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#############################################################################
##
## This file is part of GAP, a system for computational discrete algebra.
## This file's authors include Frank Lübeck.
##
## Copyright of GAP belongs to its developers, whose names are too numerous
## to list here. Please refer to the COPYRIGHT file for details.
##
## SPDX-License-Identifier: GPL-2.0-or-later
##
## This file contains function for handling some keys in line edit mode.
## It is only used if the GAP kernel was compiled to use the GNU
## readline library.
##
## To avoid using the readline library, pass '--without-readline' to
## the configure script when compiling GAP.
##

# Declare the user preferences related to readline
# also if readline is not supported,
# in order to get them documented also in this case.
DeclareUserPreference( rec(
 name:= ["HistoryMaxLines", "SaveAndRestoreHistory"],
 description:= [
 "<C>HistoryMaxLines</C> is the maximal amount of input lines held in \
&GAP;'s command line history.",
 "If <C>SaveAndRestoreHistory</C> is <K>true</K> then &GAP; saves its \
command line history before terminating a &GAP; session, and prepends the \
stored history when &GAP; is started. \
If this is enabled it is suggested to set <C>HistoryMaxLines</C> to some \
finite value. \
It is also possible to set <C>HistoryMaxLines</C> to <Ref Var=\"infinity\"/> \
to keep arbitrarily many lines.",
 "These preferences are ignored if &GAP; was not compiled with \
readline support.",
 ],
 default:= [10000, true],
 check:= function(max, save)
 return ((IsInt( max ) and 0 <= max) or max = infinity)
 and save in [true, false];
 end
 )
);

DeclareUserPreference( rec(
 name := "Autocompleter",
 description := [
 "Set how names are filtered during tab-autocomplete, \
this can be: \
<C>\"default\"</C>: case-sensitive matching. \
<C>\"case-insensitive\"</C>: case-insensitive matching, \
or a record with two components named <C>filter</C> and \
<C>completer</C>, which are both functions which take two arguments. \
<C>filter</C> takes a list of names and a partial identifier and returns \
all the members of <C>names</C> which are a valid extension of the partial \
identifier. \
<C>completer</C> takes a list of names and a partial identifier and \
returns the partial identifier as extended as possible (it may also change \
the identifier, for example to correct the case, or spelling mistakes), or \
returns <K>fail</K> to leave the existing partial identifier.",
"This preference is ignored if &GAP; was not compiled with \
readline support.",
 ],
 default := "default",
 ) );

DeclareUserPreference( rec(
 name:= "HistoryBackwardSearchSkipIdenticalEntries",
 description:= [
 "When a command is executed multiple times, it is also stored in history \
multiple times. Setting this option to <K>true</K> skips identical entries \
when searching backwards in history."
 ],
 default:= false,
 values:= [ true, false ],
 multi:= false,
 ) );

if GAPInfo.CommandLineOptions.E then
############################################################################
## readline interface functions
GAPInfo.UseReadline := true;

