文件操作 #

content = read("file.txt", String)

for line in eachline("file.txt")
    println(line)
end

lines = readlines("file.txt")

open("output.txt", "w") do f
    write(f, "Hello, Julia!\n")
    println(f, "Another line")
end

open("output.txt", "a") do f
    println(f, "Appended line")
end

f = open("file.txt", "r")
content = read(f, String)
close(f)

open("file.txt", "r") do f
    content = read(f, String)
    println(content)
end

data = read("file.bin")

open("output.bin", "w") do f
    write(f, [0x01, 0x02, 0x03, 0x04])
end

open("data.bin", "r") do f
    n = read(f, Int32)
    arr = read(f, Float64, n)
end

s = stat("file.txt")
s.size
s.mtime
s.mode
isfile("file.txt")
isdir("directory")

mkdir("new_directory")
mkpath("path/to/directory")

rm("file.txt")
rm("directory", recursive=true)

cp("source.txt", "dest.txt")
mv("old.txt", "new.txt")

mv("old_name.txt", "new_name.txt")

joinpath("path", "to", "file.txt")

dirname("/path/to/file.txt")
basename("/path/to/file.txt")
splitext("file.txt")

pwd()
cd("/new/path")
homedir()

readdir(".")
readdir("/path/to/directory")

using CSV, DataFrames

df = CSV.read("data.csv", DataFrame)
CSV.write("output.csv", df)

using JSON

data = JSON.parsefile("data.json")
JSON.print("output.json", data)

function write_log(filename, message)
    timestamp = Dates.format(now(), "yyyy-mm-dd HH:MM:SS")
    open(filename, "a") do f
        println(f, "[$timestamp] $message")
    end
end

using Dates
write_log("app.log", "Application started")
write_log("app.log", "Processing data")

function load_config(filename)
    config = Dict{String, String}()
    for line in eachline(filename)
        line = strip(line)
        isempty(line) || startswith(line, '#') && continue
        key, value = split(line, "=", limit=2)
        config[strip(key)] = strip(value)
    end
    return config
end

function save_config(filename, config)
    open(filename, "w") do f
        for (key, value) in config
            println(f, "$key = $value")
        end
    end
end

function find_files(directory, pattern)
    results = String[]
    for (root, dirs, files) in walkdir(directory)
        for file in files
            if occursin(pattern, file)
                push!(results, joinpath(root, file))
            end
        end
    end
    return results
end

find_files(".", r"\.jl$")