Add function to remove function bodies

src/nimgen/c2nim.nim

@@ -28,6 +28,9 @@ proc c2nim*(fl, outfile: string, c2nimConfig: c2nimConfigObj) =
     cfile = "temp-$#.c" % [outfile.extractFilename()]
     writeFileFlush(cfile, runCtags(file))
 
+  if c2nimConfig.removeBodies:
+    removeBodies(cfile)
+
   if c2nimConfig.defines and (c2nimConfig.preprocess or c2nimConfig.ctags):
     prepend(cfile, getDefines(file, c2nimConfig.inline))
 
@@ -103,6 +106,8 @@ proc c2nim*(fl, outfile: string, c2nimConfig: c2nimConfigObj) =
     except:
       discard
   else:
+    if c2nimConfig.removeBodies:
+      reAddBodies(cfile)
     reAddStatic(cfile)
 
   # Nim doesn't like {.cdecl.} for type proc()

src/nimgen/fileops.nim

@@ -91,6 +91,36 @@ proc removeStatic*(filename: string) =
         result.add(body.replace(re"(?m)^(.*\n?)", "//$1"))
     )
 
+proc removeBodies*(filename: string) =
+  ## Replace function bodies with a semicolon and commented
+  ## out body
+  withFile(filename):
+    content = content.replace(
+      re"(?m)(.*?\))(\s*\{(\s*?.*?$)*?[\n\r]\})",
+      proc (m: RegexMatch, s: string): string =
+        let funcDecl = s[m.group(0)[0]]
+        let body = s[m.group(1)[0]].strip()
+        result = ""
+
+        result.add("$#;" % [funcDecl])
+        result.add(body.replace(re"(?m)^(.*\n?)", "//$1"))
+    )
+
+proc reAddBodies*(filename: string) =
+  ## Uncomment out the body and remove the semicolon. Undoes
+  ## removeBodies
+  withFile(filename):
+    content = content.replace(
+      re"(?m)(.*?\))(\s*\{(\s*?.*?$)*?[\n\r]\})",
+      proc (m: RegexMatch, s: string): string =
+        let funcDecl = s[m.group(0)[0]]
+        let body = s[m.group(1)[0]].strip()
+        result = ""
+
+        result.add("$# " % [funcDecl])
+        result.add(body.replace(re"(?m)^\/\/(.*\n?)", "$1"))
+    )
+
 proc reAddStatic*(filename: string) =
   ## Uncomment out the body and remove the semicolon. Undoes
   ## removeStatic

src/nimgen/globals.nim

@@ -32,7 +32,7 @@ var
 type
   c2nimConfigObj* = object
     flags*, ppflags*: string
-    recurse*, inline*, preprocess*, ctags*, defines*: bool
+    recurse*, inline*, preprocess*, removeBodies*, ctags*, defines*: bool
     dynlib*, compile*, pragma*: seq[string]
 
 const gDoc* = """

src/nimgen/runcfg.nim

@@ -130,6 +130,8 @@ proc runFile*(file: string, cfgin: OrderedTableRef = newOrderedTable[string, str
             c2nimConfig.inline = true
           elif action == "preprocess":
             c2nimConfig.preprocess = true
+          elif action == "removeBodies":
+            c2nimConfig.removeBodies = true
           elif action == "ctags":
             c2nimConfig.ctags = true
           elif action == "defines":
@@ -406,4 +408,4 @@ proc runCli*() =
     uniq += 1
 
   for file in files:
-    runFile(file, cfg)
+    runFile(file, cfg)