added minor patches

1 files changed, 310 insertions, 0 deletions

diff --git a/st-autocomplete b/st-autocomplete
new file mode 100644
index 0000000..0fad536
--- /dev/null
+++ b/st-autocomplete
@@ -0,0 +1,310 @@
+#!/usr/bin/perl
+#########################################################################
+# Copyright (C) 2012-2017  Wojciech Siewierski                          #
+#                                                                       #
+# This program is free software: you can redistribute it and/or modify  #
+# it under the terms of the GNU General Public License as published by  #
+# the Free Software Foundation, either version 3 of the License, or     #
+# (at your option) any later version.                                   #
+#                                                                       #
+# This program is distributed in the hope that it will be useful,       #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of        #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         #
+# GNU General Public License for more details.                          #
+#                                                                       #
+# You should have received a copy of the GNU General Public License     #
+# along with this program.  If not, see <http://www.gnu.org/licenses/>. #
+#########################################################################
+
+my ($cmd, $cursor_row, $cursor_column) = @ARGV;
+
+my $lines = [];
+my $lines1 = [];
+
+my $last_line = -1;
+my $lines_before_cursor = 0;
+
+while (<stdin>)
+{
+	$last_line++;
+
+	s/[^[:print:]]/?/g;
+
+	if ($last_line < $cursor_row)
+	{
+		unshift @{$lines1}, $_;
+		$lines_before_cursor++;
+	}
+	else
+	{
+		unshift @{$lines}, $_;
+	}
+}
+
+foreach (@{$lines1})
+{
+	unshift @{$lines}, $_;
+}
+
+my $cursor_row_in = $cursor_row;
+
+$cursor_row = $last_line;
+
+
+$self = {};
+
+# A reference to a function that transforms the completed word
+# into a regex matching the completions. Usually generated by
+# generate_matcher().
+#
+# For example
+#   $fun = generate_matcher(".*");
+#   $fun->("foo");
+# would return "f.*o.*o"
+#
+# In other words, indirectly decides which characters can
+# appear in the completion.
+my $matcher;
+
+# A regular expression matching a character before each match.
+# For example, it you want to match the text after a
+# whitespace, set it to "\s".
+my $char_class_before;
+
+# A regular expression matching every character in the entered
+# text that will be used to find matching completions. Usually
+# "\w" or similar.
+my $char_class_to_complete;
+
+# A regular expression matching every allowed last character
+# of the completion (uses greedy matching).
+my $char_class_at_end;
+
+if ($cmd eq 'word-complete') {
+	# Basic word completion. Completes the current word
+	# without any special matching.
+	$char_class_before      = '[^-\w]';
+	$matcher                = sub { quotemeta shift }; # identity
+	$char_class_at_end      = '[-\w]';
+	$char_class_to_complete = '[-\w]';
+} elsif ($cmd eq 'WORD-complete') {
+	# The same as above but in the Vim meaning of a "WORD" --
+	# whitespace delimited.
+	$char_class_before      = '\s';
+	$matcher                = sub { quotemeta shift };
+	$char_class_at_end      = '\S';
+	$char_class_to_complete = '\S';
+} elsif ($cmd eq 'fuzzy-word-complete' ||
+		 $cmd eq 'skeleton-word-complete') {
+	# Fuzzy completion of the current word.
+	$char_class_before      = '[^-\w]';
+	$matcher                = generate_matcher('[-\w]*');
+	$char_class_at_end      = '[-\w]';
+	$char_class_to_complete = '[-\w]';
+} elsif ($cmd eq 'fuzzy-WORD-complete') {
+	# Fuzzy completion of the current WORD.
+	$char_class_before      = '\s';
+	$matcher                = generate_matcher('\S*');
+	$char_class_at_end      = '\S';
+	$char_class_to_complete = '\S';
+} elsif ($cmd eq 'fuzzy-complete' ||
+		 $cmd eq 'skeleton-complete') {
+	# Fuzzy completion of an arbitrary text.
+	$char_class_before      = '\W';
+	$matcher                = generate_matcher('.*?');
+	$char_class_at_end      = '\w';
+	$char_class_to_complete = '\S';
+} elsif ($cmd eq 'suffix-complete') {
+	# Fuzzy completion of an completing suffixes, like
+	# completing test=hello from /blah/hello.
+	$char_class_before      = '\S';
+	$matcher                = generate_matcher('\S*');
+	$char_class_at_end      = '\S';
+	$char_class_to_complete = '\S';
+} elsif ($cmd eq 'surround-complete') {
+	# Completing contents of quotes and braces.
+
+	# Here we are using three named groups: s, b, p for quotes, braces
+	# and parenthesis.
+	$char_class_before      = '((?<q>["\'`])|(?<b>\[)|(?<p>\())';
+
+	$matcher                = generate_matcher('.*?');
+
+	# Here we match text till enclosing pair, using perl conditionals in
+	# regexps (?(condition)yes-expression|no-expression).
+	# \0 is used to hack concatenation with '*' later in the code.
