editor: move editor-related functions and declarations into common file

cache.h and strbuf.[ch] had editor-related functions.  Move these into
editor.[ch].

Signed-off-by: Elijah Newren <newren@gmail.com>
Acked-by: Calvin Wan <calvinwan@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

add-patch.c

@@ -2,6 +2,7 @@
 #include "add-interactive.h"
 #include "advice.h"
 #include "alloc.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "object-name.h"

builtin/add.c

@@ -9,6 +9,7 @@
 #include "config.h"
 #include "builtin.h"
 #include "lockfile.h"
+#include "editor.h"
 #include "dir.h"
 #include "gettext.h"
 #include "pathspec.h"

builtin/am.c

@@ -9,6 +9,7 @@
 #include "advice.h"
 #include "config.h"
 #include "builtin.h"
+#include "editor.h"
 #include "environment.h"
 #include "exec-cmd.h"
 #include "gettext.h"

builtin/branch.c

@@ -8,6 +8,7 @@
 #include "cache.h"
 #include "config.h"
 #include "color.h"
+#include "editor.h"
 #include "environment.h"
 #include "refs.h"
 #include "commit.h"

builtin/bugreport.c

@@ -1,5 +1,6 @@
 #include "builtin.h"
 #include "abspath.h"
+#include "editor.h"
 #include "gettext.h"
 #include "parse-options.h"
 #include "strbuf.h"

builtin/commit.c

@@ -13,6 +13,7 @@
 #include "cache-tree.h"
 #include "color.h"
 #include "dir.h"
+#include "editor.h"
 #include "environment.h"
 #include "builtin.h"
 #include "diff.h"

builtin/config.c

@@ -3,6 +3,7 @@
 #include "alloc.h"
 #include "config.h"
 #include "color.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "ident.h"

builtin/merge.c

@@ -12,6 +12,7 @@
 #include "advice.h"
 #include "alloc.h"
 #include "config.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "hex.h"

builtin/notes.c

@@ -10,6 +10,7 @@
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
+#include "editor.h"
 #include "gettext.h"
 #include "hex.h"
 #include "notes.h"

builtin/replace.c

@@ -11,6 +11,7 @@
 #include "cache.h"
 #include "config.h"
 #include "builtin.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "hex.h"

builtin/tag.c

@@ -10,6 +10,7 @@
 #include "advice.h"
 #include "config.h"
 #include "builtin.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "hex.h"

builtin/var.c

@@ -5,6 +5,7 @@
  */
 #include "builtin.h"
 #include "config.h"
+#include "editor.h"
 #include "ident.h"
 #include "refs.h"
 

cache.h

@@ -621,10 +621,7 @@ int df_name_compare(const char *name1, size_t len1, int mode1,
 int name_compare(const char *name1, size_t len1, const char *name2, size_t len2);
 int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
 
-const char *git_editor(void);
-const char *git_sequence_editor(void);
 const char *git_pager(int stdout_is_tty);
-int is_terminal_dumb(void);
 
 struct cache_def {
 	struct strbuf path;

color.c

@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "config.h"
 #include "color.h"
+#include "editor.h"
 #include "gettext.h"
 #include "hex.h"
 

editor.c

@@ -2,12 +2,14 @@
 #include "abspath.h"
 #include "advice.h"
 #include "config.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "strbuf.h"
 #include "strvec.h"
 #include "run-command.h"
 #include "sigchain.h"
+#include "wrapper.h"
 
 #ifndef DEFAULT_EDITOR
 #define DEFAULT_EDITOR "vi"
@@ -130,3 +132,31 @@ int launch_sequence_editor(const char *path, struct strbuf *buffer,
 {
 	return launch_specified_editor(git_sequence_editor(), path, buffer, env);
 }
+
+int strbuf_edit_interactively(struct strbuf *buffer, const char *path,
+			      const char *const *env)
+{
+	char *path2 = NULL;
+	int fd, res = 0;
+
+	if (!is_absolute_path(path))
+		path = path2 = xstrdup(git_path("%s", path));
+
+	fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
+	if (fd < 0)
+		res = error_errno(_("could not open '%s' for writing"), path);
+	else if (write_in_full(fd, buffer->buf, buffer->len) < 0) {
+		res = error_errno(_("could not write to '%s'"), path);
+		close(fd);
+	} else if (close(fd) < 0)
+		res = error_errno(_("could not close '%s'"), path);
+	else {
+		strbuf_reset(buffer);
+		if (launch_editor(path, buffer, env) < 0)
+			res = error_errno(_("could not edit '%s'"), path);
+		unlink(path);
+	}
+
+	free(path2);
+	return res;
+}

