Add editor(5).

editor/Makefile

@@ -38,6 +38,8 @@ install: all
 	install $(BINARY) $(DESTDIR)$(BINDIR)
 	mkdir -p $(DESTDIR)$(MANDIR)/man1
 	install editor.1 $(DESTDIR)$(MANDIR)/man1/editor.1
+	mkdir -p $(DESTDIR)$(MANDIR)/man5
+	install editor.5 $(DESTDIR)$(MANDIR)/man5/editor.5
 
 clean:
 	rm -f $(BINARY) $(OBJS) *.o

editor/editor.1

@@ -54,8 +54,22 @@ Open new file containing output of running
 .It Sy tabsize Ar tab-size
 Select tab size.
 .El
+.Pp
+A subset of these commands can be stored in the
+.Xr editor 5
+configuration file loaded on
+.Nm
+startup.
+.Sh FILES
+.Bl -tag -width "$HOME/.editor" -compact
+.It Pa /etc/editor
+Global configuration.
+.It Pa ~/.editor
+User configuration.
+.El
 .Sh SEE ALSO
-.Xr pager 1
+.Xr pager 1 ,
+.Xr editor 5
 .Sh BUGS
 .Nm
 lacks a number of crucial features, such as undo and redo, ability to open

editor/editor.5

@@ -0,0 +1,26 @@
+.Dd $Mdocdate: January 8 2015 $
+.Dt EDITOR 5
+.Os
+.Sh NAME
+.Nm editor
+.Nd editor configuration
+.Sh SYNOPSIS
+.Nm /etc/editor
+.Nm ~/.editor
+.Sh DESCRIPTION
+.Xr editor 1
+loads these files on startup and executes the commands therein as described in
+.Xr editor 1 .  Only commands applicable as global configuration are executed to
+avoid undesirable side effects.  For instance,
+.Sy popen
+isn't executed as that would open another file than the current one.  Unknown
+commands are silently ignored.
+.Sh FILES
+.Bl -tag -width "$HOME/.editor" -compact
+.It Pa /etc/editor
+Global configuration.
+.It Pa ~/.editor
+User configuration.
+.El
+.Sh SEE ALSO
+.Xr editor 1

editor/editor.c++

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015.
+    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015, 2016.
 
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by the Free
@@ -31,6 +31,7 @@
 #include <error.h>
 #include <limits.h>
 #include <locale.h>
+#include <pwd.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -44,6 +45,7 @@
 #include "editor.h++"
 #include "highlight.h++"
 #include "input.h++"
+#include "modal.h++"
 #include "terminal.h++"
 
 void initialize_editor(struct editor* editor)
@@ -88,6 +90,47 @@ void initialize_editor(struct editor* editor)
 	editor->color_lines = NULL;
 }
 
+void editor_load_config_path(struct editor* editor, const char* path)
+{
+	FILE* fp = fopen(path, "r");
+	if ( !fp )
+	{
+		if ( errno != ENOENT )
+			error(0, errno, "%s", path);
+		return;
+	}
+	char* line = NULL;
+	size_t line_size = 0;
+	ssize_t line_length = 0;
+	while ( 0 <= (errno = 0, line_length = getline(&line, &line_size, fp)) )
+	{
+		if ( line[line_length - 1] == '\n' )
+			line[--line_length] = '\0';
+		line_length = strcspn(line, "#");
+		line[line_length] = '\0';
+		editor_modal_command_config(editor, line);
+	}
+	if ( errno != 0 )
+		error(0, errno, "getline: %s", path);
+	fclose(fp);
+}
+
+void editor_load_config(struct editor* editor)
+{
+	editor_load_config_path(editor, "/etc/editor");
+	const char* home = getenv("HOME");
+	if ( !home )
+		return;
+	char* path;
+	if ( asprintf(&path, "%s/.editor", home) < 0 )
+	{
+		error(0, errno, "malloc");
+		return;
+	}
+	editor_load_config_path(editor, path);
+	free(path);
+}
+
 void editor_reset_contents(struct editor* editor)
 {
 	for ( size_t i = 0; i < editor->lines_used; i++ )
@@ -242,6 +285,8 @@ int main(int argc, char* argv[])
 	struct editor editor;
 	initialize_editor(&editor);
 
+	editor_load_config(&editor);
+
 	if ( 2 <= argc && !editor_load_file(&editor, argv[1]) )
 		error(1, errno, "`%s'", argv[1]);
 

editor/modal.c++

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015.
+    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2015, 2016.
 
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by the Free
@@ -282,6 +282,21 @@ void editor_modal_command(struct editor* editor, const char* cmd)
 		editor->modal_error = true;
 }
 
+void editor_modal_command_config(struct editor* editor, const char* cmd)
+{
+	while ( *cmd && isspace((unsigned char) *cmd) )
+		cmd++;
+	if ( is_modal_command(cmd, "margin", &cmd) )
+		editor_modal_margin(editor, cmd);
+	else if ( is_modal_command(cmd, "tabsize", &cmd) )
+		editor_modal_tabsize(editor, cmd);
+	else if ( is_modal_command(cmd, "language", &cmd) )
+		editor_modal_language(editor, cmd);
+	else if ( is_modal_command(cmd, "line-numbering", &cmd) )
+		editor_modal_line_numbering(editor, cmd);
+}
+
+
 void editor_modal_character(struct editor* editor, wchar_t c)
 {
 	if ( editor->control )

editor/modal.h++

@@ -1,6 +1,6 @@
 /*******************************************************************************
 
-    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
+    Copyright(C) Jonas 'Sortie' Termansen 2013, 2014, 2016.
 
     This program is free software: you can redistribute it and/or modify it
     under the terms of the GNU General Public License as published by the Free
@@ -47,6 +47,7 @@ void editor_modal_line_numbering(struct editor* editor, const char* truth);
 
 bool is_modal_command(const char* cmd, const char* candidate, const char** rest);
 void editor_modal_command(struct editor* editor, const char* cmd);
+void editor_modal_command_config(struct editor* editor, const char* cmd);
 void editor_modal_character(struct editor* editor, wchar_t c);
 
 #endif