implements a --nep1:on switch to make the compiler enforce the naming conventions outlined in NEP-1

compiler/commands.nim

@@ -717,6 +717,8 @@ proc processSwitch*(switch, arg: string, pass: TCmdLinePass, info: TLineInfo;
     doAssert(conf != nil)
     incl(conf.features, destructor)
     defineSymbol(conf.symbols, "nimNewRuntime")
+  of "nep1":
+    processOnOffSwitchG(conf, {optCheckNep1}, arg, pass, info)
   of "cppcompiletonamespace":
     expectNoArg(conf, switch, arg, pass, info)
     incl conf.globalOptions, optUseNimNamespace

compiler/linter.nim

@@ -13,9 +13,18 @@
 import
   strutils, os, intsets, strtabs
 
-import ".." / [options, ast, astalgo, msgs, semdata, ropes, idents,
-  lineinfos]
-import prettybase
+import options, ast, astalgo, msgs, semdata, ropes, idents,
+  lineinfos
+
+const
+  Letters* = {'a'..'z', 'A'..'Z', '0'..'9', '\x80'..'\xFF', '_'}
+
+proc identLen*(line: string, start: int): int =
+  while start+result < line.len and line[start+result] in Letters:
+    inc result
+
+when false:
+  import prettybase
 
 type
   StyleCheck* {.pure.} = enum None, Warn, Auto
@@ -93,12 +102,16 @@ proc beautifyName(s: string, k: TSymKind): string =
       result.add s[i]
     inc i
 
+proc differ*(line: string, a, b: int, x: string): bool =
+  let y = line[a..b]
+  result = cmpIgnoreStyle(y, x) == 0 and y != x
+
 proc replaceInFile(conf: ConfigRef; info: TLineInfo; newName: string) =
   let line = conf.m.fileInfos[info.fileIndex.int].lines[info.line.int-1]
   var first = min(info.col.int, line.len)
   if first < 0: return
   #inc first, skipIgnoreCase(line, "proc ", first)
-  while first > 0 and line[first-1] in prettybase.Letters: dec first
+  while first > 0 and line[first-1] in Letters: dec first
   if first < 0: return
   if line[first] == '`': inc first
 
@@ -120,27 +133,37 @@ proc checkStyle(conf: ConfigRef; cache: IdentCache; info: TLineInfo, s: string,
 
 proc styleCheckDefImpl(conf: ConfigRef; cache: IdentCache; info: TLineInfo; s: PSym; k: TSymKind) =
   # operators stay as they are:
-  if k in {skResult, skTemp} or s.name.s[0] notin prettybase.Letters: return
+  if k in {skResult, skTemp} or s.name.s[0] notin Letters: return
   if k in {skType, skGenericParam} and sfAnon in s.flags: return
   if {sfImportc, sfExportc} * s.flags == {} or gCheckExtern:
     checkStyle(conf, cache, info, s.name.s, k, s)
 
-template styleCheckDef*(info: TLineInfo; s: PSym; k: TSymKind) =
+proc nep1CheckDefImpl(conf: ConfigRef; info: TLineInfo; s: PSym; k: TSymKind) =
+  # operators stay as they are:
+  if k in {skResult, skTemp} or s.name.s[0] notin Letters: return
+  if k in {skType, skGenericParam} and sfAnon in s.flags: return
+  let beau = beautifyName(s.name.s, k)
+  if s.name.s != beau:
+    message(conf, info, hintName, beau)
+
+template styleCheckDef*(conf: ConfigRef; info: TLineInfo; s: PSym; k: TSymKind) =
+  if optCheckNep1 in conf.globalOptions:
+    nep1CheckDefImpl(conf, info, s, k)
   when defined(nimfix):
     if gStyleCheck != StyleCheck.None: styleCheckDefImpl(conf, cache, info, s, k)
 
