[GH #65] Support binding more advanced external commands

NEWS

@@ -24,6 +24,9 @@ Improvements:
    Example: `bind main B !?git rebase -i %(commit)`.
  - User-defined commands prefixed with a '<' means exit after execution.
    Example: `bind main C !<git commit`. (GH #66)
+ - User-defined commands are executed unquoted to support shell commands.
+   Example: `bind generic I !@sh -c "echo -n %(commit) | xclip -selection c"`.
+   (GH #65)
  - Configure case-insensitive searches using: `set ignore-case = yes`.
  - Add "deleted mode" line type for better diff coloring.
  - Open editor when requesting edit action from within a file diff.

io.c

@@ -28,16 +28,18 @@ argv_to_string(const char *argv[SIZEOF_ARG], char *buf, size_t buflen, const cha
 }
 
 static inline int
-get_arg_valuelen(const char *arg, bool *quoted)
+get_arg_valuelen(const char *arg, char *quoted)
 {
 	if (*arg == '"' || *arg == '\'') {
 		const char *end = *arg == '"' ? "\"" : "'";
 		int valuelen = strcspn(arg + 1, end);
 
 		if (quoted)
-			*quoted = TRUE;
+			*quoted = *arg;
 		return valuelen > 0 ? valuelen + 2 : strlen(arg);
 	} else {
+		if (quoted)
+			*quoted = 0;
 		return strcspn(arg, " \t");
 	}
 }
@@ -46,7 +48,7 @@ static bool
 split_argv_string(const char *argv[SIZEOF_ARG], int *argc, char *cmd, bool remove_quotes)
 {
 	while (*cmd && *argc < SIZEOF_ARG) {
-		bool quoted = FALSE;
+		char quoted = 0;
 		int valuelen = get_arg_valuelen(cmd, &quoted);
 		bool advance = cmd[valuelen] != 0;
 		int quote_offset = !!(quoted && remove_quotes);
@@ -140,6 +142,29 @@ argv_append_array(const char ***dst_argv, const char *src_argv[])
 	return TRUE;
 }
 
+bool
+argv_remove_quotes(const char *argv[])
+{
+	int argc;
+
+	for (argc = 0; argv[argc]; argc++) {
+		char quoted = 0;
+		const char *arg = argv[argc];
+		int arglen = get_arg_valuelen(arg, &quoted);
+
+		if (!quoted)
+			continue;
+
+		arg = strndup(arg + 1, arglen - 1 - (arg[arglen - 1] == quoted));
+		if (!arg)
+			return FALSE;
+		free((void *) argv[argc]);
+		argv[argc] = arg;
+	}
+
+	return TRUE;
+}
+
 bool
 argv_copy(const char ***dst, const char *src[])
 {

io.h

@@ -29,6 +29,7 @@ size_t argv_size(const char **argv);
 bool argv_append(const char ***argv, const char *arg);
 bool argv_append_array(const char ***dst_argv, const char *src_argv[]);
 bool argv_copy(const char ***dst, const char *src[]);
+bool argv_remove_quotes(const char *argv[]);
 
 /*
  * Encoding conversion.

tig.c

@@ -3419,12 +3419,12 @@ open_run_request(enum request request)
 			}
 		}
 
-		if (!confirmed)
-			; /* Nothing */
-		else if (req->silent)
-			io_run_bg(argv);
-		else
-			open_external_viewer(argv, NULL, !req->exit);
+		if (confirmed && argv_remove_quotes(argv)) {
+			if (req->silent)
+				io_run_bg(argv);
+			else
+				open_external_viewer(argv, NULL, !req->exit);
+		}
 	}
 
 	if (argv)

tigrc.5.txt

@@ -349,10 +349,18 @@ are:
 As an example, the following external command will save the current commit as
 a patch file: "!git format-patch -1 %(commit)". If your external command
 requires use of dynamic features, such as subshells, expansion of environment
-variables and process control, this can be achieved by using a combination of
-git aliases and tig external commands. The following example entries can be
-put in either the .gitconfig or .git/config file:
+variables and process control, this can be achieved by using a shell command:
 
+.Configure a binding in ~/.tigrc to put a commit ID in the clipboard.
+--------------------------------------------------------------------------
+bind generic I !@sh -c "echo -n %(commit) | xclip -selection c"
+--------------------------------------------------------------------------
+
+Or by using a combination of git aliases and tig external commands. The
+following example entries can be put in either the .gitconfig or .git/config
+file:
+
+.Git configuration which binds tig keys to git command aliasas.
 --------------------------------------------------------------------------
 [alias]
 	gitk-bg = !"gitk HEAD --not $(git rev-parse --remotes) &"