start adding configuration

6 files changed, 129 insertions, 6 deletions

diff --git a/Makefile b/Makefile
index bdf6871..141e7dd 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 OUT      = runes
-OBJ      = runes.o display.o term.o parser.o window-xlib.o pty-unix.o
+OBJ      = runes.o display.o term.o parser.o config.o window-xlib.o pty-unix.o
 LIBS     = cairo cairo-xlib libuv pangocairo
 CFLAGS  ?= -g -Wall -Wextra -Werror
 LDFLAGS ?= -g -Wall -Wextra -Werror
diff --git a/config.c b/config.c
new file mode 100644
index 0000000..1664e4b
--- /dev/null
+++ b/config.c
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "runes.h"
+
+static void runes_config_set_defaults(RunesTerm *t);
+static FILE *runes_config_get_config_file();
+static void runes_config_process_config_file(RunesTerm *t, FILE *config_file);
+static void runes_config_set(RunesTerm *t, char *key, char *value);
+
+void runes_config_init(RunesTerm *t, int argc, char *argv[])
+{
+    UNUSED(argc);
+    UNUSED(argv);
+
+    memset((void *)t, 0, sizeof(*t));
+
+    runes_config_set_defaults(t);
+    runes_config_process_config_file(t, runes_config_get_config_file());
+}
+
+static void runes_config_set_defaults(RunesTerm *t)
+{
+    t->font_name = "monospace 10";
+}
+
+static FILE *runes_config_get_config_file()
+{
+    char *home, *config_dir, *path;
+    size_t home_len, config_dir_len;
+    FILE *file;
+
+    home = getenv("HOME");
+    home_len = strlen(home);
+
+    config_dir = getenv("XDG_CONFIG_HOME");
+    if (config_dir) {
+        config_dir = strdup(config_dir);
+    }
+    else {
+        config_dir = malloc(home_len + sizeof("/.config") + 1);
+        strcpy(config_dir, home);
+        strcpy(config_dir + home_len, "/.config");
+    }
+    config_dir_len = strlen(config_dir);
+
+    path = malloc(config_dir_len + sizeof("/runes/runes.conf") + 1);
+    strcpy(path, config_dir);
+    strcpy(path + config_dir_len, "/runes/runes.conf");
+    free(config_dir);
+
+    if ((file = fopen(path, "r"))) {
+        free(path);
+        return file;
+    }
+
+    free(path);
+    path = malloc(home_len + sizeof("/.runesrc") + 1);
+    strcpy(path, home);
+    strcpy(path + home_len, "/.runesrc");
+
+    if ((file = fopen(path, "r"))) {
+        free(path);
+        return file;
+    }
+
+    free(path);
+
+    if ((file = fopen("/etc/runesrc", "r"))) {
+        return file;
+    }
+
+    return NULL;
+}
+
+static void runes_config_process_config_file(RunesTerm *t, FILE *config_file)
+{
+    char line[1024];
+
+    if (!config_file) {
+        return;
+    }
+
+    while (fgets(line, 1024, config_file)) {
+        char *kbegin, *kend, *vbegin, *vend;
+        size_t len;
+
+        len = strlen(line);
+        if (line[len - 1] == '\n') {
+            line[len - 1] = '\0';
+            len--;
+        }
+
+        kbegin = line + strspn(line, " \t");
+        kend = kbegin + strcspn(kbegin, " \t=");
+        vbegin = kend + strspn(kend, " \t");
+        if (*vbegin != '=') {
+            fprintf(stderr, "couldn't parse line: '%s'\n", line);
+        }
+        vbegin++;
+        vbegin = vbegin + strspn(vbegin, " \t");
+        vend = line + len;
+
+        *kend = '\0';
+        *vend = '\0';
+
+        runes_config_set(t, kbegin, vbegin);
+    }
+}
+
+static void runes_config_set(RunesTerm *t, char *key, char *val)
+{
+    if (!strcmp(key, "font")) {
+        t->font_name = strdup(val);
+    }
+    else {
+        fprintf(stderr, "unknown option: '%s'\n", key);
+    }
+}
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..980cbab
--- /dev/null
+++ b/config.h
@@ -0,0 +1,6 @@
+#ifndef _RUNES_CONFIG_H
+#define _RUNES_CONFIG_H
+
+void runes_config_init(RunesTerm *t, int argc, char *argv[]);
+
+#endif
diff --git a/display.c b/display.c
index 0fdf7d8..98f09d7 100644
--- a/display.c
+++ b/display.c
@@ -15,7 +15,6 @@ static void runes_display_scroll_down(RunesTerm *t, int rows);
 
 void runes_display_init(RunesTerm *t)
 {
-    t->font_name = "Fixed 10.5";
     runes_display_recalculate_font_metrics(t);
 
     t->fgdefault = cairo_pattern_create_rgb(0.827, 0.827, 0.827);
diff --git a/runes.h b/runes.h
index 7287fd8..8c2861b 100644
--- a/runes.h
+++ b/runes.h
@@ -28,6 +28,7 @@ struct runes_loop_data {
 #include "term.h"
 #include "display.h"
 #include "parser.h"
+#include "config.h"
 
 #define UNUSED(x) ((void)x)
 
diff --git a/term.c b/term.c
index 6a18142..fe21752 100644
--- a/term.c
+++ b/term.c
@@ -1,11 +1,8 @@
-#include <stdlib.h>
-#include <string.h>
-
 #include "runes.h"
 
 void runes_term_init(RunesTerm *t, int argc, char *argv[])
 {
-    memset((void *)t, 0, sizeof(*t));
+    runes_config_init(t, argc, argv);
 
     /* doing most of the pty initialization right at the beginning, because
      * libuv will set up a bunch of state (including potentially things like