[PATCH v2 0/9] built-in add -i: implement all commands in the main loop

Based on the js/builtin-add-i branch, this patch series implements the rest of the commands in git add -i's main loop: update, revert, add_untracked, patch, diff, and quit. Apart from quit, these commands are all very similar in that they first build a list of files, display it, let the user choose which ones to act on, and then perform the action.

Note that the patch command is not actually converted to C, not completely at least: the built-in version simply hands off to git add--interactive after letting the user select which files to act on.

The reason for this omission is practicality. Out of the 1,800+ lines of git-add--interactive.perl, over a thousand deal just with the git add -p part. I did convert that functionality already (to be contributed in a separate patch series, see https://github.com/gitgitgadget/git/pull/173), discovering that there is so little overlap between the git add --patch part and the rest of git add --interactive that I could put the former into a totally different file: add-patch.c.

Changes since v1:

 * As an introductory commit, we now release the pathspecs that we passed to
   the diff machinery.
 * The ternary in 1/8 (now 1/9) was adjusted from i ? to (i == 0) ? to make
   the flow more intuitive.
 * The commit message of 2/8 (now 3/9) no longer talks about an upgrade 
   command (which never existed)but about the update command (that I
   actually meant).

Johannes Schindelin (9):
  add-interactive: make sure to release `rev.prune_data`
  built-in add -i: allow filtering the modified files list
  built-in add -i: prepare for multi-selection commands
  built-in add -i: implement the `update` command
  built-in add -i: re-implement `revert` in C
  built-in add -i: re-implement `add-untracked` in C
  built-in add -i: implement the `patch` command
  built-in add -i: re-implement the `diff` command
  built-in add -i: offer the `quit` command

 add-interactive.c | 619 +++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 560 insertions(+), 59 deletions(-)

base-commit: 8c159044625e46de67cd8467f07424f38eb8301e
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-171%2Fdscho%2Fadd-i-in-c-all-except-patch-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-171/dscho/add-i-in-c-all-except-patch-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/171

Range-diff vs v1:

  -:  ---------- >  1:  1e02bf2d63 add-interactive: make sure to release `rev.prune_data`
  1:  1844c4d55e !  2:  fab098d86e built-in add -i: allow filtering the modified files list
     @@ -17,12 +17,21 @@
          and `diff-files` phases, and then skipping files in the second phase
          when they have not been seen in the first phase.
      
     +    Seeing as we change the meaning of the `phase` field, we rename it to
     +    `mode` to reflect that the order depends on the exact invocation of the
     +    `git add -i` command.
     +
          Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
      
       diff --git a/add-interactive.c b/add-interactive.c
       --- a/add-interactive.c
       +++ b/add-interactive.c
      @@
     + }
     + 
     + struct collection_status {
     +-	enum { FROM_WORKTREE = 0, FROM_INDEX = 1 } phase;
     ++	enum { FROM_WORKTREE = 0, FROM_INDEX = 1 } mode;
       
       	const char *reference;
       
     @@ -40,6 +49,15 @@
       			add_file_item(s->files, name);
       
       			entry = xcalloc(sizeof(*entry), 1);
     +@@
     + 		}
     + 
     + 		file_item = entry->item;
     +-		adddel = s->phase == FROM_INDEX ?
     ++		adddel = s->mode == FROM_INDEX ?
     + 			&file_item->index : &file_item->worktree;
     + 		adddel->seen = 1;
     + 		adddel->add = stat.files[i]->added;
      @@
       	free_diffstat_info(&stat);
       }
     @@ -59,7 +77,8 @@
       	struct object_id head_oid;
       	int is_initial = !resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
       					     &head_oid, NULL);
     - 	struct collection_status s = { FROM_WORKTREE };
     +-	struct collection_status s = { FROM_WORKTREE };
     ++	struct collection_status s = { 0 };
      +	int i;
       
       	if (discard_index(r->index) < 0 ||
     @@ -74,14 +93,23 @@
       		struct setup_revision_opt opt = { 0 };
       
      +		if (filter == INDEX_ONLY)
     -+			s.phase = i ? FROM_WORKTREE : FROM_INDEX;
     ++			s.mode = (i == 0) ? FROM_INDEX : FROM_WORKTREE;
      +		else
     -+			s.phase = i ? FROM_INDEX : FROM_WORKTREE;
     ++			s.mode = (i == 0) ? FROM_WORKTREE : FROM_INDEX;
      +		s.skip_unseen = filter && i;
      +
       		opt.def = is_initial ?
       			empty_tree_oid_hex() : oid_to_hex(&head_oid);
       
     +@@
     + 		if (ps)
     + 			copy_pathspec(&rev.prune_data, ps);
     + 
     +-		if (s.phase == FROM_INDEX)
     ++		if (s.mode == FROM_INDEX)
     + 			run_diff_index(&rev, 1);
     + 		else {
     + 			rev.diffopt.flags.ignore_dirty_submodules = 1;
      @@
       static int run_status(struct add_i_state *s, const struct pathspec *ps,
       		      struct string_list *files, struct list_options *opts)
  2:  c324b47592 !  3:  58a581f4ee built-in add -i: prepare for multi-selection commands
     @@ -2,7 +2,7 @@
      
          built-in add -i: prepare for multi-selection commands
      
     -    The `upgrade`, `revert` and `add-untracked` commands allow selecting
     +    The `update`, `revert` and `add-untracked` commands allow selecting
          multiple entries. Let's extend the `list_and_choose()` function to
          accommodate those use cases.
      
     @@ -168,7 +168,8 @@
      +				}
       			}
       
     - 			p[sep] = '\0';
     + 			if (p[sep])
     + 				p[sep++] = '\0';
      -			if (index < 0)
      -				index = find_unique(p, items);
      +			if (from < 0) {
     @@ -199,7 +200,7 @@
      +					res += choose ? +1 : -1;
      +				}
      +
     - 			p += sep + 1;
     + 			p += sep;
       		}
       
      -		if (res != LIST_AND_CHOOSE_ERROR)
  3:  cba5f13152 =  4:  c311a29c77 built-in add -i: implement the `update` command
  4:  5c31bbd24a =  5:  f70723a160 built-in add -i: re-implement `revert` in C
  5:  5c498795b3 =  6:  952fbc8f79 built-in add -i: re-implement `add-untracked` in C
  6:  0c8a71e2e8 !  7:  cbd10da523 built-in add -i: implement the `patch` command
     @@ -51,9 +51,9 @@
       						    struct pathname_entry, ent);
      @@
       		file_item = entry->item;
     - 		adddel = s->phase == FROM_INDEX ?
     + 		adddel = s->mode == FROM_INDEX ?
       			&file_item->index : &file_item->worktree;
     -+		other_adddel = s->phase == FROM_INDEX ?
     ++		other_adddel = s->mode == FROM_INDEX ?
      +			&file_item->worktree : &file_item->index;
       		adddel->seen = 1;
       		adddel->add = stat.files[i]->added;
     @@ -84,7 +84,7 @@
       	struct object_id head_oid;
       	int is_initial = !resolve_ref_unsafe("HEAD", RESOLVE_REF_READING,
      @@
     - 		}
     + 			clear_pathspec(&rev.prune_data);
       	}
       	hashmap_free_entries(&s.file_map, struct pathname_entry, ent);
      +	if (unmerged_count)
  7:  499f3f19e0 =  8:  e4907112e4 built-in add -i: re-implement the `diff` command
  8:  dbcb340ede =  9:  5ba6cd31ab built-in add -i: offer the `quit` command