From e371546d522b1ce39a1009552a43de614368279a Mon Sep 17 00:00:00 2001
From: Joey Yakimowich-Payne <jyapayne@gmail.com>
Date: Sat, 16 Jun 2018 15:33:47 +0900
Subject: Add support for executing a command on a file.

$file in the command string references the file name. The stdout of the
command will become the file's new contents. This is useful for doing
things that nimgen might not support, like using sed or grep or some
other command line tool.
---
 README.md  |  2 ++
 nimgen.nim | 10 +++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index d47239e..0c4bb89 100644
--- a/README.md
+++ b/README.md
@@ -143,6 +143,8 @@ The following keys apply to library source code (before processing) and generate
 
 ```search``` = search string providing context for following prepend/append/replace directives
 
+```execute``` = execute a command on a file and store the output of the command as the new file contents. Ex: execute = "cat $file | grep 'static inline'"
+
 ```prepend``` = string value to prepend into file at beginning or before search
 
 ```append``` = string value to append into file at the end or after search
diff --git a/nimgen.nim b/nimgen.nim
index d804657..cff48e3 100644
--- a/nimgen.nim
+++ b/nimgen.nim
@@ -228,6 +228,12 @@ proc prepend(file: string, data: string, search="") =
       if idx != -1:
         content = content[0..<idx] & data & content[idx..<content.len()]
 
+proc execute(file: string, command: string) =
+  withFile(file):
+    let cmd = command % ["file", file]
+    let commandResult = execProc(cmd)
+    content = commandResult
+
 proc append(file: string, data: string, search="") =
   withFile(file):
     if search == "":
@@ -587,7 +593,7 @@ proc runFile(file: string, cfgin: OrderedTableRef) =
       if action == "create":
         createDir(file.splitPath().head)
         writeFile(file, cfg[act])
-      elif action in @["prepend", "append", "replace", "comment", "rename", "compile", "dynlib", "pragma"] and sfile != "":
+      elif action in @["prepend", "append", "replace", "comment", "rename", "compile", "dynlib", "pragma", "execute"] and sfile != "":
         if action == "prepend":
           if srch != "":
             prepend(sfile, cfg[act], cfg[srch])
@@ -612,6 +618,8 @@ proc runFile(file: string, cfgin: OrderedTableRef) =
           c2nimConfig.dynlib.add(cfg[act])
         elif action == "pragma":
           c2nimConfig.pragma.add(cfg[act])
+        elif action == "execute":
+          execute(sfile, cfg[act])
         srch = ""
       elif action == "search":
         srch = act
-- 
cgit v1.2.3


From a7edd8525d93ef07b3d1134067c3ab42a311d1bc Mon Sep 17 00:00:00 2001
From: Joey Yakimowich-Payne <jyapayne@gmail.com>
Date: Wed, 27 Jun 2018 22:22:38 +0900
Subject: Rename execute to pipe

---
 README.md  |  2 +-
 nimgen.nim | 17 +++++++++--------
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 0c4bb89..a92a5dc 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,7 @@ The following keys apply to library source code (before processing) and generate
 
 ```search``` = search string providing context for following prepend/append/replace directives
 
-```execute``` = execute a command on a file and store the output of the command as the new file contents. Ex: execute = "cat $file | grep 'static inline'"
+```pipe``` = execute a command on a file and store the output of the command as the new file contents. Ex: pipe = "cat $file | grep 'static inline'"
 
 ```prepend``` = string value to prepend into file at beginning or before search
 
diff --git a/nimgen.nim b/nimgen.nim
index cff48e3..82b072a 100644
--- a/nimgen.nim
+++ b/nimgen.nim
@@ -228,11 +228,12 @@ proc prepend(file: string, data: string, search="") =
       if idx != -1:
         content = content[0..<idx] & data & content[idx..<content.len()]
 
-proc execute(file: string, command: string) =
-  withFile(file):
-    let cmd = command % ["file", file]
-    let commandResult = execProc(cmd)
-    content = commandResult
+proc pipe(file: string, command: string) =
+  let cmd = command % ["file", file]
+  let commandResult = execProc(cmd).strip()
+  if commandResult != "":
+    withFile(file):
+      content = commandResult
 
 proc append(file: string, data: string, search="") =
   withFile(file):
@@ -593,7 +594,7 @@ proc runFile(file: string, cfgin: OrderedTableRef) =
       if action == "create":
         createDir(file.splitPath().head)
         writeFile(file, cfg[act])
-      elif action in @["prepend", "append", "replace", "comment", "rename", "compile", "dynlib", "pragma", "execute"] and sfile != "":
+      elif action in @["prepend", "append", "replace", "comment", "rename", "compile", "dynlib", "pragma", "pipe"] and sfile != "":
         if action == "prepend":
           if srch != "":
             prepend(sfile, cfg[act], cfg[srch])
@@ -618,8 +619,8 @@ proc runFile(file: string, cfgin: OrderedTableRef) =
           c2nimConfig.dynlib.add(cfg[act])
         elif action == "pragma":
           c2nimConfig.pragma.add(cfg[act])
-        elif action == "execute":
-          execute(sfile, cfg[act])
+        elif action == "pipe":
+          pipe(sfile, cfg[act])
         srch = ""
       elif action == "search":
         srch = act
-- 
cgit v1.2.3