-template styleCheckDef*(info: TLineInfo; s: PSym) =
-  styleCheckDef(info, s, s.kind)
-template styleCheckDef*(s: PSym) =
-  styleCheckDef(s.info, s, s.kind)
+template styleCheckDef*(conf: ConfigRef; info: TLineInfo; s: PSym) =
+  styleCheckDef(conf, info, s, s.kind)
+template styleCheckDef*(conf: ConfigRef; s: PSym) =
+  styleCheckDef(conf, s.info, s, s.kind)
 
-proc styleCheckUseImpl(conf: ConfigRef; cache: IdentCache; info: TLineInfo; s: PSym) =
+proc styleCheckUseImpl(conf: ConfigRef; info: TLineInfo; s: PSym) =
   if info.fileIndex.int < 0: return
   # we simply convert it to what it looks like in the definition
   # for consistency
 
   # operators stay as they are:
-  if s.kind in {skResult, skTemp} or s.name.s[0] notin prettybase.Letters:
+  if s.kind in {skResult, skTemp} or s.name.s[0] notin Letters:
     return
   if s.kind in {skType, skGenericParam} and sfAnon in s.flags: return
   let newName = s.name.s
@@ -150,4 +173,4 @@ proc styleCheckUseImpl(conf: ConfigRef; cache: IdentCache; info: TLineInfo; s: P
 
 template styleCheckUse*(info: TLineInfo; s: PSym) =
   when defined(nimfix):
-    if gStyleCheck != StyleCheck.None: styleCheckUseImpl(conf, cache, info, s)
+    if gStyleCheck != StyleCheck.None: styleCheckUseImpl(conf, info, s)

compiler/nimfix/nimfix.nim

@@ -11,7 +11,7 @@
 
 import strutils, os, parseopt
 import compiler/[options, commands, modules, sem,
-  passes, passaux, nimfix/pretty,
+  passes, passaux, linter,
   msgs, nimconf,
   extccomp, condsyms,
   modulegraphs, idents]

compiler/nimfix/prettybase.nim

@@ -7,21 +7,11 @@
 #    distribution, for details about the copyright.
 #
 
-import strutils, lexbase, streams
-import ".." / [ast, msgs, lineinfos, idents, options]
+import strutils except Letters
+import lexbase, streams
+import ".." / [ast, msgs, lineinfos, idents, options, linter]
 from os import splitFile
 
-const
-  Letters* = {'a'..'z', 'A'..'Z', '0'..'9', '\x80'..'\xFF', '_'}
-
-proc identLen*(line: string, start: int): int =
-  while start+result < line.len and line[start+result] in Letters:
-    inc result
-
-proc differ*(line: string, a, b: int, x: string): bool =
-  let y = line[a..b]
-  result = cmpIgnoreStyle(y, x) == 0 and y != x
-
 proc replaceDeprecated*(conf: ConfigRef; info: TLineInfo; oldSym, newSym: PIdent) =
   let line = sourceLine(conf, info)
   var first = min(info.col.int, line.len)

compiler/options.nim

@@ -54,7 +54,7 @@ type                          # please make sure we have under 32 options
     optGenScript,             # generate a script file to compile the *.c files
     optGenMapping,            # generate a mapping file
     optRun,                   # run the compiled project
-    optCaasEnabled            # compiler-as-a-service is running
+    optCheckNep1,             # check that the names adhere to NEP-1
     optSkipConfigFile,        # skip the general config file
     optSkipProjConfigFile,    # skip the project's config file
     optSkipUserConfigFile,    # skip the users's config file
@@ -372,7 +372,6 @@ proc usesNativeGC*(conf: ConfigRef): bool {.inline.} = conf.selectedGC >= gcRefc
 
 template compilationCachePresent*(conf: ConfigRef): untyped =
   conf.symbolFiles in {v2Sf, writeOnlySf}
-#  {optCaasEnabled, optSymbolFiles} * gGlobalOptions != {}
 
 template optPreserveOrigSource*(conf: ConfigRef): untyped =
   optEmbedOrigSrc in conf.globalOptions

