org: more documentation

* doc/org/oaut.org: Mention --dot=a.
* doc/org/autfilt.org: Update list of transformations.

doc/org/oaut.org

@@ -18,17 +18,18 @@ ltl2tgba --help | sed -n '/Output format:/,/^$/p' | sed '1d;$d'
 #+begin_example
   -8, --utf8                 enable UTF-8 characters in output (ignored with
                              --lbtt or --spin)
-      --dot[=c|h|n|N|s|t|v]  GraphViz's format (default).  Add letters to chose
-                             (c) circular nodes, (h) horizontal layout, (v)
-                             vertical layout, (n) with name, (N) without name,
-                             (s) with SCCs, (t) always transition-based
-                             acceptance.
+      --dot[=c|h|n|N|s|t|v]  GraphViz's format (default).  Add letters for (a)
+                             acceptance display, (c) circular nodes, (h)
+                             horizontal layout, (v) vertical layout, (n) with
+                             name, (N) without name, (s) with SCCs, (t) force
+                             transition-based acceptance.
   -H, --hoaf[=s|t|m|l]       Output the automaton in HOA format.  Add letters
-                             to select (s) state-based acceptance, (t)
-                             transition-based acceptance, (m) mixed acceptance,
-                             (l) single-line output
+                             to select (s) prefer state-based acceptance when
+                             possible [default], (t) force transition-based
+                             acceptance, (m) mix state and transition-based
+                             acceptance, (l) single-line output
       --lbtt[=t]             LBTT's format (add =t to force transition-based
-                             acceptance even on Büchi automata)
+                             acceptance even on Büchi automata)
       --name=FORMAT          set the name of the output automaton
   -o, --output=FORMAT        send output to a file named FORMAT instead of
                              standard output.  The first automaton sent to a
@@ -270,7 +271,7 @@ $txt
 #+RESULTS:
 [[file:hoafex.png]]
 
-The [[http://adl.github.io/hoaf/][HOA format]] support both state and transition-based acceptance.
+The [[http://adl.github.io/hoaf/][HOA format]] supports both state and transition-based acceptance.
 Although Spot works only with transition-based acceptance, its output
 routines default to state-based acceptance whenever possible (this is
 the case in the first of these two automata) and use transition-based
@@ -530,30 +531,35 @@ $txt
 This output can be customized by passing optional characters to the
 =--dot= option.  For instance =v= requests a vertical layout (instead
 of the default horizontal layout), =c= requests circle states, =s=
-causes strongly-connected components to be displayed, and =n= causes
-the name (see below) of the automaton to be displayed.
+causes strongly-connected components to be displayed, =n= causes the
+name (see below) of the automaton to be displayed, and =a= causes the
+acceptance condition to be shown as well.
 
 #+BEGIN_SRC sh :results verbatim :exports code
-ltl2tgba --dot=vcsn '(Ga -> Gb) W c'
+ltl2tgba --dot=vcsna '(Ga -> Gb) W c'
 #+END_SRC
 #+RESULTS:
 #+begin_example
 digraph G {
-  label="(Gb | F!a) W c"
+  label="(Gb | F!a) W c\nInf(0)"
   labelloc="t"
   node [shape="circle"]
   I [label="", style=invis, height=0]
   I -> 1
   subgraph cluster_0 {
+  label=""
   0 [label="0"]
   }
   subgraph cluster_1 {
+  label=""
   3 [label="3"]
   }
   subgraph cluster_2 {
+  label=""
   4 [label="4"]
   }
   subgraph cluster_3 {
+  label=""
   1 [label="1"]
   2 [label="2"]
   }
@@ -574,13 +580,13 @@ digraph G {
 
 #+NAME: oaut-dot2
 #+BEGIN_SRC sh :results verbatim :exports none
-ltl2tgba --dot=vcsn '(Ga -> Gb) W c' | sed 's/\\/\\\\/'
+ltl2tgba --dot=vcsna '(Ga -> Gb) W c' | sed 's/\\/\\\\/'
 #+END_SRC
 
 #+RESULTS: oaut-dot2
 #+begin_example
 digraph G {
-  label="(Gb | F!a) W c"
+  label="(Gb | F!a) W c\\nInf(0)"
   labelloc="t"
   node [shape="circle"]
   I [label="", style=invis, height=0]
@@ -624,6 +630,10 @@ $txt
 #+RESULTS:
 [[file:oaut-dot2.png]]
 
+The acceptance condition is displayed in the same way as in the [[http://adl.github.io/hoaf/][HOA
+format]]. Here =Inf(0)= means that runs are accepting if and only if
+they visit some the transitions in the set #0 infinitely often.
+
 * Statistics
 
 The =--stats= option takes format string parameter to specify what and