Help-commands filtering and Member-prefix-search (#182)

3 files changed, 40 insertions, 19 deletions

diff --git a/src/framework/standard/help_commands.rs b/src/framework/standard/help_commands.rs
index 42527d0..9bae941 100644
--- a/src/framework/standard/help_commands.rs
+++ b/src/framework/standard/help_commands.rs
@@ -31,6 +31,7 @@ use super::{Args, Command, CommandGroup, CommandOrAlias, CommandError};
 use client::Context;
 use model::{ChannelId, Guild, Member, Message};
 use utils::Colour;
+use framework::standard::{has_correct_roles, has_correct_permissions};
 
 fn error_embed(channel_id: &ChannelId, input: &str) {
     let _ = channel_id.send_message(|m| {
@@ -50,14 +51,13 @@ fn remove_aliases(cmds: &HashMap<String, CommandOrAlias>) -> HashMap<&String, &I
     result
 }
 
-fn right_roles(cmd: &Command, guild: &Guild, member: &Member) -> bool {
+/// Checks whether a user is member of required roles 
+/// and given the required permissions.
+fn has_all_requirements(cmd: &Command, guild: &Guild, member: &Member, msg: &Message) -> bool {
     if cmd.allowed_roles.is_empty() {
-        true
+        has_correct_permissions(cmd, msg)
     } else {
-        cmd.allowed_roles
-            .iter()
-            .flat_map(|r| guild.role_by_name(r))
-            .any(|g| member.roles.contains(&g.id))
+        has_correct_roles(cmd, guild, member) && has_correct_permissions(cmd, msg)
     }
 }
 
@@ -106,7 +106,7 @@ pub fn with_embeds(_: &mut Context,
                                     if let Some(member) = guild.members.get(&msg.author.id) {
                                         if let Ok(permissions) = member.permissions() {
                                             if !permissions.administrator() &&
-                                               !right_roles(cmd, &guild, member) {
+                                               !has_all_requirements(cmd, &guild, member, &msg) {
                                                 break;
                                             }
                                         }
@@ -213,7 +213,7 @@ pub fn with_embeds(_: &mut Context,
                             if let Some(member) = guild.members.get(&msg.author.id) {
                                 if let Ok(permissions) = member.permissions() {
                                     if cmd.help_available &&
-                                       (right_roles(cmd, &guild, member) ||
+                                       (has_all_requirements(cmd, &guild, member, &msg) ||
                                         permissions.administrator()) {
                                         let _ = write!(desc, "`{}`\n", name);
                                         has_commands = true;
@@ -279,7 +279,7 @@ pub fn plain(_: &mut Context,
                                     if let Some(member) = guild.members.get(&msg.author.id) {
                                         if let Ok(permissions) = member.permissions() {
                                             if !permissions.administrator() &&
-                                               !right_roles(cmd, &guild, member) {
+                                               !has_all_requirements(cmd, &guild, member, &msg) {
                                                 break;
                                             }
                                         }
@@ -366,7 +366,7 @@ pub fn plain(_: &mut Context,
                 if let Some(member) = guild.members.get(&msg.author.id) {
                     if let Ok(permissions) = member.permissions() {
                         if cmd.help_available &&
-                           (permissions.administrator() || right_roles(cmd, &guild, member)) {
+                           (permissions.administrator() || has_all_requirements(cmd, &guild, member, &msg)) {
                             let _ = write!(group_help, "`{}` ", name);
                         }
                     }
diff --git a/src/framework/standard/mod.rs b/src/framework/standard/mod.rs
index 601c118..7156186 100644
--- a/src/framework/standard/mod.rs
+++ b/src/framework/standard/mod.rs
@@ -22,7 +22,7 @@ use std::default::Default;
 use std::sync::Arc;
 use client::Context;
 use super::Framework;
-use model::{ChannelId, GuildId, Message, UserId};
+use model::{ChannelId, GuildId, Guild, Member, Message, UserId};
 use model::permissions::Permissions;
 use internal::RwLockExt;
 
@@ -514,12 +514,7 @@ impl StandardFramework {
                         if let Some(member) = guild.members.get(&message.author.id) {
                             if let Ok(permissions) = member.permissions() {
                                 if !permissions.administrator() {
-                                    let right_role = command
-                                        .allowed_roles
-                                        .iter()
-                                        .flat_map(|r| guild.role_by_name(r))
-                                        .any(|g| member.roles.contains(&g.id));
-                                    if !right_role {
+                                    if !has_correct_roles(&command, &guild, &member) {
                                         return Some(DispatchError::LackingRole);
                                     }
                                 }
@@ -947,7 +942,7 @@ impl Framework for StandardFramework {
 }
 
 #[cfg(feature = "cache")]
-pub(crate) fn has_correct_permissions(command: &Arc<Command>, message: &Message) -> bool {
+pub(crate) fn has_correct_permissions(command: &Command, message: &Message) -> bool {
     if !command.required_permissions.is_empty() {
         if let Some(guild) = message.guild() {
             let perms = guild
@@ -958,4 +953,12 @@ pub(crate) fn has_correct_permissions(command: &Arc<Command>, message: &Message)
     }
 
     true
-}
\ No newline at end of file
+}
+
+#[cfg(feature = "cache")]
+pub(crate) fn has_correct_roles(cmd: &Command, guild: &Guild, member: &Member) -> bool {
+    cmd.allowed_roles
+            .iter()
+            .flat_map(|r| guild.role_by_name(r))
+            .any(|g| member.roles.contains(&g.id))
+}
diff --git a/src/model/guild/mod.rs b/src/model/guild/mod.rs
index 8173a04..e6023cb 100644
--- a/src/model/guild/mod.rs
+++ b/src/model/guild/mod.rs
@@ -741,6 +741,24 @@ impl Guild {
             })
     }
 
+    /// Retrieves all [`Member`] that start with a given `String`.
+    ///
+    /// If the prefix is "zey", following results are possible:
+    /// - "zey", "zeyla", "zey mei"
+    /// But the following are not because case-sensitivity:
+    /// - "Zey", "ZEYla", "zeY mei"
+    /// 
+    /// [`Member`]: struct.Member.html
+    pub fn members_starting_with(&self, prefix: &str) -> Vec<&Member> {
+        self.members
+            .values()
+            .filter(|member|
+                member.user.read().unwrap().name.starts_with(prefix)
+                || member.nick.as_ref()
+                    .map_or(false, |nick|
+                        nick.starts_with(prefix))).collect()
+    }
+
     /// Moves a member to a specific voice channel.
     ///
     /// Requires the [Move Members] permission.