## <#GAPDoc Label="readline">
## <Section Label="sec:readline">
## <Heading>Editing using the <C>readline</C> library</Heading>
##
## The descriptions in this section are valid only if your &GAP;
## installation uses the <C>readline</C> library for command line editing.
## You can check by <C>IsBound(GAPInfo.UseReadline);</C> if this is the
## case. 
##
## You can use all the features of
## <C>readline</C>, as for example explained
## in <URL>https://tiswww.case.edu/php/chet/readline/rluserman.html</URL>.
## Therefore the command line editing in &GAP; is similar to the
## <C>bash</C> shell and many other programs. On a Unix/Linux system you
## may also have a manpage, try <C>man readline</C>. 
##
## Compared to the command line editing which was used in &GAP; up to
## version 4.4 (or compared to not using the <C>readline</C> library)
## using <C>readline</C> has several advantages:
## <List>
## <Item>Most keys still do the same as explained in
## <Ref Sect="Line Editing"/> (in the default configuration).
## </Item>
## <Item>There are many additional commands, e.g. undoing (Ctrl-_,
## keyboard macros (Ctrl-x(, Ctrl-x) and Ctrl-xe),
## file name completion (hit Esc two or four times),
## showing matching parentheses,
## <C>vi</C>-style key bindings, deleting and yanking text, ...</Item>
## <Item>Lines which are longer than a physical terminal row can be edited
## more conveniently.</Item>
## <Item>Arbitrary unicode characters can be typed into string literals.
## </Item>
## <Item>The key bindings can be configured, either via your
## <File>~/.inputrc</File> file or by &GAP; commands, see <Ref
## Subsect="ssec:readlineCustom"/>.</Item>
## <Item>The command line history can be saved to and read from a file, see
## <Ref Subsect="ssec:cmdlinehistory"/>.</Item>
## 
## <Item>Adventurous users can even implement completely new
## command line editing functions on &GAP; level, see <Ref
## Subsect="ssec:readlineUserFuncs"/>.</Item>
##
## </List>
## 
##
## <Subsection Label="ssec:readlineCustom">
## <Index Key="ReadlineInitLine"><C>ReadlineInitLine</C></Index>
## <Heading>Readline customization</Heading>
##
## You can use your readline init file (by default <File>~/.inputrc</File>
## on Unix/Linux) to customize key bindings. If you want settings be used
## only within &GAP; you can write them between lines containing <C>$if
## GAP</C> and <C>$endif</C>. For a detailed documentation of the available
## settings and functions see <URL Text="here">
## https://tiswww.case.edu/php/chet/readline/rluserman.html</URL>.
##
## <Listing Type="From readline init file">
## $if GAP
## set blink-matching-paren on
## "\C-x\C-o": dump-functions
## "\ep": kill-region
## $endif
## </Listing>
##
## Alternatively, from within &GAP; the command
## <C>ReadlineInitLine(<A>line</A>);</C> can be used, where <A>line</A> is
## a string containing a line as in the init file.
## 
##
## Caveat: &GAP; overwrites the following keys (after reading the
## <File>~/.inputrc</File> file): <C>\C-g</C>, <C>\C-i</C>, <C>\C-n</C>,
## <C>\C-o</C>, <C>\C-p</C>, <C>\C-r</C>, <C>\C-\</C>, <C>\e<</C>,
## <C>\e></C>, <C>Up</C>, <C>Down</C>, <C>TAB</C>, <C>Space</C>,
## <C>PageUp</C>, <C>PageDown</C>. So, do not redefine these in your
## <File>~/.inputrc</File>.
## 
##
## Note that after pressing Ctrl-v the next special character is
## input verbatim. This is very useful to bind keys or key sequences.
## For example, binding the function key F3 to the command
## <C>kill-whole-line</C> by using the sequence Ctrl-v F3
## looks on many terminals like this:
## <C>ReadlineInitLine("\"^[OR\":kill-whole-line");</C>.
## (You can get the line back later with Ctrl-y.)
## 
##
## The Ctrl-g key can be used to type any unicode character by its code
## point. The number of the character can either be given as a count, or if the
## count is one the input characters before the cursor are taken (as decimal
## number or as hex number which starts with <C>0x</C>. For example, the
## double stroke character ℤ can be input by any of the three key
## sequences Esc 8484 Ctrl-g, 8484 Ctrl-g or 0x2124
## Ctrl-g.
## 
##
## Some terminals bind the Ctrl-s and Ctrl-q keys to stop and
## restart terminal output. Furthermore, sometimes Ctrl-\ quits a
## program. To disable this behaviour (and maybe use these keys for command
## line editing) you can use <C>Exec("stty stop undef; stty start undef;
## stty quit undef");</C> in your &GAP; session or your <F>gaprc</F> file
## (see <Ref Sect="sect:gap.ini"/>).
## 
## </Subsection>
##
## <Subsection Label="ssec:cmdlinehistory">
## <Heading>The command line history</Heading>
##
## &GAP; can save your input lines for later reuse. The keys Ctrl-p
## (or Up), Ctrl-n (or Down),
## ESC< and ESC> work as documented in <Ref
## Sect="Line Editing"/>, that is they scroll backward and
## forward in the history or go to its beginning or end.
## Also, Ctrl-o works as documented, it is useful for repeating a
## sequence of previous lines.
## (But Ctrl-l clears the screen as in other programs.)
## 
##
## The command line history can be used across several instances of &GAP;
## via the following two commands.
## </Subsection>
##
## <ManSection >
## <Func Arg="[fname], [app]" Name="SaveCommandLineHistory" />
## <Returns><K>fail</K> or number of saved lines</Returns>
## <Func Arg="[fname], [app]" Name="ReadCommandLineHistory" />
## <Returns><K>fail</K> or number of added lines</Returns>
##
## <Description>
## The first command saves the lines in the command line history to the
## file given by the string <A>fname</A>. The default for <A>fname</A> is
## <F>history</F> in the user's &GAP; root path <C>GAPInfo.UserGapRoot</C>
## or <F>"~/.gap_hist"</F> if this directory does not exist.
## If the optional argument <A>app</A> is
## <K>true</K> then the lines are appended to that file otherwise the file
## is overwritten.
## 
## The second command is the converse, it reads the lines from file
## <A>fname</A>. If the optional argument <A>app</A> is true the lines
## are appended to the history, else it <Emph>prepends</Emph> them.
## 
## By default, the command line history stores up to 1000 input lines.
## command line history. This number may be restricted or enlarged via
## via <C>SetUserPreference("HistoryMaxLines", num);</C> which may be set
## to a non negative number <C>num</C> to store up to <C>num</C> input
## lines or to <K>infinity</K> to store arbitrarily many lines.
## An automatic storing and restoring of the command line history can
## be configured via
## <C>SetUserPreference("SaveAndRestoreHistory", true);</C>.
## 
## Note that these functions are only available if your &GAP; is configured
## to use the <C>readline</C> library.
## </Description>
## </ManSection>
##
## <Subsection Label="ssec:readlineUserFuncs">
## <Index Key="InstallReadlineMacro"><C>InstallReadlineMacro</C></Index>
## <Index Key="InvocationReadlineMacro"><C>InvocationReadlineMacro</C></Index>
##
## <Heading>Writing your own command line editing functions</Heading>
## It is possible to write new command line editing functions in &GAP; as
## follows.
## 
## The functions have one argument <A>l</A> which is a list with five
## entries of the form <C>[count, key, line, cursorpos, markpos]</C> where
## <C>count</C> and <C>key</C> are the last pressed key and its count
## (these are not so useful here because users probably do not want to
## overwrite the binding of a single key), then <C>line</C> is a string
## containing the line typed so far, <C>cursorpos</C> is the current
## position of the cursor (point), and <C>markpos</C> the current position
## of the mark.
## 
## The result of such a function must be a list which can have various
## forms:
## <List >
## <C>[str]</C>
## <Item>with a string <C>str</C>. In this case the text <C>str</C> is
## inserted at the cursor position.</Item>
## <C>[kill, begin, end]</C>
## <Item> where <C>kill</C> is <K>true</K> or <K>false</K> and <C>begin</C>
## and <C>end</C> are positions on the input line. This removes the text
## from the lower position to before the higher position. If <C>kill</C>
## is <K>true</K> the text is killed, i.e. put in the kill ring for later
## yanking.
## </Item>
## <C>[begin, end, str]</C>
## <Item>where <C>begin</C> and <C>end</C> are positions on the input line
## and <C>str</C> is a string.
## Then the text from position <C>begin</C> to before <C>end</C> is
## substituted by <C>str</C>.
## </Item>
## <C>[1, lstr]</C>
## <Item>
## where <C>lstr</C> is a list of strings. Then these strings are displayed
## like a list of possible completions. The input line is not changed.
## </Item>
## <C>[2, chars]</C>
## <Item>where <C>chars</C> is a string. The characters from <C>chars</C>
## are used as the next characters from the input. (At most 512 characters
## are possible.)</Item>
## <C>[100]</C>
## <Item>This rings the bell as configured in the terminal.</Item>
## </List>
##
## In the first three cases the result list can contain a position as a
## further entry, this becomes the new cursor position. Or it
## can contain two positions as further entries, these become the new
## cursor position and the new position of the mark.
## 
##
## Such a function can be installed as a macro for <C>readline</C> via
## <C>InstallReadlineMacro(name, fun);</C> where <C>name</C> is a string
## used as name of the macro and <C>fun</C> is a function as above.
## This macro can be called by a key sequence which is returned by
## <C>InvocationReadlineMacro(name);</C>.
## 
## As an example we define a function which puts double quotes around the
## word under or before the cursor position. The space character, the
## characters in <C>"(,)"</C>, and the beginning and end of the line
## are considered as word boundaries. The function is then installed as a
## macro and bound to the key sequence Esc Q.
## 
## <Log>
## gap> EditAddQuotes := function(l)
## > local str, pos, i, j, new;
## > str := l[3];
## > pos := l[4];
## > i := pos;
## > while i > 1 and (not str[i-1] in ",( ") do
## > i := i-1;
## > od;
## > j := pos;
## > while IsBound(str[j]) and not str[j] in ",) " do
## > j := j+1;
## > od;
## > new := "\"";
## > Append(new, str{[i..j-1]});
## > Append(new, "\"");
## > return [i, j, new];
## > end;;
## gap> InstallReadlineMacro("addquotes", EditAddQuotes);
## gap> invl := InvocationReadlineMacro("addquotes");;
## gap> ReadlineInitLine(Concatenation("\"\\eQ\":\"",invl,"\""));;
## </Log>
## </Subsection>
##
## </Section>
## <#/GAPDoc>
##

