Read hits from evt files

src/KM3io.jl

 module KM3io
 
-greet() = print("Hello World!")
+using Corpuscles
+
+abstract type AbstractHit end
+
+struct RawHit <: AbstractHit
+    id::Integer
+    PMid::Integer
+    pe::Integer
+    time::Integer
+end
+
+struct Hit <: AbstractHit
+    id::Integer
+    PMid::Integer
+    npe::Real
+    time::Real
+    particle::GeantID
+    track_id::Integer
+end
+
+struct Event
+    hits::Vector{AbstractHit}
+end
+Event() = Event(Vector{AbstractHit}())
+
+struct EvtFile
+    events::Dict{T, Event} where {T <: Integer}
+end
+
+EvtFile() = EvtFile(Dict{Int64, Event}())
+
+function read_hit_entry(line::AbstractString)
+    fields = split(line)
+    id = parse(Int64, fields[2])
+    pmt_id = parse(Int64, fields[3])
+    npe = parse(Float64, fields[4])
+    time = parse(Float64, fields[5])
+    geantid = GeantID(parse(Int64, fields[6]))
+    track_id = parse(Int64, fields[7])
+    Hit(id, pmt_id, npe, time, geantid, track_id)
+end
+
+
+function read_evt_file(filepath::AbstractString)
+    f = open(filepath)
+    evtfile = EvtFile()
+    while !eof(f)
+        line = readline(f)
+        if occursin("start_event:", line)
+            fields = split(line)
+            eventid = parse(Int64, fields[2])
+            event = Event()
+            evtfile.events[eventid] = event
+            while !occursin("end_event:", line)
+                line = readline(f)
+                if occursin("hit:", line)
+                    hit = read_hit_entry(line)
+                    push!(event.hits, hit)
+                end
+            end
+        end
+    end
+    return evtfile
+end 
+
+EvtFile(filepath::AbstractString) = read_evt_file(filepath)
 
 end # module