Init project

Author: terasakisatoshi

Project.toml

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+name = "TerminalSystemMonitor"
+uuid = "bd0a793d-05ca-4aa9-be12-7c4786d45f63"
+authors = ["Satoshi Terasaki <[email protected]>"]
+version = "0.1.0"
+
+[deps]
+Term = "22787eb5-b846-44ae-b979-8e399b8463ab"
+UnicodePlots = "b8865327-cd53-5732-bb35-84acbb429228"

main.jl

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+using TerminalSystemMonitor: main
+
+if abspath(PROGRAM_FILE) == @__FILE__
+    Base.exit_on_sigint(false)
+    main()
+end

src/TerminalSystemMonitor.jl

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+module TerminalSystemMonitor
+
+#=
+                              CPU Usage
+          ┌                                               ┐
+    id: 0 ┤■■■■■■■■■■ 23
+    id: 1 ┤ 0
+    id: 2 ┤■■■■■ 11.1111
+    id: 3 ┤ 0
+    id: 4 ┤■■ 5.05051
+    id: 5 ┤ 0
+    id: 6 ┤■ 3
+    id: 7 ┤ 0
+    id: 8 ┤ 1
+    id: 9 ┤ 0
+   id: 10 ┤ 0
+   id: 11 ┤ 0
+   id: 12 ┤ 0
+   id: 13 ┤ 0
+   id: 14 ┤ 0
+   id: 15 ┤ 0
+          └                                               ┘
+=#
+
+using UnicodePlots
+using Term
+
+idle_time(info::Sys.CPUinfo) = Int64(info.cpu_times!idle)
+
+busy_time(info::Sys.CPUinfo) = Int64(
+    info.cpu_times!user + info.cpu_times!nice + info.cpu_times!sys + info.cpu_times!irq,
+)
+
+"""
+    cpu_percent(period)
+
+CPU usage between 0.0 and 100 [percent]
+The idea is borrowed from https://discourse.julialang.org/t/get-cpu-usage/24468/7
+Thank you @fonsp.
+"""
+function cpu_percent(period::Real=1.0)
+
+    info = Sys.cpu_info()
+    busies = busy_time.(info)
+    idles = idle_time.(info)
+
+    sleep(period)
+
+    info = Sys.cpu_info()
+    busies = busy_time.(info) .- busies
+    idles = idle_time.(info) .- idles
+
+    100 * busies ./ (idles .+ busies)
+end
+
+function clearline(; move_up::Bool=false)
+    buf = IOBuffer()
+    print(buf, "\x1b[2K") # clear line
+    print(buf, "\x1b[999D") # rollback the cursor
+    move_up && print(buf, "\x1b[1A") # move up
+    print(buf |> take! |> String)
+end
+
+function clearlines(H::Integer)
+    for i = 1:H
+        clearline(move_up=true)
+    end
+end
+
+function hidecursor()
+    print("\x1b[?25l") # hidecursor
+end
+
+function unhidecursor()
+    print("\u001B[?25h") # unhide cursor
+end
+
+function layout(x, y)
+    ncpus = length(y)
+    y = round.(y, digits=1)
+    _, cols = displaysize(stdout)
+
+    plts = []
+
+    chunks = collect.(collect(Iterators.partition((1:ncpus), 4)))
+    for c in chunks
+        push!(
+            plts,
+            barplot(
+                x[c], y[c],
+                # title="CPU Usage",
+                maximum=100, width=max(5, 15), height=length(c),
+            )
+        )
+    end
+
+    n = max(1, cols ÷ 25)
+    chunks = collect(Iterators.partition(plts, n))
+
+    foldl(/, map(c->prod(UnicodePlots.panel.(c)), chunks))
+
+    chunks = collect(Iterators.partition(plts, n))
+
+    canvas = foldl(/, map(c->prod(UnicodePlots.panel.(c)), chunks))
+
+    memoryusage = round((Sys.total_memory() - Sys.free_memory()) / 2 ^ 20 / 1000, digits=1)
+
+    canvas / UnicodePlots.panel(barplot(
+        ["Mem: "], 
+        [memoryusage],
+        title="Memmory $(memoryusage)/$(floor(Sys.total_memory()/2^20 / 1000)) GB",
+        maximum=Sys.total_memory()/2^20 / 1000, width=max(10, 40)
+    ))
+end
+
+
+function main()
+    hidecursor()
+    while true
+        try
+            y = cpu_percent()
+            x = ["id: $(i-1)" for (i, _) in enumerate(y)]
+            (_, cols) = displaysize(stdout)
+
+            # f = barplot(x, y, title="CPU Usage", maximum=100, width=max(10, cols - 15), height=length(y))
+            f = layout(x, y)
+            str = string(f)
+            clearlines(2 + length(collect(eachmatch(r"\n", str))))
+            display(f)
+        catch e
+            unhidecursor() # unhide cursor
+            if e isa InterruptException
+                @info "Intrrupted"
+                break
+            else
+                @warn "Got Exception"
+                rethrow(e) # so we don't swallow true exceptions
+            end
+        end
+    end
+    @info "Unhide cursor"
+    unhidecursor() # unhide cursor
+end
+
+end # module TerminalSystemMonitor