if not IsBound(GAPInfo.CommandLineEditFunctions) then
 GAPInfo.CommandLineEditFunctions := rec(
 # This is the GAP function called by the readline handler function
 # handled-by-GAP (GAP_rl_func in src/sysfiles.c).
 KeyHandler := function(l)
 local macro, res, key;
 # remember this key
 key := l[2];
 res:=[];
 if l[2] >= 1000 then
 macro := QuoInt(l[2], 1000);
 if IsBound(GAPInfo.CommandLineEditFunctions.Macros.(macro)) then
 res := GAPInfo.CommandLineEditFunctions.Macros.(macro)(l);
 fi;
 else
 if IsBound(GAPInfo.CommandLineEditFunctions.Functions.(l[2])) then
 res := GAPInfo.CommandLineEditFunctions.Functions.(l[2])(l);
 fi;
 fi;
 GAPInfo.CommandLineEditFunctions.LastKey := key;
 return res;
 end,
 Macros := rec(),
 Functions := rec(),
 # here we save readline init lines for post restore
 RLInitLines := [],
 RLKeysGAPHandler := []
 );
 if IsHPCGAP then
 GAPInfo.CommandLineEditFunctions :=
 AtomicRecord(GAPInfo.CommandLineEditFunctions);
 fi;
fi;

# wrapper around kernel functions to store data for post restore function
BindGlobal("ReadlineInitLine", function(str)
 READLINEINITLINE(ShallowCopy(str));
 Add(GAPInfo.CommandLineEditFunctions.RLInitLines, str);
end);
BindGlobal("BindKeysToGAPHandler", function(str)
 BINDKEYSTOGAPHANDLER(ShallowCopy(str));
 Add(GAPInfo.CommandLineEditFunctions.RLKeysGAPHandler, str);
end);

