syntax = "proto3";

package gitaly;

import "lint.proto";
import "shared.proto";

option go_package = "gitlab.com/gitlab-org/gitaly/v16/proto/go/gitalypb";

// DiffService is a service which provides RPCs to inspect differences
// introduced between a set of commits.
service DiffService {

  // CommitDiff returns a diff between two different commits. The patch data is
  // chunked across messages and get streamed back to the client.
  rpc CommitDiff(CommitDiffRequest) returns (stream CommitDiffResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }

  // CommitDelta returns the deltas between two different commits. A delta
  // includes everything that changed about a set of paths except for the actual
  // diff.
  rpc CommitDelta(CommitDeltaRequest) returns (stream CommitDeltaResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }

  // RawDiff returns a diff between two commits. The output is the unmodified
  // output from git-diff(1). This is not to be confused with git-diff(1)'s
  // --raw mode.
  rpc RawDiff(RawDiffRequest) returns (stream RawDiffResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }

  // RawPatch returns a diff between two commits in a formatted patch.The output
  // is the unmodified output from git-format-patch(1). This is not to be confused with
  // git-diff(1)'s --raw mode.
  rpc RawPatch(RawPatchRequest) returns (stream RawPatchResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }

  // DiffStats returns the diff stats between two commits such as number of lines
  // changed, etc.
  rpc DiffStats(DiffStatsRequest) returns (stream DiffStatsResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }

  // FindChangedPaths returns a list of files changed along with the status of each file
  rpc FindChangedPaths(FindChangedPathsRequest) returns (stream FindChangedPathsResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }

  // GetPatchID computes a patch ID for a patch. Patch IDs are a unique ID computed by hashing
  // a patch with some parameters like line numbers ignored. The patch ID can thus be used to compare
  // whether diffs make the same change. Please refer to git-patch-id(1) for further information.
  // If the difference between old and new change is empty then this RPC returns an error.
  rpc GetPatchID(GetPatchIDRequest) returns (GetPatchIDResponse) {
    option (op_type) = {
      op: ACCESSOR
    };
  }
}

// CommitDiffRequest is a request for the CommitDiff RPC.
message CommitDiffRequest {
  // DiffMode determines the type of diff that will be returned.
  enum DiffMode {
    // DEFAULT is the standard diff mode and results in a linewise diff for textfiles.
    DEFAULT = 0; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
    // WORDDIFF is a word diff and computes the diff for whitespace separated words instead of for whole lines.
    WORDDIFF = 1; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX
  }

  // WhitespaceChanges states which whitespace changes we should ignore. These options correlate to
  // the ones present in git-diff(1).
  enum WhitespaceChanges {
    // WHITESPACE_CHANGES_UNSPECIFIED is used to not ignore any whitespace changes.
    WHITESPACE_CHANGES_UNSPECIFIED = 0;
    // WHITESPACE_CHANGES_IGNORE specifies to use the `--ignore-space-change` flag of git-diff(1).
    // Only changes in amount of whitespace are ignored.
    WHITESPACE_CHANGES_IGNORE = 1;
    // WHITESPACE_CHANGES_IGNORE_ALL specifies to use the `--ignore-all-space` flag of git-diff(1).
    // all whitespace characters are ignored when comparing lines.
    WHITESPACE_CHANGES_IGNORE_ALL = 2;
  }

  // repository is the one from which to get the diff.
  Repository repository = 1 [(target_repository)=true];
  // left_commit_id is the left commit ID in <left commit>..<right commit>.
  string left_commit_id = 2;
  // right_commit_id is the right commit ID in <left commit>..<right commit>.
  string right_commit_id = 3;
  // This field is deprecated, use the `whitespace_changes` field instead.
  reserved "ignore_whitespace_change";
  reserved 4;

