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From: "G.B." <bauhaus@futureapps.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Pretty-printer? (Alternatives to "gnatpp")
Date: Mon, 14 Mar 2016 13:01:30 +0100
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Date: 2016-03-14T13:01:30+01:00
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On 14.03.16 07:43, Bob Butler wrote:
> On 2016-03-13, Georg Bauhaus <bauhaus@futureapps.invalid> wrote:
>> On 13.03.16 19:07, Jacob Sparre Andersen wrote:
>>>    2) You can't get it to select the casing of identifiers on a
>>>       word-by-word basis (which means that I have to repeat every acronym
>>>       we use in the project once for every identifier it occurs in).
>>
>> The (new) Ada mode for Emacs can be used as a pretty printer,
>> for all versions of Ada, and it supports automatic letter case.
>> The user may define a list of exceptions to the casing rules
>> that he prefers.
>
> I thought of that too but I don't know if you can print from Emacs. I guess
> you probably can, there isn't much Emacs can't do.

You can print from Emacs, as the following example shows.
(To "print" as in to "write pretty printed text to output";
there also is colored postscript printing, etc.)

Ada mode does report syntax errors. Still, it is lenient
when all that it should do is letter case. Example input:

procedure Synerr is
begin
    null:
end synErr;

about which file Emacs says, when visiting,

synerr.adb:3:8: syntax error in grammar state 641; unexpected :, 
expecting one of (default SEMICOLON)

And then, indeed, trying to indent will screw up the indentation.
Nevertheless, evaluating the sequence of commands

(ada-case-adjust-buffer)
(write-file "synerr.pretty.adb")

will yield a new file "synerr.pretty.adb" that looks like this:

procedure Synerr is
begin
    null:
end Synerr;

So, the last line now also follows the usual letter case rules,
spelling "Synerr" the same in both places. (The syntax error is
still present.)