+	$char_class_at_end      = '.*?(.(?=(?(<b>)\]|((?(<p>)\)|\g{q})))))\0';
+	$char_class_to_complete = '\S';
+}
+
+
+# use the last used word or read the word behind the cursor
+my $word_to_complete = read_word_at_coord($self, $cursor_row, $cursor_column,
+										  $char_class_to_complete);
+
+print stdout "$word_to_complete\n";
+
+if ($word_to_complete) {
+	while (1) {
+		# ignore the completed word itself
+		$self->{already_completed}{$word_to_complete} = 1;
+
+		# continue the last search or start from the current row
+		my $completion = find_match($self,
+									$word_to_complete,
+									$self->{next_row} // $cursor_row,
+									$matcher->($word_to_complete),
+									$char_class_before,
+									$char_class_at_end);
+		if ($completion) {
+			print stdout $completion."\n".join ("\n", @{$self->{highlight}})."\n";
+		}
+		else {
+			last;
+		}
+	}
+}
+
+######################################################################
+
+sub highlight_match {
+    my ($self, $linenum, $completion) = @_;
+
+    # clear_highlight($self);
+
+    my $line = @{$lines}[$linenum];
+    my $re = quotemeta $completion;
+
+    $line =~ /$re/;
+
+    my $beg = $-[0];
+    my $end = $+[0];
+
+	if ($linenum >= $lines_before_cursor)
+	{
+		$lline = $last_line - $lines_before_cursor;
+		$linenum -= $lines_before_cursor;
+		$linenum = $lline - $linenum;
+		$linenum += $lines_before_cursor;
+	}
+
+
+    $self->{highlight} = [$linenum, $beg, $end];
+}
+
+######################################################################
+
+sub read_word_at_coord {
+    my ($self, $row, $col, $char_class) = @_;
+
+    $_ = substr(@{$lines} [$row], 0, $col); # get the current line up to the cursor...
+    s/.*?($char_class*)$/$1/;               # ...and read the last word from it
+    return $_;
+}
+
+######################################################################
+
+# Returns a function that takes a string and returns that string with
+# this function's argument inserted between its every two characters.
+# The resulting string is used as a regular expression matching the
+# completion candidates.
+sub generate_matcher {
+    my $regex_between = shift;
+
+    sub {
+        $_ = shift;
+
+        # sorry for this lispy code, I couldn't resist ;)
+        (join "$regex_between",
+         (map quotemeta,
+          (split //)))
+    }
+}
+
+######################################################################
+
+# Checks whether the completion found by find_match() was already
+# found and if it was, calls find_match() again to find the next
+# completion.
+#
+# Takes all the arguments that find_match() would take, to make a
+# mutually recursive call.
+sub skip_duplicates {
+    my ($self, $word_to_match, $current_row, $regexp, $char_class_before, $char_class_at_end) = @_;
+    my $completion;
+
+	if ($current_row <= $lines_before_cursor)
+	{
+		$completion = shift @{$self->{matches_in_row}}; # get the leftmost one
+	}
+	else
+	{
+		$completion = pop @{$self->{matches_in_row}}; # get the leftmost one
+	}
+
+    # check for duplicates
+    if (exists $self->{already_completed}{$completion}) {
+        # skip this completion
+        return find_match(@_);
+    } else {
+        $self->{already_completed}{$completion} = 1;
+
+		highlight_match($self,
+						$self->{next_row}+1,
+						$completion);
+
+        return $completion;
+    }
+}
+
+######################################################################
+
+# Finds the next matching completion in the row current row or above
+# while skipping duplicates using skip_duplicates().
+sub find_match {
+    my ($self, $word_to_match, $current_row, $regexp, $char_class_before, $char_class_at_end) = @_;
+    $self->{matches_in_row} //= [];
+
+    # cycle through all the matches in the current row if not starting a new search
+    if (@{$self->{matches_in_row}}) {
+        return skip_duplicates($self, $word_to_match, $current_row, $regexp, $char_class_before, $char_class_at_end);
+    }
+
+
+    my $i;
+    # search through all the rows starting with current one or one above the last checked
+    for ($i = $current_row; $i >= 0; --$i) {
+        my $line = @{$lines}[$i];   # get the line of text from the row
+
+        # if ($i == $cursor_row) {
+        #     $line = substr $line, 0, $cursor_column;
+        # }
+
+        $_ = $line;
+
+        # find all the matches in the current line
+        my $match;
+        push @{$self->{matches_in_row}}, $+{match} while ($_, $match) = /
+                                                                         (.*${char_class_before})
+                                                                         (?<match>
+                                                                             ${regexp}
+                                                                             ${char_class_at_end}*
+                                                                         )
+                                                                     /ix;
+        # corner case: match at the very beginning of line
+        push @{$self->{matches_in_row}}, $+{match} if $line =~ /^(${char_class_before}){0}(?<match>$regexp$char_class_at_end*)/i;
+
+        if (@{$self->{matches_in_row}}) {
+            # remember which row should be searched next
+            $self->{next_row} = --$i;
+
+            # arguments needed for find_match() mutual recursion
+            return skip_duplicates($self, $word_to_match, $i, $regexp, $char_class_before, $char_class_at_end);
+        }
+    }
+
+    # # no more possible completions, revert to the original word
+    # undo_completion($self) if $i < 0;
+
+    return undef;
+}