[hackers][vis][RFC][PATCH 2/2] Add autocompletion for file names

[Silvan Jegen]

We use the new infrastructure for autocompletion to implement
autocompletion of file names within the working directory of vis.
---
 config.def.h |  1 +
 main.c       | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/config.def.h b/config.def.h
index 9e52102..5219d00 100644
--- a/config.def.h
+++ b/config.def.h
@@ -320,6 +320,7 @@ static const KeyBinding bindings_insert[] = {
        { "<C-i>",              ALIAS("<Tab>")                              },
        { "<C-j>",              ALIAS("<Enter>")                            },
        { "<C-n>",              ACTION(FILE_TEXT_AUTOCOMPLETE)              },
+       { "<C-x><C-f>",         ACTION(FILE_NAME_AUTOCOMPLETE)              },
        { "<C-m>",              ALIAS("<Enter>")                            },
        { "<C-o>",              ACTION(MODE_OPERATOR_PENDING)               },
        { "<C-r>",              ACTION(INSERT_REGISTER)                     },
diff --git a/main.c b/main.c
index 9e224d1..e5807c9 100644
--- a/main.c
+++ b/main.c
@@ -131,6 +131,8 @@ static void insert_dialog_selection(Vis*, const char 
*cmdline, ...);
 static char *get_output_of_external_command(Vis*, const char *argv[]);
 /* Autocomplete input text at cursor based on the words in the current file */
 static const char *autocomplete_file_text(Vis*, const char *keys, const Arg 
*arg);
+/* Autocomplete input text at cursor based on file names of the current 
directory */
+static const char *autocomplete_file_name(Vis*, const char *keys, const Arg 
*arg);
 
 enum {
        VIS_ACTION_EDITOR_SUSPEND,
@@ -314,6 +316,7 @@ enum {
        VIS_ACTION_OPEN_FILE_UNDER_CURSOR,
        VIS_ACTION_OPEN_FILE_UNDER_CURSOR_NEW_WINDOW,
        VIS_ACTION_FILE_TEXT_AUTOCOMPLETE,
+       VIS_ACTION_FILE_NAME_AUTOCOMPLETE,
        VIS_ACTION_NOP,
 };
 
@@ -1223,6 +1226,11 @@ static const KeyAction vis_action[] = {
                "Autocomplete text in file",
                autocomplete_file_text,
        },
+       [VIS_ACTION_FILE_NAME_AUTOCOMPLETE] = {
+               "autocomplete-file-name",
+               "Autocomplete file name",
+               autocomplete_file_name,
+       },
        [VIS_ACTION_NOP] = {
                "nop",
                "Ignore key, do nothing",
@@ -2158,6 +2166,18 @@ static char *get_prefix_for_autocomplete(Vis *vis) {
        return prefix;
 }
 
+static const char *autocomplete_file_name(Vis *vis, const char *keys, const 
Arg *arg) {
+       char *prefix = get_prefix_for_autocomplete(vis);
+       if (!prefix)
+               return keys;
+
+       // TODO: get menu/dialog program to use from config?
+       insert_dialog_selection(vis, "ls | grep \"^%s\" | sort | dmenu | tr -d 
'\n' | sed \"s/%s//\"", prefix, prefix);
+
+       free(prefix);
+       return keys;
+}
+
 static const char *autocomplete_file_text(Vis *vis, const char *keys, const 
Arg *arg) {
        Win *win = vis_window(vis);
        const char *fn = vis_window_filename(win);
-- 
2.8.2