lib/standard: Stdin/out/err now part of Sys.

[nit.git] / src / nitx.nit

# This file is part of NIT ( http://www.nitlanguage.org ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# nit index, is a command tool used to display documentation
module nitx

import model_utils
import modelize_property

# Main class of the nit index tool
# NitIndex build the model using the toolcontext argument
# then wait for query on std in to display documentation
class NitIndex
        private var toolcontext: ToolContext
        private var model: Model
        private var mbuilder: ModelBuilder
        private var mainmodule: MModule
        private var arguments: Array[String]
        private var renderer: PagerMatchesRenderer

        # New constructor to use the pre-calculated model when interpreting a module
        init with_infos(mbuilder: ModelBuilder, mmodule: MModule) do

                self.model = mbuilder.model
                self.mbuilder = mbuilder

                self.mainmodule = mmodule
                self.toolcontext = mbuilder.toolcontext
                self.arguments = toolcontext.option_context.rest

                renderer = new PagerMatchesRenderer(self)
        end

        init(toolcontext: ToolContext) do
                # We need a model to collect stufs
                self.toolcontext = toolcontext
                self.arguments = toolcontext.option_context.rest

                if arguments.length > 2 then
                        print toolcontext.tooldescription
                        exit(1)
                end

                model = new Model
                mbuilder = new ModelBuilder(model, toolcontext)

                var mmodules = mbuilder.parse([arguments.first])
                if mmodules.is_empty then return
                mbuilder.run_phases
                assert mmodules.length == 1
                self.mainmodule = mmodules.first

                renderer = new PagerMatchesRenderer(self)
        end

        fun start do
                if arguments.length == 1 then
                        welcome
                        prompt
                else
                        search(arguments[1])
                end
        end

        fun welcome do
                print "Welcome in the Nit Index."
                print ""
                print "Loaded modules:"
                var mmodules = new Array[MModule]
                mmodules.add_all(model.mmodules)
                var sorter = new MModuleNameSorter
                sorter.sort(mmodules)
                for m in mmodules do
                        print "\t{m.name}"
                end
                print ""
                help
        end

        fun help do
                print "\nCommands:"
                print "\tname\t\tlookup module, class and property with the corresponding 'name'"
                print "\tparam: Type\tlookup methods using the corresponding 'Type' as parameter"
                print "\treturn: Type\tlookup methods returning the corresponding 'Type'"
                print "\tnew: Type\tlookup methods creating new instances of 'Type'"
                print "\t:h\t\tdisplay this help message"
                print "\t:q\t\texit"
                print ""
        end

        fun prompt do
                printn ">> "
                search(sys.stdin.read_line)
        end

        fun search(entry: String) do
                if entry.is_empty then
                        prompt
                        return
                end
                if entry == ":h" then
                        help
                        prompt
                        return
                end
                if entry == ":q" then return

                # Parse query string
                var query = parse_query(entry)

                # search in index
                var matches = new HashSet[IndexMatch]
                if query isa IndexQueryPair then
                        if query.category == "return" then
                                # seek return types
                                matches.add_all(search_returns(query))
                        else if query.category == "param" then
                                # seek param types
                                matches.add_all(search_params(query))
                        else if query.category == "new" then
                                # seek type inits
                                matches.add_all(search_inits(query))
                        end
                else
                        matches.add_all(search_modules(query))
                        matches.add_all(search_classes(query))
                        matches.add_all(search_properties(query))
                end
                # no matches
                if matches.is_empty then
                        print "Nothing known about '{query.string}', type ':h' for help"
                else
                        renderer.render_matches(query, matches)
                end
                if arguments.length == 1 then prompt
        end

        private fun parse_query(str: String): IndexQuery do
                var parts = str.split_with(":")
                if parts.length == 1 then
                        return new IndexQuery(str, parts[0])
                else
                        var category = parts[0]
                        var keyword = parts[1]
                        if keyword.chars.first == ' ' then keyword = keyword.substring_from(1)
                        return new IndexQueryPair(str, keyword, category)
                end
        end

        # search for modules
        private fun search_modules(query: IndexQuery): Set[MModule] do
                var matches = new HashSet[MModule]
                for mmodule in model.mmodules do
                        if mmodule.name == query.keyword then matches.add(mmodule)
                end
                return matches
        end

