Gtksourceview is a text widget that extends the standard gtk+ 2.x text widget gtktextview. it improves gtktextview by implementing syntax highlighting and other features typical of a source editor.

this package contains the language specifications files for ada, c, c++, c#, css, ".desktop", ".diff" (patch), fortran 95, gtkrc, haskell, html, idl, ".ini", java, javascript, latex, lua, msil, nemerle, pascal, perl, php, ".po" (gettext), python, r, ruby, sh, sql, tcl, texinfo, vb.net, verilog, vhdl and xml.