CallAndInstallPostRestore( function()
 local clef, l, a;
 clef := GAPInfo.CommandLineEditFunctions;
 l := clef.RLKeysGAPHandler;
 clef.RLKeysGAPHandler := [];
 for a in l do
 BindKeysToGAPHandler(a);
 od;
 l := clef.RLInitLines;
 clef.RLInitLines := [];
 for a in l do
 ReadlineInitLine(a);
 od;
end);

# bind macro to a key sequence
BindGlobal("BindKeySequence", function(seq, subs)
 ReadlineInitLine(Concatenation("\"", seq, "\": \"", subs, "\""));
end);

# general utility functions
# ringing bell according to terminal configuration (rl_ding)
GAPInfo.CommandLineEditFunctions.Functions.RingBell := function(arg)
 return [100];
end;
# sends <Return> and so calls accept-line
GAPInfo.CommandLineEditFunctions.Functions.AcceptLine := function(arg)
 return [101];
end;
# cands is list of strings, this displays them as matches for completion
# (rl_display_match_list)
GAPInfo.CommandLineEditFunctions.Functions.DisplayMatches := function(cand)
 return [1, cand];
end;
# this inserts a sequence of keys given as string into the input stream
# (rl_stuff_char, up to 512 characters are accepted)
GAPInfo.CommandLineEditFunctions.Functions.StuffChars := function(str)
 return [2, str];
end;

GAPInfo.CommandLineEditFunctions.Functions.UnicodeChar := function(l)
 local helper, j, i, hc, hex, c, pos, k;
 # same as GAPDoc's UNICODE_RECODE.UTF8UnicodeChar
 helper := function ( n )
 local res, a, b, c, d;
 res := "";
 if n < 0 then
 return fail;
 elif n < 128 then
 Add( res, CHAR_INT( n ) );
 elif n < 2048 then
 a := n mod 64;
 b := (n - a) / 64;
 Add( res, CHAR_INT( b + 192 ) );
 Add( res, CHAR_INT( a + 128 ) );
 elif n < 65536 then
 a := n mod 64;
 n := (n - a) / 64;
 b := n mod 64;
 c := (n - b) / 64;
 Add( res, CHAR_INT( c + 224 ) );
 Add( res, CHAR_INT( b + 128 ) );
 Add( res, CHAR_INT( a + 128 ) );
 elif n < 2097152 then
 a := n mod 64;
 n := (n - a) / 64;
 b := n mod 64;
 n := (n - b) / 64;
 c := n mod 64;
 d := (n - c) / 64;
 Add( res, CHAR_INT( d + 240 ) );
 Add( res, CHAR_INT( c + 128 ) );
 Add( res, CHAR_INT( b + 128 ) );
 Add( res, CHAR_INT( a + 128 ) );
 else
 return fail;
 fi;
 return res;
 end;
 # if count=1 we consider the previous characters
 if l[1] = 1 then
 j := l[4]-1;
 i := j;
 hc := "0123456789abcdefABCDEF";
 while i > 0 and l[3][i] in hc do
 i := i-1;
 od;
 if i>1 and l[3][i] = 'x' and l[3][i-1] = '0' then
 hex := true;
 i := i-1;
 else
 hex := false;
 i := i+1;
 fi;
 c := 0;
 if hex then
 for k in [i+2..j] do
 pos := Position(hc, l[3][k]);
 if pos > 16 then
 pos := pos-6;
 fi;
 c := c*16+(pos-1);
 od;
 else
 for k in [i..j] do
 pos := Position(hc, l[3][k]);
 c := c*10 + (pos-1);
 od;
 fi;
 return [i, j+1, helper(c)];
 else
 return [helper(l[1])];
 fi;
end;
GAPInfo.CommandLineEditFunctions.Functions.7 :=
 GAPInfo.CommandLineEditFunctions.Functions.UnicodeChar;
BindKeysToGAPHandler("\007");

# The history is stored within the GAPInfo record. Several GAP level
# command line edit functions below deal with the history. The maximal
# number of lines in the history is configurable via a user preference.
# TODO: should it be made thread-local in HPC-GAP?
if not IsBound(GAPInfo.History) then
 GAPInfo.History := rec(Lines := [], Pos := 0, Last := 0);
fi;

## We use key 0 (not bound) to add line to history.
GAPInfo.CommandLineEditFunctions.Functions.AddHistory := function(l)
 local i, max, hist;
 max := UserPreference("HistoryMaxLines");
 # no history
 if max <= 0 then
 return [];
 fi;
 # no trailing white space
 i := 0;
 while Length(l[3]) > 0 and Last(l[3]) in "\n\r\t " do
 Remove(l[3]);
 i := i + 1;
 od;
 if Length(l[3]) = 0 then
 return [false, 1, i+1, 1];
 fi;
 hist := GAPInfo.History.Lines;
 while Length(hist) >= max do
 # overrun, throw oldest line away
 Remove(hist, 1);
 GAPInfo.History.Last := GAPInfo.History.Last - 1;
 od;
 Add(hist, l[3]);
 GAPInfo.History.Pos := Length(hist) + 1;
 if i = 0 then
 return [];
 else
 return [false, Length(l[3])+1, Length(l[3]) + i + 1];
 fi;
end;
GAPInfo.CommandLineEditFunctions.Functions.0 :=
 GAPInfo.CommandLineEditFunctions.Functions.AddHistory;