  // paths is a list of paths that limits the diff to those specific paths.
  repeated bytes paths = 5;
  // collapse_diffs causes patches to be emptied after safe_max_files,
  // safe_max_files, or safe_max_lines is reached.
  bool collapse_diffs = 6;
  // enforce_limits causes parsing of diffs to stop if max_files, max_lines,
  // or max_bytes is reached.
  bool enforce_limits = 7;
  // max_files is the maximum number of files in a diff. Once reached, parsing is stopped
  // if enforce_limits is true.
  int32 max_files = 8;
  // max_lines is the maximum number of lines in a diff. Once reached, parsing is stopped
  // if enforce_limits is true.
  int32 max_lines = 9;
  // max_bytes is the maximum number of bytes in a diff. Once reached, parsing is stopped
  // if enforce_limits is true.
  int32 max_bytes = 10;
  // max_patch_bytes is the limitation of a single diff patch,
  // patches surpassing this limit are pruned by default.
  // If this is 0 you will get back empty patches.
  int32 max_patch_bytes = 14;

  // safe_max_files is the maximum number of files in a diff. Once reached, patches are emptied if
  // collapse_diffs is true.
  int32 safe_max_files = 11;
  // safe_max_lines is the maximum number of lines in a diff. Once reached, patches are emptied if
  // collapse_diffs is true.
  int32 safe_max_lines = 12;
  // safe_max_bytes is the maximum number of bytes in a diff. Once reached, patches are emptied if
  // collapse_diffs is true.
  int32 safe_max_bytes = 13;

  // diff_mode is the mode used for generating the diff. Please refer to the enum declaration for supported modes.
  DiffMode diff_mode = 15;

  // max_patch_bytes_for_file_extension is a map of file extension to max patch bytes for
  // that extension. It overrides max patch bytes for file extension. If the file does not
  // have an extension (eg Dockerfile), then the file name is used for matching.
  // For files with more than on extension (eg file.html.tmpl) only the last extension is matched.
  map<string, int32> max_patch_bytes_for_file_extension = 16;

  // whitespace_changes states which whitespace changes should be included in the diff.
  // Please refer to the enum declaration for supported modes.
  WhitespaceChanges whitespace_changes = 17;

  // collect_all_paths can be set when you want to get back all files,
  // even when the enforced limits are hit. Responses sent when the limits
  // were hit will have the path filled in, have the `overflow_marker` set,
  // but have no patch data.
  bool collect_all_paths = 18;
}

// CommitDiffResponse corresponds to a single changed file in a commit.
message CommitDiffResponse {
  reserved 8;

  // from_path is the path that to_path is getting compared to.
  bytes from_path = 1;
  // to_path is the path that from_path is getting compared against.
  bytes to_path = 2;
  // from_id is the id of the blob that is getting compared against.
  string from_id = 3;
  // to_id is the id of the blob that is getting compared to.
  string to_id = 4;
  // old_mode is the mode of the file getting compared against.
  int32 old_mode = 5;
  // new_mode is the mode of the file getting compared to.
  int32 new_mode = 6;
  // binary indicates whether or not binary data is getting compared.
  bool binary = 7;
  // raw_patch_data is the unparsed data of the diff.
  bytes raw_patch_data = 9;
  // end_of_patch indicates if this message represents the end of the diff.
  bool end_of_patch = 10;
  // overflow_marker Indicates if the diff file exceeded limitations, in which case
  // there will be no patch data sent, only information about the patch.
  bool overflow_marker = 11;
  // collapsed indicates the patch surpassed a "safe" limit and was therefore pruned, but
  // the client may still request the full patch on a separate request.
  bool collapsed = 12;
  // too_large indicates the patch was pruned since it surpassed a hard limit, and can
  // therefore not be expanded.
  bool too_large = 13;
}

// CommitDeltaRequest is a request for the CommitDelta RPC.
message CommitDeltaRequest {
  // repository is the one to get the commit deltas from.
  Repository repository = 1 [(target_repository)=true];
  // left_commit_id is the left commit ID in <left commit>..<right commit>.
  string left_commit_id = 2;
  // right_commit_id is the right commit ID in <left commit>..<right commit>.
  string right_commit_id = 3;
  // paths is a list of paths that limits the diff to those specific paths.
  repeated bytes paths = 4;
}