        # search for classes
        private fun search_classes(query: IndexQuery): Set[MClass] do
                var matches = new HashSet[MClass]
                for mclass in model.mclasses do
                        if mclass.name == query.keyword then matches.add(mclass)
                end
                return matches
        end

        # search for properties
        private fun search_properties(query: IndexQuery): Set[MProperty] do
                var matches = new HashSet[MProperty]
                for mproperty in model.mproperties do
                        if mproperty.name == query.keyword then matches.add(mproperty)
                end
                return matches
        end

        # search for mpropdef returning keyword
        private fun search_returns(query: IndexQuery): Set[MProperty] do
                var matches = new HashSet[MProperty]
                for mproperty in model.mproperties do
                        var intro = mproperty.intro
                        if intro isa MMethodDef then
                                if intro.msignature.return_mtype != null and intro.msignature.return_mtype.to_console.has_prefix(query.keyword) then matches.add(mproperty)
                        else if intro isa MAttributeDef then
                                if intro.static_mtype.to_console.has_prefix(query.keyword) then matches.add(mproperty)
                        end
                end
                return matches
        end

        # search for mpropdef taking keyword as parameter
        private fun search_params(query: IndexQuery): Set[MProperty] do
                var matches = new HashSet[MProperty]
                for mproperty in model.mproperties do
                        var intro = mproperty.intro
                        if intro isa MMethodDef then
                                var mparameters = intro.msignature.mparameters
                                for mparameter in mparameters do
                                        if mparameter.mtype.to_console.has_prefix(query.keyword) then matches.add(mproperty)
                                end
                        else if intro isa MAttributeDef then
                                if intro.static_mtype.to_console.has_prefix(query.keyword) then matches.add(mproperty)
                        end
                end
                return matches
        end

        # search for mpropdef creating new instance of keyword
        private fun search_inits(query: IndexQuery): Set[MPropDef] do
                var mtype2mpropdefs = toolcontext.nitx_phase.mtype2mpropdefs
                var matches = new HashSet[MPropDef]
                for mtype in mtype2mpropdefs.keys do
                        if mtype.to_console.has_prefix(query.keyword) then
                                for mpropdef in mtype2mpropdefs[mtype] do
                                        matches.add(mpropdef)
                                end
                        end
                end
                return matches
        end
end

private class IndexQuery
        var string: String
        var keyword: String
        init(string: String, keyword: String) do
                self.string = string
                self.keyword = keyword
        end
end

private class IndexQueryPair
        super IndexQuery
        var category: String
        init(string: String, keyword: String, category: String) do
                super(string, keyword)
                self.category = category
        end
end

# A match to a query in the nit index
private interface IndexMatch
        # Short preview of the result for result list display
        fun preview(index: NitIndex, output: Pager) is abstract
        fun content(index: NitIndex, output: Pager) is abstract
end

# Code Analysis

redef class ToolContext
        private var nitx_phase: NitxPhase = new NitxPhase(self, [modelize_property_phase])
end

# Compiler phase for nitx
private class NitxPhase
        super Phase

        var mtype2mpropdefs = new HashMap[MType, Set[MPropDef]]
        redef fun process_npropdef(npropdef) do
                var visitor = new TypeInitVisitor
                visitor.enter_visit(npropdef)
                for mtype in visitor.inits do
                        if not mtype2mpropdefs.has_key(mtype) then
                                mtype2mpropdefs[mtype] = new HashSet[MPropDef]
                        end
                        mtype2mpropdefs[mtype].add(npropdef.mpropdef.as(not null))
                end
        end
end

# Visitor looking for initialized mtype (new T)
private class TypeInitVisitor
        super Visitor

        var inits = new HashSet[MType]
        redef fun visit(node)
        do
                node.visit_all(self)
                # look for init
                if not node isa ANewExpr then return
                var mtype = node.n_type.mtype
                if mtype != null then inits.add(mtype)
        end
end