## C-p: previous line starting like current before point
GAPInfo.CommandLineEditFunctions.Functions.BackwardHistory := function(l)
 local hist, n, start;
 if UserPreference("HistoryMaxLines") <= 0 then
 return [];
 fi;
 hist := GAPInfo.History.Lines;
 n := GAPInfo.History.Pos;
 # searching backward in history for line starting with input before cursor
 if l[4] = Length(l[3]) + 1 then
 start := l[3];
 else
 start := l[3]{[1..l[4]-1]};
 fi;
 while n > 1 do
 n := n - 1;
 if PositionSublist(hist[n], start) = 1 then
 if UserPreference("HistoryBackwardSearchSkipIdenticalEntries") and hist[n] = l[3] then
 continue;
 fi;
 GAPInfo.History.Pos := n;
 GAPInfo.History.Last := n;
 return [1, Length(l[3])+1, hist[n], l[4]];
 fi;
 od;
 # not found, delete rest of line and wrap over
 GAPInfo.History.Pos := Length(hist)+1;
 if Length(start) = Length(l[3]) then
 return [];
 else
 return [false, l[4], Length(l[3])+1];
 fi;
end;
# bind to C-p and map Up-key
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('P') mod 32) :=
 GAPInfo.CommandLineEditFunctions.Functions.BackwardHistory;
BindKeysToGAPHandler("\020");
ReadlineInitLine("\"\\eOA\": \"\\C-p\"");
ReadlineInitLine("\"\\e[A\": \"\\C-p\"");

## C-n: next line starting like current before point
GAPInfo.CommandLineEditFunctions.Functions.ForwardHistory := function(l)
 local hist, n, start;
 if UserPreference("HistoryMaxLines") <= 0 then
 return [];
 fi;
 hist := GAPInfo.History.Lines;
 n := GAPInfo.History.Pos;
 if n > Length(hist) then
 # special case on empty line, we don't wrap to the beginning, but
 # the position of the last history use
 if Length(l[3]) = 0 and GAPInfo.History.Last < Length(hist) then
 GAPInfo.History.Pos := GAPInfo.History.Last;
 n := GAPInfo.History.Pos;
 else
 n := 0;
 fi;
 fi;
 # searching forward in history for line starting with input before cursor
 if l[4] = Length(l[3]) + 1 then
 start := l[3];
 else
 start := l[3]{[1..l[4]-1]};
 fi;
 while n < Length(hist) do
 n := n + 1;
 if PositionSublist(hist[n], start) = 1 then
 GAPInfo.History.Pos := n;
 GAPInfo.History.Last := n;
 return [1, Length(l[3])+1, hist[n], l[4]];
 fi;
 od;
 # not found, delete rest of line and wrap over
 GAPInfo.History.Pos := Length(hist)+1;
 if Length(start) = Length(l[3]) then
 return [];
 else
 return [false, l[4], Length(l[3])+1];
 fi;
end;
# bind to C-n and map Down-key
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('N') mod 32) :=
 GAPInfo.CommandLineEditFunctions.Functions.ForwardHistory;
BindKeysToGAPHandler("\016");
ReadlineInitLine("\"\\eOB\": \"\\C-n\"");
ReadlineInitLine("\"\\e[B\": \"\\C-n\"");

## ESC <: beginning of history
GAPInfo.CommandLineEditFunctions.Functions.BeginHistory := function(l)
 if UserPreference("HistoryMaxLines") <= 0 or
 Length(GAPInfo.History.Lines) = 0 then
 return [];
 fi;
 GAPInfo.History.Pos := 1;
 GAPInfo.History.Last := 1;
 return [1, Length(l[3]), GAPInfo.History.Lines[1], 1];
end;
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('<')) :=
 GAPInfo.CommandLineEditFunctions.Functions.BeginHistory;
BindKeysToGAPHandler("\\e<");

## ESC >: end of history
GAPInfo.CommandLineEditFunctions.Functions.EndHistory := function(l)
 if UserPreference("HistoryMaxLines") <= 0 or
 Length(GAPInfo.History.Lines) = 0 then
 return [];
 fi;
 GAPInfo.History.Pos := Length(GAPInfo.History.Lines);
 GAPInfo.History.Last := GAPInfo.History.Pos;
 return [1, Length(l[3]), GAPInfo.History.Lines[GAPInfo.History.Pos], 1];
end;
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('>')) :=
 GAPInfo.CommandLineEditFunctions.Functions.EndHistory;
BindKeysToGAPHandler("\\e>");