compiler/sem.nim

@@ -15,7 +15,7 @@ import
   magicsys, parser, nversion, nimsets, semfold, modulepaths, importer,
   procfind, lookups, pragmas, passes, semdata, semtypinst, sigmatch,
   intsets, transf, vmdef, vm, idgen, aliases, cgmeth, lambdalifting,
-  evaltempl, patterns, parampatterns, sempass2, nimfix.pretty, semmacrosanity,
+  evaltempl, patterns, parampatterns, sempass2, linter, semmacrosanity,
   semparallel, lowerings, pluginsupport, plugins.active, rod, lineinfos
 
 from modulegraphs import ModuleGraph

compiler/semexprs.nim

@@ -2161,7 +2161,7 @@ proc semBlock(c: PContext, n: PNode): PNode =
       addDecl(c, labl)
     n.sons[0] = newSymNode(labl, n.sons[0].info)
     suggestSym(c.config, n.sons[0].info, labl, c.graph.usageSym)
-    styleCheckDef(labl)
+    styleCheckDef(c.config, labl)
   n.sons[1] = semExpr(c, n.sons[1])
   n.typ = n.sons[1].typ
   if isEmptyType(n.typ): n.kind = nkBlockStmt

compiler/semgnrc.nim

@@ -160,7 +160,7 @@ proc fuzzyLookup(c: PContext, n: PNode, flags: TSemGenericFlags,
 proc addTempDecl(c: PContext; n: PNode; kind: TSymKind) =
   let s = newSymS(skUnknown, getIdentNode(c, n), c)
   addPrelimDecl(c, s)
-  styleCheckDef(n.info, s, kind)
+  styleCheckDef(c.config, n.info, s, kind)
 
 proc semGenericStmt(c: PContext, n: PNode,
                     flags: TSemGenericFlags, ctx: var GenericCtx): PNode =

compiler/semstmts.nim

@@ -364,7 +364,7 @@ proc semIdentDef(c: PContext, n: PNode, kind: TSymKind): PSym =
     if result.owner.kind == skModule:
       incl(result.flags, sfGlobal)
   suggestSym(c.config, n.info, result, c.graph.usageSym)
-  styleCheckDef(result)
+  styleCheckDef(c.config, result)
 
 proc checkNilable(c: PContext; v: PSym) =
   if {sfGlobal, sfImportC} * v.flags == {sfGlobal} and
@@ -627,7 +627,7 @@ proc addForVarDecl(c: PContext, v: PSym) =
 proc symForVar(c: PContext, n: PNode): PSym =
   let m = if n.kind == nkPragmaExpr: n.sons[0] else: n
   result = newSymG(skForVar, m, c)
-  styleCheckDef(result)
+  styleCheckDef(c.config, result)
 
 proc semForVars(c: PContext, n: PNode): PNode =
   result = n

compiler/semtempl.nim

@@ -213,7 +213,7 @@ proc addLocalDecl(c: var TemplCtx, n: var PNode, k: TSymKind) =
       else:
         let local = newGenSym(k, ident, c)
         addPrelimDecl(c.c, local)
-        styleCheckDef(n.info, local)
+        styleCheckDef(c.c.config, n.info, local)
         replaceIdentBySym(c.c, n, newSymNode(local, n.info))
     else:
       replaceIdentBySym(c.c, n, ident)
@@ -260,7 +260,7 @@ proc semRoutineInTemplBody(c: var TemplCtx, n: PNode, k: TSymKind): PNode =
       var s = newGenSym(k, ident, c)
       s.ast = n
       addPrelimDecl(c.c, s)
-      styleCheckDef(n.info, s)
+      styleCheckDef(c.c.config, n.info, s)
       n.sons[namePos] = newSymNode(s, n.sons[namePos].info)
     else:
       n.sons[namePos] = ident
@@ -382,7 +382,7 @@ proc semTemplBody(c: var TemplCtx, n: PNode): PNode =
         # labels are always 'gensym'ed:
         let s = newGenSym(skLabel, n.sons[0], c)
         addPrelimDecl(c.c, s)
-        styleCheckDef(s)
+        styleCheckDef(c.c.config, s)
         n.sons[0] = newSymNode(s, n.sons[0].info)
     n.sons[1] = semTemplBody(c, n.sons[1])
     closeScope(c)
@@ -551,7 +551,7 @@ proc semTemplateDef(c: PContext, n: PNode): PNode =
     incl(s.flags, sfGlobal)
   else:
     s = semIdentVis(c, skTemplate, n.sons[0], {})
-  styleCheckDef(s)
+  styleCheckDef(c.config, s)
   # check parameter list:
   #s.scope = c.currentScope
   pushOwner(c, s)

