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##[
internal API for now, API subject to change
]##
import std/[os,osproc,sugar,strutils]
proc actionRetry*(maxRetry: int, backoffDuration: float, action: proc(): bool): bool =
## retry `action` up to `maxRetry` times with exponential backoff and initial
## duraton of `backoffDuration` seconds
var t = backoffDuration
for i in 0..<maxRetry:
if action(): return true
if i == maxRetry - 1: break
sleep(int(t * 1000))
t = t * 2 # exponential backoff
return false
proc nimbleInstall*(name: string, message: var string): bool =
let cmd = "nimble install -y " & name
let (outp, status) = execCmdEx(cmd)
if status != 0:
message = "'$1' failed:\n$2" % [cmd, outp]
result = false
else: result = true
when isMainModule:
block:
var msg: string
let ok = actionRetry(maxRetry = 2, backoffDuration = 0.1):
(proc(): bool = nimbleInstall("nonexistant", msg))
doAssert "Package not found" in msg
doAssert not ok
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