From b6607e7e796f5b58d64211c022d3e1af6159bdaa Mon Sep 17 00:00:00 2001
From: Dominik Vogt <dvogt@ffm.tc.iot.dtag.de>
Date: Thu, 27 Dec 2007 11:11:28 +0100
Subject: [PATCH] Add system-wide configuration file and new config file
 environment vars

Introduced envvars TIGRC_USER and TIGRC_SYSTEM to control which config
file is used. The default user specific config file can be overridden
with TIGRC_USER.  Before loading the user config file, tig now looks for
a system wide config file ($(sysconfdir)/tirgc by default). This can be
overridden with the environment variable TIGRC_SYSTEM.

Also corrected a small mistake in the Makefile. Instead of setting
CFLAGS for '-D...' compiler options, use CPPFLAGS.

[ The original code from Dominik was changed so that tig always reads
  the system-wide configuration file. The documentation was improved
  so the configured sysconfdir is used in the generated documentation.
  -- jonas ]

Signed-off-by: Jonas Fonseca <fonseca@diku.dk>
---
 Makefile       |  6 ++++--
 config.make.in |  1 +
 manual.txt     | 15 +++++++++++++++
 tig.1.txt      | 10 ++++++++++
 tig.c          | 46 ++++++++++++++++++++++++++++++++--------------
 5 files changed, 62 insertions(+), 16 deletions(-)

diff --git a/Makefile b/Makefile
index 6cc4e42..c2d6b60 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,7 @@ all:
 prefix ?= $(HOME)
 bindir ?= $(prefix)/bin
 datarootdir ?= $(prefix)/share
+sysconfdir ?= $(prefix)/etc
 docdir ?= $(datarootdir)/doc
 mandir ?= $(datarootdir)/man
 # DESTDIR=
@@ -47,11 +48,12 @@ else
 TARNAME	= tig-$(RPM_VERSION)
 endif
 
-override CFLAGS += '-DTIG_VERSION="$(VERSION)"'
+override CPPFLAGS += '-DTIG_VERSION="$(VERSION)"'
+override CPPFLAGS += '-DSYSCONFDIR="$(sysconfdir)"'
 
 AUTORECONF ?= autoreconf
 ASCIIDOC ?= asciidoc
-ASCIIDOC_FLAGS = -aversion=$(VERSION)
+ASCIIDOC_FLAGS = -aversion=$(VERSION) -asysconfdir=$(sysconfdir)
 XMLTO ?= xmlto
 DOCBOOK2PDF ?= docbook2pdf
 
diff --git a/config.make.in b/config.make.in
index 3af2ea9..3962050 100644
--- a/config.make.in
+++ b/config.make.in
@@ -4,6 +4,7 @@ bindir = @bindir@
 mandir = @mandir@
 docdir = @docdir@
 datarootdir = @datarootdir@
+sysconfdir = @sysconfdir@
 
 CC = @CC@
 CFLAGS = @CFLAGS@
diff --git a/manual.txt b/manual.txt
index 1bafd1b..efdb079 100644
--- a/manual.txt
+++ b/manual.txt
@@ -65,6 +65,21 @@ Environment Variables
 Several options related to the interface with git can be configured via
 environment options.
 
+[[configuration-files]]
+Configuration Files
+~~~~~~~~~~~~~~~~~~~
+
+Upon startup, tig first reads the system wide configuration file
+(`{sysconfdir}/tigrc` by default) and then proceeds to read the user's
+configuration file (`~/.tigrc` by default). The paths to either of these files
+can be overridden through the following environment variables:
+
+TIGRC_USER::
+	Path of the user configuration file.
+
+TIGRC_SYSTEM::
+	Path of the system wide configuration file.
+
 [[repo-refs]]
 Repository References
 ~~~~~~~~~~~~~~~~~~~~~
diff --git a/tig.1.txt b/tig.1.txt
index 30508ea..7b1c779 100644
--- a/tig.1.txt
+++ b/tig.1.txt
@@ -119,6 +119,13 @@ ENVIRONMENT VARIABLES
 In addition to environment variables used by git (e.g. GIT_DIR), tig defines
 the following:
 
+TIGRC_USER::
+	Path of the user configuration file (defaults to `~/.tigrc`).
+
+TIGRC_SYSTEM::
+	Path of the system wide configuration file (defaults to
+	`{sysconfdir}/tigrc`).
+
 TIG_LS_REMOTE::
 	Set command for retrieving all repository references. The command
 	should output data in the same format as git-ls-remote(1).
@@ -153,6 +160,9 @@ FILES
 '~/.tigrc'::
 	User configuration file. See gitlink:tigrc[5] for examples.
 
+'{sysconfdir}/tigrc'::
+	System wide configuration file.
+
 '$GIT_DIR/config'::
 	Repository config file. Read on start-up with the help of
 	git-config(1).
diff --git a/tig.c b/tig.c
index c614690..c44409e 100644
--- a/tig.c
+++ b/tig.c
@@ -1271,29 +1271,47 @@ read_option(char *opt, size_t optlen, char *value, size_t valuelen)
 	return OK;
 }
 
-static int
-load_options(void)
+static void
+load_option_file(const char *path)
 {
-	char *home = getenv("HOME");
-	char buf[SIZEOF_STR];
 	FILE *file;
 
+	/* It's ok that the file doesn't exist. */
+	file = fopen(path, "r");
+	if (!file)
+		return;
+
 	config_lineno = 0;
 	config_errors = FALSE;
 
-	add_builtin_run_requests();
+	if (read_properties(file, " \t", read_option) == ERR ||
+	    config_errors == TRUE)
+		fprintf(stderr, "Errors while loading %s.\n", path);
+}
 
-	if (!home || !string_format(buf, "%s/.tigrc", home))
-		return ERR;
+static int
+load_options(void)
+{
+	char *home = getenv("HOME");
+	char *tigrc_user = getenv("TIGRC_USER");
+	char *tigrc_system = getenv("TIGRC_SYSTEM");
+	char buf[SIZEOF_STR];
 
-	/* It's ok that the file doesn't exist. */
-	file = fopen(buf, "r");
-	if (!file)
-		return OK;
+	add_builtin_run_requests();
 
-	if (read_properties(file, " \t", read_option) == ERR ||
-	    config_errors == TRUE)
-		fprintf(stderr, "Errors while loading %s.\n", buf);
+	if (!tigrc_system) {
+		if (!string_format(buf, "%s/tigrc", SYSCONFDIR))
+			return ERR;
+		tigrc_system = buf;
+	}
+	load_option_file(tigrc_system);
+
+	if (!tigrc_user) {
+		if (!home || !string_format(buf, "%s/.tigrc", home))
+			return ERR;
+		tigrc_user = buf;
+	}
+	load_option_file(tigrc_user);
 
 	return OK;
 }
-- 
2.11.0