Merge remote-tracking branch 'nim-lang/devel' into emscripten-support

compiler/extccomp.nim

@@ -474,7 +474,7 @@ proc execWithEcho(cmd: string, msg = hintExecuting): int =
 
 proc execExternalProgram*(cmd: string, msg = hintExecuting) =
   if execWithEcho(cmd, msg) != 0:
-    rawMessage(errExecutionOfProgramFailed, "")
+    rawMessage(errExecutionOfProgramFailed, cmd)
 
 proc generateScript(projectFile: string, script: Rope) =
   let (dir, name, ext) = splitFile(projectFile)
@@ -680,7 +680,7 @@ proc callCCompiler*(projectfile: string) =
     if gNumberOfProcessors <= 1:
       for i in countup(0, high(cmds)):
         res = execWithEcho(cmds[i])
-        if res != 0: rawMessage(errExecutionOfProgramFailed, [])
+        if res != 0: rawMessage(errExecutionOfProgramFailed, cmds[i])
     elif optListCmd in gGlobalOptions or gVerbosity > 1:
       res = execProcesses(cmds, {poEchoCmd, poUsePath, poParentStreams},
                           gNumberOfProcessors)
@@ -692,9 +692,11 @@ proc callCCompiler*(projectfile: string) =
                           gNumberOfProcessors)
     if res != 0:
       if gNumberOfProcessors <= 1:
-        rawMessage(errExecutionOfProgramFailed, [])
+        rawMessage(errExecutionOfProgramFailed, cmds.join())
       else:
-        rawMessage(errGenerated, " execution of an external program failed; " &
+        rawMessage(errGenerated,
+                   " execution of an external compiler program failed: " &
+                   cmds.join() & "; " &
                    "rerun with --parallelBuild:1 to see the error message")
   if optNoLinking notin gGlobalOptions:
     # call the linker:

compiler/msgs.nim

@@ -203,7 +203,7 @@ const
     errUseQualifier: "ambiguous identifier: \'$1\' -- use a qualifier",
     errTypeExpected: "type expected",
     errSystemNeeds: "system module needs \'$1\'",
-    errExecutionOfProgramFailed: "execution of an external program failed",
+    errExecutionOfProgramFailed: "execution of an external program failed: '$1'",
     errNotOverloadable: "overloaded \'$1\' leads to ambiguous calls",
     errInvalidArgForX: "invalid argument for \'$1\'",
     errStmtHasNoEffect: "statement has no effect",

lib/pure/streams.nim

@@ -11,6 +11,26 @@
 ## the `FileStream` and the `StringStream` which implement the stream
 ## interface for Nim file objects (`File`) and strings. Other modules
 ## may provide other implementations for this standard stream interface.
+##
+## Examples:
+##
+## .. code-block:: Nim
+##
+##  import streams
+##  var
+##    ss = newStringStream("""The first line
+##  the second line
+##  the third line""")
+##    line = ""
+##  while ss.readLine(line):
+##    echo line
+##  ss.close()
+##
+##  var fs = newFileStream("somefile.txt", fmRead)
+##  if not isNil(fs):
+##    while fs.readLine(line):
+##      echo line
+##    fs.close()
 
 include "system/inclrtl"
 
@@ -371,7 +391,7 @@ when not defined(js):
     result.writeDataImpl = fsWriteData
     result.flushImpl = fsFlush
 
-  proc newFileStream*(filename: string, mode: FileMode): FileStream =
+  proc newFileStream*(filename: string, mode: FileMode = fmRead): FileStream =
     ## creates a new stream from the file named `filename` with the mode `mode`.
     ## If the file cannot be opened, nil is returned. See the `system
     ## <system.html>`_ module for a list of available FileMode enums.

lib/system.nim

@@ -221,11 +221,21 @@ proc high*[T](x: T): T {.magic: "High", noSideEffect.}
   ## the highest possible value of an ordinal value `x`. As a special
   ## semantic rule, `x` may also be a type identifier.
   ## ``high(int)`` is Nim's way of writing `INT_MAX`:idx: or `MAX_INT`:idx:.
+  ##
+  ## .. code-block:: nim
+  ##  var arr = [1,2,3,4,5,6,7]
+  ##  high(arr) #=> 6
+  ##  high(2) #=> 9223372036854775807
 
 proc low*[T](x: T): T {.magic: "Low", noSideEffect.}
   ## returns the lowest possible index of an array, a sequence, a string or
   ## the lowest possible value of an ordinal value `x`. As a special
   ## semantic rule, `x` may also be a type identifier.
+  ##
+  ## .. code-block:: nim
+  ##  var arr = [1,2,3,4,5,6,7]
+  ##  high(arr) #=> 0
+  ##  high(2) #=> -9223372036854775808
 
 type
   range*{.magic: "Range".}[T] ## Generic type to construct range types.
@@ -584,6 +594,10 @@ proc sizeof*[T](x: T): int {.magic: "SizeOf", noSideEffect.}
   ## its usage is discouraged - using ``new`` for the most cases suffices
   ## that one never needs to know ``x``'s size. As a special semantic rule,
   ## ``x`` may also be a type identifier (``sizeof(int)`` is valid).
+  ##
+  ## .. code-block:: nim
+  ##  sizeof('A') #=> 1
+  ##  sizeof(2) #=> 8
 