# Pager output for console

private class PagerMatchesRenderer
        var index: NitIndex
        init(index: NitIndex) do self.index = index

        fun render_matches(query: IndexQuery, matches: Collection[IndexMatch]) do
                var pager = new Pager
                if matches.length == 1 then
                        pager.add("= result for '{query.string}'".bold)
                        pager.add("")
                        pager.indent = pager.indent + 1
                        matches.first.content(index, pager)
                        pager.indent = pager.indent - 1
                else
                        pager.add("= multiple results for '{query.string}'".bold)
                        pager.indent = pager.indent + 1
                        for match in matches do
                                pager.add("")
                                match.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                pager.render
        end

        private fun props_fulldoc(pager: Pager, raw_mprops: List[MProperty]) do
                # group by module
                var cats = new HashMap[MModule, Array[MProperty]]
                for mprop in raw_mprops do
                        if mprop isa MAttribute then continue
                        var key = mprop.intro.mclassdef.mmodule
                        if not cats.has_key(key) then cats[key] = new Array[MProperty]
                        cats[key].add(mprop)
                end
                #sort groups
                var sorter = new MModuleNameSorter
                var sorted = new Array[MModule]
                sorted.add_all(cats.keys)
                sorter.sort(sorted)
                # display
                for mmodule in sorted do
                        var mprops = cats[mmodule]
                        pager.add("# matches in module {mmodule.namespace.bold}")
                        var sorterp = new MPropertyNameSorter
                        sorterp.sort(mprops)
                        for mprop in mprops do

                        end
                        pager.add_rule
                end
        end
end

private class Pager
        var content = new FlatBuffer
        var indent = 0
        fun add(text: String) do
                add_indent
                addn("{text}\n")
        end
        fun add_indent do addn("  " * indent)
        fun addn(text: String) do content.append(text.escape)
        fun add_rule do add("\n---\n")
        fun render do sys.system("echo \"{content}\" | pager -r")
end

redef class MModule
        super IndexMatch
        # prototype of the module
        #       module name
        private fun prototype: String do return "module {name.bold}"

        # namespace of the module
        #       project::name
        private fun namespace: String do
                if mgroup == null or mgroup.mproject.name == self.name then
                        return self.name
                else
                        return "{mgroup.mproject}::{self.name}"
                end
        end

        redef fun preview(index, pager) do
                var mdoc = self.mdoc
                if mdoc != null then
                        pager.add(mdoc.short_comment.green)
                end
                pager.add(prototype)
                pager.add("{namespace}".bold.gray + " (lines {location.lines})".gray)
        end

        redef fun content(index, pager) do
                var mdoc = self.mdoc
                if mdoc != null then
                        for comment in mdoc.content do pager.add(comment.green)
                end
                pager.add(prototype)
                pager.add("{namespace}".bold.gray + " (lines {location.lines})".gray)
                pager.indent = pager.indent + 1
                var sorter = new MModuleNameSorter
                # imported modules
                var imports = new Array[MModule]
                for mmodule in in_importation.direct_greaters.to_a do
                        imports.add(mmodule)
                end
                if not imports.is_empty then
                        sorter.sort(imports)
                        pager.add("")
                        pager.add("== imported modules".bold)
                        pager.indent = pager.indent + 1
                        for mmodule in imports do
                                pager.add("")
                                mmodule.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                # mclassdefs
                var csorter = new MClassDefNameSorter
                var intros = new Array[MClassDef]
                var redefs = new Array[MClassDef]
                for mclassdef in mclassdefs do
                        if mclassdef.is_intro then
                                intros.add(mclassdef)
                        else
                                redefs.add(mclassdef)
                        end
                end
                # introductions
                if not intros.is_empty then
                        csorter.sort(intros)
                        pager.add("")
                        pager.add("== introduced classes".bold)
                        pager.indent = pager.indent + 1
                        for mclass in intros do
                                pager.add("")
                                mclass.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                # refinements
                if not redefs.is_empty then
                        csorter.sort(redefs)
                        pager.add("")
                        pager.add("== refined classes".bold)
                        pager.indent = pager.indent + 1
                        for mclass in redefs do
                                pager.add("")
                                mclass.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                pager.indent = pager.indent - 1
        end
end

redef class MClass
        super IndexMatch
        # return the generic signature of the class
        #       [E, F]
        private fun signature: String do
                var res = new FlatBuffer
                if arity > 0 then
                        res.append("[")
                        for i in [0..intro.parameter_names.length[ do
                                res.append(intro.parameter_names[i])
                                if i < intro.parameter_names.length - 1 then res.append(", ")
                        end
                        res.append("]")
                end
                return res.to_s
        end

