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luaでlinuxのコマンドを実行する

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luaで外部コマンドの実行結果を取得する方法です。popenを使うとコマンドの結果がとれるようです。
文字列をテーブルに変換する処理がなかったので、splitを書いてみました。

sample.lua
function split(str, delim)                                                                                                                                    
        assert(str,  "文字列が設定されていません")
        assert(delim,"区切り文字がしていされていません")
        local pattern = "[^"..delim.."]*"..delim

        local result = {}
        for item in string.gmatch(str, pattern) do
                local tmp = item:gsub(delim,"")
                table.insert(result, tmp)
        end 
        return result
end

function getPid(name)
        local command='pidof '..name
        local commandResult = execCommand(command)
        local result = string.gsub(commandResult, "\n", "") 
        return  result
end

function getDirList(dirname)
        local command='find '..dirname..' -type d'
        local commandResult = execCommand(command)
        local result = string.gsub(commandResult, "\n", ",")
        return split(result, ",")
end

function execCommand(command)
        local handle = io.popen(command,"r")
        local content = handle:read("*all")
        handle:close()
        return content
end
hidetzu
組み込みプログラマからWeb系プログラマまでなんでもやってます。 Vue.js, Nuxt.js, Goが好き。
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