// CommitDelta represents the metadata of a diff between two commits without the actual
// patch data.
message CommitDelta {
  // from_path is the path that to_path is getting compared to.
  bytes from_path = 1;
  // to_path is the path that from_path is getting compared against.
  bytes to_path = 2;
  // from_id is the id of the blob that is getting compared to.
  string from_id = 3;
  // to_id is the id of the blob that is getting compared against.
  string to_id = 4;
  // old_mode is the mode of the blob getting compared against.
  int32 old_mode = 5;
  // new_mode is the mode of the blob getting compared to.
  int32 new_mode = 6;
}

// CommitDeltaResponse is the response from a CommitDelta RPC call.
message CommitDeltaResponse {
  // deltas is a list of CommitDeltas
  repeated CommitDelta deltas = 1;
}

// RawDiffRequest is a request for the RawDiff RPC.
message RawDiffRequest {
  // repository is the one to get the diff from.
  Repository repository = 1 [(target_repository)=true];
  // left_commit_id is the left commit ID in <left commit>..<right commit>.
  string left_commit_id = 2;
  // right_commit_id is the right commit ID in <left commit>..<right commit>.
  string right_commit_id = 3;
}

// RawDiffResponse is a response for the RawDiff RPC.
message RawDiffResponse {
  // data is a sequence of bytes representing the unmodified diff patch data
  // returned from git-diff(1).
  bytes data = 1;
}

// RawPatchRequest is a response for the RawPatch RPC.
message RawPatchRequest {
  // repository is the one to get the patch from.
  Repository repository = 1 [(target_repository)=true];
  // left_commit_id is the left commit ID in <left commit>..<right commit>.
  string left_commit_id = 2;
  // right_commit_id is the right commit ID in <left commit>..<right commit>
  string right_commit_id = 3;
}

// RawPatchResponse is a response for the RawPatch RPC.
message RawPatchResponse {
  // data is a sequence of bytes representing the unmodified diff patch data
  // returned from git-format-patch(1).
  bytes data = 1;
}

// DiffStatsRequest is a request for the DiffStats RPC.
message DiffStatsRequest {
  // repository is the one to get diff stats from.
  Repository repository = 1 [(target_repository)=true];
  // left_commit_id is the left commit ID in <left commit>..<right commit>
  string left_commit_id = 2;
  // right_commit_id is the right commit ID in <left commit>..<right commit>
  string right_commit_id = 3;
}

// DiffStats represents diff statistics for a path.
message DiffStats {
  // path is the path of the change.
  bytes path = 1;
  // additions is the number of additions in a diff.
  int32 additions = 2;
  // deletions is the number of deletions in a diff.
  int32 deletions = 3; 
  // old_path is the original path in the event of a rename.
  bytes old_path = 4;
}

// DiffStatsResponse is a response for the DiffStats RPC.
message DiffStatsResponse {
  // stats is a list of DiffStats.
  repeated DiffStats stats = 1;
}

// FindChangedPathsRequest is the request for the FindChangedPaths RPC.
// Given a list of commits, return the files changed. Each commit is compared
// to its parent. Merge commits will show files which are different to all of
// its parents.
message FindChangedPathsRequest {
  // MergeCommitDiffMode controls which mode to use to produce diff output for merge commits
  enum MergeCommitDiffMode {
    // MERGE_COMMIT_DIFF_MODE_UNSPECIFIED is the default value.
    // It is equivalent to DIFF_MODE_INCLUDE_MERGES.
    MERGE_COMMIT_DIFF_MODE_UNSPECIFIED = 0;
    // MERGE_COMMIT_DIFF_MODE_INCLUDE_MERGES tells git to also show differences for merge commits.
    // Please refer to the documentation of the `-m` flag of git-diff-tree(1).
    MERGE_COMMIT_DIFF_MODE_INCLUDE_MERGES = 1;
    // MERGE_COMMIT_DIFF_MODE_ALL_PARENTS tells git to only show differences for
    // files which were modified from all parents.
    // Please refer to the documentation of the `-c` flag of git-diff-tree(1).
    MERGE_COMMIT_DIFF_MODE_ALL_PARENTS = 2;
  }