## C-o: line after last choice from history (for executing consecutive
## lines from the history
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('O') mod 32) := function(l)
 local n, cf;
 cf := GAPInfo.CommandLineEditFunctions;
 if IsBound(cf.ctrlo) then
 n := GAPInfo.History.Last + 1;
 if UserPreference("HistoryMaxLines") <= 0 or
 Length(GAPInfo.History.Lines) < n then
 return [];
 fi;
 GAPInfo.History.Last := n;
 Unbind(cf.ctrlo);
 return [1, Length(l[3]), GAPInfo.History.Lines[n], 1];
 else
 cf.ctrlo := true;
 return GAPInfo.CommandLineEditFunctions.Functions.StuffChars("\015\017");
 fi;
end;
BindKeysToGAPHandler("\017");

## C-r: previous line containing text between mark and point (including
## the smaller, excluding the larger)
GAPInfo.CommandLineEditFunctions.Functions.HistorySubstring := function(l)
 local hist, n, txt, pos;
 if UserPreference("HistoryMaxLines") <= 0 then
 return [];
 fi;
 hist := GAPInfo.History.Lines;
 n := GAPInfo.History.Pos;
 # text to search
 if l[4] < l[5] then
 if l[5] > Length(l[3])+1 then
 l[5] := Length(l[3])+1;
 fi;
 txt := l[3]{[l[4]..l[5]-1]};
 else
 if l[5] < 1 then
 l[5] := 1;
 fi;
 txt := l[3]{[l[5]..l[4]-1]};
 fi;
 while n > 1 do
 n := n - 1;
 pos := PositionSublist(hist[n], txt);
 if pos <> fail then
 GAPInfo.History.Pos := n;
 return [1, Length(l[3])+1, hist[n], pos + Length(txt), pos];
 fi;
 od;
 # not found, do nothing and wrap over
 GAPInfo.History.Pos := Length(hist)+1;
 return [];
end;
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('R') mod 32) :=
 GAPInfo.CommandLineEditFunctions.Functions.HistorySubstring;
BindKeysToGAPHandler("\022");

############################################################################
##
#F SaveCommandLineHistory( [<fname>], [append] )
#F ReadCommandLineHistory( [<fname>] )
##
## Use the first command to write the currently saved command lines in the
## history to file <fname>. If not given the default file name 'history'
## in GAPInfo.UserGapRoot or '~/.gap_hist' is used.
## The second command prepends the lines from <fname> to the current
## command line history (as much as possible when the user preference
## HistoryMaxLines is less than infinity).
##
BindGlobal("SaveCommandLineHistory", function(arg)
 local fnam, append, hist, out;

 if Length(arg) > 0 then
 fnam := arg[1];
 else
 if IsExistingFile(GAPInfo.UserGapRoot) then
 fnam := Concatenation(GAPInfo.UserGapRoot, "/history");
 else
 fnam := UserHomeExpand("~/.gap_hist");
 fi;
 fi;
 if true in arg then
 append := true;
 else
 append := false;
 fi;
 hist := GAPInfo.History.Lines;
 out := OutputTextFile(fnam, append);
 if out = fail then
 return fail;
 fi;
 SetPrintFormattingStatus(out, false);
 WriteAll(out,JoinStringsWithSeparator(hist,"\n"));
 WriteAll(out,"\n");
 CloseStream(out);
 return Length(hist);
end);

BindGlobal("ReadCommandLineHistory", function(arg)
 local hist, max, fnam, s, append;
 hist := GAPInfo.History.Lines;
 max := UserPreference("HistoryMaxLines");
 if Length(arg) > 0 and IsString(arg[1]) then
 fnam := arg[1];
 else
 if IsExistingFile(GAPInfo.UserGapRoot) then
 fnam := Concatenation(GAPInfo.UserGapRoot, "/history");
 else
 fnam := UserHomeExpand("~/.gap_hist");
 fi;
 fi;
 if true in arg then
 append := true;
 else
 append := false;
 fi;
 s := StringFile(fnam);
 if s = fail then
 return fail;
 fi;

 s := SplitString(s, "", "\n");

 if append then
 if Length(s) > max then
 s := s{[1..max]};
 fi;
 Append(hist, s);
 if Length(hist) > max then
 hist := hist{[Length(hist) - max..Length(hist)]};
 fi;
 else
 if Length(hist) >= max then
 return 0;
 fi;
 if Length(s) + Length(hist) > max then
 s := s{[Length(s)-max+Length(hist)+1..Length(s)]};
 fi;
 hist := Concatenation(s, hist);
 fi;
 GAPInfo.History.Lines := hist;
 GAPInfo.History.Last := 0;
 GAPInfo.History.Pos := Length(hist) + 1;
 return Length(s);
end);

### Free: C-g, C-^

## This deletes the content of current buffer line, when appending a space
## would result in a sequence of space- and tab-characters followed by the
## current prompt. Otherwise a space is inserted at point.
GAPInfo.DeletePrompts := true;
GAPInfo.CommandLineEditFunctions.Functions.SpaceDeletePrompt := function(l)
 local txt, len, pr, i;
 if GAPInfo.DeletePrompts <> true or l[4] = 1 or l[3][l[4]-1] <> '>' then
 return [" "];
 fi;
 txt := l[3];
 len := Length(txt);
 pr := CPROMPT();
 Remove(pr);
 i := 1;
 while txt[i] in "\t " do
 i := i+1;
 od;
 if len - i+1 = Length(pr) and txt{[i..len]} = pr then
 return [false, 1, i+Length(pr), 1];
 fi;
 return [" "];
end;
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR(' ')) :=
 GAPInfo.CommandLineEditFunctions.Functions.SpaceDeletePrompt;
BindKeysToGAPHandler(" ");