        # return the prototype of the class
        # class name is displayed with colors depending on visibility
        #       abstract interface Foo[E]
        private fun prototype: String do
                var res = new FlatBuffer
                res.append("{kind} ")
                if visibility.to_s == "public" then res.append("{name}{signature}".bold.green)
                if visibility.to_s == "private" then res.append("{name}{signature}".bold.red)
                if visibility.to_s == "protected" then res.append("{name}{signature}".bold.yellow)
                return res.to_s
        end

        private fun namespace: String do
                return "{intro_mmodule.namespace}::{name}"
        end

        redef fun preview(index, pager) do
                intro.preview(index, pager)
        end

        redef fun content(index, pager) do
                # intro comment
                var mdoc = intro.mdoc
                if mdoc != null then
                        for comment in mdoc.content do pager.add(comment.green)
                end
                pager.add(intro.to_console)
                pager.add("{intro.namespace}".bold.gray + " (lines {intro.location.lines})".gray)
                pager.indent = pager.indent + 1
                # parents
                var supers = self.in_hierarchy(index.mainmodule).direct_greaters.to_a
                if not supers.is_empty then
                        var csorter = new MClassNameSorter
                        csorter.sort(supers)
                        pager.add("")
                        pager.add("== supers".bold)
                        pager.indent = pager.indent + 1
                        for mclass in supers do
                                pager.add("")
                                mclass.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                # formal types
                if not self.parameter_types.is_empty then
                        pager.add("")
                        pager.add("== formal types".bold)
                        pager.indent = pager.indent + 1
                        for ft, bound in self.parameter_types do
                                pager.add("")
                                pager.add("{ft.to_s.bold.green}: {bound.to_console}")
                        end
                        pager.indent = pager.indent - 1
                end
                # intro mproperties
                var psorter = new MPropDefNameSorter
                var mpropdefs = intro.mpropdefs
                index.mainmodule.linearize_mpropdefs(mpropdefs)
                for cat in intro.cats2mpropdefs.keys do
                        var defs = intro.cats2mpropdefs[cat].to_a
                        if defs.is_empty then continue
                        psorter.sort(defs)
                        pager.add("")
                        pager.add("== {cat}".bold)
                        pager.indent = pager.indent + 1
                        for mpropdef in defs do
                                pager.add("")
                                mpropdef.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                # refinements
                if not self.mclassdefs.is_empty then
                        pager.add("")
                        pager.add("== refinements".bold)
                        var mclassdefs = self.mclassdefs
                        index.mainmodule.linearize_mclassdefs(mclassdefs)
                        pager.indent = pager.indent + 1
                        for mclassdef in mclassdefs do
                                if not mclassdef.is_intro then
                                        pager.add("")
                                        mclassdef.content(index, pager)
                                end
                        end
                        pager.indent = pager.indent - 1
                end
                pager.indent = pager.indent - 1
        end
end

redef class MClassDef
        super IndexMatch

        private fun namespace: String do
                return "{mmodule.full_name}::{mclass.name}"
        end

        fun to_console: String do
                var res = new FlatBuffer
                if not is_intro then res.append("redef ")
                res.append(mclass.prototype)
                return res.to_s
        end

        redef fun preview(index, pager) do
                var mdoc = self.mdoc
                if mdoc != null then
                        pager.add(mdoc.short_comment.green)
                end
                pager.add(to_console)
                pager.add("{namespace}".bold.gray + " (lines {location.lines})".gray)
        end

        redef fun content(index, pager) do
                var mdoc = self.mdoc
                if mdoc != null then
                        for comment in mdoc.content do pager.add(comment.green)
                end
                pager.add(to_console)
                pager.add("{namespace}".bold.gray + " (lines {location.lines})".gray)
                pager.indent = pager.indent + 1
                var mpropdefs = self.mpropdefs
                var psorter = new MPropDefNameSorter
                index.mainmodule.linearize_mpropdefs(mpropdefs)
                for cat in cats2mpropdefs.keys do
                        var defs = cats2mpropdefs[cat].to_a
                        psorter.sort(defs)
                        if defs.is_empty then continue
                        pager.add("")
                        pager.add("== {cat}".bold)
                        pager.indent = pager.indent + 1
                        for mpropdef in defs do
                                pager.add("")
                                mpropdef.preview(index, pager)
                        end
                        pager.indent = pager.indent - 1
                end
                pager.indent = pager.indent - 1
        end