  // Request is a single request to pass to git diff-tree.
  message Request {
    // TreeRequest compares two trees.
    message TreeRequest {
      // left_tree_revision is the revision of the left tree to compare. Accepts any revision that
      // peels to a tree object.
      string left_tree_revision = 1;
      // right_tree_revision is the revision of the right tree to compare. Accepts any revision that
      // peels to a tree object.
      string right_tree_revision = 2;
    }

    // CommitRequest compares a commit to its parents (or some other commits.)
    message CommitRequest {
      // commit_revision is the revision of the commit that should be compared. If no `parent_commit_revisions`
      // are given, then the commit will be compared against its parents. The revision needs to peel to a
      // commit object.
      string commit_revision = 1;
      // parent_commit_revisions are the revisions of commits to treat as the commit's parents. This is an
      // optional field: if not specified, the actual parents of the commit referred to by `commit_revision`
      // are used.
      repeated string parent_commit_revisions = 2;
    }

    oneof type {
      // tree_request is a request comparing two trees with each other.
      TreeRequest tree_request = 1;
      // commit_request is a request comparing one or more commits with each other.
      CommitRequest commit_request = 2;
    }
  }

  // repository ...
  Repository repository = 1 [(target_repository)=true];
  // commits is the list of commits to compare to their parents. This field is deprecated. To adapt to the new calling
  // convention you can create one `CommitRequest` per commit, where each `CommitRequest` has only the `commit_revision`
  // field.
  repeated string commits = 2 [deprecated=true];
  // requests specifies the requests of what to compare.
  repeated Request requests = 3;

  // merge_commit_diff_mode controls how merge commits are treated.
  MergeCommitDiffMode merge_commit_diff_mode = 4;
}

// FindChangedPathsResponse is the response for the FindChangedPaths RPC.
// Returns a list of files that have been changed in the commits given.
message FindChangedPathsResponse {
  // paths contains the attributes for one changed file. In case of merge
  // commits, or when comparing three or more commits, a file might be included
  // more than once if it was changed between multiple commits.
  repeated ChangedPaths paths = 1;
}

// ChangedPaths contains information about a changed file. It includes the path
// of the file, and the status of the change.
message ChangedPaths {
  // Status is an enum representing the type of change.
  enum Status {
    // ADDED indicates a file was added.
    ADDED = 0; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX ENUM_FIELD_NAMES_ZERO_VALUE_END_WITH
    // MODIFIED indicates a file was modified.
    MODIFIED = 1; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX
    // DELETED indicates a file was deleted.
    DELETED = 2; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX
    // TYPE_CHANGE ...
    TYPE_CHANGE = 3; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX
    // COPIED ...
    COPIED = 4; // protolint:disable:this ENUM_FIELD_NAMES_PREFIX
  }

  // path is the path of the change in question.
  bytes path = 1;
  // status is the type of change.
  Status status = 2;
  // old_mode is the mode of the changed path previous to the change. May be one of the following values:
  //
  //   - 0o000000 if the path does not exist.
  //   - 0o100644 if the path refers to a normal file.
  //   - 0o100755 if the path refers to an executable file.
  //   - 0o040000 if the path refers to a tree entry.
  //   - 0o160000 if the path refers to a submodule.
  int32 old_mode = 3;
  // new_mode is the mode of the changed path after the change. Please refer to `old_mode` for a list of potential values.
  int32 new_mode = 4;
}

// GetPatchIDRequest is a request for the GetPatchID RPC.
message GetPatchIDRequest {
  // repository is the repository the patch ID shall be computed in.
  Repository repository = 1 [(target_repository)=true];
  // old_revision is the old revision that shall be used to compute the patch
  // from that will then be passed to git-patch-id(1). Accepts revisions as
  // specified in gitrevisions(5).
  bytes old_revision = 2;
  // new_revision is the new revision that shall be used to compute the patch
  // from that will then be passed to git-patch-id(1). Accepts revisions as
  // specified in gitrevisions(5).
  bytes new_revision = 3;
}

// GetPatchIDResponse is a response for the GetPatchID RPC.
message GetPatchIDResponse {
  // patch_id is the patch ID that was generated by hashing the diff of the
  // given old and new revision.
  string patch_id = 1;
}