commit during a rebase."));
 		if (advice_status_hints && !s->amend) {
-- 
1.7.8

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