compiler/semtypes.nim

@@ -114,8 +114,7 @@ proc semEnum(c: PContext, n: PNode, prev: PType): PType =
       incl(e.flags, sfExported)
       if not isPure: strTableAdd(c.module.tab, e)
     addSon(result.n, newSymNode(e))
-    let conf = c.config
-    styleCheckDef(e)
+    styleCheckDef(c.config, e)
     if sfGenSym notin e.flags:
       if not isPure: addDecl(c, e)
       else: importPureEnumField(c, e)
@@ -451,7 +450,7 @@ proc semTuple(c: PContext, n: PNode, prev: PType): PType =
       else:
         addSon(result.n, newSymNode(field))
         addSonSkipIntLit(result, typ)
-      if c.config.cmd == cmdPretty: styleCheckDef(a.sons[j].info, field)
+      styleCheckDef(c.config, a.sons[j].info, field)
   if result.n.len == 0: result.n = nil
 
 proc semIdentVis(c: PContext, kind: TSymKind, n: PNode,
@@ -491,7 +490,7 @@ proc semIdentWithPragma(c: PContext, kind: TSymKind, n: PNode,
     else: discard
   else:
     result = semIdentVis(c, kind, n, allowed)
-  if c.config.cmd == cmdPretty: styleCheckDef(n.info, result)
+  styleCheckDef(c.config, n.info, result)
 
 proc checkForOverlap(c: PContext, t: PNode, currentEx, branchIndex: int) =
   let ex = t[branchIndex][currentEx].skipConv
@@ -685,7 +684,7 @@ proc semRecordNodeAux(c: PContext, n: PNode, check: var IntSet, pos: var int,
         localError(c.config, n.sons[i].info, "attempt to redefine: '" & f.name.s & "'")
       if a.kind == nkEmpty: addSon(father, newSymNode(f))
       else: addSon(a, newSymNode(f))
-      styleCheckDef(f)
+      styleCheckDef(c.config, f)
     if a.kind != nkEmpty: addSon(father, a)
   of nkSym:
     # This branch only valid during generic object
@@ -1062,7 +1061,7 @@ proc semProcTypeNode(c: PContext, n, genericParams: PNode,
       addSon(result.n, newSymNode(arg))
       rawAddSon(result, finalType)
       addParamOrResult(c, arg, kind)
-      if c.config.cmd == cmdPretty: styleCheckDef(a.sons[j].info, arg)
+      styleCheckDef(c.config, a.sons[j].info, arg)
 
   var r: PType
   if n.sons[0].kind != nkEmpty:

compiler/sigmatch.nim

@@ -13,7 +13,7 @@
 import
   intsets, ast, astalgo, semdata, types, msgs, renderer, lookups, semtypinst,
   magicsys, condsyms, idents, lexer, options, parampatterns, strutils, trees,
-  nimfix / pretty, lineinfos
+  linter, lineinfos
 
 when defined(booting) or defined(nimsuggest):
   import docgen

nimsuggest/nimsuggest.nim

@@ -493,7 +493,6 @@ proc mainCommand(graph: ModuleGraph) =
   registerPass graph, verbosePass
   registerPass graph, semPass
   conf.cmd = cmdIdeTools
-  incl conf.globalOptions, optCaasEnabled
   wantMainModule(conf)
 
   if not fileExists(conf.projectFull):