# These methods implement 'extender' for standard case sensitive and
# case insensitive matching.
# These methods take a list of candidates (cand), and the current
# partially written identifier from the command line. They return a
# replacement for 'identifier'. This extends 'identifier'
# to include all characters which occur in all members of cand.
# In the case-insensitive case this matching is done case-insensitively,
# and we also change the existing letters of the identifier to match
# identifiers.
# When there is no extension or change, these methods return 'fail'.
BindGlobal("STANDARD_EXTENDERS", rec(
 caseSensitive := function(cand, word)
 local i, j, c, match;
 i := Length(word);
 while true do
 if i = Length(cand[1]) then
 break;
 fi;
 c := cand[1][i+1];
 match := true;
 for j in [2..Length(cand)] do
 if Length(cand[j]) <= i or cand[j][i+1] <> c then
 match := false;
 break;
 fi;
 od;
 if not match then
 break;
 else
 i := i+1;
 fi;
 od;
 if i > Length(word) then
 return cand[1]{[1..i]};
 else
 return fail;
 fi;
 end,

 caseInsensitive := function(cand, word)
 local i, j, c, lowword, filtequal, match;
 # Check if exactly 'word' exists, ignoring case.
 lowword := LowercaseString(word);
 # If there are several equal words, just pick the first one...
 filtequal := First(cand, a -> LowercaseString(a) = lowword);
 if filtequal <> fail then
 return filtequal;
 fi;
 i := Length(word);
 while true do
 if i = Length(cand[1]) then
 break;
 fi;
 c := LowercaseChar(cand[1][i+1]);
 match := true;
 for j in [2..Length(cand)] do
 if Length(cand[j]) <= i or LowercaseChar(cand[j][i+1]) <> c then
 match := false;
 break;
 fi;
 od;
 if not match then
 break;
 else
 i := i+1;
 fi;
 od;
 if i >= Length(word) then
 return cand[1]{[1..i]};
 else
 return fail;
 fi;
 end,
));

# C-i: Completion as GAP level function
GAPInfo.CommandLineEditFunctions.Functions.Completion := function(l)
 local cf, pos, word, wordplace, idbnd, i, cmps, r, searchlist, cand, j,
 completeFilter, completeExtender, extension, hasbang;

 completeFilter := function(filterlist, partial)
 local pref, lowpartial;
 pref := UserPreference("Autocompleter");
 if pref = "case-insensitive" then
 lowpartial := LowercaseString(partial);
 return Filtered(filterlist,
 a -> PositionSublist(LowercaseString(a), lowpartial) = 1);
 elif pref = "default" then
 return Filtered(filterlist, a-> PositionSublist(a, partial) = 1);
 elif IsRecord(pref) and IsFunction(pref.completer) then
 return pref.completer(filterlist, partial);
 else
 ErrorNoReturn("Invalid setting of UserPreference 'Autocompleter'");
 fi;
 end;

 completeExtender := function(filterlist, partial)
 local pref;
 pref := UserPreference("Autocompleter");
 if pref = "case-insensitive" then
 return STANDARD_EXTENDERS.caseInsensitive(filterlist, partial);
 elif pref = "default" then
 return STANDARD_EXTENDERS.caseSensitive(filterlist, partial);
 elif IsRecord(pref) and IsFunction(pref.extender) then
 return pref.extender(filterlist, partial);
 else
 ErrorNoReturn("Invalid setting of UserPreference 'Autocompleter'");
 fi;
 end;

