From 3faa7e763c9fbc93edca6aece732dfd2674fdc50 Mon Sep 17 00:00:00 2001
From: kitsunyan
Date: Sun, 10 Jun 2018 06:46:10 +0300
Subject: Handle dependencies/explicits using "pacman -D" instead of two
 "pacman -S" calls

---
 lib/install.nim | 66 ++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 49 insertions(+), 17 deletions(-)

(limited to 'lib')

diff --git a/lib/install.nim b/lib/install.nim
index 9539a62..03bebd5 100644
--- a/lib/install.nim
+++ b/lib/install.nim
@@ -1,4 +1,4 @@
-import future, os, posix, strutils
+import future, os, posix, sequtils, strutils
 
 proc splitCommands(params: seq[string], index: int, res: seq[seq[string]]): seq[seq[string]] =
   if index < params.len:
@@ -11,10 +11,15 @@ proc splitCommands(params: seq[string], index: int, res: seq[seq[string]]): seq[
 proc perror*(s: cstring): void {.importc, header: "<stdio.h>".}
 template perror*: void = perror(paramStr(0))
 
-proc runCommand(params: seq[string]): int =
+proc runCommand(params: seq[string], inputOutput: bool): int =
   if params.len > 0:
     let pid = fork()
     if pid == 0:
+      if not inputOutput:
+        discard close(0)
+        discard close(1)
+        discard open("/dev/null")
+        discard open("/dev/null")
       let cexec = allocCStringArray(params)
       let code = execvp(cexec[0], cexec)
       perror()
@@ -31,31 +36,58 @@ proc runCommand(params: seq[string]): int =
   else:
     0
 
-proc buildParams(commands: seq[seq[string]], index: int, asArg: string): seq[string] =
-  if commands[index].len > 0: commands[0] & asArg & "--" & commands[index] else: @[]
+proc take(params: seq[string], start: int, count: int): (seq[string], int) =
+  let res = params[start .. start + count - 1]
+  (res, start + count)
 
 proc handleInstall*(params: seq[string]): int =
-  let destination = params[0]
-  let uid = params[1].parseInt
-  let gid = params[2].parseInt
-  let paramsStart = 3
+  let (head, headIndex) = params.take(0, 3)
+  let destination = head[0]
+  let uid = head[1].parseInt
+  let gid = head[2].parseInt
 
-  let commands = splitCommands(params, paramsStart, @[])
-  let targets = lc[x | (y <- commands[1 .. ^1], x <- y), string]
+  let (upgradeCommand, upgradeIndex) = params
+    .take(headIndex + 1, params[headIndex].parseInt)
+  let (databaseCommand, databaseIndex) = params
+    .take(upgradeIndex + 1, params[upgradeIndex].parseInt)
+
+  let packages = params[databaseIndex .. ^1]
+  if packages.len /% 3 * 3 != packages.len:
+    raise newException(SystemError, "invalid arguments")
+
+  let install: seq[tuple[name: string, file: string, mode: string]] = packages
+    .distribute(packages.len /% 3)
+    .map(l => (l[0], l[1], l[2]))
 
   if uid >= 0 and gid >= 0:
-    for file in targets:
+    for pkg in install:
       try:
-        let index = file.rfind("/")
-        let name = if index >= 0: file[index + 1 .. ^1] else: file
+        let index = pkg.file.rfind("/")
+        let name = if index >= 0: pkg.file[index + 1 .. ^1] else: pkg.file
         let dest = destination & "/" & name
-        copyFile(file, dest)
+        copyFile(pkg.file, dest)
         discard chown(dest, (Uid) uid, (Gid) gid)
       except:
         discard
 
-  let asdepsCode = runCommand(commands.buildParams(1, "--asdeps"))
-  if asdepsCode == 0:
-    runCommand(commands.buildParams(2, "--asexplicit"))
+  let asexplicit = install.filter(p => p.mode == "explicit").map(p => p.name)
+  let asdeps = install.filter(p => p.mode == "dependency").map(p => p.name)
+
+  let installCode = runCommand(upgradeCommand & "--" & install.map(p => p.file), true)
+
+  let asexplicitCode = if asexplicit.len > 0:
+      runCommand(databaseCommand & "--asexplicit" & "--" & asexplicit, false)
+    else:
+      0
+
+  let asdepsCode = if asdeps.len > 0:
+      runCommand(databaseCommand & "--asdeps" & "--" & asdeps, false)
+    else:
+      0
+
+  if installCode != 0:
+    installCode
+  elif asexplicitCode != 0:
+    asexplicitCode
   else:
     asdepsCode
-- 
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