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Clerk report: better diff coloring
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7e97c19901
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@ -69,16 +69,68 @@ let has_command cmd =
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let check_cmd = Printf.sprintf "type %s >/dev/null 2>&1" cmd in
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Sys.command check_cmd = 0
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let longuest_common_prefix_length s1 s2 =
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let len = min (String.length s1) (String.length s2) in
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let rec aux i =
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if i >= len then i
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else
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let c1 = String.get_utf_8_uchar s1 i in
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let c2 = String.get_utf_8_uchar s2 i in
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if c1 = c2 then aux (i + Uchar.utf_decode_length c1) else i
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type 'a diff = Eq of 'a | Subs of 'a * 'a | Del of 'a | Add of 'a
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let colordiff_str s1 s2 =
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let split_re =
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Re.(compile (alt [set "=()[]{};-,"; rep1 space; rep1 digit]))
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in
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aux 0
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let split s =
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Re.Seq.split_full split_re s
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|> Seq.map (function `Text t -> t | `Delim g -> Re.Group.get g 0)
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in
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let a1 = Array.of_seq (split s1) in
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let n1 = Array.length a1 in
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let a2 = Array.of_seq (split s2) in
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let n2 = Array.length a2 in
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let d = Array.make_matrix n1 n2 (0, []) in
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let get i1 i2 =
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if i1 < 0 then
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( i2 + 1,
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Array.fold_left (fun acc c -> Add c :: acc) [] (Array.sub a2 0 (i2 + 1))
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)
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else if i2 < 0 then
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( i1 + 1,
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Array.fold_left (fun acc c -> Del c :: acc) [] (Array.sub a1 0 (i1 + 1))
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)
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else d.(i1).(i2)
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in
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for i1 = 0 to n1 - 1 do
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for i2 = 0 to n2 - 1 do
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if a1.(i1) = a2.(i2) then
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let eq, eqops = get (i1 - 1) (i2 - 1) in
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d.(i1).(i2) <- eq, Eq a1.(i1) :: eqops
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else
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let del, delops = get (i1 - 1) i2 in
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let add, addops = get i1 (i2 - 1) in
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let subs, subsops = get (i1 - 1) (i2 - 1) in
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if subs <= del && subs <= add then
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d.(i1).(i2) <- subs + 1, Subs (a1.(i1), a2.(i2)) :: subsops
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else if del <= add then d.(i1).(i2) <- del + 1, Del a1.(i1) :: delops
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else d.(i1).(i2) <- add + 1, Add a2.(i2) :: addops
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done
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done;
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let _, rops = get (n1 - 1) (n2 - 1) in
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let ops = List.rev rops in
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let pr_left ppf () =
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Format.pp_print_list
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~pp_sep:(fun _ () -> ())
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(fun ppf -> function
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| Eq w -> Format.fprintf ppf "%s" w
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| Subs (w, _) | Del w -> Format.fprintf ppf "@{<green>%s@}" w
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| Add _ -> ())
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ppf ops
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in
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let pr_right ppf () =
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Format.pp_print_list
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~pp_sep:(fun _ () -> ())
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(fun ppf -> function
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| Eq w -> Format.fprintf ppf "%s" w
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| Subs (_, w) | Add w -> Format.fprintf ppf "@{<red>%s@}" w
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| Del _ -> ())
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ppf ops
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in
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pr_left, pr_right
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let diff_command =
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let has_gnu_diff () =
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@ -139,10 +191,8 @@ let diff_command =
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else Format.fprintf ppf "%s@{<blue>│@}@{<red>%s@}" l r
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| '<' -> Format.fprintf ppf "%s@{<blue>│@}@{<red>-@}" l
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| '|' ->
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let w = longuest_common_prefix_length (" " ^ l) r in
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Format.fprintf ppf "%s@{<blue>│@}%s@{<red>%s@}" l
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(String.sub r 0 w)
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(String.sub r w (String.length r - w))
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let ppleft, ppright = colordiff_str l r in
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Format.fprintf ppf "%a@{<blue>│@}%a" ppleft () ppright ()
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| _ -> Format.pp_print_string ppf li))
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ppf )
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| Some cmd_opt | (None as cmd_opt) ->
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