        # get mpropdefs grouped by categories (vt, init, methods)
        fun cats2mpropdefs: Map[String, Set[MPropDef]] do
                var cats = new ArrayMap[String, Set[MPropDef]]
                cats["virtual types"] = new HashSet[MPropDef]
                cats["constructors"] = new HashSet[MPropDef]
                cats["methods"] = new HashSet[MPropDef]

                for mpropdef in mpropdefs do
                        if mpropdef isa MAttributeDef then continue
                        if mpropdef isa MVirtualTypeDef then cats["virtual types"].add(mpropdef)
                        if mpropdef isa MMethodDef then
                                if mpropdef.mproperty.is_init then
                                        cats["constructors"].add(mpropdef)
                                else
                                        cats["methods"].add(mpropdef)
                                end
                        end
                end
                return cats
        end
end

redef class MProperty
        super IndexMatch

        fun to_console: String do
                if visibility.to_s == "public" then return name.green
                if visibility.to_s == "private" then return name.red
                if visibility.to_s == "protected" then return name.yellow
                return name.bold
        end

        redef fun preview(index, pager) do
                intro.preview(index, pager)
        end

        redef fun content(index, pager) do
                intro.content(index, pager)
                pager.indent = pager.indent + 1
                var mpropdefs = self.mpropdefs
                index.mainmodule.linearize_mpropdefs(mpropdefs)
                for mpropdef in mpropdefs do
                        if mpropdef isa MAttributeDef then continue
                        if not mpropdef.is_intro then
                                pager.add("")
                                mpropdef.preview(index, pager)
                        end
                end
                pager.indent = pager.indent - 1
        end
end

redef class MPropDef
        super IndexMatch

        fun to_console: String is abstract

        private fun namespace: String do
                return "{mclassdef.namespace}::{mproperty.name}"
        end

        redef fun preview(index, pager) do
                var mdoc = self.mdoc
                if mdoc != null then
                        pager.add(mdoc.short_comment.green)
                end
                pager.add(to_console)
                pager.add("{namespace}".bold.gray + " (lines {location.lines})".gray)
        end

        redef fun content(index, pager) do
                var mdoc = self.mdoc
                if mdoc != null then
                        for comment in mdoc.content do pager.add(comment.green)
                end
                pager.add(to_console)
                pager.add("{namespace}".bold.gray + " (lines {location.lines})".gray)
        end
end

redef class MMethodDef
        redef fun to_console do
                var res = new FlatBuffer
                if not is_intro then res.append("redef ")
                if not mproperty.is_init then res.append("fun ")
                res.append(mproperty.to_console.bold)
                if msignature != null then res.append(msignature.to_console)
                # FIXME: modifiers should be accessible via the model
                #if self isa ADeferredMethPropdef then ret = "{ret} is abstract"
                #if self isa AInternMethPropdef then ret = "{ret} is intern"
                #if self isa AExternMethPropdef then ret = "{ret} is extern"
                return res.to_s
        end
end

redef class MVirtualTypeDef
        redef fun to_console do
                var res = new FlatBuffer
                res.append("type ")
                res.append(mproperty.to_console.bold)
                res.append(": {bound.to_console}")
                return res.to_s
        end
end

redef class MAttributeDef
        redef fun to_console do
                var res = new FlatBuffer
                res.append("var ")
                res.append(mproperty.to_console.bold)
                res.append(": {static_mtype.to_console}")
                return res.to_s
        end
end

redef class MSignature
        redef fun to_console do
                var res = new FlatBuffer
                if not mparameters.is_empty then
                        res.append("(")
                        for i in [0..mparameters.length[ do
                                res.append(mparameters[i].to_console)
                                if i < mparameters.length - 1 then res.append(", ")
                        end
                        res.append(")")
                end
                if return_mtype != null then
                        res.append(": {return_mtype.to_console}")
                end
                return res.to_s
        end
end

