Implement program wall

Cargo.toml

@@ -47,6 +47,7 @@ feat_common_core = [
   "setpgid",
   "setsid",
   "uuidgen",
+  "wall",
 ]
 
 [workspace.dependencies]
@@ -75,6 +76,7 @@ sysinfo = "0.38"
 tempfile = "3.9.0"
 textwrap = { version = "0.16.0", features = ["terminal_size"] }
 thiserror = "2.0"
+unicode-width = { version = "0.2.2", default-features = false }
 uucore = "0.2.2"
 uuid = { version = "1.16.0", features = ["rng-rand"] }
 uutests = "0.6.0"
@@ -86,10 +88,10 @@ clap = { workspace = true }
 clap_complete = { workspace = true }
 clap_mangen = { workspace = true }
 dns-lookup = { workspace = true }
-parse_datetime = {workspace = true}
+parse_datetime = { workspace = true }
 phf = { workspace = true }
 serde = { workspace = true }
-serde_json  = { workspace = true }
+serde_json = { workspace = true }
 textwrap = { workspace = true }
 uucore = { workspace = true }
 
@@ -113,13 +115,16 @@ nologin = { optional = true, version = "0.0.1", package = "uu_nologin", path = "
 renice = { optional = true, version = "0.0.1", package = "uu_renice", path = "src/uu/renice" }
 rev = { optional = true, version = "0.0.1", package = "uu_rev", path = "src/uu/rev" }
 setpgid = { optional = true, version = "0.0.1", package = "uu_setpgid", path = "src/uu/setpgid" }
-setsid = { optional = true, version = "0.0.1", package = "uu_setsid", path ="src/uu/setsid" }
-uuidgen = { optional = true, version = "0.0.1", package = "uu_uuidgen", path ="src/uu/uuidgen" }
+setsid = { optional = true, version = "0.0.1", package = "uu_setsid", path = "src/uu/setsid" }
+uuidgen = { optional = true, version = "0.0.1", package = "uu_uuidgen", path = "src/uu/uuidgen" }
+wall = { optional = true, version = "0.0.1", package = "uu_wall", path = "src/uu/wall" }
 
 [dev-dependencies]
 ctor = "0.6.0"
 # dmesg test require fixed-boot-time feature turned on.
-dmesg = { version = "0.0.1", package = "uu_dmesg", path = "src/uu/dmesg", features = ["fixed-boot-time"] }
+dmesg = { version = "0.0.1", package = "uu_dmesg", path = "src/uu/dmesg", features = [
+  "fixed-boot-time",
+] }
 libc = { workspace = true }
 pretty_assertions = "1"
 rand = { workspace = true }

README.md

@@ -14,6 +14,7 @@ We are rewriting [these tools](https://github.com/util-linux/util-linux) in Rust
 First, reimplement the most important tools from util-linux:
 
 ## System Information
+
 - `dmesg`: Displays kernel messages.
 - `lscpu`: Shows CPU architecture information.
   Started
@@ -23,13 +24,15 @@ First, reimplement the most important tools from util-linux:
 - `lsns`: Lists namespaces.
 
 ## Hardware Management
+
 - `chcpu`: Manages CPU state.
 - `rtcwake`: Manages system sleep states.
 - `zramctl`: Manages zram devices.
 - `wdctl`: Shows watchdog status.
 - `chmem`: Manages kernel memory usage.
 
 ## Filesystem Tools
+
 - `findmnt`: Lists mounted filesystems.
 - `mountpoint`: Checks if a directory is a mountpoint.
   Started
@@ -40,6 +43,7 @@ First, reimplement the most important tools from util-linux:
 - `wipefs`: Wipes filesystem signatures.
 
 ## Partition Management
+
 - `blkdiscard`: Discards sectors on a device.
 - `blkid`: Identifies block device attributes.
 - `blkzone`: Manages zoned block device parameters.
@@ -52,6 +56,7 @@ First, reimplement the most important tools from util-linux:
 - `resizepart`: Resizes a partition.
 
 ## Process and Resource Management
+
 - `runuser`: Runs a shell with different user/group IDs.
 - `sulogin`: Provides single-user mode login.
 - `chrt`: Manages real-time process attributes.
@@ -63,6 +68,7 @@ First, reimplement the most important tools from util-linux:
 - `uclampset`: Manages process utilization clamping.
 
 ## User and Session Management
+
 - `su`: Changes user ID or becomes superuser.
 - `agetty`: Manages TTYs for login prompts.
 - `ctrlaltdel`: Configures Ctrl-Alt-Del action.
@@ -74,14 +80,17 @@ First, reimplement the most important tools from util-linux:
 - `setsid`: Runs a program in a new session.
 - `setterm`: Sets terminal attributes.
 - `getty`: Manages virtual console login prompts.
+- `wall`: Writes a message to all logged-in users.
 
 ## Networking and IPC
+
 - `ipcmk`: Creates IPC resources.
 - `ipcrm`: Removes IPC resources.
 - `ipcs`: Shows IPC facilities status.
 - `nsenter`: Enters different namespaces.
 
 ## Utility Tools
+
 - `lsblk`: Lists block devices.
 - `fallocate`: Preallocates file space.
 - `flock`: Manages file locks.
@@ -102,7 +111,8 @@ First, reimplement the most important tools from util-linux:
 - `uuidgen`: Generate different types of UUID.
 
 Note:
-* /bin/more is already implemented in https://github.com/uutils/coreutils
+
+- /bin/more is already implemented in https://github.com/uutils/coreutils
 
 Project:
 http://www.kernel.org/pub/linux/utils/util-linux/

src/uu/wall/Cargo.toml

@@ -0,0 +1,19 @@
+[package]
+name = "uu_wall"
+version = "0.0.1"
+edition = "2021"
+description = "wall ~ Write a mesage to all users."
+
+[lib]
+path = "src/wall.rs"
+
+[[bin]]
+name = "wall"
+path = "src/main.rs"
+
+[dependencies]
+uucore = { workspace = true, features = ["process", "entries"] }
+clap = { workspace = true }
+libc = { workspace = true }
+chrono = { workspace = true }
+unicode-width = { workspace = true }

src/uu/wall/src/main.rs

@@ -0,0 +1 @@
+uucore::bin!(uu_wall);