 # check if Ctrl-i was hit repeatedly in a row
 cf := GAPInfo.CommandLineEditFunctions;
 if Length(l)=6 and l[6] = true and cf.LastKey = 9 then
 cf.tabcount := cf.tabcount + 1;
 else
 cf.tabcount := 1;
 Unbind(cf.tabrec);
 Unbind(cf.tabbang);
 Unbind(cf.tabcompnam);
 fi;
 pos := l[4]-1;
 # in whitespace in beginning of line \t is just inserted
 if ForAll([1..pos], i -> l[3][i] in " \t") then
 return ["\t"];
 fi;
 # find word to complete
 while pos > 0 and l[3][pos] in IdentifierLetters do
 pos := pos-1;
 od;
 wordplace := [pos+1, l[4]-1];
 word := l[3]{[wordplace[1]..wordplace[2]]};
 # see if we are in the case of a component name
 while pos > 0 and l[3][pos] in " \n\t\r" do
 pos := pos-1;
 od;
 idbnd := IDENTS_BOUND_GVARS();
 if pos > 0 and l[3][pos] = '.' then
 cf.tabcompnam := true;
 if cf.tabcount = 1 then
 # try to find name of component object
 i := pos;
 while i > 0 and (l[3][i] in IdentifierLetters or l[3][i] in ".!") do
 i := i-1;
 od;
 cmps := SplitString(l[3]{[i+1..pos]}, ".");
 hasbang := [];
 i := Length(cmps);
 while i > 0 do
 # distinguish '.' from '!.' and record for each component which was used
 if Last(cmps[i]) = '!' then
 hasbang[i] := true;
 Remove(cmps[i]); # remove the trailing '!'
 else
 hasbang[i] := false;
 fi;
 NormalizeWhitespace(cmps[i]);
 if not IsValidIdentifier(cmps[i]) then
 break;
 fi;
 i := i-1;
 od;
 hasbang := hasbang{[i+1..Length(cmps)]};
 cmps := cmps{[i+1..Length(cmps)]};
 r := fail;
 if Length(cmps) > 0 and cmps[1] in idbnd then
 r := ValueGlobal(cmps[1]);
 for j in [2..Length(cmps)] do
 if not hasbang[j-1] and IsRecord(r) and IsBound(r.(cmps[j])) then
 r := r.(cmps[j]);
 elif hasbang[j-1] and (IsRecord(r) or IsComponentObjectRep(r)) and IsBound(r!.(cmps[j])) then
 r := r!.(cmps[j]);
 else
 r := fail;
 break;
 fi;
 od;
 fi;
 if IsRecord(r) or IsComponentObjectRep(r) then
 cf.tabrec := r;
 cf.tabbang := hasbang[Length(cmps)];
 fi;
 fi;
 fi;
 # now produce the searchlist
 if IsBound(cf.tabrec) then
 # the first two <TAB> hits try existing component names only first
 if cf.tabbang then
 searchlist := ShallowCopy(NamesOfComponents(cf.tabrec));
 elif IsRecord(cf.tabrec) then
 searchlist := ShallowCopy(RecNames(cf.tabrec));
 else
 searchlist := [];
 fi;
 if cf.tabcount > 2 then
 Append(searchlist, ALL_RNAMES());
 fi;
 else
 # complete variable name
 searchlist := idbnd;
 fi;

 cand := completeFilter(searchlist, word);
 # in component name search we try again with all names if this is empty
 if IsBound(cf.tabcompnam) and Length(cand) = 0 and cf.tabcount < 3 then
 searchlist := ALL_RNAMES();
 cand := completeFilter(searchlist, word);
 fi;

 if (not IsBound(cf.tabcompnam) and cf.tabcount = 2) or
 (IsBound(cf.tabcompnam) and cf.tabcount in [2,4]) then
 if Length(cand) > 0 then
 # we prepend the partial word which was completed
 return GAPInfo.CommandLineEditFunctions.Functions.DisplayMatches(
 Concatenation([word], Set(cand)));
 else
 # ring the bell
 return GAPInfo.CommandLineEditFunctions.Functions.RingBell();
 fi;
 fi;
 if Length(cand) = 0 then
 return [];
 elif Length(cand) = 1 then
 return [ wordplace[1], wordplace[2]+1, cand[1]{[1..Length(cand[1])]}];
 fi;
 extension := completeExtender(cand, word);
 if extension = fail then
 return [];
 else
 return [ wordplace[1], wordplace[2] + 1, extension ];
 fi;
end;
GAPInfo.CommandLineEditFunctions.Functions.(INT_CHAR('I') mod 32) :=
 GAPInfo.CommandLineEditFunctions.Functions.Completion;
BindKeysToGAPHandler("\011");

#############################################################################
##
## Simple utilities to create an arbitrary number of macros
##
# name a string, fun a function
InstallReadlineMacro := function(name, fun)
 local cfm, pos;
 cfm := GAPInfo.CommandLineEditFunctions.Macros;
 if not IsBound(cfm.Names) then
 cfm.Names := [];
 fi;
 pos := Position(cfm.Names, name);
 if pos = fail then
 pos := Length(cfm.Names)+1;
 fi;
 cfm.(pos) := fun;
 cfm.Names[pos] := name;
end;
# A sequence to invoce macro name ('ESC num C-x C-g' sets GAPMacroNumber in
# kernel and then any key that calls handled-by-GAP will do it)
# We assume that 'C-xC-g' and <TAB> are not overwritten.
InvocationReadlineMacro := function(name)
 local cfm, pos;
 cfm := GAPInfo.CommandLineEditFunctions.Macros;
 if not IsBound(cfm.Names) then
 cfm.Names := [];
 fi;
 pos := Position(cfm.Names, name);
 if pos = fail then
 return fail;
 fi;
 return Concatenation("\033", String(pos), "\030\007\t");
end;
## # Example
## gap> InstallReadlineMacro("My Macro", function(l) return ["my text"]; end);
## gap> InvocationReadlineMacro("My Macro");
## "\0331\030\007\t"
## gap> BindKeySequence("^[OR",last); # first arg with C-v<F3>

 # for compatibility with the non-readline kernel code
 LineEditKeyHandlers := [];
 LineEditKeyHandler := function(l)
 return [l[1], l[3], l[5]];
 end;
else
 # some experimental code, use readline instead
 ReadLib("cmdleditx.g");

fi;

Quelle cmdledit.g Sprache: unbekannt

[Dauer der Verarbeitung: 0.7 Sekunden, vorverarbeitet 2026-10-20]