[Libguestfs] [libnbd PATCH v2 4/4] generator: indent C argument list 2 spaces relative to function designator

Change the optional "parens" parameter of "print_arg_list" from bool to a new union type. The new union type has three data constructors, NoParens (matching the previous "false" value), ParensSameLine (matching the previous "true" value), and a third constructor called "ParensNewLineWithIndent", which wraps an "int". [ParensNewLineWithIndent n] stands for the following formatting construct (with wrapping): and without wrapping: Capture "n" (that is, the 0-based column where the function designator starts) in "print_call", and put the new formatting to use. In effect, still utilize "pr_wrap", for wrapping the argument list at comma (",") characters, but shift the left hand side of the wrapped block from the end of the function designator near the front of it. The use case is: if "foobar" is long, and at least one "typeN" is also long, previously we would get That is, the first wrapping opportunity on a particular line would be too late already, making the source code too wide. This patch changes the generated files "include/libnbd.h" and "lib/unlocked.h". Taking the declaration responsible for the longest line in each of those header files, the declaration is reformatted as shown below: [include/libnbd.h] [lib/unlocked.h] Update the GoLang generator to stick with "no parens". Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2172516 Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; --- Notes: v2: - rename "args_style" to "parens_style" [Rich] - rename ParensNewLine to ParensNewLineWithIndent [Rich] - use the "spaces" function for indentation [Rich] generator/C.mli | 3 ++- generator/C.ml | 25 +++++++++++++++----- generator/GoLang.ml | 4 ++-- 3 files changed, 23 insertions(+), 9 deletions(-) diff --git a/generator/C.mli b/generator/C.mli index 215acc64f8a9..bc93cf896c96 100644 --- a/generator/C.mli +++ b/generator/C.mli @@ -18,6 +18,7 @@ *) type closure_style = Direct | AddressOf | Pointer +type parens_style = NoParens | ParensSameLine | ParensNewLineWithIndent of int val generate_lib_libnbd_syms : unit -> unit val generate_include_libnbd_h : unit -> unit @@ -28,7 +29,7 @@ val val generate_docs_api_flag_links_pod : unit -> unit val generate_docs_nbd_pod : string -> API.call -> unit -> unit val print_arg_list : ?wrap:bool -> ?maxcol:int -> - ?handle:bool -> ?types:bool -> ?parens:bool -> + ?handle:bool -> ?types:bool -> ?parens:parens_style -> ?closure_style:closure_style -> API.arg list -> API.optarg list -> unit val print_cbarg_list : ?wrap:bool -> ?maxcol:int -> diff --git a/generator/C.ml b/generator/C.ml index 044c046dcff1..61ca43d95db5 100644 --- a/generator/C.ml +++ b/generator/C.ml @@ -23,6 +23,7 @@ open Utils type closure_style = Direct | AddressOf | Pointer +type parens_style = NoParens | ParensSameLine | ParensNewLineWithIndent of int let generate_lib_libnbd_syms () = generate_header HashStyle; @@ -134,15 +135,23 @@ let let optarg_attr_nonnull (OClosure _ | OFlags _) = [ false ] -let rec print_arg_list ?(wrap = false) ?maxcol ?handle ?types ?(parens = true) - ?closure_style args optargs = - if parens then pr "("; +let rec print_arg_list ?(wrap = false) ?maxcol ?handle ?types + ?(parens = ParensSameLine) ?closure_style args optargs = + (match parens with + | NoParens -> () + | ParensSameLine -> pr "(" + | ParensNewLineWithIndent indent -> pr "(\n%s" (spaces (indent + 2)) + ); if wrap then pr_wrap ?maxcol ',' (fun () -> print_arg_list' ?handle ?types ?closure_style args optargs) else print_arg_list' ?handle ?types ?closure_style args optargs; - if parens then pr ")" + (match parens with + | NoParens -> () + | ParensSameLine -> pr ")" + | ParensNewLineWithIndent indent -> pr "\n%s)" (spaces indent) + ) and print_arg_list' ?(handle = false) ?(types = true) ?(closure_style = Direct) args optargs = @@ -237,8 +246,12 @@ and ) optargs let print_call ?wrap ?maxcol ?closure_style name args optargs ret = - pr "%s nbd_%s " (type_of_ret ret) name; - print_arg_list ~handle:true ?wrap ?maxcol ?closure_style args optargs + pr "%s " (type_of_ret ret); + let designator_column = output_column () in + pr "nbd_%s " name; + print_arg_list ~handle:true ?wrap ?maxcol + ~parens:(ParensNewLineWithIndent designator_column) ?closure_style args + optargs let print_fndecl ?wrap ?closure_style name args optargs ret = pr "extern "; diff --git a/generator/GoLang.ml b/generator/GoLang.ml index 3120b7f7c72f..4ab6b2626ae3 100644 --- a/generator/GoLang.ml +++ b/generator/GoLang.ml @@ -135,7 +135,7 @@ let pr "%s\n" ret_c_type; pr "_nbd_%s_wrapper (struct error *err,\n" name; pr " "; - C.print_arg_list ~wrap:true ~handle:true ~parens:false args optargs; + C.print_arg_list ~wrap:true ~handle:true ~parens:NoParens args optargs; pr ")\n"; pr "{\n"; pr "#ifdef LIBNBD_HAVE_NBD_%s\n" ucname; @@ -736,7 +736,7 @@ let let ret_c_type = C.type_of_ret ret in pr "%s _nbd_%s_wrapper (struct error *err,\n" ret_c_type name; pr " "; - C.print_arg_list ~wrap:true ~handle:true ~parens:false args optargs; + C.print_arg_list ~wrap:true ~handle:true ~parens:NoParens args optargs; pr ");\n"; ) handle_calls; pr "\n";