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63 lines
2.3 KiB
Nim
63 lines
2.3 KiB
Nim
##[
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internal API for now, API subject to change
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]##
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# xxx move other git utilities here; candidate for stdlib.
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import std/[os, osproc, strutils, tempfiles]
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const commitHead* = "HEAD"
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template retryCall*(maxRetry = 3, backoffDuration = 1.0, call: untyped): bool =
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## Retry `call` up to `maxRetry` times with exponential backoff and initial
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## duraton of `backoffDuration` seconds.
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## This is in particular useful for network commands that can fail.
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runnableExamples:
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doAssert not retryCall(maxRetry = 2, backoffDuration = 0.1, false)
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var i = 0
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doAssert: retryCall(maxRetry = 3, backoffDuration = 0.1, (i.inc; i >= 3))
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doAssert retryCall(call = true)
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var result = false
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var t = backoffDuration
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for i in 0..<maxRetry:
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if call:
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result = true
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break
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if i == maxRetry - 1: break
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sleep(int(t * 1000))
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t = t * 2 # exponential backoff
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result
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proc isGitRepo*(dir: string): bool =
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## This command is used to get the relative path to the root of the repository.
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## Using this, we can verify whether a folder is a git repository by checking
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## whether the command success and if the output is empty.
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let (output, status) = execCmdEx("git rev-parse --show-cdup", workingDir = dir)
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# On Windows there will be a trailing newline on success, remove it.
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# The value of a successful call typically won't have a whitespace (it's
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# usually a series of ../), so we know that it's safe to unconditionally
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# remove trailing whitespaces from the result.
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result = status == 0 and output.strip() == ""
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proc diffStrings*(a, b: string): string =
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runnableExamples:
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let a = "ok1\nok2\nok3"
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let b = "ok1\nok2 alt\nok3"
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let c = diffStrings(a, b)
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echo c
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template tmpFileImpl(prefix, str): auto =
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# pending https://github.com/nim-lang/Nim/pull/17889
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# let (fd, path) = createTempFile(prefix, "")
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let path = genTempPath(prefix, "")
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defer:
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removeFile(path)
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writeFile(path, str)
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(fd, path)
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let (fda, patha) = tmpFileImpl("diffStrings_a", a)
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let (fdb, pathb) = tmpFileImpl("diffStrings_b", b)
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# could be customized, e.g. non-git diff with `diff -uNdr`, or with git diff options.
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var status = 0
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(result, status) = execCmdEx("git diff --no-index $1 $2" % [patha.quoteShell, pathb.quoteShell])
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echo status
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