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import std / [
macros,
strformat,
strutils
]
macro tessera*(packageName: untyped, body: untyped): untyped =
## Small declerative DSL for defining packages
## The schema is:
## package "name":
## source: "<url>"
## patches: @[...] (if any)
## dependencies: @[...] (if any)
## build: @[...]
## result: @[...]
##
## The macro expands at compile time into a build() procedure.
## When run it:
## - verifies the `dependencies` are installed properly
## ( this rn means that it checks $PATH,
## since I haven't worked on mosaic yet )
## ( if a dependency isn't installed, it installs it )
## - uses cURL to fetch the tarball from the `sourceURL`
## - extracts the tarball, and cd's into it
## - applies `patches` (if any)
## - runs the build commands defined in `build: @[...]`
if packageName.kind == nnkIdent:
error("Name of package must be a string: {packageName}->\"{packageName}\"")
body.expectKind nnkStmtList
var
nameLit = newLit($toStrLit(packageName))
sourceNode = newLit("")
patchesNode = newLit(newSeq[string]())
depsNode = newLit(newSeq[string]())
buildNode = newLit(newSeq[string]())
resultNode = newLit("")
for stmt in body:
if stmt.kind == nnkCall:
let key = $stmt[0]
let value = stmt[1]
case key:
of "source": sourceNode = value
of "patches": patchesNode = value
of "dependencies": depsNode = value
of "build": buildNode = value
of "result": resultNode = value
else:
error("tessera: unknown field {key}".fmt)
else:
error("tessera: unexpected statement in package block: {stmt.repr}".fmt)
let buildIdent = ident("build_{packageName}".fmt)
result = quote do:
import os, osproc, strutils
const
pkgName = `nameLit`
pkgSource = `sourceNode`
pkgPatches = `patchesNode`
pkgDeps = `depsNode`
pkgBuild = `buildNode`
pkgResult = `resultNode`
# Helper procs
proc extractFilename(url: string): string =
if url.len == 0:
return ""
let parts = url.split('/')
result = parts[^1]
proc stripExtension(filename: string): string =
result = filename
# list of tar suffixes from Wikipedia
let suffixList = @[
".tar.gz",
".tar.xz",
".tar.bz2",
".tar.lz",
".tar.lzma",
".tar.lzo",
".tar.Z",
".tar.zst",
".tb2",
".tbz",
".tbz2",
".tz2",
".taz",
".tgz",
".tlz",
".txz",
".tZ",
".taZ",
".tzst"
]
for suffix in suffixList:
if result.endsWith(suffix):
result.removeSuffix(suffix)
proc runCommand(command: string, workingDir: string = ""): string =
echo "Running command: " & command
let (output, exitCode) = execCmdEx(command, workingDir=workingDir)
if exitCode != 0:
quit("Command failed with exit code: \"" & $exitCode & "\":\n" & $output)
result = output
proc isExecutable(filename: string): bool =
let permissions = getFilePermissions(filename)
result = ((fpUserExec in permissions) or (fpGroupExec in permissions))
proc isInstalled(name: string): bool =
result = false
let possibleFolders = @["/usr/bin/", "/usr/sbin/", "/usr/lib/"]
for folder in possibleFolders:
if fileExists(folder & name):
result = true
# TODO: Make this not depend on the tar file
proc ensureDependency(dependency: string, tarFile: string) =
if dependency.len > 0:
# TODO: When I fix the declerativeness, I must also fix this
let localInstaller = "/mosaic/panel/" & $dependency
echo "checking " & localInstaller & "..."
if not (fileExists(localInstaller) or isExecutable(localInstaller)):
quit("dependency \"" & $dependency & "\" not defined yet.")
let output = runCommand("/mosaic/panel/" & $dependency)
echo output
proc `buildIdent`() =
echo "Building " & $pkgName
let
mosaicSourceFolder = "/mosaic/quarry/"
sourceFile = $mosaicSourceFolder & extractFilename(url=pkgSource)
# Step 1: check dependencies
if isInstalled(pkgResult):
echo pkgName & " already installed..."
return
if pkgDeps.len > 0:
for dependency in pkgDeps:
echo "checking dependency: " & $dependency
ensureDependency(dependency=dependency, tarFile=sourceFile)
# Step 2: fetch source via cURL
var expectedFolder = stripExtension(sourceFile) & "/"
echo "Making " & expectedFolder & "..."
createDir(expectedFolder)
if not fileExists(sourceFile):
echo "Fetching source: " & $pkgSource & " -> " & sourceFile
let wgetOutput = runCommand(command="wget " & $pkgSource, workingDir=mosaicSourceFolder)
echo "wget " & wgetOutput
else:
echo $sourceFile & " exists. Continuing..."
# Step 3: untar
echo "extracting " & $sourceFile & "..."
let tarOutput = runCommand(command="tar -xf " & $sourceFile, workingDir=mosaicSourceFolder)
echo tarOutput
var untarFolders: seq[string] = @[]
for folder in walkDir(expectedFolder):
untarFolders.add(folder.path)
echo untarFolders
if untarFolders.len == 0:
quit("No folders produces in untarring step (?)... Quitting...")
if untarFolders.len == 1:
expectedFolder = untarFolders[0]
# Step 5
if pkgPatches.len > 0:
for patchURL in pkgPatches:
if patchURL.len > 0:
let patchFile = extractFilename(url=patchURL)
echo "Fetching patch: " & $patchURL & " -> " & $patchFile
let wgetPatchOutput = runCommand(command="wget " & $patchURL, workingDir=mosaicSourceFolder)
echo wgetPatchOutput
assert fileExists(patchFile)
# Step 6: Run the build commands:
if pkgBuild.len == 0:
quit("No commands given to run for " & $pkgName & "... Nothing to do.")
var newWorkingFolder = expectedFolder
echo newWorkingFolder
for command in pkgBuild:
echo command
if command.startsWith("cd "):
newWorkingFolder = newWorkingFolder & command[3..^1]
continue
let buildOutput = runCommand(command=command, workingDir=newWorkingFolder)
echo buildOutput
echo "tessera " & $pkgName & "built."
when isMainModule:
`buildIdent`()
|
