Xah Talk Show 2021-11-08 x-bows keyboard, WolframLang for unix grep, emacs xah-wolfram-mode

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• Difference Between WolframLang, Mathematica, WolframEngine, WolframScript
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• WolframLang: Syntax, Operators Cheatsheet

#!/usr/bin/env wolframscript

executable = $ScriptCommandLine[[1]]

If[Length[$ScriptCommandLine] != 3,
  Print["USAGE:"]
  Print[executable, " PATTERN PATH"]
  Exit[1]
]

pattern = $ScriptCommandLine[[2]]
path = $ScriptCommandLine[[3]]

addIndices[list_] := MapIndexed[{First[#2], #1}&, list]
lines[text_] := StringSplit[text, {"\r\n", "\r", "\n"}] // addIndices
matchingLines[text_] := Select[lines[text], StringContainsQ[#[[2]], pattern]&]
printLine[{number_, contents_}] := Print[number, "\t", contents]

printIfMatch[file_] :=
  With[{contents = ReadString[file]},
    If[StringContainsQ[contents, pattern],
      Print[file]
      Scan[printLine, matchingLines[contents]]
      Print[]
    ]
  ]

FileSystemScan[printIfMatch, path]

xah_talk_show_2021-11-08.txt