 when defined(nimtypedescfixed):
   proc sizeof*(x: typedesc): int {.magic: "SizeOf", noSideEffect.}
@@ -705,12 +719,22 @@ template excl*[T](s: var set[T], flags: set[T]) =
 proc card*[T](x: set[T]): int {.magic: "Card", noSideEffect.}
   ## returns the cardinality of the set ``x``, i.e. the number of elements
   ## in the set.
+  ##
+  ## .. code-block:: nim
+  ##  var i = {1,2,3,4}
+  ##  card(i) #=> 4
 
 proc ord*[T](x: T): int {.magic: "Ord", noSideEffect.}
   ## returns the internal int value of an ordinal value ``x``.
+  ##
+  ## .. code-block:: nim
+  ##  ord('A') #=> 65
 
 proc chr*(u: range[0..255]): char {.magic: "Chr", noSideEffect.}
   ## converts an int in the range 0..255 to a character.
+  ##
+  ## .. code-block:: nim
+  ##  chr(65) #=> A
 
 # --------------------------------------------------------------------------
 # built-in operators
@@ -1315,6 +1339,10 @@ proc add *[T](x: var seq[T], y: openArray[T]) {.noSideEffect.} =
   ## containers should also call their adding proc `add` for consistency.
   ## Generic code becomes much easier to write if the Nim naming scheme is
   ## respected.
+  ##
+  ## .. code-block:: nim
+  ##   var s: seq[string] = @["test2","test2"]
+  ##   s.add("test") #=> @[test2, test2, test]
   let xl = x.len
   setLen(x, xl + y.len)
   for i in 0..high(y): x[xl+i] = y[i]
@@ -1329,6 +1357,10 @@ proc shallowCopy*[T](x: var T, y: T) {.noSideEffect, magic: "ShallowCopy".}
 proc del*[T](x: var seq[T], i: Natural) {.noSideEffect.} =
   ## deletes the item at index `i` by putting ``x[high(x)]`` into position `i`.
   ## This is an O(1) operation.
+  ##
+  ## .. code-block:: nim
+  ##  var i = @[1,2,3,4,5]
+  ##  i.del(2) #=> @[1, 2, 5, 4]
   let xl = x.len - 1
   shallowCopy(x[i], x[xl])
   setLen(x, xl)
@@ -1336,6 +1368,10 @@ proc del*[T](x: var seq[T], i: Natural) {.noSideEffect.} =
 proc delete*[T](x: var seq[T], i: Natural) {.noSideEffect.} =
   ## deletes the item at index `i` by moving ``x[i+1..]`` by one position.
   ## This is an O(n) operation.
+  ##
+  ## .. code-block:: nim
+  ##  var i = @[1,2,3,4,5]
+  ##  i.delete(2) #=> @[1, 2, 4, 5]
   template defaultImpl =
     let xl = x.len
     for j in i..xl-2: shallowCopy(x[j], x[j+1])
@@ -1351,6 +1387,10 @@ proc delete*[T](x: var seq[T], i: Natural) {.noSideEffect.} =
 
 proc insert*[T](x: var seq[T], item: T, i = 0.Natural) {.noSideEffect.} =
   ## inserts `item` into `x` at position `i`.
+  ##
+  ## .. code-block:: nim
+  ##  var i = @[1,2,3,4,5]
+  ##  i.insert(2,4) #=> @[1, 2, 3, 4, 2, 5]
   template defaultImpl =
     let xl = x.len
     setLen(x, xl+1)
@@ -1371,6 +1411,12 @@ proc repr*[T](x: T): string {.magic: "Repr", noSideEffect.}
   ## takes any Nim variable and returns its string representation. It
   ## works even for complex data graphs with cycles. This is a great
   ## debugging tool.
+  ##
+  ## .. code-block:: nim
+  ##  var s: seq[string] = @["test2","test2"]
+  ##  var i = @[1,2,3,4,5]
+  ##  repr(s) #=> 0x1055eb050[0x1055ec050"test2", 0x1055ec078"test2"]
+  ##  repr(i) #=> 0x1055ed050[1, 2, 3, 4, 5]
 
 type
   ByteAddress* = int

tests/stdlib/tmemfiles1.nim

@@ -1,5 +1,4 @@
 discard """
-  test that closing a closed file is ignored (no error raised)
   file: "tmemfiles1.nim"
 """
 import memfiles, os

tests/stdlib/tmemfiles2.nim

@@ -1,5 +1,4 @@
 discard """
-  test creating/reading/writing/changing memfiles
   file: "tmemfiles2.nim"
   output: '''Full read size: 20
 Half read size: 10 Data: Hello'''

tests/stdlib/tstreams2.nim

@@ -0,0 +1,13 @@
+discard """
+  file: "tstreams2.nim"
+  output: '''fs is: nil'''
+"""
+import streams
+var
+  fs = newFileStream("amissingfile.txt")
+  line = ""
+echo "fs is: ",repr(fs)
+if not isNil(fs):
+  while fs.readLine(line):
+    echo line
+  fs.close()