redef class MParameter
        fun to_console: String do
                var res = new FlatBuffer
                res.append("{name}: {mtype.to_console}")
                if is_vararg then res.append("...")
                return res.to_s
        end
end

redef class MType
        fun to_console: String do return self.to_s
end

redef class MNullableType
        redef fun to_console do return "nullable {mtype.to_console}"
end

redef class MGenericType
        redef fun to_console do
                var res = new FlatBuffer
                res.append("{mclass.name}[")
                for i in [0..arguments.length[ do
                        res.append(arguments[i].to_console)
                        if i < arguments.length - 1 then res.append(", ")
                end
                res.append("]")
                return res.to_s
        end
end

redef class MParameterType
        redef fun to_console do return mclass.intro.parameter_names[rank]
end

redef class MVirtualType
        redef fun to_console do return mproperty.name
end

redef class MDoc
        private fun short_comment: String do
                return content.first
        end
end

redef class AAttrPropdef
        private fun read_accessor: String do
                var ret = "fun "
                #FIXME bug with standard::stream::FDStream::fd
                var name = mreadpropdef.mproperty.name
                if mpropdef.mproperty.visibility.to_s == "public" then ret = "{ret}{name.green}"
                if mpropdef.mproperty.visibility.to_s == "private" then ret = "{ret}{name.red}"
                if mpropdef.mproperty.visibility.to_s == "protected" then ret = "{ret}{name.yellow}"
                ret = "{ret}: {n_type.to_s}"
                if n_kwredef != null then ret = "redef {ret}"
                return ret
        end

        private fun write_accessor: String do
                var ret = "fun "
                var name = "{mreadpropdef.mproperty.name}="
                if n_readable != null and n_readable.n_visibility != null then
                        if n_readable.n_visibility isa APublicVisibility then ret = "{ret}{name.green}"
                        if n_readable.n_visibility isa APrivateVisibility then ret = "{ret}{name.red}"
                        if n_readable.n_visibility isa AProtectedVisibility then ret = "{ret}{name.yellow}"
                else
                        ret = "{ret}{name.red}"
                end
                ret = "{ret}({mreadpropdef.mproperty.name}: {n_type.to_s})"
                if n_kwredef != null then ret = "redef {ret}"
                return ret
        end
end

# Redef String class to add a function to color the string
redef class String

        private fun add_escape_char(escapechar: String): String do
                return "{escapechar}{self}\\033[0m"
        end

        private fun esc: Char do return 27.ascii
        private fun gray: String do return add_escape_char("{esc}[30m")
        private fun red: String do return add_escape_char("{esc}[31m")
        private fun green: String do return add_escape_char("{esc}[32m")
        private fun yellow: String do return add_escape_char("{esc}[33m")
        private fun blue: String do return add_escape_char("{esc}[34m")
        private fun purple: String do return add_escape_char("{esc}[35m")
        private fun cyan: String do return add_escape_char("{esc}[36m")
        private fun light_gray: String do return add_escape_char("{esc}[37m")
        private fun bold: String do return add_escape_char("{esc}[1m")
        private fun underline: String do return add_escape_char("{esc}[4m")

        private fun escape: String
        do
                var b = new FlatBuffer
                for c in self.chars do
                        if c == '\n' then
                                b.append("\\n")
                        else if c == '\0' then
                                b.append("\\0")
                        else if c == '"' then
                                b.append("\\\"")
                        else if c == '\\' then
                                b.append("\\\\")
                        else if c == '`' then
                                b.append("'")
                        else if c.ascii < 32 then
                                b.append("\\{c.ascii.to_base(8, false)}")
                        else
                                b.add(c)
                        end
                end
                return b.to_s
        end
end

redef class Location
        fun lines: String do
                return "{line_start}-{line_end}"
        end
end

# Create a tool context to handle options and paths
var toolcontext = new ToolContext
toolcontext.tooldescription = "Usage: nitx [OPTION]... <file.nit> [query]\nDisplays specific pieces of API information from Nit source files."
toolcontext.process_options(args)

# Here we launch the nit index
var ni = new NitIndex(toolcontext)
ni.start

# TODO seek subclasses and super classes <.<class> >.<class>
# TODO seek subclasses and super types <:<type> >:<type>
# TODO seek with regexp
# TODO standardize namespaces with private option