Add --dump-default-config option

fmthoma · Dec 4, 2016 · 8ffbdf5 · 8ffbdf5
1 parent 8c37b44
commit 8ffbdf5
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diff --git a/app/Main.hs b/app/Main.hs
@@ -48,6 +48,7 @@ main = do
     args <- getArgs
     when ("-V" `elem` args || "--version" `elem` args) (printVersion >> exitSuccess)
     when ("--help" `elem` args) (printHelp >> exitSuccess)
+    when ("--dump-default-config" `elem` args) (printDefaultConfig >> exitSuccess)
 
     hSetBuffering stdin  LineBuffering
     hSetBuffering stdout LineBuffering
@@ -82,6 +83,8 @@ main = do
         runEffect (grepVersion >-> P.take 1 >-> P.map ("    " <>) >-> stdoutText)
     printHelp = putStrLn helpText
         where helpText = $(fmap (LitE . StringL) (runIO (readFile "help.txt")))
+    printDefaultConfig = putStrLn defaultConfigFile
+        where defaultConfigFile = $(fmap (LitE . StringL) (runIO (readFile "config.yaml.example")))
 
 
 type MainWidget  = HSplitWidget Results Pager

diff --git a/help.txt b/help.txt
@@ -11,4 +11,15 @@ Usage:
     as a pager for `grep -nH` output:
         grep -nH [GREP_OPTION...] PATTERN [FILE] | vgrep
 
+
+Additional options:
+    --help, -V     Prints this help.
+
+    --version      Prints version info and exits
+
+    --dump-default-config
+                   Prints the default config file to stdout and exits.
+                   (Usage: `vgrep --dump-default-config > ~/.vgrep/config.yaml`)
+
+
 For documentation on grep options an patterns see `grep --help`.