add `make config` mechanism.

`make config` will now install a sample configuration file at
`~/.config/git-difme/config`.

* Makefile (config, $(config_dir), $(config_file)): new targets.

* README.org (the config file): add sub section under `installing`
section.

* examples/config: add file; sample user config file.

3 files changed, 28 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 7e05c8b..afb8292 100644
--- a/Makefile
+++ b/Makefile
@@ -7,6 +7,10 @@ bin=$(HOME)/.bin
 git_difme=$(bin)/git-difme
 git_difme_src=git-difme.scm
 
+config_dir = $(HOME)/.config/git-difme
+config_file=$(config_dir)/config
+example_config=examples/config
+
 nothing:
 	@echo "Give me something to make. "
 .PHONY: nothing
@@ -14,6 +18,9 @@ nothing:
 git-difme: $(git_difme)
 .PHONY: git-difme
 
+config: $(config_file)
+.PHONY: config
+
 $(git_difme): $(git_difme_src)
 	@mkdir -p $(bin)
 	@touch $@
@@ -24,3 +31,8 @@ $(git_difme): $(git_difme_src)
 	@echo "Script at" $@
 	@echo "Add" $(bin) "to PATH"
 
+$(config_dir):
+	@mkdir -p $@
+
+$(config_file): $(example_config) $(config_dir)
+	@cp -i $< $@
diff --git a/README.org b/README.org
index 63148a9..e096bf9 100644
--- a/README.org
+++ b/README.org
@@ -76,6 +76,14 @@ path=(~/.bin $path)
 
 to =.zshenv=.
 
+*** the config file
+
+#+BEGIN_SRC bash
+make config
+#+END_SRC
+
+that will install a sample config file at =~/.config/git-difme=.
+
 ** license
 
 gnu general public license version 3 or higher.
diff --git a/examples/config b/examples/config
new file mode 100644
index 0000000..f4aec4f
--- /dev/null
+++ b/examples/config
@@ -0,0 +1,8 @@
+;; -*- mode: scheme; -*-
+;; public domain. no rights reserved.
+
+(define (difme-repos)
+  (list '("/path/to/git/repo/foo" "M" "D" "?")
+        '("/path/to/git/repo/bar" "M")
+        '("/path/to/git/repo/baz" "M" "?")
+        '("/path/to/git/repo/frb")))