editor.h

@@ -0,0 +1,34 @@
+#ifndef EDITOR_H
+#define EDITOR_H
+
+struct strbuf;
+
+const char *git_editor(void);
+const char *git_sequence_editor(void);
+int is_terminal_dumb(void);
+
+/**
+ * Launch the user preferred editor to edit a file and fill the buffer
+ * with the file's contents upon the user completing their editing. The
+ * third argument can be used to set the environment which the editor is
+ * run in. If the buffer is NULL the editor is launched as usual but the
+ * file's contents are not read into the buffer upon completion.
+ */
+int launch_editor(const char *path, struct strbuf *buffer,
+		  const char *const *env);
+
+int launch_sequence_editor(const char *path, struct strbuf *buffer,
+			   const char *const *env);
+
+/*
+ * In contrast to `launch_editor()`, this function writes out the contents
+ * of the specified file first, then clears the `buffer`, then launches
+ * the editor and reads back in the file contents into the `buffer`.
+ * Finally, it deletes the temporary file.
+ *
+ * If `path` is relative, it refers to a file in the `.git` directory.
+ */
+int strbuf_edit_interactively(struct strbuf *buffer, const char *path,
+			      const char *const *env);
+
+#endif

pager.c

@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "config.h"
+#include "editor.h"
 #include "run-command.h"
 #include "sigchain.h"
 #include "alias.h"

rebase-interactive.c

@@ -1,5 +1,6 @@
 #include "git-compat-util.h"
 #include "commit.h"
+#include "editor.h"
 #include "environment.h"
 #include "gettext.h"
 #include "sequencer.h"

sideband.c

@@ -1,6 +1,7 @@
 #include "cache.h"
 #include "color.h"
 #include "config.h"
+#include "editor.h"
 #include "gettext.h"
 #include "sideband.h"
 #include "help.h"

strbuf.c

@@ -1180,34 +1180,6 @@ int strbuf_normalize_path(struct strbuf *src)
 	return 0;
 }
 
-int strbuf_edit_interactively(struct strbuf *buffer, const char *path,
-			      const char *const *env)
-{
-	char *path2 = NULL;
-	int fd, res = 0;
-
-	if (!is_absolute_path(path))
-		path = path2 = xstrdup(git_path("%s", path));
-
-	fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
-	if (fd < 0)
-		res = error_errno(_("could not open '%s' for writing"), path);
-	else if (write_in_full(fd, buffer->buf, buffer->len) < 0) {
-		res = error_errno(_("could not write to '%s'"), path);
-		close(fd);
-	} else if (close(fd) < 0)
-		res = error_errno(_("could not close '%s'"), path);
-	else {
-		strbuf_reset(buffer);
-		if (launch_editor(path, buffer, env) < 0)
-			res = error_errno(_("could not edit '%s'"), path);
-		unlink(path);
-	}
-
-	free(path2);
-	return res;
-}
-
 void strbuf_strip_file_from_path(struct strbuf *sb)
 {
 	char *path_sep = find_last_dir_sep(sb->buf);

strbuf.h

@@ -640,30 +640,6 @@ void strbuf_repo_add_unique_abbrev(struct strbuf *sb, struct repository *repo,
 void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 			      int abbrev_len);
 
-/**
- * Launch the user preferred editor to edit a file and fill the buffer
- * with the file's contents upon the user completing their editing. The
- * third argument can be used to set the environment which the editor is
- * run in. If the buffer is NULL the editor is launched as usual but the
- * file's contents are not read into the buffer upon completion.
- */
-int launch_editor(const char *path, struct strbuf *buffer,
-		  const char *const *env);
-
-int launch_sequence_editor(const char *path, struct strbuf *buffer,
-			   const char *const *env);
-
-/*
- * In contrast to `launch_editor()`, this function writes out the contents
- * of the specified file first, then clears the `buffer`, then launches
- * the editor and reads back in the file contents into the `buffer`.
- * Finally, it deletes the temporary file.
- *
- * If `path` is relative, it refers to a file in the `.git` directory.
- */
-int strbuf_edit_interactively(struct strbuf *buffer, const char *path,
-			      const char *const *env);
-
 /*
  * Remove the filename from the provided path string. If the path
  * contains a trailing separator, then the path is considered a directory