namespace eval ::txcursor:: {} proc ::txcursor::sconcat {args} {foreach el $args {append x $el} ; return $x} proc ::txcursor::jump_cursor {tx ix} { $tx mark set insert $ix $tx see insert } proc ::txcursor::is_whitespace {s} { expr {[string is space -strict $s]} } proc ::txcursor::get_char_forward {tx ix} { $tx get $ix [sconcat $ix +1c] } proc ::txcursor::get_char_backward {tx ix} { $tx get [sconcat $ix -1c] $ix } proc ::txcursor::group_forward {tx} { set ix [$tx index insert] set s [::txcursor::get_char_forward $tx $ix] set g_ws [::txcursor::is_whitespace $s] while {$ix ne "end"} { set s [::txcursor::get_char_forward $tx $ix] set c_ws [::txcursor::is_whitespace $s] if {$c_ws != $g_ws} break set ix [$tx index [sconcat $ix +1c]] } ::txcursor::jump_cursor $tx $ix } proc ::txcursor::group_backward {tx} { set ix [$tx index insert] set s [::txcursor::get_char_backward $tx $ix] set g_ws [::txcursor::is_whitespace $s] while {$ix ne "1.0"} { set s [::txcursor::get_char_backward $tx $ix] set c_ws [::txcursor::is_whitespace $s] if {$c_ws != $g_ws} break set ix [$tx index [sconcat $ix -1c]] } ::txcursor::jump_cursor $tx $ix } set tx .t pack [text $tx] -fill both -expand 1 # alt-b and alt-f jump words like emacs bind $tx [list ::txcursor::group_backward $tx] bind $tx [list ::txcursor::group_forward $tx]