diff options
| -rw-r--r-- | lib/stdlib/doc/src/io.xml | 17 | ||||
| -rw-r--r-- | lib/stdlib/src/io_lib_pretty.erl | 2 | ||||
| -rw-r--r-- | lib/stdlib/test/io_SUITE.erl | 22 |
3 files changed, 36 insertions, 5 deletions
diff --git a/lib/stdlib/doc/src/io.xml b/lib/stdlib/doc/src/io.xml index f1037ec76b..d4a2713840 100644 --- a/lib/stdlib/doc/src/io.xml +++ b/lib/stdlib/doc/src/io.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2017</year> + <year>1996</year><year>2018</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -332,11 +332,22 @@ Here T = [{attributes,[[{id,age,1.5}, {tag,{'PRIVATE',3}}, {mode,implicit}] ok</pre> + + <p>As from Erlang/OTP 21.0, a field width of value + <c>0</c> can be used for specifying that a line is + infinitely long, which means that no line breaks + are inserted. For example:</p> + + <pre> +5> <input>io:fwrite("~0p~n", [lists:seq(1, 30)]).</input> +[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30] +ok</pre> + <p>When the modifier <c>l</c> is specified, no detection of printable character lists takes place, for example:</p> <pre> -5> <input>S = [{a,"a"}, {b, "b"}].</input> -6> <input>io:fwrite("~15p~n", [S]).</input> +6> <input>S = [{a,"a"}, {b, "b"}], + io:fwrite("~15p~n", [S]).</input> [{a,"a"}, {b,"b"}] ok diff --git a/lib/stdlib/src/io_lib_pretty.erl b/lib/stdlib/src/io_lib_pretty.erl index 3d5a979b3e..dca1b37ef3 100644 --- a/lib/stdlib/src/io_lib_pretty.erl +++ b/lib/stdlib/src/io_lib_pretty.erl @@ -131,6 +131,8 @@ print(Term, Col, Ll, D, M0, T, RecDefFun, Enc, Str) when is_tuple(Term); %% use Len as CHAR_MAX if M0 = -1 M = max_cs(M0, Len), if + Ll =:= 0 -> + write(If); Len < Ll - Col, Len =< M -> %% write the whole thing on a single line when there is room write(If); diff --git a/lib/stdlib/test/io_SUITE.erl b/lib/stdlib/test/io_SUITE.erl index 13f2cbd27b..91fe1133f6 100644 --- a/lib/stdlib/test/io_SUITE.erl +++ b/lib/stdlib/test/io_SUITE.erl @@ -31,7 +31,7 @@ otp_10836/1, io_lib_width_too_small/1, io_with_huge_message_queue/1, format_string/1, maps/1, coverage/1, otp_14178_unicode_atoms/1, otp_14175/1, - otp_14285/1, limit_term/1, otp_14983/1]). + otp_14285/1, limit_term/1, otp_14983/1, otp_15103/1]). -export([pretty/2, trf/3]). @@ -63,7 +63,7 @@ all() -> io_lib_print_binary_depth_one, otp_10302, otp_10755, otp_10836, io_lib_width_too_small, io_with_huge_message_queue, format_string, maps, coverage, otp_14178_unicode_atoms, otp_14175, - otp_14285, limit_term, otp_14983]. + otp_14285, limit_term, otp_14983, otp_15103]. %% Error cases for output. error_1(Config) when is_list(Config) -> @@ -2615,3 +2615,21 @@ trf(Format, Args, T) -> trf(Format, Args, T, Opts) -> lists:flatten(io_lib:format(Format, Args, [{chars_limit, T}|Opts])). + +otp_15103(_Config) -> + T = lists:duplicate(5, {a,b,c}), + + S1 = io_lib:format("~0p", [T]), + "[{a,b,c},{a,b,c},{a,b,c},{a,b,c},{a,b,c}]" = lists:flatten(S1), + S2 = io_lib:format("~-0p", [T]), + "[{a,b,c},{a,b,c},{a,b,c},{a,b,c},{a,b,c}]" = lists:flatten(S2), + S3 = io_lib:format("~1p", [T]), + "[{a,\n b,\n c},\n {a,\n b,\n c},\n {a,\n b,\n c},\n {a,\n b,\n" + " c},\n {a,\n b,\n c}]" = lists:flatten(S3), + + S4 = io_lib:format("~0P", [T, 5]), + "[{a,b,c},{a,b,...},{a,...},{...}|...]" = lists:flatten(S4), + S5 = io_lib:format("~1P", [T, 5]), + "[{a,\n b,\n c},\n {a,\n b,...},\n {a,...},\n {...}|...]" = + lists:flatten(S5), + ok. |